The Schiff base ligand in the title complex, [Ni(C
15H
22N
3S
2)
2], lost a proton from its tautomeric thiol form and coordinated to Ni(II)
via the mercapto S and β-N atoms. The geometry around the Ni atom is square planar with two equivalent Ni—N and Ni—S bonds. The two phenyl rings and the coordination moieties are in one plane forming an extensive electronic delocalization system. The structure is governed by C—H
S and C—H
N hydrogen bonds, leading to the formation of centrosymmetric dimers.
Supporting information
CCDC reference: 175976
Key indicators
- Single-crystal X-ray study
- T = 293 K
- Mean (C-C) = 0.004 Å
- R factor = 0.060
- wR factor = 0.144
- Data-to-parameter ratio = 20.9
checkCIF results
No syntax errors found
ADDSYM reports no extra symmetry
Alert Level C:
PLAT_710 Alert C Delete 1-2-3 or 2-3-4 (CIF) Linear Torsion Angle # 3
S1 -NI1 -S1 -C1 -29.00100.00 3.555 1.555 1.555 1.555
PLAT_710 Alert C Delete 1-2-3 or 2-3-4 (CIF) Linear Torsion Angle # 4
N1 -NI1 -N1 -C3 -83.00100.00 3.555 1.555 1.555 1.555
PLAT_710 Alert C Delete 1-2-3 or 2-3-4 (CIF) Linear Torsion Angle # 7
N1 -NI1 -N1 -N2 97.00100.00 3.555 1.555 1.555 1.555
0 Alert Level A = Potentially serious problem
0 Alert Level B = Potential problem
3 Alert Level C = Please check
The title compound was prepared by mixing equal volumes (25 ml) of ethanol
solution of nickel acetate (1 mmol) and the ligand (2 mmol). The mixture was
refluxed and stirred for 4 h. On cooling to room temperature, it yielded the
crystalline complex. Single crystals suitable for X-ray diffraction analysis
were obtained by slow evaporation of a dichloromethane solution of the complex
containing ethanol.
After checking their presence in the difference map, all H-atoms were
geometrically fixed and allowed to ride on the parent C atoms with C—H
distances 0.93–0.97 Å and isotropic displacement parameters.
Data collection: SMART (Siemens, 1996); cell refinement: SAINT (Siemens, 1996); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 1997); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL, PARST (Nardelli, 1995) and PLATON (Spek, 1990).
Bis[methyl-N
β-(dipropylaminophenyl-methylene)-dithiocarbazato]nickel(II)
top
Crystal data top
C30H44N6NiS4 | F(000) = 716 |
Mr = 675.66 | Dx = 1.327 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
a = 12.3394 (1) Å | Cell parameters from 8192 reflections |
b = 9.1468 (1) Å | θ = 1.8–28.3° |
c = 15.9725 (1) Å | µ = 0.85 mm−1 |
β = 110.335 (1)° | T = 293 K |
V = 1690.40 (3) Å3 | Block, black |
Z = 2 | 0.46 × 0.38 × 0.34 mm |
Data collection top
Siemens SMART CCD area detector diffractometer | 3992 independent reflections |
Radiation source: fine-focus sealed tube | 2918 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.084 |
Detector resolution: 8.33 pixels mm-1 | θmax = 28.0°, θmin = 1.8° |
ω scans | h = −15→16 |
Absorption correction: empirical (using intensity measurements) SADABS (Sheldrick, 1996) | k = −12→6 |
Tmin = 0.696, Tmax = 0.761 | l = −20→20 |
11381 measured reflections | |
Refinement top
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.060 | H-atom parameters constrained |
wR(F2) = 0.144 | w = 1/[σ2(Fo2) + (0.0713P)2] where P = (Fo2 + 2Fc2)/3 |
S = 0.95 | (Δ/σ)max = 0.001 |
3992 reflections | Δρmax = 0.94 e Å−3 |
191 parameters | Δρmin = −0.84 e Å−3 |
0 restraints | Extinction correction: SHELXTL, Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.057 (4) |
Crystal data top
C30H44N6NiS4 | V = 1690.40 (3) Å3 |
Mr = 675.66 | Z = 2 |
Monoclinic, P21/c | Mo Kα radiation |
a = 12.3394 (1) Å | µ = 0.85 mm−1 |
b = 9.1468 (1) Å | T = 293 K |
c = 15.9725 (1) Å | 0.46 × 0.38 × 0.34 mm |
β = 110.335 (1)° | |
Data collection top
Siemens SMART CCD area detector diffractometer | 3992 independent reflections |
Absorption correction: empirical (using intensity measurements) SADABS (Sheldrick, 1996) | 2918 reflections with I > 2σ(I) |
Tmin = 0.696, Tmax = 0.761 | Rint = 0.084 |
11381 measured reflections | |
Refinement top
R[F2 > 2σ(F2)] = 0.060 | 0 restraints |
wR(F2) = 0.144 | H-atom parameters constrained |
S = 0.95 | Δρmax = 0.94 e Å−3 |
3992 reflections | Δρmin = −0.84 e Å−3 |
191 parameters | |
Special details top
Experimental. The data collection covered over a hemisphere of reciprocal space by a
combination of three sets of exposures; each set had a different ϕ angle (0,
88 and 180°) for the crystal and each exposure of 10 s covered 0.3° in ω.
The crystal-to-detector distance was 4 cm and the detector swing angle was
-35°. Crystal decay was monitored by repeating fifty initial frames at the
end of data collection and analysing the intensity of duplicate reflections,
and was found to be negligible. |
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. |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top | x | y | z | Uiso*/Ueq | |
Ni1 | 0.0000 | 0.0000 | 0.0000 | 0.03322 (17) | |
S1 | 0.07597 (6) | −0.17208 (9) | 0.09564 (5) | 0.0586 (3) | |
S2 | 0.02769 (8) | −0.24872 (10) | 0.25595 (6) | 0.0718 (3) | |
N1 | −0.11607 (17) | 0.01273 (19) | 0.05512 (13) | 0.0344 (4) | |
N2 | −0.09958 (17) | −0.0604 (2) | 0.13666 (13) | 0.0393 (5) | |
N3 | −0.5968 (2) | 0.2124 (3) | 0.12795 (16) | 0.0546 (6) | |
C1 | −0.0111 (2) | −0.1453 (3) | 0.15804 (17) | 0.0424 (6) | |
C2 | −0.0739 (3) | −0.1897 (4) | 0.3059 (2) | 0.0799 (11) | |
H2A | −0.0604 | −0.2417 | 0.3608 | 0.120* | |
H2B | −0.1509 | −0.2091 | 0.2659 | 0.120* | |
H2C | −0.0648 | −0.0867 | 0.3178 | 0.120* | |
C3 | −0.2135 (2) | 0.0836 (3) | 0.02404 (16) | 0.0373 (5) | |
H3 | −0.2251 | 0.1287 | −0.0306 | 0.045* | |
C4 | −0.3071 (2) | 0.1062 (3) | 0.05703 (16) | 0.0376 (5) | |
C5 | −0.3112 (2) | 0.0700 (3) | 0.14163 (16) | 0.0435 (6) | |
H5 | −0.2489 | 0.0219 | 0.1827 | 0.052* | |
C6 | −0.4062 (2) | 0.1049 (3) | 0.16443 (18) | 0.0481 (6) | |
H6 | −0.4058 | 0.0806 | 0.2210 | 0.058* | |
C7 | −0.5037 (2) | 0.1762 (3) | 0.10453 (18) | 0.0443 (6) | |
C8 | −0.4996 (2) | 0.2105 (3) | 0.01970 (18) | 0.0472 (6) | |
H8 | −0.5626 | 0.2561 | −0.0223 | 0.057* | |
C9 | −0.4042 (2) | 0.1776 (3) | −0.00176 (17) | 0.0440 (6) | |
H9 | −0.4038 | 0.2038 | −0.0579 | 0.053* | |
C10 | −0.5984 (3) | 0.1880 (3) | 0.2183 (2) | 0.0532 (7) | |
H10A | −0.6456 | 0.2627 | 0.2318 | 0.064* | |
H10B | −0.5204 | 0.1978 | 0.2608 | 0.064* | |
C11 | −0.6449 (3) | 0.0395 (4) | 0.2296 (2) | 0.0637 (8) | |
H11A | −0.5938 | −0.0354 | 0.2214 | 0.076* | |
H11B | −0.7202 | 0.0261 | 0.1839 | 0.076* | |
C12 | −0.6557 (4) | 0.0205 (4) | 0.3214 (3) | 0.0787 (11) | |
H12A | −0.6904 | −0.0725 | 0.3241 | 0.118* | |
H12B | −0.7032 | 0.0972 | 0.3310 | 0.118* | |
H12C | −0.5804 | 0.0250 | 0.3667 | 0.118* | |
C13 | −0.7035 (2) | 0.2703 (3) | 0.0624 (2) | 0.0513 (7) | |
H13A | −0.7685 | 0.2371 | 0.0782 | 0.062* | |
H13B | −0.7123 | 0.2299 | 0.0043 | 0.062* | |
C14 | −0.7077 (3) | 0.4336 (3) | 0.0556 (2) | 0.0660 (8) | |
H14A | −0.6448 | 0.4675 | 0.0373 | 0.079* | |
H14B | −0.6972 | 0.4751 | 0.1138 | 0.079* | |
C15 | −0.8217 (3) | 0.4864 (4) | −0.0111 (3) | 0.0739 (10) | |
H15A | −0.8199 | 0.5909 | −0.0163 | 0.111* | |
H15B | −0.8837 | 0.4590 | 0.0090 | 0.111* | |
H15C | −0.8336 | 0.4427 | −0.0683 | 0.111* | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
Ni1 | 0.0262 (2) | 0.0395 (3) | 0.0365 (3) | 0.00074 (16) | 0.01411 (17) | −0.00199 (16) |
S1 | 0.0503 (4) | 0.0692 (5) | 0.0699 (5) | 0.0258 (3) | 0.0383 (4) | 0.0247 (4) |
S2 | 0.0574 (5) | 0.0944 (7) | 0.0720 (6) | 0.0304 (4) | 0.0331 (4) | 0.0435 (5) |
N1 | 0.0277 (9) | 0.0410 (11) | 0.0353 (10) | 0.0012 (7) | 0.0120 (8) | −0.0019 (7) |
N2 | 0.0354 (11) | 0.0476 (12) | 0.0380 (10) | 0.0049 (9) | 0.0165 (9) | 0.0035 (9) |
N3 | 0.0393 (12) | 0.0752 (16) | 0.0576 (14) | 0.0142 (11) | 0.0274 (11) | 0.0094 (12) |
C1 | 0.0348 (13) | 0.0476 (14) | 0.0476 (14) | 0.0029 (10) | 0.0179 (11) | 0.0063 (11) |
C2 | 0.060 (2) | 0.128 (3) | 0.062 (2) | 0.017 (2) | 0.0339 (17) | 0.040 (2) |
C3 | 0.0309 (12) | 0.0472 (14) | 0.0361 (12) | 0.0024 (10) | 0.0148 (10) | 0.0004 (10) |
C4 | 0.0291 (11) | 0.0463 (14) | 0.0400 (12) | 0.0034 (9) | 0.0153 (10) | 0.0009 (10) |
C5 | 0.0320 (12) | 0.0592 (16) | 0.0408 (13) | 0.0085 (11) | 0.0143 (10) | 0.0078 (11) |
C6 | 0.0403 (14) | 0.0653 (17) | 0.0443 (14) | 0.0111 (12) | 0.0218 (12) | 0.0107 (12) |
C7 | 0.0326 (12) | 0.0519 (15) | 0.0534 (15) | 0.0055 (10) | 0.0210 (11) | 0.0036 (11) |
C8 | 0.0343 (13) | 0.0599 (17) | 0.0491 (15) | 0.0115 (11) | 0.0164 (11) | 0.0087 (12) |
C9 | 0.0368 (13) | 0.0561 (16) | 0.0422 (13) | 0.0099 (11) | 0.0175 (11) | 0.0101 (11) |
C10 | 0.0441 (15) | 0.0673 (18) | 0.0572 (17) | 0.0043 (13) | 0.0291 (13) | −0.0042 (13) |
C11 | 0.066 (2) | 0.073 (2) | 0.0588 (19) | −0.0032 (17) | 0.0309 (17) | −0.0029 (16) |
C12 | 0.089 (3) | 0.089 (3) | 0.068 (2) | 0.003 (2) | 0.040 (2) | 0.0102 (18) |
C13 | 0.0336 (13) | 0.0604 (17) | 0.0645 (17) | 0.0040 (11) | 0.0232 (13) | −0.0037 (13) |
C14 | 0.0562 (19) | 0.0607 (19) | 0.080 (2) | 0.0016 (15) | 0.0224 (17) | −0.0140 (17) |
C15 | 0.063 (2) | 0.068 (2) | 0.088 (3) | 0.0190 (16) | 0.023 (2) | 0.0070 (17) |
Geometric parameters (Å, º) top
Ni1—N1i | 1.928 (2) | C6—H6 | 0.9300 |
Ni1—N1 | 1.928 (2) | C7—C8 | 1.408 (4) |
Ni1—S1 | 2.1667 (7) | C8—C9 | 1.369 (3) |
Ni1—S1i | 2.1667 (7) | C8—H8 | 0.9300 |
S1—C1 | 1.719 (2) | C9—H9 | 0.9300 |
S2—C1 | 1.746 (3) | C10—C11 | 1.509 (4) |
S2—C2 | 1.787 (3) | C10—H10A | 0.9700 |
N1—C3 | 1.303 (3) | C10—H10B | 0.9700 |
N1—N2 | 1.415 (3) | C11—C12 | 1.528 (4) |
N2—C1 | 1.285 (3) | C11—H11A | 0.9700 |
N3—C7 | 1.367 (3) | C11—H11B | 0.9700 |
N3—C13 | 1.466 (4) | C12—H12A | 0.9600 |
N3—C10 | 1.468 (4) | C12—H12B | 0.9600 |
C2—H2A | 0.9600 | C12—H12C | 0.9600 |
C2—H2B | 0.9600 | C13—C14 | 1.497 (4) |
C2—H2C | 0.9600 | C13—H13A | 0.9700 |
C3—C4 | 1.441 (3) | C13—H13B | 0.9700 |
C3—H3 | 0.9300 | C14—C15 | 1.519 (5) |
C4—C9 | 1.400 (3) | C14—H14A | 0.9700 |
C4—C5 | 1.409 (3) | C14—H14B | 0.9700 |
C5—C6 | 1.380 (3) | C15—H15A | 0.9600 |
C5—H5 | 0.9300 | C15—H15B | 0.9600 |
C6—C7 | 1.410 (4) | C15—H15C | 0.9600 |
| | | |
N1i—Ni1—N1 | 180.00 (8) | C7—C8—H8 | 119.6 |
N1i—Ni1—S1 | 94.02 (6) | C8—C9—C4 | 123.0 (2) |
N1—Ni1—S1 | 85.98 (6) | C8—C9—H9 | 118.5 |
N1i—Ni1—S1i | 85.98 (6) | C4—C9—H9 | 118.5 |
N1—Ni1—S1i | 94.02 (6) | N3—C10—C11 | 112.9 (2) |
S1—Ni1—S1i | 180.00 (4) | N3—C10—H10A | 109.0 |
C1—S1—Ni1 | 95.79 (9) | C11—C10—H10A | 109.0 |
C1—S2—C2 | 102.68 (14) | N3—C10—H10B | 109.0 |
C3—N1—N2 | 113.85 (19) | C11—C10—H10B | 109.0 |
C3—N1—Ni1 | 126.15 (16) | H10A—C10—H10B | 107.8 |
N2—N1—Ni1 | 120.00 (14) | C10—C11—C12 | 112.4 (3) |
C1—N2—N1 | 111.57 (19) | C10—C11—H11A | 109.1 |
C7—N3—C13 | 121.6 (2) | C12—C11—H11A | 109.1 |
C7—N3—C10 | 122.1 (2) | C10—C11—H11B | 109.1 |
C13—N3—C10 | 116.2 (2) | C12—C11—H11B | 109.1 |
N2—C1—S1 | 125.2 (2) | H11A—C11—H11B | 107.9 |
N2—C1—S2 | 120.58 (19) | C11—C12—H12A | 109.5 |
S1—C1—S2 | 114.21 (14) | C11—C12—H12B | 109.5 |
S2—C2—H2A | 109.5 | H12A—C12—H12B | 109.5 |
S2—C2—H2B | 109.5 | C11—C12—H12C | 109.5 |
H2A—C2—H2B | 109.5 | H12A—C12—H12C | 109.5 |
S2—C2—H2C | 109.5 | H12B—C12—H12C | 109.5 |
H2A—C2—H2C | 109.5 | N3—C13—C14 | 114.4 (2) |
H2B—C2—H2C | 109.5 | N3—C13—H13A | 108.7 |
N1—C3—C4 | 133.1 (2) | C14—C13—H13A | 108.7 |
N1—C3—H3 | 113.5 | N3—C13—H13B | 108.7 |
C4—C3—H3 | 113.5 | C14—C13—H13B | 108.7 |
C9—C4—C5 | 116.4 (2) | H13A—C13—H13B | 107.6 |
C9—C4—C3 | 115.4 (2) | C13—C14—C15 | 111.6 (3) |
C5—C4—C3 | 128.1 (2) | C13—C14—H14A | 109.3 |
C6—C5—C4 | 121.1 (2) | C15—C14—H14A | 109.3 |
C6—C5—H5 | 119.5 | C13—C14—H14B | 109.3 |
C4—C5—H5 | 119.5 | C15—C14—H14B | 109.3 |
C5—C6—C7 | 122.0 (2) | H14A—C14—H14B | 108.0 |
C5—C6—H6 | 119.0 | C14—C15—H15A | 109.5 |
C7—C6—H6 | 119.0 | C14—C15—H15B | 109.5 |
N3—C7—C8 | 121.6 (2) | H15A—C15—H15B | 109.5 |
N3—C7—C6 | 121.8 (2) | C14—C15—H15C | 109.5 |
C8—C7—C6 | 116.6 (2) | H15A—C15—H15C | 109.5 |
C9—C8—C7 | 120.9 (2) | H15B—C15—H15C | 109.5 |
C9—C8—H8 | 119.6 | | |
| | | |
N1i—Ni1—S1—C1 | 170.96 (11) | C9—C4—C5—C6 | −0.5 (4) |
N1—Ni1—S1—C1 | −9.04 (11) | C3—C4—C5—C6 | 177.2 (2) |
S1i—Ni1—S1—C1 | −29 (100) | C4—C5—C6—C7 | 0.8 (4) |
N1i—Ni1—N1—C3 | −83 (100) | C13—N3—C7—C8 | 8.5 (4) |
S1—Ni1—N1—C3 | −167.7 (2) | C10—N3—C7—C8 | −175.0 (2) |
S1i—Ni1—N1—C3 | 12.3 (2) | C13—N3—C7—C6 | −172.5 (3) |
N1i—Ni1—N1—N2 | 97 (100) | C10—N3—C7—C6 | 4.0 (4) |
S1—Ni1—N1—N2 | 11.62 (15) | C5—C6—C7—N3 | −179.0 (3) |
S1i—Ni1—N1—N2 | −168.38 (15) | C5—C6—C7—C8 | 0.0 (4) |
C3—N1—N2—C1 | 170.6 (2) | N3—C7—C8—C9 | 178.0 (3) |
Ni1—N1—N2—C1 | −8.8 (3) | C6—C7—C8—C9 | −1.1 (4) |
N1—N2—C1—S1 | −1.3 (3) | C7—C8—C9—C4 | 1.4 (4) |
N1—N2—C1—S2 | −179.82 (17) | C5—C4—C9—C8 | −0.6 (4) |
Ni1—S1—C1—N2 | 8.6 (2) | C3—C4—C9—C8 | −178.6 (2) |
Ni1—S1—C1—S2 | −172.86 (13) | C7—N3—C10—C11 | −89.9 (3) |
C2—S2—C1—N2 | −3.9 (3) | C13—N3—C10—C11 | 86.8 (3) |
C2—S2—C1—S1 | 177.50 (18) | N3—C10—C11—C12 | −175.1 (3) |
N2—N1—C3—C4 | 2.0 (4) | C7—N3—C13—C14 | −91.2 (3) |
Ni1—N1—C3—C4 | −178.6 (2) | C10—N3—C13—C14 | 92.1 (3) |
N1—C3—C4—C9 | −173.4 (3) | N3—C13—C14—C15 | −178.2 (3) |
N1—C3—C4—C5 | 8.9 (5) | | |
Symmetry code: (i) −x, −y, −z. |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
C3—H3···S1i | 0.93 | 2.44 | 3.073 (3) | 125 |
C5—H5···N2 | 0.93 | 2.33 | 2.897 (3) | 119 |
Symmetry code: (i) −x, −y, −z. |
Experimental details
Crystal data |
Chemical formula | C30H44N6NiS4 |
Mr | 675.66 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 293 |
a, b, c (Å) | 12.3394 (1), 9.1468 (1), 15.9725 (1) |
β (°) | 110.335 (1) |
V (Å3) | 1690.40 (3) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.85 |
Crystal size (mm) | 0.46 × 0.38 × 0.34 |
|
Data collection |
Diffractometer | Siemens SMART CCD area detector diffractometer |
Absorption correction | Empirical (using intensity measurements) SADABS (Sheldrick, 1996) |
Tmin, Tmax | 0.696, 0.761 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 11381, 3992, 2918 |
Rint | 0.084 |
(sin θ/λ)max (Å−1) | 0.661 |
|
Refinement |
R[F2 > 2σ(F2)], wR(F2), S | 0.060, 0.144, 0.95 |
No. of reflections | 3992 |
No. of parameters | 191 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.94, −0.84 |
Selected geometric parameters (Å, º) topNi1—N1 | 1.928 (2) | S2—C1 | 1.746 (3) |
Ni1—S1 | 2.1667 (7) | S2—C2 | 1.787 (3) |
S1—C1 | 1.719 (2) | | |
| | | |
N1i—Ni1—S1 | 94.02 (6) | N1—Ni1—S1 | 85.98 (6) |
| | | |
C2—S2—C1—N2 | −3.9 (3) | Ni1—N1—C3—C4 | −178.6 (2) |
Symmetry code: (i) −x, −y, −z. |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
C3—H3···S1i | 0.93 | 2.44 | 3.073 (3) | 125 |
C5—H5···N2 | 0.93 | 2.33 | 2.897 (3) | 119 |
Symmetry code: (i) −x, −y, −z. |
There has been continuous interest in the chemistry of the metal complexes of Schiff bases containing N and S donor atoms. The thio derivatives of the Schiff bases, RCHδb NNHCSSR', are known to coordinate readily with transition metals to give stable complexes, forming a long π-conjugated system by deprotonation on complex formation (Podhye & Kauffman, 1985; Tian et al., 1996), and also have been shown to possess biological activity (Martinez & Toscano, 1995; Pérez et al., 2001) and non-linear optical (NLO) properties (Zhao et al., 1989; Tian et al., 1996). As a part of our studies on these thio-Schiff-base–metal complexes, we report the title structure (I) which is nickel(II) complexed with S-methyl-dithiocarbazate derived from 4-(dipropylamino)benzaldehyde.
In the title complex (I), the asymmetric unit consists of one half of the complex molecule. The other one half is related by an inversion center at the Ni1 atom. The nickel atom is coordinated in a distorted trans square-planar geometry. The distortion is considered from the reduction of the Ni—N—S angle to 85.98 (6)° in the chelate ring (from the ideal value of 90°). The Schiff base losses a proton from its tautomeric thiol form and acts as a singly charged bidentate ligand coordinating to Ni1 via the mercapto S and β-N atoms. The Ni1 atom is displaced by 0.284 (1) Å from the plane through N1, N2, S1, C1. All bond distances in the side chain are intermediate between a single bond and a double bond. This has been documented before (Duan et al., 1998), indicating the high electron delocalization in the π-system of the whole molecule. The mean plane defined by the N1, N2, C1, S1 and S2 makes an angle of 14.2 (1)° with the plane of the phenyl ring, whereas in the uncoordinated molecule it is 5.55 (5)° (Fun et al., 1996).
In the crystal lattice, two intramolecular C—H···S and C—H···N form closed rings of S1A—Ni1—N1—C3—H3, N2—N1—C3—C4—C5—H5, and the molecules are stacked parallel in columns along the b axis (Fig. 2).