metal-organic compounds
catena-Poly[[bis(O,O′-diisopropyl dithiophosphato-κ2S,S′)nickel(II)]-μ-bis(4-pyridylmethylene)diazane-κ2N:N′]
aDepartment of Chemistry, Texas A&M University, College Station, Texas 77842-3012, USA, and bDepartment of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
*Correspondence e-mail: edward.tiekink@gmail.com
The Ni atom in the title linear supramolecular polymer, [Ni(C6H14O2PS2)2(C12H10N4)]n, exists within a trans-N2S4 octahedral donor set defined by two symmetrically coordinating dithiophosphate ligands and pyridine N atoms derived from two bridging bis(4-pyridylmethylene)diazane ligands. The Ni atom lies on a centre of inversion and the bis(4-pyridylmethylene)diazane ligand is also disposed about a centre of inversion. The chains are arranged into layers sustained by C—H⋯S contacts and interdigitate with neighbouring layers, forming the crystal structure.
Related literature
For background to supramolecular polymers of metal dithiophosphates, see: Lai & Tiekink (2004); Chen et al. (2006); Aragoni et al. (2007). For a related iso-butyl structure and the synthesis, see: Berdugo & Tiekink (2008).
Experimental
Crystal data
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Refinement
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Data collection: CrystalClear (Rigaku/MSC 2005); cell CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 2006); software used to prepare material for publication: SHELXL97.
Supporting information
https://doi.org/10.1107/S1600536809043505/hb5163sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536809043505/hb5163Isup2.hkl
Compound (I) was prepared by refluxing the parent nickel dithiophosphate with bis(4-pyridylmethylene)diazane, following a literature procedure (Berdugo & Tiekink, 2008).
The H atoms were geometrically placed (C—H = 0.95–1.00 Å) and refined as riding with Uiso(H) = 1.2Ueq(C) or 1.5Ueq(methyl-C).
Interest in molecules related to the title compound (I) revolve around intriguing crystal engineering possibilities whereby different supramolecular topologies may be constructed by careful choice of organic substituents and bridging ligands (Lai & Tiekink, 2004; Chen et al., 2006; Aragoni et al., 2007). The Ni atom in (I), Fig. 1, lies on a crystallographic centre of inversion and the bis(4-pyridylmethylene)diazane molecule is similarly disposed about a centre of inversion. The Ni atom exists within an octahedral trans-N2S4 donor set defined by two symmetrically chelating dithiophosphate ligands and two trans-disposed pyridine-N atoms, Table 1. The bridging ligands lead to a
Fig. 2, and these are arranged into layers, being connected by C—H···S contacts, Table 2 and Fig. 3. Layers interdigitate to consolidate the crystal packing, Fig. 4.A similar coordination geometry and linear supramolecular polymer were observed in the iso-butyl derivative of (I) which was characterized crystallographically as a di-toluene solvate (Berdugo & Tiekink, 2008).
For background to supramolecular polymers of metal dithiophosphates, see: Lai & Tiekink (2004); Chen et al. (2006); Aragoni et al. (2007). For a related iso-butyl structure and the synthesis, see: Berdugo & Tiekink (2008).
Data collection: CrystalClear (Rigaku/MSC 2005); cell
CrystalClear (Rigaku/MSC 2005); data reduction: CrystalClear (Rigaku/MSC 2005); program(s) used to solve structure: SHEXLS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 2006); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).[Ni(C6H14O2PS2)2(C12H10N4)] | Z = 1 |
Mr = 695.47 | F(000) = 364 |
Triclinic, P1 | Dx = 1.381 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71070 Å |
a = 8.661 (2) Å | Cell parameters from 2817 reflections |
b = 8.753 (2) Å | θ = 3.0–32.3° |
c = 11.159 (3) Å | µ = 0.96 mm−1 |
α = 88.110 (8)° | T = 98 K |
β = 81.502 (7)° | Prism, brown-orange |
γ = 89.813 (10)° | 0.50 × 0.08 × 0.05 mm |
V = 836.2 (4) Å3 |
Rigaku AFC12K/SATURN724 diffractometer | 3810 independent reflections |
Radiation source: fine-focus sealed tube | 3555 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.036 |
ω scans | θmax = 27.5°, θmin = 2.8° |
Absorption correction: multi-scan (ABSCOR; Higashi, 1995) | h = −9→11 |
Tmin = 0.794, Tmax = 1 | k = −11→11 |
7552 measured reflections | l = −14→14 |
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) = 0.111 | H-atom parameters constrained |
S = 1.09 | w = 1/[σ2(Fo2) + (0.0532P)2 + 0.6278P] where P = (Fo2 + 2Fc2)/3 |
3810 reflections | (Δ/σ)max < 0.001 |
178 parameters | Δρmax = 0.63 e Å−3 |
0 restraints | Δρmin = −0.70 e Å−3 |
[Ni(C6H14O2PS2)2(C12H10N4)] | γ = 89.813 (10)° |
Mr = 695.47 | V = 836.2 (4) Å3 |
Triclinic, P1 | Z = 1 |
a = 8.661 (2) Å | Mo Kα radiation |
b = 8.753 (2) Å | µ = 0.96 mm−1 |
c = 11.159 (3) Å | T = 98 K |
α = 88.110 (8)° | 0.50 × 0.08 × 0.05 mm |
β = 81.502 (7)° |
Rigaku AFC12K/SATURN724 diffractometer | 3810 independent reflections |
Absorption correction: multi-scan (ABSCOR; Higashi, 1995) | 3555 reflections with I > 2σ(I) |
Tmin = 0.794, Tmax = 1 | Rint = 0.036 |
7552 measured reflections |
R[F2 > 2σ(F2)] = 0.043 | 0 restraints |
wR(F2) = 0.111 | H-atom parameters constrained |
S = 1.09 | Δρmax = 0.63 e Å−3 |
3810 reflections | Δρmin = −0.70 e Å−3 |
178 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 | ||
Ni | 0.5000 | 0.5000 | 0.5000 | 0.01506 (12) | |
S1 | 0.73976 (6) | 0.43573 (6) | 0.58844 (5) | 0.01900 (14) | |
S2 | 0.46123 (7) | 0.68201 (6) | 0.66788 (5) | 0.01887 (14) | |
P1 | 0.64607 (7) | 0.57524 (7) | 0.71650 (5) | 0.01822 (15) | |
O1 | 0.5953 (2) | 0.48949 (19) | 0.84272 (15) | 0.0223 (4) | |
O2 | 0.7711 (2) | 0.6930 (2) | 0.75100 (15) | 0.0241 (4) | |
N1 | 0.3710 (2) | 0.3357 (2) | 0.61516 (17) | 0.0177 (4) | |
N2 | 0.0259 (2) | 0.0611 (2) | 0.95949 (18) | 0.0230 (4) | |
C1 | 0.6944 (3) | 0.3733 (3) | 0.8926 (2) | 0.0261 (5) | |
H1 | 0.7730 | 0.3345 | 0.8257 | 0.031* | |
C2 | 0.5865 (3) | 0.2446 (3) | 0.9442 (2) | 0.0315 (6) | |
H2A | 0.5378 | 0.2009 | 0.8792 | 0.047* | |
H2B | 0.5053 | 0.2840 | 1.0061 | 0.047* | |
H2C | 0.6464 | 0.1653 | 0.9810 | 0.047* | |
C3 | 0.7778 (3) | 0.4463 (3) | 0.9858 (2) | 0.0305 (6) | |
H3A | 0.8473 | 0.5272 | 0.9464 | 0.046* | |
H3B | 0.8393 | 0.3688 | 1.0230 | 0.046* | |
H3C | 0.7009 | 0.4903 | 1.0486 | 0.046* | |
C4 | 0.8388 (3) | 0.8094 (3) | 0.6614 (2) | 0.0266 (5) | |
H4 | 0.7952 | 0.7981 | 0.5840 | 0.032* | |
C5 | 1.0132 (3) | 0.7830 (3) | 0.6398 (3) | 0.0384 (7) | |
H5A | 1.0350 | 0.6822 | 0.6055 | 0.058* | |
H5B | 1.0544 | 0.7876 | 0.7168 | 0.058* | |
H5C | 1.0634 | 0.8621 | 0.5831 | 0.058* | |
C6 | 0.7934 (3) | 0.9641 (3) | 0.7138 (3) | 0.0380 (7) | |
H6A | 0.6795 | 0.9747 | 0.7249 | 0.057* | |
H6B | 0.8410 | 1.0454 | 0.6581 | 0.057* | |
H6C | 0.8303 | 0.9718 | 0.7923 | 0.057* | |
C7 | 0.4224 (3) | 0.1924 (3) | 0.6265 (2) | 0.0198 (4) | |
H7 | 0.5144 | 0.1624 | 0.5755 | 0.024* | |
C8 | 0.3473 (3) | 0.0860 (3) | 0.7094 (2) | 0.0210 (5) | |
H8 | 0.3865 | −0.0153 | 0.7138 | 0.025* | |
C9 | 0.2132 (3) | 0.1289 (3) | 0.7867 (2) | 0.0194 (4) | |
C10 | 0.1577 (3) | 0.2772 (3) | 0.7726 (2) | 0.0212 (5) | |
H10 | 0.0653 | 0.3102 | 0.8217 | 0.025* | |
C11 | 0.2384 (3) | 0.3754 (3) | 0.6868 (2) | 0.0208 (5) | |
H11 | 0.1990 | 0.4758 | 0.6775 | 0.025* | |
C12 | 0.1396 (3) | 0.0206 (3) | 0.8798 (2) | 0.0225 (5) | |
H12 | 0.1765 | −0.0817 | 0.8815 | 0.027* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Ni | 0.0173 (2) | 0.0127 (2) | 0.0143 (2) | 0.00009 (15) | 0.00006 (15) | 0.00119 (14) |
S1 | 0.0197 (3) | 0.0198 (3) | 0.0170 (3) | 0.0034 (2) | −0.0009 (2) | −0.0008 (2) |
S2 | 0.0208 (3) | 0.0174 (3) | 0.0183 (3) | 0.0039 (2) | −0.0023 (2) | −0.0019 (2) |
P1 | 0.0192 (3) | 0.0193 (3) | 0.0158 (3) | 0.0020 (2) | −0.0015 (2) | −0.0011 (2) |
O1 | 0.0243 (8) | 0.0249 (8) | 0.0174 (8) | 0.0055 (7) | −0.0025 (6) | 0.0016 (6) |
O2 | 0.0240 (9) | 0.0279 (9) | 0.0209 (9) | −0.0010 (7) | −0.0045 (7) | −0.0036 (7) |
N1 | 0.0182 (9) | 0.0170 (9) | 0.0165 (9) | −0.0004 (7) | 0.0013 (7) | 0.0017 (7) |
N2 | 0.0238 (10) | 0.0212 (10) | 0.0223 (11) | −0.0065 (8) | 0.0006 (8) | 0.0090 (8) |
C1 | 0.0270 (12) | 0.0323 (13) | 0.0186 (12) | 0.0112 (10) | −0.0032 (10) | 0.0033 (9) |
C2 | 0.0412 (15) | 0.0265 (13) | 0.0280 (14) | 0.0055 (11) | −0.0096 (11) | 0.0026 (10) |
C3 | 0.0256 (13) | 0.0412 (15) | 0.0250 (13) | 0.0024 (11) | −0.0059 (10) | 0.0051 (11) |
C4 | 0.0274 (12) | 0.0259 (12) | 0.0266 (13) | −0.0038 (10) | −0.0034 (10) | −0.0033 (10) |
C5 | 0.0279 (14) | 0.0344 (15) | 0.0503 (19) | −0.0032 (12) | 0.0044 (12) | −0.0087 (13) |
C6 | 0.0298 (14) | 0.0289 (14) | 0.056 (2) | 0.0019 (11) | −0.0081 (13) | −0.0088 (13) |
C7 | 0.0222 (11) | 0.0181 (10) | 0.0184 (11) | 0.0002 (9) | −0.0008 (9) | 0.0019 (8) |
C8 | 0.0240 (11) | 0.0155 (10) | 0.0233 (12) | 0.0003 (9) | −0.0028 (9) | 0.0013 (8) |
C9 | 0.0193 (11) | 0.0199 (11) | 0.0191 (11) | −0.0027 (8) | −0.0040 (8) | 0.0028 (8) |
C10 | 0.0198 (11) | 0.0209 (11) | 0.0210 (12) | −0.0004 (9) | 0.0023 (9) | 0.0019 (9) |
C11 | 0.0209 (11) | 0.0184 (10) | 0.0213 (12) | 0.0023 (9) | 0.0020 (9) | 0.0049 (8) |
C12 | 0.0229 (11) | 0.0224 (11) | 0.0228 (12) | −0.0046 (9) | −0.0062 (9) | 0.0056 (9) |
Ni—S1 | 2.4827 (7) | C3—H3A | 0.9800 |
Ni—S2 | 2.4835 (7) | C3—H3B | 0.9800 |
Ni—N1 | 2.1051 (19) | C3—H3C | 0.9800 |
Ni—N1i | 2.1051 (19) | C4—C5 | 1.513 (4) |
Ni—S1i | 2.4827 (7) | C4—C6 | 1.520 (4) |
Ni—S2i | 2.4835 (7) | C4—H4 | 1.0000 |
S1—P1 | 1.9895 (9) | C5—H5A | 0.9800 |
S2—P1 | 1.9859 (9) | C5—H5B | 0.9800 |
P1—O1 | 1.5779 (17) | C5—H5C | 0.9800 |
P1—O2 | 1.5934 (18) | C6—H6A | 0.9800 |
O1—C1 | 1.476 (3) | C6—H6B | 0.9800 |
O2—C4 | 1.464 (3) | C6—H6C | 0.9800 |
N1—C7 | 1.338 (3) | C7—C8 | 1.384 (3) |
N1—C11 | 1.350 (3) | C7—H7 | 0.9500 |
N2—C12 | 1.283 (3) | C8—C9 | 1.399 (3) |
N2—N2ii | 1.408 (4) | C8—H8 | 0.9500 |
C1—C2 | 1.510 (4) | C9—C10 | 1.395 (3) |
C1—C3 | 1.511 (4) | C9—C12 | 1.459 (3) |
C1—H1 | 1.0000 | C10—C11 | 1.377 (3) |
C2—H2A | 0.9800 | C10—H10 | 0.9500 |
C2—H2B | 0.9800 | C11—H11 | 0.9500 |
C2—H2C | 0.9800 | C12—H12 | 0.9500 |
N1—Ni—S1i | 89.02 (6) | C1—C3—H3B | 109.5 |
N1i—Ni—S1i | 90.98 (6) | H3A—C3—H3B | 109.5 |
N1—Ni—S1 | 90.98 (6) | C1—C3—H3C | 109.5 |
N1i—Ni—S1 | 89.02 (6) | H3A—C3—H3C | 109.5 |
N1—Ni—S2i | 91.02 (6) | H3B—C3—H3C | 109.5 |
N1i—Ni—S2i | 88.98 (6) | O2—C4—C5 | 107.1 (2) |
S1i—Ni—S2i | 82.46 (2) | O2—C4—C6 | 107.0 (2) |
S1—Ni—S2i | 97.54 (2) | C5—C4—C6 | 113.4 (2) |
N1—Ni—S2 | 88.98 (6) | O2—C4—H4 | 109.8 |
N1i—Ni—S2 | 91.02 (6) | C5—C4—H4 | 109.8 |
S1i—Ni—S2 | 97.54 (2) | C6—C4—H4 | 109.8 |
S1—Ni—S2 | 82.46 (2) | C4—C5—H5A | 109.5 |
S1i—Ni—S1 | 180.0 | C4—C5—H5B | 109.5 |
S2i—Ni—S2 | 180.0 | H5A—C5—H5B | 109.5 |
N1i—Ni—N1 | 180.0 | C4—C5—H5C | 109.5 |
P1—S1—Ni | 82.80 (3) | H5A—C5—H5C | 109.5 |
P1—S2—Ni | 82.85 (3) | H5B—C5—H5C | 109.5 |
O1—P1—O2 | 100.84 (10) | C4—C6—H6A | 109.5 |
O1—P1—S2 | 108.61 (7) | C4—C6—H6B | 109.5 |
O2—P1—S2 | 111.61 (7) | H6A—C6—H6B | 109.5 |
O1—P1—S1 | 112.72 (7) | C4—C6—H6C | 109.5 |
O2—P1—S1 | 111.82 (7) | H6A—C6—H6C | 109.5 |
S2—P1—S1 | 110.84 (4) | H6B—C6—H6C | 109.5 |
C1—O1—P1 | 122.47 (15) | N1—C7—C8 | 122.9 (2) |
C4—O2—P1 | 119.75 (15) | N1—C7—H7 | 118.6 |
C7—N1—C11 | 117.73 (19) | C8—C7—H7 | 118.6 |
C7—N1—Ni | 121.63 (15) | C7—C8—C9 | 119.4 (2) |
C11—N1—Ni | 120.48 (15) | C7—C8—H8 | 120.3 |
C12—N2—N2ii | 111.3 (2) | C9—C8—H8 | 120.3 |
O1—C1—C2 | 106.2 (2) | C10—C9—C8 | 117.6 (2) |
O1—C1—C3 | 108.7 (2) | C10—C9—C12 | 122.7 (2) |
C2—C1—C3 | 113.5 (2) | C8—C9—C12 | 119.7 (2) |
O1—C1—H1 | 109.5 | C11—C10—C9 | 119.2 (2) |
C2—C1—H1 | 109.5 | C11—C10—H10 | 120.4 |
C3—C1—H1 | 109.5 | C9—C10—H10 | 120.4 |
C1—C2—H2A | 109.5 | N1—C11—C10 | 123.1 (2) |
C1—C2—H2B | 109.5 | N1—C11—H11 | 118.4 |
H2A—C2—H2B | 109.5 | C10—C11—H11 | 118.4 |
C1—C2—H2C | 109.5 | N2—C12—C9 | 121.1 (2) |
H2A—C2—H2C | 109.5 | N2—C12—H12 | 119.4 |
H2B—C2—H2C | 109.5 | C9—C12—H12 | 119.4 |
C1—C3—H3A | 109.5 | ||
N1—Ni—S1—P1 | −82.10 (6) | S2—Ni—N1—C7 | −131.96 (18) |
N1i—Ni—S1—P1 | 97.90 (6) | S1i—Ni—N1—C11 | −54.34 (18) |
S2i—Ni—S1—P1 | −173.26 (3) | S1—Ni—N1—C11 | 125.66 (18) |
S2—Ni—S1—P1 | 6.74 (3) | S2i—Ni—N1—C11 | −136.78 (18) |
N1—Ni—S2—P1 | 84.37 (6) | S2—Ni—N1—C11 | 43.22 (18) |
N1i—Ni—S2—P1 | −95.63 (6) | P1—O1—C1—C2 | −137.26 (18) |
S1i—Ni—S2—P1 | 173.24 (3) | P1—O1—C1—C3 | 100.3 (2) |
S1—Ni—S2—P1 | −6.76 (3) | P1—O2—C4—C5 | −119.8 (2) |
Ni—S2—P1—O1 | −115.40 (7) | P1—O2—C4—C6 | 118.37 (19) |
Ni—S2—P1—O2 | 134.30 (7) | C11—N1—C7—C8 | −1.3 (3) |
Ni—S2—P1—S1 | 8.96 (3) | Ni—N1—C7—C8 | 174.02 (18) |
Ni—S1—P1—O1 | 113.02 (8) | N1—C7—C8—C9 | −1.1 (4) |
Ni—S1—P1—O2 | −134.19 (7) | C7—C8—C9—C10 | 2.6 (3) |
Ni—S1—P1—S2 | −8.96 (3) | C7—C8—C9—C12 | −175.8 (2) |
O2—P1—O1—C1 | −75.87 (19) | C8—C9—C10—C11 | −1.8 (3) |
S2—P1—O1—C1 | 166.73 (16) | C12—C9—C10—C11 | 176.6 (2) |
S1—P1—O1—C1 | 43.51 (19) | C7—N1—C11—C10 | 2.1 (4) |
O1—P1—O2—C4 | −173.76 (16) | Ni—N1—C11—C10 | −173.22 (18) |
S2—P1—O2—C4 | −58.58 (17) | C9—C10—C11—N1 | −0.6 (4) |
S1—P1—O2—C4 | 66.22 (17) | N2ii—N2—C12—C9 | −179.5 (2) |
S1i—Ni—N1—C7 | 130.48 (18) | C10—C9—C12—N2 | −5.2 (4) |
S1—Ni—N1—C7 | −49.52 (18) | C8—C9—C12—N2 | 173.1 (2) |
S2i—Ni—N1—C7 | 48.04 (18) |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x, −y, −z+2. |
D—H···A | D—H | H···A | D···A | D—H···A |
C8—H8···S2iii | 0.95 | 2.77 | 3.694 (3) | 164 |
Symmetry code: (iii) x, y−1, z. |
Experimental details
Crystal data | |
Chemical formula | [Ni(C6H14O2PS2)2(C12H10N4)] |
Mr | 695.47 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 98 |
a, b, c (Å) | 8.661 (2), 8.753 (2), 11.159 (3) |
α, β, γ (°) | 88.110 (8), 81.502 (7), 89.813 (10) |
V (Å3) | 836.2 (4) |
Z | 1 |
Radiation type | Mo Kα |
µ (mm−1) | 0.96 |
Crystal size (mm) | 0.50 × 0.08 × 0.05 |
Data collection | |
Diffractometer | Rigaku AFC12K/SATURN724 |
Absorption correction | Multi-scan (ABSCOR; Higashi, 1995) |
Tmin, Tmax | 0.794, 1 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 7552, 3810, 3555 |
Rint | 0.036 |
(sin θ/λ)max (Å−1) | 0.650 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.043, 0.111, 1.09 |
No. of reflections | 3810 |
No. of parameters | 178 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.63, −0.70 |
Computer programs: CrystalClear (Rigaku/MSC 2005), SHEXLS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), DIAMOND (Brandenburg, 2006).
Ni—S1 | 2.4827 (7) | Ni—N1 | 2.1051 (19) |
Ni—S2 | 2.4835 (7) | ||
S1—Ni—S2 | 82.46 (2) |
D—H···A | D—H | H···A | D···A | D—H···A |
C8—H8···S2i | 0.95 | 2.77 | 3.694 (3) | 164 |
Symmetry code: (i) x, y−1, z. |
Acknowledgements
The authors gratefully thank the MBRS–RISE program (GM60655) for support. Cheminova is also thanked for the gift of the dithiophosphate used in this study.
References
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Interest in molecules related to the title compound (I) revolve around intriguing crystal engineering possibilities whereby different supramolecular topologies may be constructed by careful choice of organic substituents and bridging ligands (Lai & Tiekink, 2004; Chen et al., 2006; Aragoni et al., 2007). The Ni atom in (I), Fig. 1, lies on a crystallographic centre of inversion and the bis(4-pyridylmethylene)diazane molecule is similarly disposed about a centre of inversion. The Ni atom exists within an octahedral trans-N2S4 donor set defined by two symmetrically chelating dithiophosphate ligands and two trans-disposed pyridine-N atoms, Table 1. The bridging ligands lead to a linear polymer, Fig. 2, and these are arranged into layers, being connected by C—H···S contacts, Table 2 and Fig. 3. Layers interdigitate to consolidate the crystal packing, Fig. 4.
A similar coordination geometry and linear supramolecular polymer were observed in the iso-butyl derivative of (I) which was characterized crystallographically as a di-toluene solvate (Berdugo & Tiekink, 2008).