research communications
Synthesis and I
of 1,1′-bis{[4-(pyridin-2-yl)-1,2,3-triazol-1-yl]methyl}ferrocene, and its complexation with CuaDepartment of Chemistry & Physical Sciences, Nicholls State University, Thibodaux, Louisiana 70301, USA, and bDepartment of Chemistry, Louisiana State University, Baton Rouge, Louisiana, 70803, USA
*Correspondence e-mail: uttam.pokharel@nicholls.edu
The title compound, [Fe(C13H11N4)2], was synthesized starting from 1,1′-ferrocenedicarboxylic acid in a three-step reaction sequence. The dicarboxylic acid was reduced to 1,1′-ferrocenedimethanol using LiAlH4 and subsequently converted to 1,1′-bis(azidomethyl)ferrocene in the presence of NaN3. The diazide was treated with 2-ethynylpyridine under `click' conditions to give the title compound in 75% yield. The FeII center lies on an inversion center in the crystal. The two pyridyltriazole wings are oriented in an anti conformation and positioned exo from the FeII center. In the solid state, the molecules interact by C—H⋯N, C—H⋯π, and π–π interactions. The complexation of the ligand with [Cu(CH3CN)4](PF6) gives a tetranuclear dimeric complex.
Keywords: 1,1′-bis(pyridyltriazoylmethyl)ferrocene; crystal structure; click reaction; tetradentate ligand; disubstituted ferrocene; copper(I) complex.
CCDC reference: 2026000
1. Chemical context
Metal–organic supramolecular chemistry is an emerging area in inorganic chemistry: the structurally challenging functional supramolecules can be constructed from the self-assembly of multidentate organic ligands and transition-metal ions in relatively few synthetic steps (Cook & Stang, 2015). Such supramolecules are designed by careful selection of the conformational flexibility of the linker groups in multidentate ligands, and the coordination preference of transition-metal ions. We have recently studied the self-assemblies of m-xylylene- or 2,7-naphthalenebis(methylene)-bridged tetradentate bis(pyridyltriazole) ligands with CuII ions to give discrete [2 + 2] metallocycles (Pokharel et al., 2013, 2014). In a continuation of our work, we became interested in the design of metalloligands, i.e., metal-containing organic linkers, to produce mixed-metal complexes with different topologies.
Ferrocene, a well-known metallocene, exhibits high thermal stability, reversible electrochemistry, and conformational flexibility, making it an ideal precursor for the development of polymetallic metallosupramolecular complexes (Astruc, 2017). Introduction of the iron(II) center as the structural component of the ligand allows the study of electronic coupling between metal centers in heterometallic metallosupramolecular assemblies. Although 1,1′-disubstituted ferrocenes featuring the pyridyl moiety as a donor group have been exploited in metallosupramolecular assemblies (Quinodoz et al., 2004; Buda et al., 1998; Ion et al., 2002; Lindner et al., 2003; Sachsinger & Hall, 1997), the ferrocene-bridged bis(pyridyltriazole)-based tetradentate ligands are relatively new in coordination chemistry (Findlay et al., 2018; Manck et al., 2017; Romero et al., 2011). Herein, we report the synthesis of the 1,1′-bis(methylenepyridyltriazole) ferrocene ligand starting from 1,1′-ferrocenedicarboxylic acid in a three-step sequence and its complexation with CuI ions (Fig. 1).
1,1′-Ferrocenedimethanol, 2, was synthesized by reduction of 1,1′-ferrocenedicarboxylic acid, 1, in the presence of LiAlH4. The diol was treated with sodium azide in acetic acid following published procedures (Casas-Solvas et al., 2009) to give 1,1′-bis(azidomethyl)ferrocene, 3 as a viscous liquid. The compound showed a strong IR absorption at 2093 cm−1, indicating the formation of the desired diazide (Casas-Solvas et al., 2009). The diazide was treated with 2-ethynylpyridine under `click' conditions (Pokharel et al., 2013) to give the title compound in 75% yield. This new tetradentate ligand based on ferrocene is obtained as an air-stable light-brown crystalline powder.
2. Structural commentary
The II center is on an inversion center, as shown in Fig. 2. The symmetry in the molecule was also apparent in the NMR data where only one set of signals was found for the protons and carbons of the cyclopentadienyl (Cp) rings, methylene groups, and the pyridyltriazole units. The Fe—C(Cp) bond lengths are in the range 2.0349 (12)–2.0471 (13) Å [average 2.0498 (13) Å] with the Fe⋯Cp-centroid distance being 1.6550 (6) Å. The Fe—C bond to the substituted carbon [Fe—C1 2.0349 (12)] is shorter than the remaining Fe—C bond lengths, as is seen in similar 1,1′-disubstituted ferrocene derivatives (Glidewell et al., 1994). The conformation of the ferrocenyl unit is exactly staggered by inversion symmetry, and the centrosymmetry also makes the Cp—Fe—Cp linkage linear and the Cp rings parallel. The Csp3 atom, C6, is displaced towards the FeII center by 0.044 (3) Å from the least-squares plane of the Cp ring. The CCp—Csp3 and CCp—N bond lengths involving C6 are 1.4910 (19) and 1.4700 (18) Å, respectively. The pyridyltriazole moiety is oriented exo from the FeII center, with the least-squares planes of the Cp and triazole rings forming a dihedral angle of 65.68 (5)°. The nitrogen donor atoms of the pyridyltriazole units adopt an anti conformation, as is often observed in this type of chelating ligand (Crowley & Bandeen, 2010). The pyridyl and triazole units deviate slightly from coplanarity, with the N3—C7—C9—N4 torsion angle being 167.64 (13)°.
of the title compound contains one half of the molecule since the Fe3. Supramolecular features
The ), C—H⋯π, and π–π interactions (Figs. 3 and 4). The triazole carbon C8 forms a C—H⋯N interaction, with a C⋯N distance of 3.601 (2) Å to triazole N3 (at x − 1, y, z) and the Cp carbon atom C5 forms a C—H⋯N interaction with a C⋯N distance of 3.4240 (19) Å to triazole N2 (at x − 1, y, z). These two contacts form a ring with graph-set motif R22(9) (Etter et al., 1990). In addition, the triazole carbon C3 forms a C—H⋯N interaction with a C⋯N distance of 3.4625 (19) Å to pyridyl nitrogen N4 (at x, y + 1, z). Thus, the C—H⋯N contacts form a two-dimensional network normal to [001]. The pyridyltriazole moieties stack in an anti-parallel fashion about inversion centers. The pyridyl moiety of one molecule has a π–π interaction with the triazole moiety of another molecule with a dihedral angle of 11.27 (10)° and centroid–centroid distance of 3.790 Å (symmetry operation 2 − x, −y, −z). In addition, there are also C—H⋯π interactions between the hydrogen atom of the pyridyl moiety with the cyclopentadienyl ring [H12⋯Cp(centroid) = 2.692 Å; 2 − x, −y, −z;]. These two interactions thus form centrosymmetric dimers, illustrated in Fig. 4.
of the title compound is consolidated by intermolecular C—H⋯N (Table 14. Database survey
A search of the Cambridge Structural Database (Version 5.41, update of March 2020; Groom et al., 2016) for bis(pyridyltriazole) with a ferrocene linker gave no results. However, the structure of ferrocene attached to one methylenepyridyltriazole, BULQIJ (Crowley et al., 2010) has been reported. The two pyridyltriazole units connected with organic linkers, namely m-xylylene, VAJVIN (Najar et al., 2010), and p-xylylene as chloroform solvate, FUJJOK (Crowley & Bandeen, 2010) have also been reported.
5. Complexation with CuI
Complexation of the ligand 4 with CuI was performed under a nitrogen atmosphere. When [Cu(CH3CN)4]PF6 was added to a suspension of the ligand in DMF in a 1:1 ratio, the mixture was completely soluble, indicating the formation of a complex. To avoid oxidation of the complex, the resultant solution was diffused with diethyl ether vapor under nitrogen for 3 d. Under these conditions, a bright-yellow microcrystalline solid was formed. At room temperature, the 1H NMR spectrum of the complex showed a simple pattern containing the same set of signals for the ligand, indicative of the presence of one single species in solution. Compared to the spectrum of the free ligand, the proton signals of the complex, especially for the pyridyltriazole coordination pocket, are shifted downfield (Fig. 5). Similar retaining of the number of signals and the coupling patterns in the 1H NMR spectrum was observed in xylylene-linked bis(pyridyltriazole) ligands and their AgI complexes (Crowley & Bandeen, 2010). To further explore the nature of the complex in solution, we examined a MeOH/DMSO solution of the complex by positive-ion electrospray (ESMS). The ESMS spectrum of the complex contains a peak at 1273.0915 corresponding to [Cu2L2](PF6)+ with a similar isotopic pattern as the theoretical simulation (Fig. 6), indicating the formation of the [2 + 2] complex. Disappointingly, despite obtaining crystalline material, our attempts to obtain crystals suitable for single-crystal X-ray analysis failed.
6. Synthesis and crystallization
Synthesis of 1,1′-bis(hydroxymethyl)ferrocene, 2. To a stirred solution of 1,1′-ferrocenedicarboxylic acid (4.00 g, 14.59 mmol) in dry THF (400.0 mL), 1.0 M LiAlH4 (58.38 mL, 58.38 mmol) was added dropwise at room temperature under N2. The reaction vigorously produced hydrogen gas. The reaction mixture was refluxed for 2 h, by which time the starting compound was consumed, as evidenced by TLC. The reaction was again cooled to room temperature, and ethyl acetate (5 mL) and water (10 mL) were added in sequence with constant stirring. The product was extracted with ethyl acetate (4 × 150 mL). The combined organic layer was dried with anhydrous MgSO4 and volatiles removed in vacuo to give 2 (3.46 g, 96%) as a brown solid. The analytically pure product was obtained by recrystallization from toluene upon cooling. 1H NMR (acetone-d6, 400 MHz, ppm): δ 4.07 (t, 4H, 3J = 1.6 Hz, Cp), 4.13 (t, 4H, 3J = 1.6 Hz, Cp), 4.19 (t, 2H, 3J = 6.0 Hz, OH), 4.30 (d, 4H, 3J = 6.0 Hz, CH2). 13C NMR (acetone-d6, 100 MHz, ppm): δ 67.4, 67.7, 69.6, 89.7.
Synthesis of 1,1′-bis(azidomethyl)ferrocene, 3. Caution! Organic with low C/N ratio are potentially dangerous. However, we did not encounter any problem during the synthesis of diazide and its subsequent derivatization. To a stirred solution of 1,1′-hydroxymethylferrocene (1.50 g, 6.09 mmol) in glacial acetic acid (7.5 mL), sodium azide (2.23 g, 36.5 mmol) was added. The reaction was stirred for 3 h at 323 K under nitrogen. The reaction mixture was neutralized with a of sodium bicarbonate. The product was extracted with chloroform (2 × 50 mL). The organic phase was dried with anhydrous MgSO4 and the volatiles removed in vacuo to give 3 (1.50 g, 83%) as a viscous liquid. IR (ATR, cm−1): 2092 (s), 1733 (w), 1240 (m). 1H NMR (CDCl3, 400 MHz, ppm): δ 4.10 (s, 4H, CH2), 4.19 (t, 3J = 2.0 Hz, Cp), 4.22 (t, 3J = 2.0 Hz, Cp).
Synthesis of 1,1′-bis(pyridyltriazolylmethyl)ferrocene, 4. To a stirred solution of 1,1′-bis(azidomethyl)ferrocene (1.00 g, 3.34 mmol) in a mixture of DMF and water (4:1) (20 mL), Na2CO3 (354 mg, 3.34 mmol), CuSO4·5H2O (333 mg, 1.33 mmol), ascorbic acid (468 mg, 2.66 mmol), and 2-ethynylpyridine (862 mg, 8.36 mmol) were added in sequence. The reaction mixture was stirred for 20 h at room temperature, and then poured into an NH3/EDTA solution (2.00 g of Na2H2EDTA·2H2O in 5 mL of 28% aqueous NH3, diluted to 100 mL with H2O) and the mixture extracted with chloroform (3 x 100 mL). The organic layer was collected, dried over MgSO4, and evaporated to dryness. The crude product was purified by trituration with cold diethyl ether to give 4 (1.26 g, 75%) as a light-brown solid. X-ray quality crystals of the compound were obtained by vapor diffusion of diethyl ether into its solution in chloroform, m.p.: decomposes above 463 K. 1H NMR (CDCl3, 400 MHz, ppm): δ 4.24 (t, 4H, 3J = 2.0 Hz, Cp), 4.32 (t, 4H, 3J = 2.0 Hz, Cp), 5.33 (s, 4H, CH2),7.21(td, 2H, 3J = 5.2 Hz, 4J = 2.0 Hz, Ar), 7.75 (td, 2H, 3J = 8.0 Hz, 4J = 2.0 Hz, Ar), 8.05 (s, 2H, triazole-H), 8.15 (d, 2H, 3J = 7.6 Hz, Ar), 8.53 (d, 2H, 3J = 4.0 Hz, Ar) 13C NMR (CDCl3, 100 MHz, ppm): δ 49.8, 69.8, 70.2, 81.9, 120.3, 121.5, 122.9, 137.0, 148.4, 149.4, 150.2. HRESI–MS: m/z = 501.1416 [4+H]+ (calculated for C26H23FeN8 501.1442), 523.1238 [4+Na]+ (calculated for C26H23FeN8 523.1261).
Synthesis of CuI complex of 1,1′-bis(pyridyltriazolylmethyl)ferrocene, 5. To a nitrogen-purged stirred suspension of 4 (100 mg, 0.20 mmol) in DMF (10 mL), [Cu(CH3CN)4](PF6) (77 mg, 0.20 mmol) was added. The reaction produced a clear yellow solution, which was stirred for 2 h at room temperature. The reaction mixture was diffused with nitrogen-purged diethyl ether using a cannula for 3 d. The solution was decanted and the product was washed with diethyl ether and dried under a slow stream of nitrogen to give 5 (142 mg, 100%) as a yellow microcrystalline solid. A 1H NMR sample was prepared by dissolving the compound in DMSO-d6 and transferring the solution into an NMR tube under nitrogen. 1H NMR (DMSO-d6, 400 MHz, ppm): δ 4.21 (br, 8H, Cp), 4.29 (br, 8H, Cp), 5.43 (s, 5.42, 8H, CH2, 7.45 (br, 4H, Ar), 7.90 (s, 4H, triazole-H), 8.04 (br, 4H, Ar), 8.43 (br, 4H, Ar), 9.05 (br, 4H, Ar). HRESI–MS: m/z = 1273.0915 (Cu242](PF6)+ (calculated for C52H44Cu2F6Fe2N16P 1273.0914), 563.0650 [Cu4](PF6)+ (calculated for C26H22CuFeN8 563.0660).
7. Refinement
Crystal data, data collection and structure . All H atoms were located in difference maps and then treated as riding in geometrically idealized positions with C—H distances of 0.95 Å (0.99 Å for CH2) and with Uiso(H) =1.2Ueq for the attached C atom.
details are summarized in Table 2Supporting information
CCDC reference: 2026000
https://doi.org/10.1107/S2056989020011901/pk2645sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989020011901/pk2645Isup2.hkl
Data collection: APEX3 (Bruker, 2016); cell
SAINT (Bruker, 2016); data reduction: SAINT (Bruker, 2016); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014/7 (Sheldrick, 2015); molecular graphics: Mercury (Macrae et al., 2020); software used to prepare material for publication: publCIF (Westrip, 2010).[Fe(C13H11N4)2] | Z = 1 |
Mr = 502.36 | F(000) = 260 |
Triclinic, P1 | Dx = 1.505 Mg m−3 |
a = 5.7905 (3) Å | Mo Kα radiation, λ = 0.71073 Å |
b = 9.7461 (5) Å | Cell parameters from 2644 reflections |
c = 10.1720 (4) Å | θ = 3.1–33.1° |
α = 82.064 (3)° | µ = 0.71 mm−1 |
β = 84.754 (4)° | T = 90 K |
γ = 77.739 (4)° | Fragment, orange |
V = 554.44 (5) Å3 | 0.12 × 0.09 × 0.08 mm |
Bruker Kappa APEXII DUO CCD diffractometer | 4199 independent reflections |
Radiation source: fine-focus sealed tube | 3569 reflections with I > 2σ(I) |
TRIUMPH curved graphite monochromator | Rint = 0.020 |
φ and ω scans | θmax = 33.2°, θmin = 2.0° |
Absorption correction: multi-scan (SADABS; Krause et al., 2015) | h = −8→8 |
Tmin = 0.857, Tmax = 0.945 | k = −14→14 |
7058 measured reflections | l = −15→15 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.041 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.099 | H-atom parameters constrained |
S = 1.06 | w = 1/[σ2(Fo2) + (0.0526P)2 + 0.140P] where P = (Fo2 + 2Fc2)/3 |
4199 reflections | (Δ/σ)max < 0.001 |
160 parameters | Δρmax = 0.98 e Å−3 |
0 restraints | Δρmin = −0.29 e Å−3 |
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 | ||
Fe1 | 0.5000 | 0.5000 | 0.5000 | 0.00859 (7) | |
N1 | 0.9431 (2) | 0.11300 (13) | 0.36213 (12) | 0.0173 (2) | |
N2 | 1.1757 (2) | 0.11615 (13) | 0.34215 (13) | 0.0203 (2) | |
N3 | 1.2663 (2) | 0.03069 (13) | 0.25245 (13) | 0.0175 (2) | |
N4 | 0.9549 (2) | −0.19933 (13) | 0.11559 (13) | 0.0166 (2) | |
C1 | 0.6904 (2) | 0.34473 (13) | 0.39618 (12) | 0.0123 (2) | |
C2 | 0.7999 (2) | 0.46543 (16) | 0.37622 (14) | 0.0162 (3) | |
H2 | 0.9556 | 0.4668 | 0.3976 | 0.019* | |
C3 | 0.6341 (3) | 0.58282 (15) | 0.31869 (14) | 0.0186 (3) | |
H3 | 0.6595 | 0.6765 | 0.2952 | 0.022* | |
C4 | 0.4251 (3) | 0.53559 (15) | 0.30257 (13) | 0.0169 (3) | |
H4 | 0.2856 | 0.5923 | 0.2663 | 0.020* | |
C5 | 0.4585 (2) | 0.38965 (14) | 0.34947 (13) | 0.0132 (2) | |
H5 | 0.3458 | 0.3316 | 0.3498 | 0.016* | |
C6 | 0.7950 (3) | 0.19952 (16) | 0.45781 (15) | 0.0242 (3) | |
H6A | 0.8921 | 0.2067 | 0.5308 | 0.029* | |
H6B | 0.6655 | 0.1517 | 0.4970 | 0.029* | |
C7 | 1.0906 (2) | −0.02744 (13) | 0.21606 (13) | 0.0125 (2) | |
C8 | 0.8819 (2) | 0.02524 (15) | 0.28631 (14) | 0.0156 (2) | |
H8 | 0.7300 | 0.0043 | 0.2820 | 0.019* | |
C9 | 1.1331 (2) | −0.13233 (13) | 0.12183 (13) | 0.0119 (2) | |
C10 | 1.3477 (2) | −0.16117 (14) | 0.04578 (13) | 0.0141 (2) | |
H10 | 1.4713 | −0.1132 | 0.0541 | 0.017* | |
C11 | 1.3757 (3) | −0.26115 (15) | −0.04177 (14) | 0.0166 (3) | |
H11 | 1.5178 | −0.2811 | −0.0965 | 0.020* | |
C12 | 1.1936 (3) | −0.33183 (15) | −0.04847 (14) | 0.0185 (3) | |
H12 | 1.2090 | −0.4018 | −0.1069 | 0.022* | |
C13 | 0.9891 (3) | −0.29783 (16) | 0.03193 (15) | 0.0187 (3) | |
H13 | 0.8656 | −0.3472 | 0.0277 | 0.022* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Fe1 | 0.00934 (12) | 0.00722 (12) | 0.00860 (12) | −0.00031 (8) | 0.00181 (8) | −0.00256 (8) |
N1 | 0.0209 (6) | 0.0119 (5) | 0.0147 (5) | 0.0053 (4) | 0.0018 (4) | −0.0026 (4) |
N2 | 0.0243 (6) | 0.0143 (5) | 0.0223 (6) | −0.0015 (5) | 0.0000 (5) | −0.0067 (4) |
N3 | 0.0180 (6) | 0.0138 (5) | 0.0212 (6) | −0.0032 (4) | 0.0011 (4) | −0.0060 (4) |
N4 | 0.0155 (5) | 0.0146 (5) | 0.0198 (5) | −0.0033 (4) | −0.0001 (4) | −0.0029 (4) |
C1 | 0.0141 (5) | 0.0101 (5) | 0.0108 (5) | 0.0027 (4) | 0.0007 (4) | −0.0033 (4) |
C2 | 0.0120 (6) | 0.0241 (7) | 0.0148 (6) | −0.0060 (5) | 0.0042 (4) | −0.0096 (5) |
C3 | 0.0287 (7) | 0.0127 (6) | 0.0140 (6) | −0.0066 (5) | 0.0100 (5) | −0.0036 (5) |
C4 | 0.0191 (6) | 0.0175 (6) | 0.0103 (5) | 0.0047 (5) | −0.0009 (5) | −0.0010 (4) |
C5 | 0.0130 (5) | 0.0163 (6) | 0.0112 (5) | −0.0033 (4) | 0.0012 (4) | −0.0052 (4) |
C6 | 0.0351 (8) | 0.0164 (6) | 0.0128 (6) | 0.0116 (6) | 0.0029 (6) | −0.0020 (5) |
C7 | 0.0135 (5) | 0.0094 (5) | 0.0130 (5) | 0.0005 (4) | 0.0005 (4) | −0.0011 (4) |
C8 | 0.0152 (6) | 0.0135 (6) | 0.0148 (6) | 0.0026 (5) | 0.0000 (5) | −0.0001 (4) |
C9 | 0.0134 (5) | 0.0089 (5) | 0.0120 (5) | −0.0001 (4) | −0.0002 (4) | −0.0005 (4) |
C10 | 0.0149 (6) | 0.0127 (6) | 0.0141 (5) | −0.0018 (4) | 0.0011 (4) | −0.0019 (4) |
C11 | 0.0175 (6) | 0.0181 (6) | 0.0129 (6) | −0.0003 (5) | 0.0019 (5) | −0.0042 (5) |
C12 | 0.0255 (7) | 0.0147 (6) | 0.0154 (6) | −0.0023 (5) | −0.0018 (5) | −0.0047 (5) |
C13 | 0.0204 (7) | 0.0166 (6) | 0.0211 (6) | −0.0063 (5) | −0.0026 (5) | −0.0042 (5) |
Fe1—C1 | 2.0349 (12) | C2—C3 | 1.423 (2) |
Fe1—C1i | 2.0349 (12) | C2—H2 | 0.9500 |
Fe1—C2 | 2.0453 (13) | C3—C4 | 1.413 (2) |
Fe1—C2i | 2.0453 (13) | C3—H3 | 0.9500 |
Fe1—C5 | 2.0471 (13) | C4—C5 | 1.4145 (19) |
Fe1—C5i | 2.0471 (13) | C4—H4 | 0.9500 |
Fe1—C4 | 2.0602 (13) | C5—H5 | 0.9500 |
Fe1—C4i | 2.0603 (13) | C6—H6A | 0.9900 |
Fe1—C3 | 2.0614 (13) | C6—H6B | 0.9900 |
Fe1—C3i | 2.0614 (13) | C7—C8 | 1.3837 (18) |
N1—C8 | 1.3466 (19) | C7—C9 | 1.4646 (18) |
N1—N2 | 1.3497 (19) | C8—H8 | 0.9500 |
N1—C6 | 1.4700 (18) | C9—C10 | 1.3987 (18) |
N2—N3 | 1.3185 (17) | C10—C11 | 1.3838 (19) |
N3—C7 | 1.3656 (18) | C10—H10 | 0.9500 |
N4—C13 | 1.3412 (19) | C11—C12 | 1.388 (2) |
N4—C9 | 1.3435 (18) | C11—H11 | 0.9500 |
C1—C5 | 1.4248 (19) | C12—C13 | 1.382 (2) |
C1—C2 | 1.4334 (19) | C12—H12 | 0.9500 |
C1—C6 | 1.4910 (19) | C13—H13 | 0.9500 |
C1—Fe1—C1i | 180.0 | C5—C1—Fe1 | 70.03 (7) |
C1—Fe1—C2 | 41.13 (5) | C2—C1—Fe1 | 69.83 (7) |
C1i—Fe1—C2 | 138.87 (5) | C6—C1—Fe1 | 124.11 (9) |
C1—Fe1—C2i | 138.87 (5) | C3—C2—C1 | 107.90 (12) |
C1i—Fe1—C2i | 41.13 (5) | C3—C2—Fe1 | 70.34 (8) |
C2—Fe1—C2i | 180.0 | C1—C2—Fe1 | 69.04 (7) |
C1—Fe1—C5 | 40.86 (5) | C3—C2—H2 | 126.0 |
C1i—Fe1—C5 | 139.14 (5) | C1—C2—H2 | 126.0 |
C2—Fe1—C5 | 68.47 (5) | Fe1—C2—H2 | 126.1 |
C2i—Fe1—C5 | 111.53 (5) | C4—C3—C2 | 108.01 (12) |
C1—Fe1—C5i | 139.14 (5) | C4—C3—Fe1 | 69.90 (8) |
C1i—Fe1—C5i | 40.85 (5) | C2—C3—Fe1 | 69.12 (8) |
C2—Fe1—C5i | 111.53 (5) | C4—C3—H3 | 126.0 |
C2i—Fe1—C5i | 68.47 (5) | C2—C3—H3 | 126.0 |
C5—Fe1—C5i | 180.00 (7) | Fe1—C3—H3 | 126.5 |
C1—Fe1—C4 | 68.35 (5) | C3—C4—C5 | 108.52 (12) |
C1i—Fe1—C4 | 111.65 (5) | C3—C4—Fe1 | 69.99 (8) |
C2—Fe1—C4 | 67.96 (6) | C5—C4—Fe1 | 69.36 (7) |
C2i—Fe1—C4 | 112.04 (6) | C3—C4—H4 | 125.7 |
C5—Fe1—C4 | 40.29 (6) | C5—C4—H4 | 125.7 |
C5i—Fe1—C4 | 139.71 (6) | Fe1—C4—H4 | 126.5 |
C1—Fe1—C4i | 111.65 (5) | C4—C5—C1 | 108.24 (12) |
C1i—Fe1—C4i | 68.35 (5) | C4—C5—Fe1 | 70.36 (8) |
C2—Fe1—C4i | 112.04 (6) | C1—C5—Fe1 | 69.11 (7) |
C2i—Fe1—C4i | 67.96 (6) | C4—C5—H5 | 125.9 |
C5—Fe1—C4i | 139.71 (6) | C1—C5—H5 | 125.9 |
C5i—Fe1—C4i | 40.29 (5) | Fe1—C5—H5 | 126.2 |
C4—Fe1—C4i | 180.00 (8) | N1—C6—C1 | 112.79 (12) |
C1—Fe1—C3 | 68.63 (5) | N1—C6—H6A | 109.0 |
C1i—Fe1—C3 | 111.37 (5) | C1—C6—H6A | 109.0 |
C2—Fe1—C3 | 40.54 (6) | N1—C6—H6B | 109.0 |
C2i—Fe1—C3 | 139.46 (6) | C1—C6—H6B | 109.0 |
C5—Fe1—C3 | 67.93 (6) | H6A—C6—H6B | 107.8 |
C5i—Fe1—C3 | 112.07 (6) | N3—C7—C8 | 108.55 (12) |
C4—Fe1—C3 | 40.11 (6) | N3—C7—C9 | 122.77 (12) |
C4i—Fe1—C3 | 139.89 (6) | C8—C7—C9 | 128.62 (13) |
C1—Fe1—C3i | 111.37 (5) | N1—C8—C7 | 104.22 (12) |
C1i—Fe1—C3i | 68.63 (5) | N1—C8—H8 | 127.9 |
C2—Fe1—C3i | 139.46 (6) | C7—C8—H8 | 127.9 |
C2i—Fe1—C3i | 40.54 (6) | N4—C9—C10 | 122.94 (12) |
C5—Fe1—C3i | 112.07 (6) | N4—C9—C7 | 115.54 (12) |
C5i—Fe1—C3i | 67.93 (6) | C10—C9—C7 | 121.50 (12) |
C4—Fe1—C3i | 139.89 (6) | C11—C10—C9 | 118.52 (13) |
C4i—Fe1—C3i | 40.11 (6) | C11—C10—H10 | 120.7 |
C3—Fe1—C3i | 180.0 | C9—C10—H10 | 120.7 |
C8—N1—N2 | 111.35 (11) | C10—C11—C12 | 119.08 (13) |
C8—N1—C6 | 129.20 (14) | C10—C11—H11 | 120.5 |
N2—N1—C6 | 119.45 (13) | C12—C11—H11 | 120.5 |
N3—N2—N1 | 107.30 (12) | C13—C12—C11 | 118.35 (13) |
N2—N3—C7 | 108.57 (12) | C13—C12—H12 | 120.8 |
C13—N4—C9 | 117.19 (12) | C11—C12—H12 | 120.8 |
C5—C1—C2 | 107.33 (12) | N4—C13—C12 | 123.89 (14) |
C5—C1—C6 | 125.82 (13) | N4—C13—H13 | 118.1 |
C2—C1—C6 | 126.83 (14) | C12—C13—H13 | 118.1 |
C8—N1—N2—N3 | 0.31 (16) | N2—N1—C6—C1 | 88.89 (17) |
C6—N1—N2—N3 | −179.79 (12) | C5—C1—C6—N1 | 96.79 (18) |
N1—N2—N3—C7 | −0.34 (15) | C2—C1—C6—N1 | −85.10 (18) |
C5—C1—C2—C3 | 0.44 (14) | Fe1—C1—C6—N1 | −174.35 (11) |
C6—C1—C2—C3 | −177.96 (12) | N2—N3—C7—C8 | 0.26 (16) |
Fe1—C1—C2—C3 | −59.84 (9) | N2—N3—C7—C9 | −177.32 (12) |
C5—C1—C2—Fe1 | 60.28 (9) | N2—N1—C8—C7 | −0.15 (15) |
C6—C1—C2—Fe1 | −118.12 (13) | C6—N1—C8—C7 | 179.97 (13) |
C1—C2—C3—C4 | −0.26 (15) | N3—C7—C8—N1 | −0.06 (15) |
Fe1—C2—C3—C4 | −59.29 (9) | C9—C7—C8—N1 | 177.33 (13) |
C1—C2—C3—Fe1 | 59.03 (9) | C13—N4—C9—C10 | 0.0 (2) |
C2—C3—C4—C5 | −0.02 (15) | C13—N4—C9—C7 | −178.92 (12) |
Fe1—C3—C4—C5 | −58.82 (9) | N3—C7—C9—N4 | 167.64 (13) |
C2—C3—C4—Fe1 | 58.81 (9) | C8—C7—C9—N4 | −9.4 (2) |
C3—C4—C5—C1 | 0.29 (15) | N3—C7—C9—C10 | −11.3 (2) |
Fe1—C4—C5—C1 | −58.92 (9) | C8—C7—C9—C10 | 171.60 (13) |
C3—C4—C5—Fe1 | 59.21 (9) | N4—C9—C10—C11 | 1.4 (2) |
C2—C1—C5—C4 | −0.45 (14) | C7—C9—C10—C11 | −179.75 (12) |
C6—C1—C5—C4 | 177.97 (12) | C9—C10—C11—C12 | −1.7 (2) |
Fe1—C1—C5—C4 | 59.70 (9) | C10—C11—C12—C13 | 0.8 (2) |
C2—C1—C5—Fe1 | −60.15 (9) | C9—N4—C13—C12 | −1.1 (2) |
C6—C1—C5—Fe1 | 118.27 (13) | C11—C12—C13—N4 | 0.6 (2) |
C8—N1—C6—C1 | −91.24 (19) |
Symmetry code: (i) −x+1, −y+1, −z+1. |
D—H···A | D—H | H···A | D···A | D—H···A |
C8—H8···N3ii | 0.95 | 2.68 | 3.601 (2) | 163 |
C5—H5···N2ii | 0.95 | 2.51 | 3.4240 (19) | 160 |
C3—H3···N4iii | 0.95 | 2.73 | 3.4625 (19) | 135 |
C12—H12···Cpcentroidiv | 0.95 | 2.69 | 3.4861 (15) | 142 |
Symmetry codes: (ii) x−1, y, z; (iii) x, y+1, z; (iv) −x+2, −y, −z. |
Acknowledgements
The authors are grateful to the Department of Chemistry, Louisiana State University for providing access to single-crystal X-ray analysis of the reported compound without any cost.
Funding information
Funding for this research was provided by: Nicholls Research Council, Nicholls State University (USA) (grant to Uttam Pokharel).
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