metal-organic compounds
catena-Poly[[zinc(II)-bis[μ-1,3-bis(imidazol-1-ylmethyl)benzene-κ2N3:N3′]] dinitrate methanol solvate]
aDepartment of Chemistry, University of Stellenbosch, Private Bag X1, Matieland, South Africa
*Correspondence e-mail: lianger@sun.ac.za
In the title coordination compound, {[Zn(C14H14N4)2](NO3)2·CH3OH}n, the cationic complex forms a looped chain containing 24-membered M2L2 rings. The ligand adopts two distinct conformations that are alternated in subsequent loops. The ZnII ion displays a slightly distorted tetrahedral geometry being coordinated by four N atoms from four 1,3-bis(imidazol-1-ylmethyl)benzene ligands. The nitrate ions and methanol solvent molecules are located between adjacent double-stranded chains and participate in an extensive net of O—H⋯O and C—H⋯O hydrogen bonds. The resulting three-dimensional assembly is further stabilized by π–π interactions between benzene rings [centroid–centroid distances = 3.878 (2) and 3.853 (2) Å].
Related literature
For earlier studies on metal complexes of ditopic imidazole-based ligands, see: Dobrzańska et al. (2006, 2007). For similar one-dimensional double-stranded motifs formed with the title ligand, see: Li & Du (2006), Dobrzańska et al. (2008). For Zn—N distances in related tetrahedral zinc(II) complexes, see: Hoskins et al. (1997); Chawla et al. (2006).
Experimental
Crystal data
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Refinement
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Data collection: SMART (Bruker, 2001); cell SAINT (Bruker, 2002); 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/S1600536809040203/hg2574sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536809040203/hg2574Isup2.hkl
A methanolic solution of Zn(NO3)2.4H2O was added to a methanolic solution of 1,3-bis(imidazol-1-ylmethyl)benzene in a 1:2 molar ratio. Colorless crystals suitable for single-crystal X-ray diffraction were obtained by slow evaporation.
H atoms were positioned geometrically, with C—H = 0.95 (aromatic), 0.98 (methyl), 0.99 (methylene) and O—H = 0.84 Å, and refined as riding on their parent atoms with Uiso(H) = 1.5Ueq(C) for methyl H and 1.2Ueq(C,O) for all other H.
During the course of ongoing studies on metal complexes of ditopic imidazole based ligands (Dobrzańska et al., 2007; Dobrzańska et al., 2006) the title coordination compound (I) was isolated. It consists of infinite cationic double-stranded chains running parallel to [-1 - 1 1], nitrate counterions and methanol molecules. An interesting feature of I is the presence of two different conformers of the 1,3-bis(imidazol-1-ylmethyl)benzene ligand in the π (Table 2) and π-π stacking interactions between benzene rings from adjacent chains [symmetry code: -x, 1 - y, -z, centroid-centroid distance = 3.878 (2) Å with ca 1.05 Å slippage for ring C7—C12 and symmetry code: -x, 1 - y, 1 - z, centroid-centroid distance = 3.853 (2) Å with ca 2.13 Å slippage for ring C25—C30] (Fig. 2).
simultaneously with N3—C6—C13—N14 and N21—C24—C31—N32 torsion angles of 70.4 (2) and 12.2 (3)°, respectively. These ligands are bridging ZnII centres by imidazole N-atoms to form cationic looped chains, whereby each loop consists of only one type of conformers (Fig. 1), leading to alternating Zn···Zn distances with values of 9.930 (2) and 9.952 (2) Å. Similar one-dimensional double-stranded motifs were observed in the case of Cu(II) complexes with the same ligand and counterions such as Cl-, Br-, NO3- (see compounds 2, 3, 6, 7 in Dobrzańska et al., 2008) and for a Cd(II) complex with Cl- counterions (Li & Du, 2006). However, in none of these cases two distinct conformers of the ligand were present in a single chain. Furthermore it is worth noting that the corresponding N—C—C—N torsion angles for these reported compounds never exceeded 30°. Each zinc(II) ion in the chain shows a slightly deformed tetrahedral geometry with N—Zn—N bond angles in the range of 106.22 (10) - 114.88 (11)° (Table 1). Zn—N bond lengths are in good agreement with those reported for related tetrahedral zinc(II) complexes (Hoskins et al., 1997; Chawla et al., 2006). The position of the imidazole units in the M2L2 rings prevents accommodating any guest molecules inside of the ring spaces formed. Thus nitrate counterions and methanol molecules occupy the spaces between adjacent chains. Both have all of their oxygen atoms participating in an extensive net of hydrogen bonds (Table 2) leading to the formation of a three-dimensional assembly, further stabilized by C—H···For earlier studies on metal complexes of ditopic imidazole-based ligands, see: Dobrzańska et al. (2006, 2007). For similar one-dimensional double-stranded motifs formed with the title ligand, see: Li & Du (2006), Dobrzańska et al. (2008). For Zn—N distances in related tetrahedral zinc(II) complexes, see: Hoskins et al. (1997); Chawla et al. (2006). Cg1 and Cg2 are the centroids of the N1–C5 and C25–C30 rings, respectively.
Data collection: SMART (Bruker, 2001); cell
SAINT (Bruker, 2002); data reduction: SAINT (Bruker, 2002); 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).Fig. 1. Fragment of an infinite cationic chain, with the atom-numbering scheme. The alternating loops, represented in red and blue, are formed by different conformations of the ligand [symmetry codes:(i) -x, -y, -z + 1; (ii) -x + 1, -y + 1, -z]. Displacement ellipsoids are drawn at the 50% probability level. | |
Fig. 2. Packing diagram of (I) viewed down [010] showing an extensive net of hydrogen bonds (red dashed lines). Blue dashed lines show π-π stacking interactions. |
[Zn(C14H14N4)2](NO3)2·CH4O | Z = 2 |
Mr = 698.02 | F(000) = 724 |
Triclinic, P1 | Dx = 1.519 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 9.880 (2) Å | Cell parameters from 2070 reflections |
b = 12.711 (3) Å | θ = 2.7–22.5° |
c = 13.127 (3) Å | µ = 0.87 mm−1 |
α = 68.798 (4)° | T = 100 K |
β = 83.167 (4)° | Needle, colorless |
γ = 87.476 (4)° | 0.21 × 0.10 × 0.10 mm |
V = 1526.0 (6) Å3 |
Bruker APEX CCD area-detector diffractometer | 7036 independent reflections |
Radiation source: fine-focus sealed tube | 4891 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.063 |
ω scans | θmax = 28.3°, θmin = 1.7° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1997) | h = −12→13 |
Tmin = 0.838, Tmax = 0.918 | k = −16→16 |
17638 measured reflections | l = −17→16 |
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)] = 0.056 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.121 | H-atom parameters constrained |
S = 1.08 | w = 1/[σ2(Fo2) + (0.0416P)2] where P = (Fo2 + 2Fc2)/3 |
7036 reflections | (Δ/σ)max < 0.001 |
426 parameters | Δρmax = 0.65 e Å−3 |
0 restraints | Δρmin = −0.71 e Å−3 |
[Zn(C14H14N4)2](NO3)2·CH4O | γ = 87.476 (4)° |
Mr = 698.02 | V = 1526.0 (6) Å3 |
Triclinic, P1 | Z = 2 |
a = 9.880 (2) Å | Mo Kα radiation |
b = 12.711 (3) Å | µ = 0.87 mm−1 |
c = 13.127 (3) Å | T = 100 K |
α = 68.798 (4)° | 0.21 × 0.10 × 0.10 mm |
β = 83.167 (4)° |
Bruker APEX CCD area-detector diffractometer | 7036 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1997) | 4891 reflections with I > 2σ(I) |
Tmin = 0.838, Tmax = 0.918 | Rint = 0.063 |
17638 measured reflections |
R[F2 > 2σ(F2)] = 0.056 | 0 restraints |
wR(F2) = 0.121 | H-atom parameters constrained |
S = 1.08 | Δρmax = 0.65 e Å−3 |
7036 reflections | Δρmin = −0.71 e Å−3 |
426 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 | ||
Zn1 | 0.43395 (4) | 0.12561 (3) | 0.25919 (3) | 0.01622 (12) | |
N1 | 0.3848 (3) | 0.2295 (2) | 0.1144 (2) | 0.0172 (6) | |
C2 | 0.2852 (3) | 0.2180 (3) | 0.0597 (3) | 0.0180 (7) | |
H2 | 0.2209 | 0.1582 | 0.0862 | 0.022* | |
N3 | 0.2878 (3) | 0.3026 (2) | −0.0382 (2) | 0.0176 (6) | |
C4 | 0.3955 (3) | 0.3723 (3) | −0.0473 (3) | 0.0200 (8) | |
H4 | 0.4232 | 0.4385 | −0.1081 | 0.024* | |
C5 | 0.4534 (3) | 0.3278 (3) | 0.0471 (3) | 0.0203 (8) | |
H5 | 0.5292 | 0.3587 | 0.0649 | 0.024* | |
C6 | 0.1934 (3) | 0.3149 (3) | −0.1206 (3) | 0.0192 (7) | |
H6A | 0.1495 | 0.2411 | −0.1038 | 0.023* | |
H6B | 0.2467 | 0.3349 | −0.1938 | 0.023* | |
C7 | 0.0831 (3) | 0.4031 (3) | −0.1262 (2) | 0.0175 (7) | |
C8 | −0.0524 (3) | 0.3711 (3) | −0.1108 (3) | 0.0201 (8) | |
H8 | −0.0750 | 0.2939 | −0.0912 | 0.024* | |
C9 | −0.1554 (3) | 0.4517 (3) | −0.1239 (3) | 0.0225 (8) | |
H9 | −0.2480 | 0.4291 | −0.1134 | 0.027* | |
C10 | −0.1240 (3) | 0.5641 (3) | −0.1520 (3) | 0.0206 (8) | |
H10 | −0.1949 | 0.6186 | −0.1616 | 0.025* | |
C11 | 0.0113 (3) | 0.5976 (3) | −0.1663 (3) | 0.0181 (7) | |
C12 | 0.1146 (3) | 0.5170 (3) | −0.1536 (3) | 0.0167 (7) | |
H12 | 0.2072 | 0.5395 | −0.1635 | 0.020* | |
C13 | 0.0391 (3) | 0.7214 (3) | −0.1923 (3) | 0.0219 (8) | |
H13A | −0.0297 | 0.7668 | −0.2391 | 0.026* | |
H13B | 0.0268 | 0.7363 | −0.1227 | 0.026* | |
N14 | 0.1753 (3) | 0.7599 (2) | −0.2481 (2) | 0.0188 (6) | |
C15 | 0.2255 (3) | 0.7660 (3) | −0.3530 (3) | 0.0205 (8) | |
H15 | 0.1792 | 0.7456 | −0.4026 | 0.025* | |
C16 | 0.3531 (3) | 0.8065 (3) | −0.3707 (3) | 0.0204 (8) | |
H16 | 0.4130 | 0.8197 | −0.4363 | 0.025* | |
N17 | 0.3835 (3) | 0.8258 (2) | −0.2793 (2) | 0.0169 (6) | |
C18 | 0.2732 (3) | 0.7968 (3) | −0.2072 (3) | 0.0169 (7) | |
H18 | 0.2649 | 0.8017 | −0.1362 | 0.020* | |
N19 | 0.2938 (3) | 0.1338 (2) | 0.3779 (2) | 0.0176 (6) | |
C20 | 0.2854 (3) | 0.2185 (3) | 0.4147 (3) | 0.0198 (8) | |
H20 | 0.3369 | 0.2862 | 0.3822 | 0.024* | |
N21 | 0.1943 (3) | 0.1956 (2) | 0.5041 (2) | 0.0167 (6) | |
C22 | 0.1401 (3) | 0.0908 (3) | 0.5265 (3) | 0.0202 (8) | |
H22 | 0.0735 | 0.0522 | 0.5852 | 0.024* | |
C23 | 0.2015 (3) | 0.0539 (3) | 0.4475 (3) | 0.0196 (7) | |
H23 | 0.1837 | −0.0161 | 0.4411 | 0.024* | |
C24 | 0.1613 (3) | 0.2702 (3) | 0.5671 (3) | 0.0190 (7) | |
H24A | 0.2286 | 0.3324 | 0.5423 | 0.023* | |
H24B | 0.1679 | 0.2270 | 0.6460 | 0.023* | |
C25 | 0.0206 (3) | 0.3190 (3) | 0.5531 (3) | 0.0162 (7) | |
C26 | −0.0099 (3) | 0.3968 (3) | 0.4524 (3) | 0.0178 (7) | |
H26 | 0.0578 | 0.4180 | 0.3909 | 0.021* | |
C27 | −0.1391 (3) | 0.4432 (3) | 0.4423 (3) | 0.0203 (8) | |
H27 | −0.1592 | 0.4966 | 0.3735 | 0.024* | |
C28 | −0.2397 (3) | 0.4131 (3) | 0.5309 (3) | 0.0184 (7) | |
H28 | −0.3283 | 0.4452 | 0.5229 | 0.022* | |
C29 | −0.2097 (3) | 0.3357 (3) | 0.6314 (3) | 0.0164 (7) | |
C30 | −0.0793 (3) | 0.2889 (3) | 0.6421 (3) | 0.0172 (7) | |
H30 | −0.0589 | 0.2359 | 0.7110 | 0.021* | |
C31 | −0.3188 (3) | 0.2959 (3) | 0.7283 (3) | 0.0196 (8) | |
H31A | −0.2757 | 0.2690 | 0.7976 | 0.024* | |
H31B | −0.3799 | 0.3596 | 0.7286 | 0.024* | |
N32 | −0.3991 (3) | 0.2038 (2) | 0.7218 (2) | 0.0164 (6) | |
C33 | −0.5207 (3) | 0.2139 (3) | 0.6789 (3) | 0.0208 (8) | |
H33 | −0.5734 | 0.2806 | 0.6523 | 0.025* | |
C34 | −0.5507 (3) | 0.1099 (3) | 0.6821 (3) | 0.0209 (8) | |
H34 | −0.6304 | 0.0907 | 0.6587 | 0.025* | |
N35 | −0.4477 (3) | 0.0362 (2) | 0.7246 (2) | 0.0161 (6) | |
C36 | −0.3579 (3) | 0.0972 (3) | 0.7466 (3) | 0.0192 (7) | |
H36 | −0.2749 | 0.0686 | 0.7763 | 0.023* | |
N37 | −0.0133 (3) | 0.0163 (2) | 0.1673 (2) | 0.0224 (7) | |
O38 | 0.0067 (3) | 0.0871 (2) | 0.07062 (19) | 0.0298 (6) | |
O39 | −0.1117 (3) | −0.0482 (2) | 0.1936 (2) | 0.0395 (7) | |
O40 | 0.0674 (2) | 0.01307 (19) | 0.23517 (19) | 0.0248 (6) | |
N41 | 0.4830 (3) | 0.5500 (2) | −0.3360 (2) | 0.0205 (6) | |
O42 | 0.5282 (2) | 0.6026 (2) | −0.43384 (19) | 0.0270 (6) | |
O43 | 0.4038 (2) | 0.46743 (19) | −0.31273 (19) | 0.0266 (6) | |
O44 | 0.5162 (3) | 0.5791 (2) | −0.26093 (19) | 0.0345 (7) | |
C45 | 0.6595 (4) | 0.0513 (3) | 0.0162 (3) | 0.0327 (9) | |
H45A | 0.6559 | 0.0261 | 0.0964 | 0.049* | |
H45B | 0.6676 | −0.0144 | −0.0065 | 0.049* | |
H45C | 0.5760 | 0.0929 | −0.0074 | 0.049* | |
O46 | 0.7728 (3) | 0.1219 (2) | −0.0325 (2) | 0.0484 (8) | |
H46 | 0.8413 | 0.0930 | −0.0003 | 0.058* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Zn1 | 0.0157 (2) | 0.0134 (2) | 0.0171 (2) | −0.00014 (15) | −0.00078 (15) | −0.00285 (16) |
N1 | 0.0146 (15) | 0.0137 (15) | 0.0216 (15) | −0.0018 (11) | −0.0005 (12) | −0.0046 (12) |
C2 | 0.0216 (18) | 0.0119 (17) | 0.0161 (17) | −0.0010 (14) | 0.0006 (14) | −0.0003 (14) |
N3 | 0.0173 (15) | 0.0160 (15) | 0.0179 (15) | −0.0024 (12) | −0.0008 (12) | −0.0041 (12) |
C4 | 0.0194 (18) | 0.0161 (18) | 0.0201 (18) | −0.0039 (14) | −0.0003 (15) | −0.0013 (15) |
C5 | 0.0158 (18) | 0.0198 (19) | 0.0246 (19) | −0.0047 (14) | −0.0024 (15) | −0.0064 (15) |
C6 | 0.0249 (19) | 0.0137 (17) | 0.0191 (18) | −0.0034 (14) | −0.0049 (15) | −0.0051 (14) |
C7 | 0.0206 (18) | 0.0186 (18) | 0.0109 (16) | 0.0003 (14) | −0.0019 (14) | −0.0024 (14) |
C8 | 0.0243 (19) | 0.0181 (18) | 0.0185 (18) | −0.0061 (15) | −0.0018 (15) | −0.0067 (15) |
C9 | 0.0169 (18) | 0.028 (2) | 0.0231 (19) | −0.0066 (15) | −0.0003 (15) | −0.0096 (16) |
C10 | 0.0206 (19) | 0.0217 (19) | 0.0189 (18) | 0.0037 (15) | −0.0021 (15) | −0.0069 (15) |
C11 | 0.0202 (18) | 0.0156 (17) | 0.0175 (18) | −0.0029 (14) | 0.0015 (14) | −0.0054 (14) |
C12 | 0.0123 (16) | 0.0185 (18) | 0.0169 (17) | −0.0058 (14) | 0.0019 (13) | −0.0040 (14) |
C13 | 0.0152 (18) | 0.0197 (19) | 0.027 (2) | −0.0040 (14) | 0.0032 (15) | −0.0053 (16) |
N14 | 0.0172 (15) | 0.0155 (15) | 0.0228 (16) | −0.0005 (12) | −0.0008 (12) | −0.0061 (12) |
C15 | 0.026 (2) | 0.0167 (18) | 0.0176 (18) | −0.0014 (15) | 0.0008 (15) | −0.0063 (15) |
C16 | 0.0238 (19) | 0.0176 (18) | 0.0187 (18) | −0.0044 (15) | −0.0006 (15) | −0.0050 (15) |
N17 | 0.0167 (15) | 0.0140 (14) | 0.0187 (15) | −0.0013 (12) | −0.0017 (12) | −0.0044 (12) |
C18 | 0.0169 (18) | 0.0159 (17) | 0.0171 (18) | 0.0009 (14) | −0.0015 (14) | −0.0050 (14) |
N19 | 0.0164 (15) | 0.0132 (14) | 0.0206 (15) | −0.0011 (12) | −0.0018 (12) | −0.0031 (12) |
C20 | 0.0206 (19) | 0.0159 (18) | 0.0179 (18) | −0.0004 (14) | 0.0011 (14) | −0.0011 (15) |
N21 | 0.0141 (14) | 0.0157 (15) | 0.0197 (15) | 0.0008 (11) | −0.0010 (12) | −0.0060 (12) |
C22 | 0.0179 (18) | 0.0193 (18) | 0.0187 (18) | −0.0077 (14) | 0.0012 (14) | −0.0014 (15) |
C23 | 0.0218 (19) | 0.0141 (17) | 0.0211 (18) | −0.0037 (14) | −0.0029 (15) | −0.0034 (14) |
C24 | 0.0191 (18) | 0.0177 (18) | 0.0191 (18) | −0.0015 (14) | −0.0023 (14) | −0.0049 (15) |
C25 | 0.0194 (18) | 0.0141 (17) | 0.0184 (18) | −0.0009 (14) | −0.0020 (14) | −0.0096 (14) |
C26 | 0.0192 (18) | 0.0198 (18) | 0.0152 (17) | −0.0046 (14) | 0.0018 (14) | −0.0080 (14) |
C27 | 0.030 (2) | 0.0141 (17) | 0.0196 (18) | −0.0021 (15) | −0.0082 (16) | −0.0068 (15) |
C28 | 0.0182 (18) | 0.0129 (17) | 0.0263 (19) | 0.0018 (14) | −0.0081 (15) | −0.0079 (15) |
C29 | 0.0188 (18) | 0.0114 (16) | 0.0205 (18) | −0.0047 (14) | −0.0007 (14) | −0.0074 (14) |
C30 | 0.0204 (18) | 0.0150 (17) | 0.0166 (17) | 0.0024 (14) | −0.0046 (14) | −0.0055 (14) |
C31 | 0.0206 (18) | 0.0153 (18) | 0.0244 (19) | −0.0003 (14) | −0.0029 (15) | −0.0087 (15) |
N32 | 0.0135 (14) | 0.0112 (14) | 0.0207 (15) | 0.0005 (11) | 0.0000 (11) | −0.0018 (12) |
C33 | 0.0156 (18) | 0.0154 (18) | 0.029 (2) | 0.0008 (14) | −0.0051 (15) | −0.0037 (15) |
C34 | 0.0136 (17) | 0.0181 (18) | 0.028 (2) | 0.0016 (14) | −0.0071 (15) | −0.0035 (15) |
N35 | 0.0136 (14) | 0.0140 (14) | 0.0174 (15) | 0.0001 (11) | −0.0007 (11) | −0.0022 (12) |
C36 | 0.0176 (18) | 0.0168 (18) | 0.0218 (18) | 0.0023 (14) | −0.0037 (14) | −0.0049 (15) |
N37 | 0.0184 (16) | 0.0176 (16) | 0.0290 (18) | −0.0002 (13) | 0.0004 (13) | −0.0067 (14) |
O38 | 0.0385 (16) | 0.0260 (14) | 0.0173 (13) | −0.0122 (12) | −0.0016 (11) | 0.0024 (11) |
O39 | 0.0284 (15) | 0.0386 (17) | 0.0384 (17) | −0.0185 (13) | −0.0050 (12) | 0.0042 (13) |
O40 | 0.0211 (13) | 0.0266 (14) | 0.0258 (14) | 0.0013 (11) | −0.0074 (11) | −0.0069 (11) |
N41 | 0.0179 (16) | 0.0152 (15) | 0.0276 (17) | 0.0027 (12) | −0.0045 (13) | −0.0065 (13) |
O42 | 0.0277 (14) | 0.0302 (15) | 0.0194 (13) | −0.0086 (11) | 0.0036 (11) | −0.0052 (11) |
O43 | 0.0231 (14) | 0.0199 (13) | 0.0327 (15) | −0.0074 (11) | −0.0049 (11) | −0.0033 (11) |
O44 | 0.0516 (18) | 0.0274 (15) | 0.0214 (14) | −0.0173 (13) | −0.0071 (13) | −0.0023 (12) |
C45 | 0.028 (2) | 0.043 (3) | 0.030 (2) | −0.0095 (19) | 0.0003 (17) | −0.0171 (19) |
O46 | 0.0335 (17) | 0.0474 (19) | 0.0427 (18) | −0.0130 (15) | −0.0140 (14) | 0.0139 (14) |
Zn1—N1 | 1.985 (3) | N21—C22 | 1.375 (4) |
Zn1—N19 | 1.986 (3) | N21—C24 | 1.471 (4) |
Zn1—N35i | 1.989 (3) | C22—C23 | 1.357 (5) |
Zn1—N17ii | 2.009 (3) | C22—H22 | 0.9500 |
N1—C2 | 1.327 (4) | C23—H23 | 0.9500 |
N1—C5 | 1.391 (4) | C24—C25 | 1.501 (4) |
C2—N3 | 1.342 (4) | C24—H24A | 0.9900 |
C2—H2 | 0.9500 | C24—H24B | 0.9900 |
N3—C4 | 1.381 (4) | C25—C30 | 1.386 (4) |
N3—C6 | 1.473 (4) | C25—C26 | 1.393 (4) |
C4—C5 | 1.348 (4) | C26—C27 | 1.382 (4) |
C4—H4 | 0.9500 | C26—H26 | 0.9500 |
C5—H5 | 0.9500 | C27—C28 | 1.388 (4) |
C6—C7 | 1.517 (4) | C27—H27 | 0.9500 |
C6—H6A | 0.9900 | C28—C29 | 1.387 (4) |
C6—H6B | 0.9900 | C28—H28 | 0.9500 |
C7—C8 | 1.386 (4) | C29—C30 | 1.396 (4) |
C7—C12 | 1.400 (4) | C29—C31 | 1.513 (4) |
C8—C9 | 1.391 (5) | C30—H30 | 0.9500 |
C8—H8 | 0.9500 | C31—N32 | 1.476 (4) |
C9—C10 | 1.380 (4) | C31—H31A | 0.9900 |
C9—H9 | 0.9500 | C31—H31B | 0.9900 |
C10—C11 | 1.392 (4) | N32—C36 | 1.331 (4) |
C10—H10 | 0.9500 | N32—C33 | 1.368 (4) |
C11—C12 | 1.394 (4) | C33—C34 | 1.352 (4) |
C11—C13 | 1.516 (4) | C33—H33 | 0.9500 |
C12—H12 | 0.9500 | C34—N35 | 1.378 (4) |
C13—N14 | 1.467 (4) | C34—H34 | 0.9500 |
C13—H13A | 0.9900 | N35—C36 | 1.325 (4) |
C13—H13B | 0.9900 | N35—Zn1i | 1.989 (3) |
N14—C18 | 1.338 (4) | C36—H36 | 0.9500 |
N14—C15 | 1.383 (4) | N37—O39 | 1.234 (3) |
C15—C16 | 1.345 (4) | N37—O40 | 1.253 (3) |
C15—H15 | 0.9500 | N37—O38 | 1.260 (3) |
C16—N17 | 1.377 (4) | N41—O42 | 1.251 (3) |
C16—H16 | 0.9500 | N41—O44 | 1.252 (3) |
N17—C18 | 1.325 (4) | N41—O43 | 1.261 (3) |
N17—Zn1ii | 2.009 (3) | C45—O46 | 1.404 (4) |
C18—H18 | 0.9500 | C45—H45A | 0.9800 |
N19—C20 | 1.327 (4) | C45—H45B | 0.9800 |
N19—C23 | 1.382 (4) | C45—H45C | 0.9800 |
C20—N21 | 1.340 (4) | O46—H46 | 0.8400 |
C20—H20 | 0.9500 | ||
N1—Zn1—N19 | 109.85 (11) | N19—C20—H20 | 124.6 |
N1—Zn1—N35i | 114.88 (11) | N21—C20—H20 | 124.6 |
N19—Zn1—N35i | 106.22 (10) | C20—N21—C22 | 108.1 (3) |
N1—Zn1—N17ii | 107.39 (10) | C20—N21—C24 | 125.2 (3) |
N19—Zn1—N17ii | 110.59 (11) | C22—N21—C24 | 126.7 (3) |
N35i—Zn1—N17ii | 107.91 (11) | C23—C22—N21 | 105.8 (3) |
C2—N1—C5 | 105.9 (3) | C23—C22—H22 | 127.1 |
C2—N1—Zn1 | 127.9 (2) | N21—C22—H22 | 127.1 |
C5—N1—Zn1 | 126.2 (2) | C22—C23—N19 | 109.6 (3) |
N1—C2—N3 | 110.8 (3) | C22—C23—H23 | 125.2 |
N1—C2—H2 | 124.6 | N19—C23—H23 | 125.2 |
N3—C2—H2 | 124.6 | N21—C24—C25 | 111.6 (3) |
C2—N3—C4 | 107.7 (3) | N21—C24—H24A | 109.3 |
C2—N3—C6 | 125.1 (3) | C25—C24—H24A | 109.3 |
C4—N3—C6 | 127.2 (3) | N21—C24—H24B | 109.3 |
C5—C4—N3 | 106.4 (3) | C25—C24—H24B | 109.3 |
C5—C4—H4 | 126.8 | H24A—C24—H24B | 108.0 |
N3—C4—H4 | 126.8 | C30—C25—C26 | 119.4 (3) |
C4—C5—N1 | 109.3 (3) | C30—C25—C24 | 119.7 (3) |
C4—C5—H5 | 125.4 | C26—C25—C24 | 120.8 (3) |
N1—C5—H5 | 125.4 | C27—C26—C25 | 119.8 (3) |
N3—C6—C7 | 114.4 (3) | C27—C26—H26 | 120.1 |
N3—C6—H6A | 108.7 | C25—C26—H26 | 120.1 |
C7—C6—H6A | 108.7 | C26—C27—C28 | 121.1 (3) |
N3—C6—H6B | 108.7 | C26—C27—H27 | 119.5 |
C7—C6—H6B | 108.7 | C28—C27—H27 | 119.5 |
H6A—C6—H6B | 107.6 | C29—C28—C27 | 119.3 (3) |
C8—C7—C12 | 119.2 (3) | C29—C28—H28 | 120.3 |
C8—C7—C6 | 119.0 (3) | C27—C28—H28 | 120.3 |
C12—C7—C6 | 121.6 (3) | C28—C29—C30 | 119.8 (3) |
C7—C8—C9 | 120.2 (3) | C28—C29—C31 | 120.9 (3) |
C7—C8—H8 | 119.9 | C30—C29—C31 | 119.2 (3) |
C9—C8—H8 | 119.9 | C25—C30—C29 | 120.6 (3) |
C10—C9—C8 | 120.5 (3) | C25—C30—H30 | 119.7 |
C10—C9—H9 | 119.7 | C29—C30—H30 | 119.7 |
C8—C9—H9 | 119.7 | N32—C31—C29 | 110.5 (3) |
C9—C10—C11 | 120.1 (3) | N32—C31—H31A | 109.6 |
C9—C10—H10 | 120.0 | C29—C31—H31A | 109.6 |
C11—C10—H10 | 120.0 | N32—C31—H31B | 109.6 |
C10—C11—C12 | 119.5 (3) | C29—C31—H31B | 109.6 |
C10—C11—C13 | 117.6 (3) | H31A—C31—H31B | 108.1 |
C12—C11—C13 | 122.9 (3) | C36—N32—C33 | 107.8 (3) |
C11—C12—C7 | 120.5 (3) | C36—N32—C31 | 125.1 (3) |
C11—C12—H12 | 119.8 | C33—N32—C31 | 126.7 (3) |
C7—C12—H12 | 119.8 | C34—C33—N32 | 106.2 (3) |
N14—C13—C11 | 114.8 (3) | C34—C33—H33 | 126.9 |
N14—C13—H13A | 108.6 | N32—C33—H33 | 126.9 |
C11—C13—H13A | 108.6 | C33—C34—N35 | 109.4 (3) |
N14—C13—H13B | 108.6 | C33—C34—H34 | 125.3 |
C11—C13—H13B | 108.6 | N35—C34—H34 | 125.3 |
H13A—C13—H13B | 107.6 | C36—N35—C34 | 105.5 (3) |
C18—N14—C15 | 107.4 (3) | C36—N35—Zn1i | 127.8 (2) |
C18—N14—C13 | 126.2 (3) | C34—N35—Zn1i | 126.6 (2) |
C15—N14—C13 | 126.3 (3) | N35—C36—N32 | 111.1 (3) |
C16—C15—N14 | 106.2 (3) | N35—C36—H36 | 124.4 |
C16—C15—H15 | 126.9 | N32—C36—H36 | 124.4 |
N14—C15—H15 | 126.9 | O39—N37—O40 | 121.2 (3) |
C15—C16—N17 | 109.6 (3) | O39—N37—O38 | 119.7 (3) |
C15—C16—H16 | 125.2 | O40—N37—O38 | 119.2 (3) |
N17—C16—H16 | 125.2 | O42—N41—O44 | 120.1 (3) |
C18—N17—C16 | 106.0 (3) | O42—N41—O43 | 120.1 (3) |
C18—N17—Zn1ii | 128.5 (2) | O44—N41—O43 | 119.8 (3) |
C16—N17—Zn1ii | 125.3 (2) | O46—C45—H45A | 109.5 |
N17—C18—N14 | 110.8 (3) | O46—C45—H45B | 109.5 |
N17—C18—H18 | 124.6 | H45A—C45—H45B | 109.5 |
N14—C18—H18 | 124.6 | O46—C45—H45C | 109.5 |
C20—N19—C23 | 105.7 (3) | H45A—C45—H45C | 109.5 |
C20—N19—Zn1 | 123.2 (2) | H45B—C45—H45C | 109.5 |
C23—N19—Zn1 | 130.5 (2) | C45—O46—H46 | 109.5 |
N19—C20—N21 | 110.7 (3) | ||
N19—Zn1—N1—C2 | −71.8 (3) | N1—Zn1—N19—C20 | −76.4 (3) |
N35i—Zn1—N1—C2 | 47.8 (3) | N35i—Zn1—N19—C20 | 158.8 (2) |
N17ii—Zn1—N1—C2 | 167.8 (3) | N17ii—Zn1—N19—C20 | 41.9 (3) |
N19—Zn1—N1—C5 | 111.3 (3) | N1—Zn1—N19—C23 | 113.2 (3) |
N35i—Zn1—N1—C5 | −129.0 (3) | N35i—Zn1—N19—C23 | −11.6 (3) |
N17ii—Zn1—N1—C5 | −9.0 (3) | N17ii—Zn1—N19—C23 | −128.4 (3) |
C5—N1—C2—N3 | 0.5 (4) | C23—N19—C20—N21 | 0.7 (4) |
Zn1—N1—C2—N3 | −176.8 (2) | Zn1—N19—C20—N21 | −171.7 (2) |
N1—C2—N3—C4 | 0.2 (4) | N19—C20—N21—C22 | −0.2 (4) |
N1—C2—N3—C6 | 178.8 (3) | N19—C20—N21—C24 | 178.8 (3) |
C2—N3—C4—C5 | −0.9 (4) | C20—N21—C22—C23 | −0.4 (4) |
C6—N3—C4—C5 | −179.4 (3) | C24—N21—C22—C23 | −179.4 (3) |
N3—C4—C5—N1 | 1.2 (4) | N21—C22—C23—N19 | 0.8 (4) |
C2—N1—C5—C4 | −1.1 (4) | C20—N19—C23—C22 | −1.0 (4) |
Zn1—N1—C5—C4 | 176.3 (2) | Zn1—N19—C23—C22 | 170.7 (2) |
C2—N3—C6—C7 | 103.5 (4) | C20—N21—C24—C25 | 110.3 (3) |
C4—N3—C6—C7 | −78.2 (4) | C22—N21—C24—C25 | −70.9 (4) |
N3—C6—C7—C8 | −122.9 (3) | N21—C24—C25—C30 | 113.7 (3) |
N3—C6—C7—C12 | 61.3 (4) | N21—C24—C25—C26 | −68.3 (4) |
C12—C7—C8—C9 | 0.9 (5) | C30—C25—C26—C27 | 0.0 (5) |
C6—C7—C8—C9 | −175.0 (3) | C24—C25—C26—C27 | −178.0 (3) |
C7—C8—C9—C10 | −0.2 (5) | C25—C26—C27—C28 | −0.3 (5) |
C8—C9—C10—C11 | −0.7 (5) | C26—C27—C28—C29 | 0.4 (5) |
C9—C10—C11—C12 | 0.9 (5) | C27—C28—C29—C30 | −0.2 (5) |
C9—C10—C11—C13 | −177.4 (3) | C27—C28—C29—C31 | −176.6 (3) |
C10—C11—C12—C7 | −0.2 (5) | C26—C25—C30—C29 | 0.1 (5) |
C13—C11—C12—C7 | 178.0 (3) | C24—C25—C30—C29 | 178.2 (3) |
C8—C7—C12—C11 | −0.7 (5) | C28—C29—C30—C25 | 0.0 (5) |
C6—C7—C12—C11 | 175.1 (3) | C31—C29—C30—C25 | 176.4 (3) |
C10—C11—C13—N14 | −156.9 (3) | C28—C29—C31—N32 | 83.1 (4) |
C12—C11—C13—N14 | 24.9 (5) | C30—C29—C31—N32 | −93.3 (3) |
C11—C13—N14—C18 | −114.6 (4) | C29—C31—N32—C36 | 76.8 (4) |
C11—C13—N14—C15 | 66.3 (4) | C29—C31—N32—C33 | −95.7 (4) |
C18—N14—C15—C16 | 0.2 (4) | C36—N32—C33—C34 | 1.5 (4) |
C13—N14—C15—C16 | 179.4 (3) | C31—N32—C33—C34 | 175.1 (3) |
N14—C15—C16—N17 | 0.0 (4) | N32—C33—C34—N35 | −1.1 (4) |
C15—C16—N17—C18 | −0.2 (4) | C33—C34—N35—C36 | 0.3 (4) |
C15—C16—N17—Zn1ii | 174.8 (2) | C33—C34—N35—Zn1i | −176.7 (2) |
C16—N17—C18—N14 | 0.3 (3) | C34—N35—C36—N32 | 0.7 (4) |
Zn1ii—N17—C18—N14 | −174.5 (2) | Zn1i—N35—C36—N32 | 177.6 (2) |
C15—N14—C18—N17 | −0.3 (4) | C33—N32—C36—N35 | −1.4 (4) |
C13—N14—C18—N17 | −179.6 (3) | C31—N32—C36—N35 | −175.1 (3) |
Symmetry codes: (i) −x, −y, −z+1; (ii) −x+1, −y+1, −z. |
D—H···A | D—H | H···A | D···A | D—H···A |
O46—H46···O38iii | 0.84 | 1.96 | 2.755 (4) | 157 |
C2—H2···O38 | 0.95 | 2.40 | 3.240 (4) | 148 |
C2—H2···O40 | 0.95 | 2.54 | 3.420 (4) | 154 |
C4—H4···O44 | 0.95 | 2.28 | 3.216 (5) | 171 |
C6—H6B···O43 | 0.99 | 2.33 | 3.164 (4) | 141 |
C8—H8···O46iv | 0.95 | 2.54 | 3.432 (5) | 157 |
C13—H13B···O38v | 0.99 | 2.57 | 3.350 (5) | 136 |
C20—H20···O42ii | 0.95 | 2.30 | 3.085 (4) | 139 |
C20—H20···O44ii | 0.95 | 2.30 | 3.207 (5) | 160 |
C22—H22···O40i | 0.95 | 2.47 | 3.385 (4) | 162 |
C24—H24B···O39i | 0.99 | 2.51 | 3.379 (5) | 147 |
C28—H28···O42vi | 0.95 | 2.59 | 3.368 (4) | 139 |
C31—H31A···O46vi | 0.99 | 2.42 | 3.324 (4) | 151 |
C31—H31B···O43vi | 0.99 | 2.49 | 3.396 (4) | 151 |
C33—H33···O43vi | 0.95 | 2.57 | 3.313 (5) | 135 |
C36—H36···O40i | 0.95 | 2.27 | 3.135 (4) | 151 |
C10—H10···Cg1v | 0.95 | 2.79 | 3.539 (4) | 136 |
C15—H15···Cg2v | 0.95 | 2.85 | 3.762 (4) | 162 |
Symmetry codes: (i) −x, −y, −z+1; (ii) −x+1, −y+1, −z; (iii) x+1, y, z; (iv) x−1, y, z; (v) −x, −y+1, −z; (vi) x−1, y, z+1. |
Experimental details
Crystal data | |
Chemical formula | [Zn(C14H14N4)2](NO3)2·CH4O |
Mr | 698.02 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 100 |
a, b, c (Å) | 9.880 (2), 12.711 (3), 13.127 (3) |
α, β, γ (°) | 68.798 (4), 83.167 (4), 87.476 (4) |
V (Å3) | 1526.0 (6) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.87 |
Crystal size (mm) | 0.21 × 0.10 × 0.10 |
Data collection | |
Diffractometer | Bruker APEX CCD area-detector |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1997) |
Tmin, Tmax | 0.838, 0.918 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 17638, 7036, 4891 |
Rint | 0.063 |
(sin θ/λ)max (Å−1) | 0.667 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.056, 0.121, 1.08 |
No. of reflections | 7036 |
No. of parameters | 426 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.65, −0.71 |
Computer programs: SMART (Bruker, 2001), SAINT (Bruker, 2002), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), X-SEED (Barbour 2001).
Zn1—N1 | 1.985 (3) | Zn1—N35i | 1.989 (3) |
Zn1—N19 | 1.986 (3) | Zn1—N17ii | 2.009 (3) |
N1—Zn1—N19 | 109.85 (11) | N1—Zn1—N17ii | 107.39 (10) |
N1—Zn1—N35i | 114.88 (11) | N19—Zn1—N17ii | 110.59 (11) |
N19—Zn1—N35i | 106.22 (10) | N35i—Zn1—N17ii | 107.91 (11) |
Symmetry codes: (i) −x, −y, −z+1; (ii) −x+1, −y+1, −z. |
D—H···A | D—H | H···A | D···A | D—H···A |
O46—H46···O38iii | 0.84 | 1.96 | 2.755 (4) | 157 |
C2—H2···O38 | 0.95 | 2.40 | 3.240 (4) | 148 |
C2—H2···O40 | 0.95 | 2.54 | 3.420 (4) | 154 |
C4—H4···O44 | 0.95 | 2.28 | 3.216 (5) | 171 |
C6—H6B···O43 | 0.99 | 2.33 | 3.164 (4) | 141 |
C8—H8···O46iv | 0.95 | 2.54 | 3.432 (5) | 157 |
C13—H13B···O38v | 0.99 | 2.57 | 3.350 (5) | 136 |
C20—H20···O42ii | 0.95 | 2.30 | 3.085 (4) | 139 |
C20—H20···O44ii | 0.95 | 2.30 | 3.207 (5) | 160 |
C22—H22···O40i | 0.95 | 2.47 | 3.385 (4) | 162 |
C24—H24B···O39i | 0.99 | 2.51 | 3.379 (5) | 147 |
C28—H28···O42vi | 0.95 | 2.59 | 3.368 (4) | 139 |
C31—H31A···O46vi | 0.99 | 2.42 | 3.324 (4) | 151 |
C31—H31B···O43vi | 0.99 | 2.49 | 3.396 (4) | 151 |
C33—H33···O43vi | 0.95 | 2.57 | 3.313 (5) | 135 |
C36—H36···O40i | 0.95 | 2.27 | 3.135 (4) | 151 |
C10—H10···Cg1v | 0.95 | 2.79 | 3.539 (4) | 136 |
C15—H15···Cg2v | 0.95 | 2.85 | 3.762 (4) | 162 |
Symmetry codes: (i) −x, −y, −z+1; (ii) −x+1, −y+1, −z; (iii) x+1, y, z; (iv) x−1, y, z; (v) −x, −y+1, −z; (vi) x−1, y, z+1. |
Acknowledgements
The author wishes to thank the National Research Foundation of South Africa and the University of Stellenbosch for financial support.
References
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
During the course of ongoing studies on metal complexes of ditopic imidazole based ligands (Dobrzańska et al., 2007; Dobrzańska et al., 2006) the title coordination compound (I) was isolated. It consists of infinite cationic double-stranded chains running parallel to [-1 - 1 1], nitrate counterions and methanol molecules. An interesting feature of I is the presence of two different conformers of the 1,3-bis(imidazol-1-ylmethyl)benzene ligand in the asymmetric unit simultaneously with N3—C6—C13—N14 and N21—C24—C31—N32 torsion angles of 70.4 (2) and 12.2 (3)°, respectively. These ligands are bridging ZnII centres by imidazole N-atoms to form cationic looped chains, whereby each loop consists of only one type of conformers (Fig. 1), leading to alternating Zn···Zn distances with values of 9.930 (2) and 9.952 (2) Å. Similar one-dimensional double-stranded motifs were observed in the case of Cu(II) complexes with the same ligand and counterions such as Cl-, Br-, NO3- (see compounds 2, 3, 6, 7 in Dobrzańska et al., 2008) and for a Cd(II) complex with Cl- counterions (Li & Du, 2006). However, in none of these cases two distinct conformers of the ligand were present in a single chain. Furthermore it is worth noting that the corresponding N—C—C—N torsion angles for these reported compounds never exceeded 30°. Each zinc(II) ion in the chain shows a slightly deformed tetrahedral geometry with N—Zn—N bond angles in the range of 106.22 (10) - 114.88 (11)° (Table 1). Zn—N bond lengths are in good agreement with those reported for related tetrahedral zinc(II) complexes (Hoskins et al., 1997; Chawla et al., 2006). The position of the imidazole units in the M2L2 rings prevents accommodating any guest molecules inside of the ring spaces formed. Thus nitrate counterions and methanol molecules occupy the spaces between adjacent chains. Both have all of their oxygen atoms participating in an extensive net of hydrogen bonds (Table 2) leading to the formation of a three-dimensional assembly, further stabilized by C—H···π (Table 2) and π-π stacking interactions between benzene rings from adjacent chains [symmetry code: -x, 1 - y, -z, centroid-centroid distance = 3.878 (2) Å with ca 1.05 Å slippage for ring C7—C12 and symmetry code: -x, 1 - y, 1 - z, centroid-centroid distance = 3.853 (2) Å with ca 2.13 Å slippage for ring C25—C30] (Fig. 2).