research communications
Hirshfeld surface analysis and computational study of a rhodamine B–salicylaldehyde Schiff base derivative
aDepartment of Chemistry, Faculty of Science and Center for Advanced Studies in Nanotechnology for Chemical, Food and Agricultural Industries, KU Institute for Advanced Studies, Kasetsart University, Bangkok 10900, Thailand, bDepartment of Materials Engineering, Faculty of Engineering, Kasetsart University 10900, Thailand, and cFaculty of Science at Si Racha, Kasetsart University Si Racha Campus, Chonburi 20230, Thailand
*Correspondence e-mail: sfsciawn@src.ku.ac.th
The molecular structure of the title compound {systematic name: 3′,6′-bis(diethylamino)-2-[(2-hydroxybenzylidene)amino]spiro[isoindoline-1,9′-xanthen]-3-one}, C35H36N4O3 or RbSa, can be seen as being composed of two parts sharing a central quaternary carbon atom. Both the xanthene and isoindole moieties are nearly planar: 14 atoms in the former moiety show an r.m.s. deviation of 0.0411 Å and eleven atoms in the latter moiety show an r.m.s. deviation of 0.0545 Å. These two planes are almost perpendicular to each other, the angle between the mean planes being 87.71 (2)°. The title compound appears to be in its enol form. The corresponding H atom was located and freely refined at a distance of 1.02 (3) Å from the O atom and 1.72 (2) Å from the N atom. The strong intramolecular hydrogen bond O—H⋯N bridging the hydroxyl group and its neighboring nitrogen atom forms an S(6) graph-set motif. Apart from the intramolecular O—H⋯N hydrogen bond, C—H⋯O interactions are observed between two neighbouring RbSa molecules related by an inversion center. The C—O donor–acceptor distance is 3.474 (2) Å. Moreover, C—H⋯π interactions are observed between the C—H bond of one of the ethyl groups and the centroid of the benzene ring of the isoindole moiety. The C⋯centroid distance is 3.8191 (15) Å. No π–π interactions are observed in the as the shortest distance between ring centroids is more than 4 Å. A Hirshfeld surface analysis of the indicates that the most important contributions for the crystal packing are from H⋯H, C⋯H/H⋯C, O⋯H/H⋯O and N⋯H/H⋯N interactions. DFT calculations at the CAM-B3LYP/6–31 G(d) level were carried out to gain a better understanding of the relative energies and the process between two possible conformers (keto and enol), as well as the transition state of the title compound.
CCDC reference: 2006371
1. Chemical context
Rhodamine B derivatives are employed extensively as molecular probes in the study of complex biological systems because of their high absorption coefficients, high fluorescence quantum yields and long-wavelength absorptions and emissions (Bao et al., 2013; Biswal & Bag, 2013). On the basis of the spirolactam/ring-opened amide equilibrium of rhodamine, several fluorescence-based sensing systems for metal ions have been developed. Most of the reported sensors based on rhodamine B derivatives are fluorescent chemosensors for metal ion detection (Quang & Kim, 2010; Kim et al., 2008; Kwon et al., 2005; Liu et al., 2013; Ni et al., 2013). A rhodamine B derivative is usually used as a chemosensor because of its good photophysical properties, sensitivity, the low cost of chemical reagents and the ease of modifying its structure. Rhodamine B derivatives have naked-eye detection and show off–on fluorescent property when reacting with metal ions.
2. Structural commentary
Fig. 1 shows the molecular structure of the title compound (rhodamine B – salicylaldehyde derivative, RbSa) together with the atomic labelling scheme. The title compound crystallizes in the monoclinic P21/c, and the contains a single molecule in a general position. The molecule can be seen as having two distinct parts sharing a central quaternary carbon atom. The atoms in the xanthene moiety, namely C5–C10, O1, C11–C17, are almost coplanar, as seen from the r.m.s. deviation of 0.0411 Å (Fig. 2a). The atoms C11, C22–C28, O2, N3 and N4 of the isoindole unit are also nearly coplanar with an r.m.s. deviation of 0.0545 Å (Fig. 2b). These two planes are almost perpendicular to each other, the dihedral angle between their mean planes being 87.71 (2)° (Fig. 2c). The four ethyl groups present in the molecule point out of the xanthene plane and are on the same side of the plane; the corresponding out-of-plane torsion angles C16—N2—C19—C18, C16—N2—C21—C20, C5—N1—C2—C1 and C5—N1—C4—C3 are 73.76 (15), −79.52 (15), −86.26 (15) and 65.09 (16)°, respectively.
The major tautomer of the rhodamine B – salicylaldehyde Schiff-base derivative is usually the enol form for compounds having hydroxy and azamethylene groups attached to the benzene ring in the ortho positions (Veranitisagul et al., 2012; Wattanathana et al., 2012, 2016). Similarly, our title compound appears to be in its enol form. The corresponding H atom was located and freely refined at a distance of 1.02 (3) Å from the O atom and 1.72 (2) Å from the N atom (Table 1, Fig. 3). The strong intramolecular O—H⋯N hydrogen bond bridging the hydroxyl group and its neighbouring nitrogen atom forms an S(6) graph-set motif involving atoms N4, H3, O3, C35, C30 and C29 and stabilizes a rigid configuration that can partially inhibit the rotation of the phenyl ring about the N—N bond.
3. Supramolecular features
Besides the intramolecular O—H⋯N hydrogen bond, the title molecules form C31–H31⋯O3i interactions [symmetry code: (i) x, −y + , z − ] between two neighbouring RbSa molecules related by an inversion center (Fig. 4). The C31⋯O3i donor-acceptor distance is 3.474 (2) Å. Moreover, C—H⋯π interactions are observed between C18—H18A and the benzene ring (C22–C27) of the isoindole unit (Fig. 5). Within the the RbSa molecules aggregate into infinite molecular chains in an end-to-end packing mode along the [100] direction. No π–π interactions are observed in the as the shortest distance between ring centroids is greater than 4 Å.
4. Hirshfeld surface analysis
The intermolecular interactions in the crystal of the title compound were investigated and visualized by performing a Hirshfeld surface (HS) analysis (Hirshfeld, 1977; Spackman & Jayatilaka, 2009) using Crystal Explorer 17.5 software (Turner et al., 2017). The HS plotted over dnorm in the range −0.1732 to 1.4064 a.u. is shown in Fig. 6. Fig. 7 shows the full two-dimensional fingerprint plot (McKinnon et al., 2007) and those delineated into the major contacts: H⋯H (61.5%), H⋯C/C⋯H (20.3%), H⋯O/O⋯H (11.7%), and H⋯N/N⋯H (1.9%) for which de + di ∼2.0, 3.0, 2.8 and 3.4 Å, respectively. The other contacts are negligible with individual contributions of less than 1% and a sum of less than 5%.
5. Database survey
A search of the Cambridge Structural Database (CSD version 5.41, November 2019 + one update; Groom et al., 2016) shows that the crystal structures of many compounds having rhodamine B as a core have been reported. The structural diversity of rhodamine B derivatives results from the fact that the different functional groups in the molecules can be tuned. For example, the carboxylic can be converted to ester functional groups such as methyl ester derivatives (I) (ROKNOU; Fun et al., 1997) and (II) (QIMMII; Adhikesavalu et al., 2001), ethyl ester derivatives (III) (QIMMEE; Adhikesavalu et al., 2001) and cyclic (IV) (FUFTIJ; Kvick et al., 2000). In our case, the carboxylic acid is sequentially transformed into a cyclic lactam with a hydrazone side chain. The counter-anions are the other key factor in the crystal structures of rhodamine B derivatives. Mizuguchi (2008) reported the of the ethyl gallate salt at 93 K (PIHJIA01), and Venkatraman et al. (2008) published a new derivative with the hexachloridostannate(IV) anion, RISQIU. Moreover, rhodamine B derivatives can be used as a ligand for many metal cations to form coordination complexes such as the cadmium complex (V) (IKISUQ; Qu et al., 2001).
6. Synthesis and crystallization
The reagents were purchased from commercial suppliers and used without further purification: rhodamine B (Fluka Chemicals), hydrazine hydrate (Across Organics), salicyaldehyde (Sigma–Aldrich), hydrochloric acid (Valchem), ammonium hydroxide (Mallinckrodt Chemicals) and sodium hydroxide (RCI Labscan). Solvents including absolute ethanol (EtOH), methanol (MeOH) and chloroform were purchased from RCI Labscan and Merck. 1H NMR spectra were measured on a Varian INOVA 400 spectrometer at 400 MHz in CDCl3. The FTIR spectrum was obtained using a Bruker Tensor 27 spectrometer, while the was recorded on a Bruker microTOF-Q III. The melting point of the obtained sample was measured by a Stuart Scientific melting-point analyser (SMP10).
Fig. 8 shows the chemical structures of the starting materials and intermediate and the synthetic route of the rhodamine–Schiff-base derivative studied in this work (RbSa). Firstly, the RbH intermediate compound was synthesized from the reaction between rhodamine B and hydrazine hydrate. Rhodamine B (1.20 g, 2.50 mmol) was dissolved in ethanol. An equimolar amount of hydrazine hydrate (2.0 ml, 2.5 mmol) was added to this solution. The mixture was then refluxed at 373 K under N2 for 2 h. During the reaction, the colour of the solution changed from dark purple to light orange. After the reaction was complete, a precipitate of RbH was obtained by solvent evaporation, and then 1 M HCl was added to re-dissolve the crude product to obtain a clear red solution. After that, 1 M NaOH was added slowly in order to precipitate the purer RbH compound out. The obtained RbH was filtered under reduced pressure. The title compound RbSa was then prepared from the reaction of the filtered RbH (0.48 g, 0.97 mmol) and salicylaldehyde (0.12 ml, 1 mmol) in ethanolic solution. A pink precipitate of RbSa formed after reflux at 353 K for 12 h under an N2 atmosphere. The RbSa precipitate was separated by vacuum filtration and washed three times with cold ethanol. After recrystallization from chloroform and methanol mixed solvents with a volume ratio of 1:1, light-violet single crystals were obtained after several days, m.p. 495 K.
HR–MS (ESI–TOF) m/z: [M + 1]+ calculated from C35H37N4O3 is 561.286017; found 561.288140.
1H NMR (400 MHz, CDCl3) chemical shifts (δ): 9.31 (s, 1H), 8.10–7.90 (m, 1H), 7.56 (s, 2H), 7.18 (dq, J = 7.2, 4.3, 3.9 Hz, 2H), 7.13 (d, J = 7.8 Hz, 1H), 6.81 (q, J = 7.9, 7.5 Hz, 3H), 6.41 (d, J = 87.7 Hz, 5H), 3.33 (s, 8H), 1.18 (s, 12H).
7. Computational details
All reported calculations (geometry optimizations, vibrational frequencies, and relative energies) were performed using Gaussian09 (Frisch et al., 2009) using density functional theory (DFT) at the CAM-B3LYP/6–31 G(d) level. The ground-state geometries of the RbSa molecules with different conformers were optimized, and vibrational frequency calculations were performed to confirm that the optimized structures correspond well to a local minimum or a transition state. The hybrid exchange-correlation functional CAM-B3LYP was selected because it has been found to be a method of choice in important reported studies (Klinhom et al., 2019; Miengmern et al., 2019), showing a good compromise between computational time and the accuracy of the results. All calculations were carried out in ethanol using a conductor-like polarizable continuum model (CPCM) (Scalmani et al., 2006).
8. Quantum chemical calculations
For a more in-depth insight into the molecular structures of RbSa, density functional theory (DFT) calculations at the CAM-B3LYP/6-311 G(d,p) level were carried out. They were mainly applied to investigate the intramolecular proton-transfer reaction during the enol–keto .
mechanism. The molecular structures of two essential conformers (the enol and keto forms) of the title compound were first obtained by geometry optimizations without any constraints. Starting from the enol form and going to the keto form, the curve (PEC) was explored by elongating the O—H bond in steps of 0.1 Å (from 1.0 to 1.8 Å). The CAM-B3LYP optimized conformers and their relative energies are depicted in Fig. 9The enol form is the most stable conformer (O—H = 0.98 Å) with the lowest relative energy, and the keto form (O—H = 1.76 Å) is found to be slightly higher in energy than the enol form by 9.1 kcal mol−1. All along the path, the six atoms involved in the initial S(6) graph-set motif remain coplanar, but a rotation occurs around the N—N bond between the diaminoxanthene and the salicylidene aniline moieties, which move from being coplanar in the enol form to being nearly perpendicular in the keto-form (Fig. 9). The rotation of the N—N bond gives rise to the elongation and then the breakage of the O—H bond in the enol form, resulting in the formation of the N—H bond (keto form). Although the enol–keto involves breakage of the O—H bond, the intramolecular hydrogen-bonded S(6) ring still remains even in the keto form, involving the same atoms in the synthon as in the enol form. According to the relative energy calculations, it can be concluded that the phenolic –OH group can form a stronger intramolecular hydrogen-bonding interaction (enol form) with the N atom of the diaminoxanthene moiety than with the –NH group of the phenolate O in the keto closed form. The result is in a good agreement with the X-ray in that the enol form is the dominant conformer.
Based on the highest energy structure obtained on the PEC, we optimized the molecular geometry of the transition state of the keto–enol −1 higher in energy than the enol form and only 1.3 kcal mol−1 above that of the keto form (Fig. 9). The optimized structure reveals an O—H distance of 1.30 Å, in between the O—H distances observed in the enol and keto conformers, but closer to that of the enol-conformer. The energy curve is rather flat between the transition state and the keto form, despite a difference of about 0.5 Å between the O—H distances (1.30 and 1.76 Å, respectively). Besides the fact that the enol form exhibits the lowest absolute energy and is the most stable conformer, that flatness also explains why the keto form is not as stable and can easily return to the enol form in solution under normal conditions.
pathway without constraints. The single negative (imaginary) vibrational frequency calculated for the obtained structure showed that the transition state was correctly determined. The transition state lies 10.4 kcal mol9. Refinement
Crystal data, data collection and structure . The O-bound H atom (H3) was located in a difference-Fourier map and freely refined. The other hydrogen atoms were refined using a riding model with d(C—H) = 0.95 Å and Uiso(H) = 1.2Ueq(C) for aromatic hydrogen atoms, with d(C—H) = 0.99 Å and Uiso(H) = 1.2Ueq(C) for –CH2– hydrogen atoms and d(C–H) = 0.98 Å, Uiso(H) = 1.5Ueq(C) for the terminal methyl hydrogen atoms.
details are summarized in Table 2Supporting information
CCDC reference: 2006371
https://doi.org/10.1107/S2056989020007197/zq2251sup1.cif
contains datablock I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989020007197/zq2251Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S2056989020007197/zq2251Isup3.cml
Data collection: APEX3 (Bruker, 2018); cell
SAINT (Bruker, 2018); data reduction: SAINT (Bruker, 2018); program(s) used to solve structure: SHELXT (Sheldrick, 2015a); program(s) used to refine structure: SHELXL (Sheldrick, 2015b); molecular graphics: OLEX2 (Dolomanov et al., 2009), Mercury (Macrae et al., 2020); software used to prepare material for publication: OLEX2 (Dolomanov et al., 2009).C35H36N4O3 | F(000) = 1192 |
Mr = 560.68 | Dx = 1.306 Mg m−3 |
Monoclinic, P21/c | Cu Kα radiation, λ = 1.54178 Å |
a = 9.3903 (7) Å | Cell parameters from 9681 reflections |
b = 26.8178 (19) Å | θ = 3.9–72.1° |
c = 11.5639 (8) Å | µ = 0.67 mm−1 |
β = 101.635 (2)° | T = 100 K |
V = 2852.3 (4) Å3 | Block, clear light violet |
Z = 4 | 0.20 × 0.20 × 0.20 mm |
Bruker APEXIII CCD diffractometer | 5462 reflections with I > 2σ(I) |
φ and ω scans | Rint = 0.030 |
Absorption correction: multi-scan (SADABS; Bruker, 2016) | θmax = 72.2°, θmin = 5.1° |
Tmin = 0.673, Tmax = 0.754 | h = −11→11 |
64500 measured reflections | k = −33→31 |
5508 independent reflections | l = −14→14 |
Refinement on F2 | Primary atom site location: dual |
Least-squares matrix: full | Hydrogen site location: mixed |
R[F2 > 2σ(F2)] = 0.042 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.099 | w = 1/[σ2(Fo2) + (0.0366P)2 + 1.6105P] where P = (Fo2 + 2Fc2)/3 |
S = 1.07 | (Δ/σ)max = 0.001 |
5508 reflections | Δρmax = 0.26 e Å−3 |
387 parameters | Δρmin = −0.25 e Å−3 |
0 restraints |
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes. |
x | y | z | Uiso*/Ueq | ||
O1 | 0.63421 (9) | 0.53998 (3) | 0.51482 (7) | 0.01990 (19) | |
O2 | 0.35333 (10) | 0.71057 (3) | 0.15605 (8) | 0.0258 (2) | |
O3 | 0.85258 (11) | 0.67163 (4) | 0.47128 (9) | 0.0341 (2) | |
N3 | 0.47258 (11) | 0.64737 (4) | 0.27590 (9) | 0.0182 (2) | |
N2 | 0.78424 (11) | 0.43998 (4) | 0.22361 (9) | 0.0203 (2) | |
N4 | 0.61281 (11) | 0.66475 (4) | 0.30950 (9) | 0.0197 (2) | |
N1 | 0.54337 (12) | 0.63079 (4) | 0.84325 (9) | 0.0228 (2) | |
C27 | 0.22734 (13) | 0.63956 (4) | 0.22148 (10) | 0.0181 (2) | |
C12 | 0.52489 (12) | 0.55798 (4) | 0.31027 (10) | 0.0163 (2) | |
C9 | 0.56210 (12) | 0.58015 (4) | 0.55053 (10) | 0.0167 (2) | |
C22 | 0.27539 (12) | 0.59856 (4) | 0.29156 (10) | 0.0165 (2) | |
C8 | 0.46927 (12) | 0.61076 (4) | 0.47253 (10) | 0.0165 (2) | |
C13 | 0.61868 (12) | 0.53104 (4) | 0.39588 (10) | 0.0163 (2) | |
C17 | 0.70486 (13) | 0.49250 (4) | 0.36853 (10) | 0.0174 (2) | |
H17 | 0.767903 | 0.475358 | 0.430372 | 0.021* | |
C28 | 0.35267 (13) | 0.67139 (4) | 0.21032 (10) | 0.0185 (2) | |
C16 | 0.70031 (12) | 0.47851 (4) | 0.25124 (10) | 0.0173 (2) | |
C10 | 0.58838 (13) | 0.58696 (5) | 0.67180 (10) | 0.0188 (2) | |
H10 | 0.652938 | 0.565077 | 0.721574 | 0.023* | |
C11 | 0.43818 (12) | 0.60188 (4) | 0.34033 (10) | 0.0165 (2) | |
C7 | 0.40438 (13) | 0.64983 (5) | 0.52325 (11) | 0.0199 (3) | |
H7 | 0.340634 | 0.671699 | 0.472730 | 0.024* | |
C5 | 0.52106 (13) | 0.62564 (5) | 0.72189 (11) | 0.0190 (2) | |
C6 | 0.42897 (13) | 0.65798 (5) | 0.64345 (11) | 0.0212 (3) | |
H6 | 0.383917 | 0.685408 | 0.673746 | 0.025* | |
C24 | 0.03086 (13) | 0.57033 (5) | 0.26884 (11) | 0.0219 (3) | |
H24 | −0.038019 | 0.546594 | 0.284338 | 0.026* | |
C23 | 0.17839 (13) | 0.56257 (5) | 0.31441 (10) | 0.0190 (2) | |
H23 | 0.211332 | 0.533686 | 0.359496 | 0.023* | |
C15 | 0.60465 (13) | 0.50567 (5) | 0.16302 (11) | 0.0207 (3) | |
H15 | 0.598389 | 0.497589 | 0.082170 | 0.025* | |
C26 | 0.08054 (14) | 0.64726 (5) | 0.17477 (11) | 0.0219 (3) | |
H26 | 0.048406 | 0.675417 | 0.126699 | 0.026* | |
C14 | 0.52070 (13) | 0.54367 (5) | 0.19346 (11) | 0.0203 (3) | |
H14 | 0.457022 | 0.560945 | 0.132251 | 0.024* | |
C25 | −0.01736 (13) | 0.61228 (5) | 0.20097 (11) | 0.0231 (3) | |
H25 | −0.118581 | 0.617015 | 0.172246 | 0.028* | |
C29 | 0.66197 (14) | 0.69802 (5) | 0.24752 (11) | 0.0226 (3) | |
H29 | 0.603743 | 0.709238 | 0.175314 | 0.027* | |
C21 | 0.88015 (14) | 0.41198 (5) | 0.31614 (11) | 0.0228 (3) | |
H21A | 0.901201 | 0.379277 | 0.283556 | 0.027* | |
H21B | 0.827910 | 0.405544 | 0.380933 | 0.027* | |
C30 | 0.80710 (15) | 0.71842 (5) | 0.28840 (12) | 0.0249 (3) | |
C4 | 0.67041 (14) | 0.60808 (5) | 0.91783 (11) | 0.0250 (3) | |
H4A | 0.670275 | 0.571911 | 0.900719 | 0.030* | |
H4B | 0.663083 | 0.612091 | 1.001535 | 0.030* | |
C19 | 0.78644 (15) | 0.42836 (5) | 0.10088 (11) | 0.0230 (3) | |
H19A | 0.685046 | 0.427015 | 0.055715 | 0.028* | |
H19B | 0.829533 | 0.394843 | 0.097343 | 0.028* | |
C2 | 0.46026 (14) | 0.66609 (5) | 0.89867 (11) | 0.0236 (3) | |
H2A | 0.454398 | 0.653305 | 0.977887 | 0.028* | |
H2B | 0.359964 | 0.667543 | 0.851350 | 0.028* | |
C35 | 0.89543 (15) | 0.70507 (5) | 0.39724 (13) | 0.0284 (3) | |
C3 | 0.81405 (15) | 0.63038 (6) | 0.90053 (12) | 0.0310 (3) | |
H3A | 0.820426 | 0.627884 | 0.817176 | 0.046* | |
H3B | 0.894997 | 0.612070 | 0.948926 | 0.046* | |
H3C | 0.819047 | 0.665505 | 0.924369 | 0.046* | |
C18 | 0.87120 (16) | 0.46553 (5) | 0.04151 (12) | 0.0287 (3) | |
H18A | 0.866719 | 0.455502 | −0.040637 | 0.043* | |
H18B | 0.972824 | 0.466195 | 0.083581 | 0.043* | |
H18C | 0.828601 | 0.498805 | 0.043386 | 0.043* | |
C20 | 1.02371 (15) | 0.43748 (5) | 0.36756 (13) | 0.0291 (3) | |
H20A | 1.077556 | 0.443530 | 0.304608 | 0.044* | |
H20B | 1.081375 | 0.416020 | 0.428003 | 0.044* | |
H20C | 1.004643 | 0.469316 | 0.403179 | 0.044* | |
C1 | 0.52129 (17) | 0.71867 (5) | 0.91209 (13) | 0.0319 (3) | |
H1A | 0.517760 | 0.733206 | 0.833812 | 0.048* | |
H1B | 0.622293 | 0.717668 | 0.955531 | 0.048* | |
H1C | 0.463219 | 0.739067 | 0.955591 | 0.048* | |
C31 | 0.85986 (17) | 0.75357 (5) | 0.21765 (14) | 0.0332 (3) | |
H31 | 0.800983 | 0.763165 | 0.144281 | 0.040* | |
C32 | 0.99603 (19) | 0.77443 (6) | 0.25302 (17) | 0.0412 (4) | |
H32 | 1.031113 | 0.797800 | 0.203696 | 0.049* | |
C34 | 1.03266 (16) | 0.72693 (6) | 0.43299 (16) | 0.0377 (4) | |
H34 | 1.092100 | 0.718219 | 0.506806 | 0.045* | |
C33 | 1.08133 (17) | 0.76114 (6) | 0.36078 (17) | 0.0430 (4) | |
H33 | 1.174654 | 0.775796 | 0.385279 | 0.052* | |
H3 | 0.752 (3) | 0.6591 (9) | 0.431 (2) | 0.069 (7)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0224 (4) | 0.0236 (4) | 0.0129 (4) | 0.0070 (3) | 0.0017 (3) | −0.0005 (3) |
O2 | 0.0281 (5) | 0.0213 (5) | 0.0272 (5) | 0.0023 (4) | 0.0035 (4) | 0.0077 (4) |
O3 | 0.0246 (5) | 0.0390 (6) | 0.0363 (6) | −0.0069 (4) | 0.0001 (4) | 0.0078 (4) |
N3 | 0.0162 (5) | 0.0190 (5) | 0.0188 (5) | −0.0012 (4) | 0.0022 (4) | 0.0035 (4) |
N2 | 0.0205 (5) | 0.0219 (5) | 0.0190 (5) | 0.0026 (4) | 0.0049 (4) | −0.0014 (4) |
N4 | 0.0169 (5) | 0.0197 (5) | 0.0233 (5) | −0.0016 (4) | 0.0062 (4) | −0.0019 (4) |
N1 | 0.0207 (5) | 0.0305 (6) | 0.0171 (5) | 0.0025 (4) | 0.0034 (4) | −0.0042 (4) |
C27 | 0.0193 (6) | 0.0197 (6) | 0.0148 (5) | 0.0016 (5) | 0.0025 (4) | −0.0018 (4) |
C12 | 0.0140 (5) | 0.0188 (6) | 0.0162 (5) | −0.0012 (4) | 0.0028 (4) | 0.0014 (4) |
C9 | 0.0137 (5) | 0.0185 (6) | 0.0180 (6) | −0.0007 (4) | 0.0036 (4) | −0.0005 (4) |
C22 | 0.0154 (6) | 0.0204 (6) | 0.0134 (5) | 0.0012 (4) | 0.0023 (4) | −0.0022 (4) |
C8 | 0.0134 (5) | 0.0195 (6) | 0.0164 (6) | −0.0024 (4) | 0.0024 (4) | 0.0003 (4) |
C13 | 0.0154 (5) | 0.0200 (6) | 0.0134 (5) | −0.0023 (4) | 0.0030 (4) | 0.0003 (4) |
C17 | 0.0155 (5) | 0.0206 (6) | 0.0157 (5) | 0.0006 (4) | 0.0020 (4) | 0.0026 (4) |
C28 | 0.0211 (6) | 0.0188 (6) | 0.0155 (5) | 0.0021 (5) | 0.0031 (4) | −0.0002 (4) |
C16 | 0.0152 (5) | 0.0185 (6) | 0.0190 (6) | −0.0023 (4) | 0.0053 (4) | −0.0004 (4) |
C10 | 0.0162 (5) | 0.0230 (6) | 0.0164 (6) | 0.0005 (5) | 0.0014 (4) | 0.0006 (5) |
C11 | 0.0151 (5) | 0.0177 (6) | 0.0163 (6) | −0.0009 (4) | 0.0022 (4) | 0.0028 (4) |
C7 | 0.0173 (6) | 0.0210 (6) | 0.0206 (6) | 0.0011 (5) | 0.0017 (5) | 0.0008 (5) |
C5 | 0.0152 (5) | 0.0238 (6) | 0.0178 (6) | −0.0035 (5) | 0.0030 (4) | −0.0027 (5) |
C6 | 0.0187 (6) | 0.0220 (6) | 0.0230 (6) | 0.0005 (5) | 0.0049 (5) | −0.0042 (5) |
C24 | 0.0182 (6) | 0.0286 (7) | 0.0190 (6) | −0.0046 (5) | 0.0043 (5) | −0.0040 (5) |
C23 | 0.0190 (6) | 0.0223 (6) | 0.0155 (5) | −0.0009 (5) | 0.0031 (4) | 0.0000 (4) |
C15 | 0.0204 (6) | 0.0270 (6) | 0.0146 (6) | 0.0005 (5) | 0.0030 (5) | −0.0011 (5) |
C26 | 0.0207 (6) | 0.0237 (6) | 0.0193 (6) | 0.0055 (5) | −0.0010 (5) | −0.0020 (5) |
C14 | 0.0184 (6) | 0.0260 (6) | 0.0152 (6) | 0.0022 (5) | 0.0004 (4) | 0.0030 (5) |
C25 | 0.0154 (6) | 0.0310 (7) | 0.0211 (6) | 0.0033 (5) | −0.0005 (5) | −0.0059 (5) |
C29 | 0.0251 (6) | 0.0210 (6) | 0.0233 (6) | 0.0005 (5) | 0.0089 (5) | 0.0002 (5) |
C21 | 0.0251 (6) | 0.0182 (6) | 0.0251 (6) | 0.0039 (5) | 0.0051 (5) | 0.0008 (5) |
C30 | 0.0247 (6) | 0.0198 (6) | 0.0337 (7) | −0.0014 (5) | 0.0140 (5) | −0.0049 (5) |
C4 | 0.0279 (7) | 0.0312 (7) | 0.0150 (6) | 0.0024 (5) | 0.0024 (5) | −0.0011 (5) |
C19 | 0.0266 (6) | 0.0218 (6) | 0.0216 (6) | 0.0006 (5) | 0.0070 (5) | −0.0046 (5) |
C2 | 0.0243 (6) | 0.0268 (7) | 0.0209 (6) | −0.0003 (5) | 0.0077 (5) | −0.0025 (5) |
C35 | 0.0245 (7) | 0.0244 (7) | 0.0389 (8) | −0.0034 (5) | 0.0127 (6) | −0.0033 (6) |
C3 | 0.0224 (7) | 0.0430 (8) | 0.0256 (7) | 0.0025 (6) | 0.0001 (5) | −0.0057 (6) |
C18 | 0.0343 (7) | 0.0289 (7) | 0.0266 (7) | 0.0014 (6) | 0.0148 (6) | −0.0016 (5) |
C20 | 0.0221 (7) | 0.0307 (7) | 0.0331 (7) | 0.0046 (5) | 0.0025 (5) | 0.0019 (6) |
C1 | 0.0384 (8) | 0.0276 (7) | 0.0301 (7) | −0.0034 (6) | 0.0077 (6) | −0.0012 (6) |
C31 | 0.0397 (8) | 0.0232 (7) | 0.0420 (8) | −0.0045 (6) | 0.0206 (7) | −0.0024 (6) |
C32 | 0.0438 (9) | 0.0266 (7) | 0.0615 (11) | −0.0123 (7) | 0.0304 (8) | −0.0067 (7) |
C34 | 0.0244 (7) | 0.0379 (8) | 0.0513 (9) | −0.0051 (6) | 0.0086 (6) | −0.0074 (7) |
C33 | 0.0283 (8) | 0.0346 (8) | 0.0708 (12) | −0.0142 (6) | 0.0214 (8) | −0.0154 (8) |
O1—C9 | 1.3792 (14) | C15—C14 | 1.3768 (18) |
O1—C13 | 1.3747 (14) | C26—H26 | 0.9500 |
O2—C28 | 1.2246 (15) | C26—C25 | 1.3890 (19) |
O3—C35 | 1.3558 (17) | C14—H14 | 0.9500 |
O3—H3 | 1.02 (3) | C25—H25 | 0.9500 |
N3—N4 | 1.3769 (14) | C29—H29 | 0.9500 |
N3—C28 | 1.3833 (15) | C29—C30 | 1.4561 (19) |
N3—C11 | 1.4982 (14) | C21—H21A | 0.9900 |
N2—C16 | 1.3758 (16) | C21—H21B | 0.9900 |
N2—C21 | 1.4599 (16) | C21—C20 | 1.5216 (19) |
N2—C19 | 1.4572 (16) | C30—C35 | 1.407 (2) |
N4—C29 | 1.2870 (17) | C30—C31 | 1.4025 (19) |
N1—C5 | 1.3834 (16) | C4—H4A | 0.9900 |
N1—C4 | 1.4569 (17) | C4—H4B | 0.9900 |
N1—C2 | 1.4551 (16) | C4—C3 | 1.525 (2) |
C27—C22 | 1.3864 (17) | C19—H19A | 0.9900 |
C27—C28 | 1.4803 (17) | C19—H19B | 0.9900 |
C27—C26 | 1.3907 (17) | C19—C18 | 1.5227 (18) |
C12—C13 | 1.3879 (16) | C2—H2A | 0.9900 |
C12—C11 | 1.5113 (16) | C2—H2B | 0.9900 |
C12—C14 | 1.3970 (17) | C2—C1 | 1.5183 (19) |
C9—C8 | 1.3892 (17) | C35—C34 | 1.400 (2) |
C9—C10 | 1.3861 (17) | C3—H3A | 0.9800 |
C22—C11 | 1.5215 (16) | C3—H3B | 0.9800 |
C22—C23 | 1.3885 (17) | C3—H3C | 0.9800 |
C8—C11 | 1.5163 (16) | C18—H18A | 0.9800 |
C8—C7 | 1.3990 (17) | C18—H18B | 0.9800 |
C13—C17 | 1.3878 (17) | C18—H18C | 0.9800 |
C17—H17 | 0.9500 | C20—H20A | 0.9800 |
C17—C16 | 1.3997 (17) | C20—H20B | 0.9800 |
C16—C15 | 1.4172 (17) | C20—H20C | 0.9800 |
C10—H10 | 0.9500 | C1—H1A | 0.9800 |
C10—C5 | 1.3996 (17) | C1—H1B | 0.9800 |
C7—H7 | 0.9500 | C1—H1C | 0.9800 |
C7—C6 | 1.3798 (18) | C31—H31 | 0.9500 |
C5—C6 | 1.4165 (18) | C31—C32 | 1.380 (2) |
C6—H6 | 0.9500 | C32—H32 | 0.9500 |
C24—H24 | 0.9500 | C32—C33 | 1.385 (3) |
C24—C23 | 1.3949 (17) | C34—H34 | 0.9500 |
C24—C25 | 1.3941 (19) | C34—C33 | 1.379 (2) |
C23—H23 | 0.9500 | C33—H33 | 0.9500 |
C15—H15 | 0.9500 | ||
C13—O1—C9 | 118.45 (9) | C24—C25—H25 | 119.5 |
C35—O3—H3 | 107.4 (13) | C26—C25—C24 | 120.91 (11) |
N4—N3—C28 | 128.56 (10) | C26—C25—H25 | 119.5 |
N4—N3—C11 | 115.17 (9) | N4—C29—H29 | 120.1 |
C28—N3—C11 | 114.74 (9) | N4—C29—C30 | 119.81 (12) |
C16—N2—C21 | 120.92 (10) | C30—C29—H29 | 120.1 |
C16—N2—C19 | 120.53 (10) | N2—C21—H21A | 108.5 |
C19—N2—C21 | 118.42 (10) | N2—C21—H21B | 108.5 |
C29—N4—N3 | 120.51 (11) | N2—C21—C20 | 114.97 (11) |
C5—N1—C4 | 119.81 (10) | H21A—C21—H21B | 107.5 |
C5—N1—C2 | 121.79 (11) | C20—C21—H21A | 108.5 |
C2—N1—C4 | 117.32 (10) | C20—C21—H21B | 108.5 |
C22—C27—C28 | 109.72 (10) | C35—C30—C29 | 122.63 (12) |
C22—C27—C26 | 121.67 (12) | C31—C30—C29 | 118.74 (13) |
C26—C27—C28 | 128.59 (11) | C31—C30—C35 | 118.62 (13) |
C13—C12—C11 | 122.36 (10) | N1—C4—H4A | 108.9 |
C13—C12—C14 | 115.90 (11) | N1—C4—H4B | 108.9 |
C14—C12—C11 | 121.66 (10) | N1—C4—C3 | 113.50 (11) |
O1—C9—C8 | 123.28 (10) | H4A—C4—H4B | 107.7 |
O1—C9—C10 | 114.06 (10) | C3—C4—H4A | 108.9 |
C10—C9—C8 | 122.65 (11) | C3—C4—H4B | 108.9 |
C27—C22—C11 | 110.76 (10) | N2—C19—H19A | 108.7 |
C27—C22—C23 | 120.92 (11) | N2—C19—H19B | 108.7 |
C23—C22—C11 | 128.22 (11) | N2—C19—C18 | 114.24 (11) |
C9—C8—C11 | 122.00 (11) | H19A—C19—H19B | 107.6 |
C9—C8—C7 | 116.08 (11) | C18—C19—H19A | 108.7 |
C7—C8—C11 | 121.92 (10) | C18—C19—H19B | 108.7 |
O1—C13—C12 | 123.16 (11) | N1—C2—H2A | 108.5 |
O1—C13—C17 | 114.14 (10) | N1—C2—H2B | 108.5 |
C12—C13—C17 | 122.71 (11) | N1—C2—C1 | 115.10 (11) |
C13—C17—H17 | 119.5 | H2A—C2—H2B | 107.5 |
C13—C17—C16 | 121.01 (11) | C1—C2—H2A | 108.5 |
C16—C17—H17 | 119.5 | C1—C2—H2B | 108.5 |
O2—C28—N3 | 126.36 (12) | O3—C35—C30 | 122.46 (12) |
O2—C28—C27 | 128.73 (11) | O3—C35—C34 | 117.59 (14) |
N3—C28—C27 | 104.91 (10) | C34—C35—C30 | 119.94 (14) |
N2—C16—C17 | 121.29 (11) | C4—C3—H3A | 109.5 |
N2—C16—C15 | 121.91 (11) | C4—C3—H3B | 109.5 |
C17—C16—C15 | 116.80 (11) | C4—C3—H3C | 109.5 |
C9—C10—H10 | 119.6 | H3A—C3—H3B | 109.5 |
C9—C10—C5 | 120.88 (11) | H3A—C3—H3C | 109.5 |
C5—C10—H10 | 119.6 | H3B—C3—H3C | 109.5 |
N3—C11—C12 | 109.86 (9) | C19—C18—H18A | 109.5 |
N3—C11—C22 | 99.47 (9) | C19—C18—H18B | 109.5 |
N3—C11—C8 | 110.89 (9) | C19—C18—H18C | 109.5 |
C12—C11—C22 | 114.63 (10) | H18A—C18—H18B | 109.5 |
C12—C11—C8 | 110.56 (9) | H18A—C18—H18C | 109.5 |
C8—C11—C22 | 110.96 (9) | H18B—C18—H18C | 109.5 |
C8—C7—H7 | 118.6 | C21—C20—H20A | 109.5 |
C6—C7—C8 | 122.85 (11) | C21—C20—H20B | 109.5 |
C6—C7—H7 | 118.6 | C21—C20—H20C | 109.5 |
N1—C5—C10 | 120.35 (11) | H20A—C20—H20B | 109.5 |
N1—C5—C6 | 122.44 (11) | H20A—C20—H20C | 109.5 |
C10—C5—C6 | 117.20 (11) | H20B—C20—H20C | 109.5 |
C7—C6—C5 | 120.31 (11) | C2—C1—H1A | 109.5 |
C7—C6—H6 | 119.8 | C2—C1—H1B | 109.5 |
C5—C6—H6 | 119.8 | C2—C1—H1C | 109.5 |
C23—C24—H24 | 119.4 | H1A—C1—H1B | 109.5 |
C25—C24—H24 | 119.4 | H1A—C1—H1C | 109.5 |
C25—C24—C23 | 121.21 (12) | H1B—C1—H1C | 109.5 |
C22—C23—C24 | 117.65 (11) | C30—C31—H31 | 119.5 |
C22—C23—H23 | 121.2 | C32—C31—C30 | 120.98 (16) |
C24—C23—H23 | 121.2 | C32—C31—H31 | 119.5 |
C16—C15—H15 | 119.7 | C31—C32—H32 | 120.1 |
C14—C15—C16 | 120.59 (11) | C31—C32—C33 | 119.70 (15) |
C14—C15—H15 | 119.7 | C33—C32—H32 | 120.1 |
C27—C26—H26 | 121.2 | C35—C34—H34 | 120.1 |
C25—C26—C27 | 117.57 (12) | C33—C34—C35 | 119.83 (16) |
C25—C26—H26 | 121.2 | C33—C34—H34 | 120.1 |
C12—C14—H14 | 118.5 | C32—C33—H33 | 119.5 |
C15—C14—C12 | 122.99 (11) | C34—C33—C32 | 120.91 (14) |
C15—C14—H14 | 118.5 | C34—C33—H33 | 119.5 |
O1—C9—C8—C11 | 0.75 (17) | C10—C9—C8—C11 | −178.13 (11) |
O1—C9—C8—C7 | 179.83 (10) | C10—C9—C8—C7 | 0.94 (17) |
O1—C9—C10—C5 | −178.87 (10) | C10—C5—C6—C7 | 2.22 (18) |
O1—C13—C17—C16 | 179.34 (10) | C11—N3—N4—C29 | 168.12 (11) |
O3—C35—C34—C33 | 179.94 (14) | C11—N3—C28—O2 | 175.66 (11) |
N3—N4—C29—C30 | 175.92 (11) | C11—N3—C28—C27 | −4.11 (13) |
N2—C16—C15—C14 | 179.21 (11) | C11—C12—C13—O1 | 3.95 (18) |
N4—N3—C28—O2 | 10.6 (2) | C11—C12—C13—C17 | −176.23 (11) |
N4—N3—C28—C27 | −169.16 (11) | C11—C12—C14—C15 | 176.21 (11) |
N4—N3—C11—C12 | −66.11 (12) | C11—C22—C23—C24 | 173.34 (11) |
N4—N3—C11—C22 | 173.25 (9) | C11—C8—C7—C6 | 178.70 (11) |
N4—N3—C11—C8 | 56.40 (13) | C7—C8—C11—N3 | 56.81 (14) |
N4—C29—C30—C35 | −3.20 (19) | C7—C8—C11—C12 | 178.91 (10) |
N4—C29—C30—C31 | 178.18 (12) | C7—C8—C11—C22 | −52.75 (15) |
N1—C5—C6—C7 | −176.72 (12) | C5—N1—C4—C3 | 65.09 (16) |
C27—C22—C11—N3 | −5.88 (12) | C5—N1—C2—C1 | −86.26 (15) |
C27—C22—C11—C12 | −122.98 (11) | C23—C22—C11—N3 | 177.66 (11) |
C27—C22—C11—C8 | 110.92 (11) | C23—C22—C11—C12 | 60.56 (16) |
C27—C22—C23—C24 | −2.80 (17) | C23—C22—C11—C8 | −65.54 (15) |
C27—C26—C25—C24 | −1.80 (18) | C23—C24—C25—C26 | 1.20 (19) |
C12—C13—C17—C16 | −0.50 (18) | C26—C27—C22—C11 | −174.51 (11) |
C9—O1—C13—C12 | −5.36 (16) | C26—C27—C22—C23 | 2.25 (18) |
C9—O1—C13—C17 | 174.80 (10) | C26—C27—C28—O2 | −1.4 (2) |
C9—C8—C11—N3 | −124.17 (12) | C26—C27—C28—N3 | 178.35 (12) |
C9—C8—C11—C12 | −2.06 (15) | C14—C12—C13—O1 | −179.16 (11) |
C9—C8—C11—C22 | 126.28 (12) | C14—C12—C13—C17 | 0.67 (17) |
C9—C8—C7—C6 | −0.38 (18) | C14—C12—C11—N3 | −54.17 (14) |
C9—C10—C5—N1 | 177.28 (11) | C14—C12—C11—C22 | 56.81 (15) |
C9—C10—C5—C6 | −1.68 (17) | C14—C12—C11—C8 | −176.88 (10) |
C22—C27—C28—O2 | −179.82 (12) | C25—C24—C23—C22 | 1.12 (18) |
C22—C27—C28—N3 | −0.05 (13) | C29—C30—C35—O3 | 1.0 (2) |
C22—C27—C26—C25 | 0.11 (18) | C29—C30—C35—C34 | −178.41 (13) |
C8—C9—C10—C5 | 0.11 (18) | C29—C30—C31—C32 | 179.28 (13) |
C8—C7—C6—C5 | −1.23 (19) | C21—N2—C16—C17 | 0.60 (17) |
C13—O1—C9—C8 | 2.99 (16) | C21—N2—C16—C15 | −178.94 (11) |
C13—O1—C9—C10 | −178.03 (10) | C21—N2—C19—C18 | −102.27 (13) |
C13—C12—C11—N3 | 122.54 (12) | C30—C35—C34—C33 | −0.6 (2) |
C13—C12—C11—C22 | −126.47 (12) | C30—C31—C32—C33 | −1.0 (2) |
C13—C12—C11—C8 | −0.16 (15) | C4—N1—C5—C10 | 20.76 (18) |
C13—C12—C14—C15 | −0.71 (18) | C4—N1—C5—C6 | −160.34 (12) |
C13—C17—C16—N2 | −179.25 (11) | C4—N1—C2—C1 | 81.84 (15) |
C13—C17—C16—C15 | 0.31 (17) | C19—N2—C16—C17 | −175.33 (11) |
C17—C16—C15—C14 | −0.34 (18) | C19—N2—C16—C15 | 5.13 (17) |
C28—N3—N4—C29 | −26.88 (18) | C19—N2—C21—C20 | 96.50 (13) |
C28—N3—C11—C12 | 126.76 (11) | C2—N1—C5—C10 | −171.43 (11) |
C28—N3—C11—C22 | 6.13 (12) | C2—N1—C5—C6 | 7.48 (18) |
C28—N3—C11—C8 | −110.73 (11) | C2—N1—C4—C3 | −103.26 (13) |
C28—C27—C22—C11 | 4.02 (13) | C35—C30—C31—C32 | 0.6 (2) |
C28—C27—C22—C23 | −179.22 (10) | C35—C34—C33—C32 | 0.2 (2) |
C28—C27—C26—C25 | −178.12 (12) | C31—C30—C35—O3 | 179.64 (12) |
C16—N2—C21—C20 | −79.52 (15) | C31—C30—C35—C34 | 0.2 (2) |
C16—N2—C19—C18 | 73.76 (15) | C31—C32—C33—C34 | 0.6 (2) |
C16—C15—C14—C12 | 0.57 (19) |
Cg is the centroid of the C22–C27 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C31—H31···O3i | 0.95 | 2.77 | 3.4737 (19) | 131 |
O3—H3···N4 | 1.02 (3) | 1.72 (2) | 2.6276 (15) | 145 (2) |
C18—H18A···Cgii | 0.98 | 2.88 | 3.8191 (15) | 161 |
Symmetry codes: (i) x, −y+3/2, z−1/2; (ii) −x+1, −y+1, −z. |
Acknowledgements
This work would not have succeeded without the funding support from the Office of the Science Research Fund (ScRF), ScAWAKE from the Faculty of Science at Bangkhen, and the Faculty of Science at Si racha campus, Kasetsart University. The Center of Nanotechnology Kasetsart University, Kasetsart University Research and Development Institute (KURDI), National Nanotechnology Center (NANOTEC), Laboratory of Computational and Applied Chemistry (LCAC), the Commission on Higher Education, Ministry of Education [through the National Research University Project of Thailand (NRU) and the National Center of Excellence for Petroleum, Petrochemical and Advanced Materials (NCEPPAM)] are gratefully acknowledged for research facilities.
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