organic compounds
6-[(4-Hydroxyphenyl)diazenyl]-1,10-phenanthrolin-1-ium chloride monohydrate
aDepartment of Chemistry, 600 Lincoln Ave., Charleston, IL 61920, USA
*Correspondence e-mail: memcguire@eiu.edu
In the cation of the title molecular salt, C18H13N4O+·Cl−·H2O, the dihedral angle between the mean planes of the 1,10-phenanthroline system and the phenol ring is 14.40 (19)°. The crystal packing is stabilized by O—H⋯O hydrogen bonds, weak N—H⋯Cl and O—H⋯Cl intermolecular interactions and π—π stacking interactions [centroid–centroid distance = 3.6944 (13) and 3.9702 (12) Å]
Related literature
For Ru(II)–polypyridyl complexes as solar energy conversion catalysts, see: Vos & Kelly (2006). For strongly absorbing Ru(II) complexes containing azo-dye ligands, see: McGuire et al. (1998); Malinowski & McGuire (2003); For the pKa of the phenol portion of these complexes, see: Zhang (1999). For the synthesis and characterization of 1,10-phenanthrolineazosulfonamide derivatives and their ternary Ni(II) complexes, see: Aly et al. (2006). For the synthesis of 5-nitro-1,10-phenanthroline, see: Amouyal et al. (1990) and of 5-amino-1,10-phenanthroline, see: Nasielski-Hinkens et al. (1981). For the of 4-[(E)-1-naphthyldiazenyl]phenol, see: Aslanov et al. (2009) and of 2-pyridyl-diazo-1,3 phenol, see: Xu et al. (1982).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2008); cell SAINT (Bruker, 2008); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: SHELXL97.
Supporting information
https://doi.org/10.1107/S1600536811044941/jj2106sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536811044941/jj2106Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536811044941/jj2106Isup3.mol
5-Nitro-1,10-phenanthroline (Amouyal et al., 1990) was recrystallized from 95% ethanol and then converted to 5-amino-1,10-phenanthroline (5-NH2 phen) (Nasielski-Hinkens et al., 1981). The 5-NH2-phen was diazotized by dissolving 0.1962 g (1.006 mmol) in 6 M HCl (4 ml). The resulting red solution was immersed in an ice bath and stirred for 2 min. NaNO2 (0.0713 g, 1.03 mmol) was dissolved in water (2 ml) and immersed in an ice bath. The NaNO2 solution was then added to the 5-NH2phen solution and stirred for 3 min. Phenol (0.0950 g, 1.01 mmol) was dissolved in 10 ml of a 10%(w/w) aqueous solution of NaOH and the solution was stirred for 2 min in an ice bath. This solution was then added to the solution of diazotized phenanthroline. A dark red-orange precipitate formed immediately and the mixture (pH > 10) was left to stir in an ice-bath for 4 h. The pH was adjusted to 6 with 2M HCl. The mixture was stirred at room temperature for 30–45 min, and the solid was collected by vacuum filtration and washed with cold water. Yield of dried crude product: 0.2018 g (66.82% based on 5-NH2phen). Purification was performed on a 20 x 1-cm column of 80–200 mesh alumina (Fisher) that had been slurry- packed using 50:50 CH2Cl2:ab EtOH. A 50.1-mg sample of crude product was dissolved in 25:25:50 abEtOH:MeOH:CH2Cl2 and filtered on a fine frit. The filtrate was loaded on a column and eluted with 25:25:50 ab EtOH:MeOH:CH2Cl2 resulting in two bands: yellow-orange and pink. The pink band was eluted by MeOH followed by the yellow-orange band. Evaporation of the MeOH and vacuum drying resulted in 32 mg of purified product. Crystals were grown by dissolving a small amount of solid in 1 ml of THF along with one drop of conc. HCl. This mixture was filtered using a Pasteur pipette and glass wool. Crystallization occurred after one week by slow evaporation at room temperature.
H atoms attached to N and O atoms were found in a difference Fourier map and refined independently using isotropic atomic displacement parameters. All of the H atoms bonded to aromatic C atoms were placed in geometrically calculated positions (C—H = 0.95 Å) and were included in the
in a riding model approximation, with Uiso(H) = 1.2Ueq(C).Ru(II)-polypyridyl complexes have a long history as solar energy conversion catalysts (Vos & Kelly, 2006). The molecular prototype RuII(bpy)32+ (bpy = 2,2'-bipyridine) compound and many of its analogs show extremely strong absorption in the 440–500 nm range. This absorption arises from a metal-to- ligand charge transfer (1MLCT) transition which relaxes to and populates a charge transfer
from which photon emission (typically around 600 nm) or can occur. In our prior work in this area, we have been trying to increase the of these complexes by producing polypyridyl ligands that strongly absorb visible light between 400 and 600 nm and thus act as "antennae" in Ru(II) and related metal complexes (McGuire et al., 1998). Specifically, we have synthesized and characterized a 1,10-phenanthroline-based azo dye ligand (4-[1,10]-phenanthrolinium-1-ium-5-yl-phenol chloride hydrate) consisting of 1,10-phenanthroline bonded at the 5-position to the para position on phenol through a diazo linkage. This ligand shows absorption in the 390–544 nm range depending on the solvent and the presence or absence of added acid or base (Malinowski & McGuire, 2003). The pKa of the phenol portion has been measured at 7.6 in water (Zhang, 1999). The following related crystal structures have been reported: 4-[(E)-1-naphthyldiazenyl]phenol (Aslanov et al., 2009); 2-pyridyl-diazo-1,3 phenol (Xu et al., 1982).In the title salt, (I), the ligand crystallized as the monohydrochloride monohydrate (Fig. 1). Crystal packing is stabilized by O1—H4···O2 hydrogen bonds, weak N2—H19···Cl1, O2—H20···Cl1, O2—H21···Cl1, intermolecular interactions (Table 1), N+ protonated cation (1,10-phenanthroline ring)— Cl- anion interactions (Fig. 2) and π—π stacking interactions [centroid-centroid distance = 3.6944 (13)Å (Cg3—Cg4) and 3.9702 (12)Å (Cg1—Cg4); Cg1 = N1/C1—C4/C12, Cg3 = C4/—C7/ C11/C12, Cg4 = C13—C18].
For Ru(II)–polypyridyl complexes as solar energy conversion catalysts, see: Vos & Kelly (2006). For strongly absorbing Ru(II) complexes containing azo-dye ligands, see: McGuire et al. (1998); Malinowski & McGuire (2003); For the pKa of the phenol portion of these complexes, see: Zhang (1999). For the synthesis and characterization of 1,10-phenanthrolineazosulfonamide derivatives and their ternary Ni(II) complexes, see: Aly et al. (2006). For the synthesis of 5-nitro-1,10-phenanthroline, see: Amouyal et al. (1990) and of 5-amino-1,10-phenanthroline, see: Nasielski-Hinkens et al. (1981). For the
of 4-[(E)-1-naphthyldiazenyl]phenol, see: Aslanov et al. (2009) and of 2-pyridyl-diazo-1,3 phenol, see: Xu et al. (1982).Data collection: APEX2 (Bruker, 2008); cell
SAINT (Bruker, 2008); data reduction: SAINT (Bruker, 2008); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).C18H13N4O+·Cl−·H2O | Z = 2 |
Mr = 354.79 | F(000) = 368 |
Triclinic, P1 | Dx = 1.468 Mg m−3 |
Hall symbol: -P 1 | Cu Kα radiation, λ = 1.54178 Å |
a = 7.6732 (4) Å | Cell parameters from 4384 reflections |
b = 7.7894 (4) Å | θ = 3.2–66.7° |
c = 14.1225 (7) Å | µ = 2.28 mm−1 |
α = 78.535 (3)° | T = 100 K |
β = 80.379 (3)° | Transparent plate, orange |
γ = 78.212 (3)° | 0.41 × 0.26 × 0.04 mm |
V = 802.73 (7) Å3 |
Bruker APEXII CCD diffractometer | 2806 independent reflections |
Radiation source: fine-focus sealed tube | 2407 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.051 |
Detector resolution: 8.33 pixels mm-1 | θmax = 67.4°, θmin = 3.2° |
phi and ω scans | h = −9→9 |
Absorption correction: multi-scan (SADABS; Bruker, 2008) | k = −7→9 |
Tmin = 0.454, Tmax = 0.914 | l = −16→16 |
15401 measured reflections |
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)] = 0.043 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.118 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.03 | w = 1/[σ2(Fo2) + (0.0805P)2 + 0.1676P] where P = (Fo2 + 2Fc2)/3 |
2806 reflections | (Δ/σ)max < 0.001 |
242 parameters | Δρmax = 0.40 e Å−3 |
0 restraints | Δρmin = −0.21 e Å−3 |
C18H13N4O+·Cl−·H2O | γ = 78.212 (3)° |
Mr = 354.79 | V = 802.73 (7) Å3 |
Triclinic, P1 | Z = 2 |
a = 7.6732 (4) Å | Cu Kα radiation |
b = 7.7894 (4) Å | µ = 2.28 mm−1 |
c = 14.1225 (7) Å | T = 100 K |
α = 78.535 (3)° | 0.41 × 0.26 × 0.04 mm |
β = 80.379 (3)° |
Bruker APEXII CCD diffractometer | 2806 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2008) | 2407 reflections with I > 2σ(I) |
Tmin = 0.454, Tmax = 0.914 | Rint = 0.051 |
15401 measured reflections |
R[F2 > 2σ(F2)] = 0.043 | 0 restraints |
wR(F2) = 0.118 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.03 | Δρmax = 0.40 e Å−3 |
2806 reflections | Δρmin = −0.21 e Å−3 |
242 parameters |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
Cl1 | 0.24720 (6) | 0.24063 (6) | 0.05019 (3) | 0.02974 (18) | |
O1 | 0.8362 (2) | 1.58116 (19) | −0.72107 (11) | 0.0356 (4) | |
O2 | 0.0147 (2) | 0.5892 (2) | 0.10617 (11) | 0.0319 (4) | |
N1 | 0.3212 (2) | 0.6808 (2) | −0.09907 (12) | 0.0286 (4) | |
N2 | 0.5247 (2) | 0.3608 (2) | −0.12489 (13) | 0.0278 (4) | |
N3 | 0.6421 (2) | 0.9679 (2) | −0.39335 (12) | 0.0289 (4) | |
N4 | 0.7403 (2) | 0.9508 (2) | −0.47300 (12) | 0.0288 (4) | |
C1 | 0.2241 (3) | 0.8387 (3) | −0.08742 (15) | 0.0301 (5) | |
H1 | 0.1353 | 0.8451 | −0.0320 | 0.036* | |
C2 | 0.2451 (3) | 0.9963 (3) | −0.15216 (16) | 0.0307 (5) | |
H2 | 0.1716 | 1.1059 | −0.1405 | 0.037* | |
C3 | 0.3723 (3) | 0.9915 (3) | −0.23242 (15) | 0.0289 (5) | |
H3 | 0.3878 | 1.0975 | −0.2771 | 0.035* | |
C4 | 0.4799 (3) | 0.8273 (3) | −0.24789 (14) | 0.0265 (4) | |
C5 | 0.6165 (3) | 0.8060 (3) | −0.33052 (14) | 0.0272 (4) | |
C6 | 0.7152 (3) | 0.6433 (3) | −0.34203 (15) | 0.0281 (4) | |
H6 | 0.8043 | 0.6327 | −0.3970 | 0.034* | |
C7 | 0.6860 (3) | 0.4882 (3) | −0.27224 (15) | 0.0277 (4) | |
C8 | 0.7851 (3) | 0.3169 (3) | −0.27964 (15) | 0.0302 (5) | |
H8 | 0.8755 | 0.3004 | −0.3335 | 0.036* | |
C9 | 0.7517 (3) | 0.1734 (3) | −0.20927 (16) | 0.0314 (5) | |
H9 | 0.8194 | 0.0580 | −0.2139 | 0.038* | |
C10 | 0.6177 (3) | 0.1993 (3) | −0.13131 (15) | 0.0298 (5) | |
H10 | 0.5928 | 0.1010 | −0.0826 | 0.036* | |
C11 | 0.5531 (3) | 0.5072 (3) | −0.19183 (14) | 0.0263 (4) | |
C12 | 0.4470 (3) | 0.6768 (3) | −0.17871 (14) | 0.0258 (4) | |
C13 | 0.7674 (3) | 1.1138 (3) | −0.53279 (15) | 0.0273 (4) | |
C14 | 0.6952 (3) | 1.2806 (3) | −0.50623 (16) | 0.0337 (5) | |
H14 | 0.6267 | 1.2879 | −0.4441 | 0.040* | |
C15 | 0.7232 (3) | 1.4333 (3) | −0.56975 (16) | 0.0344 (5) | |
H15 | 0.6758 | 1.5458 | −0.5508 | 0.041* | |
C16 | 0.8206 (3) | 1.4250 (3) | −0.66197 (15) | 0.0302 (5) | |
C17 | 0.8979 (3) | 1.2599 (3) | −0.68827 (15) | 0.0283 (4) | |
H17 | 0.9682 | 1.2527 | −0.7499 | 0.034* | |
C18 | 0.8705 (3) | 1.1070 (3) | −0.62302 (15) | 0.0284 (4) | |
H18 | 0.9236 | 0.9943 | −0.6405 | 0.034* | |
H4 | 0.902 (4) | 1.565 (4) | −0.783 (2) | 0.052 (8)* | |
H19 | 0.442 (4) | 0.377 (3) | −0.076 (2) | 0.045 (7)* | |
H20 | 0.077 (4) | 0.494 (4) | 0.091 (2) | 0.054 (8)* | |
H21 | −0.055 (4) | 0.622 (4) | 0.062 (2) | 0.050 (8)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl1 | 0.0299 (3) | 0.0235 (3) | 0.0305 (3) | 0.00016 (18) | −0.00177 (19) | 0.00097 (18) |
O1 | 0.0425 (9) | 0.0243 (8) | 0.0323 (8) | −0.0014 (6) | 0.0041 (7) | 0.0007 (6) |
O2 | 0.0383 (9) | 0.0256 (8) | 0.0288 (8) | 0.0005 (6) | −0.0038 (7) | −0.0041 (6) |
N1 | 0.0299 (9) | 0.0255 (9) | 0.0280 (9) | −0.0050 (7) | −0.0016 (7) | −0.0011 (7) |
N2 | 0.0282 (9) | 0.0249 (9) | 0.0272 (9) | −0.0021 (7) | −0.0023 (7) | −0.0013 (7) |
N3 | 0.0283 (9) | 0.0280 (9) | 0.0276 (9) | −0.0033 (7) | −0.0025 (7) | −0.0010 (7) |
N4 | 0.0277 (9) | 0.0292 (10) | 0.0262 (9) | −0.0026 (7) | −0.0035 (7) | 0.0005 (7) |
C1 | 0.0291 (11) | 0.0284 (11) | 0.0298 (11) | −0.0026 (8) | 0.0014 (8) | −0.0049 (8) |
C2 | 0.0345 (11) | 0.0226 (11) | 0.0330 (11) | −0.0016 (8) | −0.0031 (9) | −0.0048 (8) |
C3 | 0.0324 (11) | 0.0233 (11) | 0.0298 (11) | −0.0056 (8) | −0.0043 (8) | −0.0011 (8) |
C4 | 0.0256 (10) | 0.0268 (11) | 0.0268 (10) | −0.0040 (8) | −0.0065 (8) | −0.0017 (8) |
C5 | 0.0279 (10) | 0.0253 (11) | 0.0267 (10) | −0.0035 (8) | −0.0067 (8) | 0.0005 (8) |
C6 | 0.0268 (10) | 0.0307 (11) | 0.0251 (10) | −0.0040 (8) | −0.0005 (8) | −0.0040 (8) |
C7 | 0.0261 (10) | 0.0264 (11) | 0.0290 (11) | −0.0014 (8) | −0.0049 (8) | −0.0034 (8) |
C8 | 0.0286 (11) | 0.0291 (11) | 0.0309 (11) | −0.0008 (8) | −0.0024 (8) | −0.0059 (8) |
C9 | 0.0321 (11) | 0.0235 (11) | 0.0358 (11) | −0.0001 (8) | −0.0045 (9) | −0.0033 (8) |
C10 | 0.0321 (11) | 0.0215 (11) | 0.0337 (11) | −0.0022 (8) | −0.0067 (9) | −0.0002 (8) |
C11 | 0.0277 (10) | 0.0236 (10) | 0.0274 (10) | −0.0047 (8) | −0.0067 (8) | −0.0014 (8) |
C12 | 0.0254 (10) | 0.0246 (11) | 0.0269 (10) | −0.0032 (8) | −0.0049 (8) | −0.0032 (8) |
C13 | 0.0258 (10) | 0.0268 (11) | 0.0271 (10) | −0.0022 (8) | −0.0054 (8) | −0.0001 (8) |
C14 | 0.0363 (12) | 0.0315 (12) | 0.0280 (11) | −0.0025 (9) | 0.0030 (9) | −0.0026 (9) |
C15 | 0.0403 (12) | 0.0244 (11) | 0.0334 (12) | −0.0009 (9) | 0.0024 (9) | −0.0040 (8) |
C16 | 0.0306 (11) | 0.0268 (11) | 0.0300 (11) | −0.0031 (8) | −0.0046 (8) | 0.0013 (8) |
C17 | 0.0274 (10) | 0.0286 (11) | 0.0267 (10) | −0.0024 (8) | −0.0023 (8) | −0.0029 (8) |
C18 | 0.0281 (10) | 0.0266 (11) | 0.0276 (10) | 0.0007 (8) | −0.0053 (8) | −0.0025 (8) |
O1—C16 | 1.347 (2) | C6—C7 | 1.430 (3) |
O1—H4 | 0.95 (3) | C6—H6 | 0.9500 |
O2—H20 | 0.84 (3) | C7—C11 | 1.404 (3) |
O2—H21 | 0.85 (3) | C7—C8 | 1.408 (3) |
N1—C1 | 1.327 (3) | C8—C9 | 1.376 (3) |
N1—C12 | 1.355 (3) | C8—H8 | 0.9500 |
N2—C10 | 1.326 (3) | C9—C10 | 1.391 (3) |
N2—C11 | 1.358 (3) | C9—H9 | 0.9500 |
N2—H19 | 0.87 (3) | C10—H10 | 0.9500 |
N3—N4 | 1.259 (2) | C11—C12 | 1.432 (3) |
N3—C5 | 1.419 (3) | C13—C18 | 1.388 (3) |
N4—C13 | 1.411 (3) | C13—C14 | 1.402 (3) |
C1—C2 | 1.398 (3) | C14—C15 | 1.372 (3) |
C1—H1 | 0.9500 | C14—H14 | 0.9500 |
C2—C3 | 1.368 (3) | C15—C16 | 1.396 (3) |
C2—H2 | 0.9500 | C15—H15 | 0.9500 |
C3—C4 | 1.409 (3) | C16—C17 | 1.395 (3) |
C3—H3 | 0.9500 | C17—C18 | 1.384 (3) |
C4—C12 | 1.405 (3) | C17—H17 | 0.9500 |
C4—C5 | 1.444 (3) | C18—H18 | 0.9500 |
C5—C6 | 1.362 (3) | ||
C16—O1—H4 | 112.0 (17) | C7—C8—H8 | 119.8 |
H20—O2—H21 | 103 (3) | C8—C9—C10 | 119.17 (19) |
C1—N1—C12 | 116.57 (17) | C8—C9—H9 | 120.4 |
C10—N2—C11 | 123.09 (19) | C10—C9—H9 | 120.4 |
C10—N2—H19 | 120.1 (18) | N2—C10—C9 | 120.14 (19) |
C11—N2—H19 | 116.8 (18) | N2—C10—H10 | 119.9 |
N4—N3—C5 | 115.16 (16) | C9—C10—H10 | 119.9 |
N3—N4—C13 | 113.91 (16) | N2—C11—C7 | 119.06 (18) |
N1—C1—C2 | 123.65 (19) | N2—C11—C12 | 119.30 (18) |
N1—C1—H1 | 118.2 | C7—C11—C12 | 121.64 (18) |
C2—C1—H1 | 118.2 | N1—C12—C4 | 124.37 (18) |
C3—C2—C1 | 119.52 (18) | N1—C12—C11 | 117.06 (17) |
C3—C2—H2 | 120.2 | C4—C12—C11 | 118.57 (18) |
C1—C2—H2 | 120.2 | C18—C13—C14 | 118.72 (19) |
C2—C3—C4 | 119.12 (18) | C18—C13—N4 | 117.59 (18) |
C2—C3—H3 | 120.4 | C14—C13—N4 | 123.69 (18) |
C4—C3—H3 | 120.4 | C15—C14—C13 | 120.14 (19) |
C12—C4—C3 | 116.77 (18) | C15—C14—H14 | 119.9 |
C12—C4—C5 | 119.30 (17) | C13—C14—H14 | 119.9 |
C3—C4—C5 | 123.92 (18) | C14—C15—C16 | 120.64 (19) |
C6—C5—N3 | 124.55 (18) | C14—C15—H15 | 119.7 |
C6—C5—C4 | 121.23 (18) | C16—C15—H15 | 119.7 |
N3—C5—C4 | 114.16 (17) | O1—C16—C17 | 123.39 (19) |
C5—C6—C7 | 120.71 (19) | O1—C16—C15 | 116.79 (18) |
C5—C6—H6 | 119.6 | C17—C16—C15 | 119.82 (19) |
C7—C6—H6 | 119.6 | C18—C17—C16 | 118.89 (19) |
C11—C7—C8 | 118.16 (19) | C18—C17—H17 | 120.6 |
C11—C7—C6 | 118.55 (18) | C16—C17—H17 | 120.6 |
C8—C7—C6 | 123.28 (19) | C17—C18—C13 | 121.70 (18) |
C9—C8—C7 | 120.38 (19) | C17—C18—H18 | 119.2 |
C9—C8—H8 | 119.8 | C13—C18—H18 | 119.2 |
C5—N3—N4—C13 | −178.33 (16) | C8—C7—C11—C12 | 179.75 (18) |
C12—N1—C1—C2 | 0.2 (3) | C6—C7—C11—C12 | 0.2 (3) |
N1—C1—C2—C3 | −0.2 (3) | C1—N1—C12—C4 | 0.2 (3) |
C1—C2—C3—C4 | −0.2 (3) | C1—N1—C12—C11 | 179.76 (18) |
C2—C3—C4—C12 | 0.6 (3) | C3—C4—C12—N1 | −0.6 (3) |
C2—C3—C4—C5 | 179.22 (19) | C5—C4—C12—N1 | −179.33 (18) |
N4—N3—C5—C6 | 13.2 (3) | C3—C4—C12—C11 | 179.85 (18) |
N4—N3—C5—C4 | −169.79 (17) | C5—C4—C12—C11 | 1.1 (3) |
C12—C4—C5—C6 | −0.7 (3) | N2—C11—C12—N1 | −0.5 (3) |
C3—C4—C5—C6 | −179.33 (19) | C7—C11—C12—N1 | 179.51 (18) |
C12—C4—C5—N3 | −177.80 (17) | N2—C11—C12—C4 | 179.09 (17) |
C3—C4—C5—N3 | 3.6 (3) | C7—C11—C12—C4 | −0.9 (3) |
N3—C5—C6—C7 | 176.79 (18) | N3—N4—C13—C18 | −178.43 (17) |
C4—C5—C6—C7 | 0.0 (3) | N3—N4—C13—C14 | 1.1 (3) |
C5—C6—C7—C11 | 0.2 (3) | C18—C13—C14—C15 | 1.5 (3) |
C5—C6—C7—C8 | −179.3 (2) | N4—C13—C14—C15 | −178.00 (19) |
C11—C7—C8—C9 | −0.3 (3) | C13—C14—C15—C16 | 1.2 (3) |
C6—C7—C8—C9 | 179.22 (19) | C14—C15—C16—O1 | 177.6 (2) |
C7—C8—C9—C10 | 0.7 (3) | C14—C15—C16—C17 | −3.1 (3) |
C11—N2—C10—C9 | 0.0 (3) | O1—C16—C17—C18 | −178.53 (18) |
C8—C9—C10—N2 | −0.5 (3) | C15—C16—C17—C18 | 2.3 (3) |
C10—N2—C11—C7 | 0.4 (3) | C16—C17—C18—C13 | 0.5 (3) |
C10—N2—C11—C12 | −179.60 (18) | C14—C13—C18—C17 | −2.4 (3) |
C8—C7—C11—N2 | −0.3 (3) | N4—C13—C18—C17 | 177.18 (17) |
C6—C7—C11—N2 | −179.78 (17) |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H4···O2i | 0.95 (3) | 1.65 (3) | 2.586 (2) | 166 (3) |
N2—H19···Cl1 | 0.87 (3) | 2.35 (3) | 3.1077 (19) | 145 (2) |
O2—H20···Cl1 | 0.84 (3) | 2.25 (3) | 3.0959 (16) | 180 (3) |
O2—H21···Cl1ii | 0.85 (3) | 2.30 (3) | 3.1467 (17) | 170 (2) |
Symmetry codes: (i) x+1, y+1, z−1; (ii) −x, −y+1, −z. |
Experimental details
Crystal data | |
Chemical formula | C18H13N4O+·Cl−·H2O |
Mr | 354.79 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 100 |
a, b, c (Å) | 7.6732 (4), 7.7894 (4), 14.1225 (7) |
α, β, γ (°) | 78.535 (3), 80.379 (3), 78.212 (3) |
V (Å3) | 802.73 (7) |
Z | 2 |
Radiation type | Cu Kα |
µ (mm−1) | 2.28 |
Crystal size (mm) | 0.41 × 0.26 × 0.04 |
Data collection | |
Diffractometer | Bruker APEXII CCD |
Absorption correction | Multi-scan (SADABS; Bruker, 2008) |
Tmin, Tmax | 0.454, 0.914 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 15401, 2806, 2407 |
Rint | 0.051 |
(sin θ/λ)max (Å−1) | 0.599 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.043, 0.118, 1.03 |
No. of reflections | 2806 |
No. of parameters | 242 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.40, −0.21 |
Computer programs: APEX2 (Bruker, 2008), SAINT (Bruker, 2008), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), X-SEED (Barbour, 2001).
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H4···O2i | 0.95 (3) | 1.65 (3) | 2.586 (2) | 166 (3) |
N2—H19···Cl1 | 0.87 (3) | 2.35 (3) | 3.1077 (19) | 145 (2) |
O2—H20···Cl1 | 0.84 (3) | 2.25 (3) | 3.0959 (16) | 180 (3) |
O2—H21···Cl1ii | 0.85 (3) | 2.30 (3) | 3.1467 (17) | 170 (2) |
Symmetry codes: (i) x+1, y+1, z−1; (ii) −x, −y+1, −z. |
Acknowledgements
We gratefully acknowledge the finanical support of the Petroleum Research Fund (PRF #31222-B3) to MEM and of the National Science Foundation (CHE-0722547) to KAW.
References
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Ru(II)-polypyridyl complexes have a long history as solar energy conversion catalysts (Vos & Kelly, 2006). The molecular prototype RuII(bpy)32+ (bpy = 2,2'-bipyridine) compound and many of its analogs show extremely strong absorption in the 440–500 nm range. This absorption arises from a metal-to- ligand charge transfer (1MLCT) transition which relaxes to and populates a charge transfer excited state from which photon emission (typically around 600 nm) or electron transfer can occur. In our prior work in this area, we have been trying to increase the molar absorptivity of these complexes by producing polypyridyl ligands that strongly absorb visible light between 400 and 600 nm and thus act as "antennae" in Ru(II) and related metal complexes (McGuire et al., 1998). Specifically, we have synthesized and characterized a 1,10-phenanthroline-based azo dye ligand (4-[1,10]-phenanthrolinium-1-ium-5-yl-phenol chloride hydrate) consisting of 1,10-phenanthroline bonded at the 5-position to the para position on phenol through a diazo linkage. This ligand shows absorption in the 390–544 nm range depending on the solvent and the presence or absence of added acid or base (Malinowski & McGuire, 2003). The pKa of the phenol portion has been measured at 7.6 in water (Zhang, 1999). The following related crystal structures have been reported: 4-[(E)-1-naphthyldiazenyl]phenol (Aslanov et al., 2009); 2-pyridyl-diazo-1,3 phenol (Xu et al., 1982).
In the title salt, (I), the ligand crystallized as the monohydrochloride monohydrate (Fig. 1). Crystal packing is stabilized by O1—H4···O2 hydrogen bonds, weak N2—H19···Cl1, O2—H20···Cl1, O2—H21···Cl1, intermolecular interactions (Table 1), N+ protonated cation (1,10-phenanthroline ring)— Cl- anion interactions (Fig. 2) and π—π stacking interactions [centroid-centroid distance = 3.6944 (13)Å (Cg3—Cg4) and 3.9702 (12)Å (Cg1—Cg4); Cg1 = N1/C1—C4/C12, Cg3 = C4/—C7/ C11/C12, Cg4 = C13—C18].