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Acta Cryst. (2008). E64, m597-m598    [ doi:10.1107/S1600536808008052 ]

Bis{2-[2-(isopropylammonio)ethyliminomethyl]-6-methoxyphenolato}nickel(II) dithiocyanate

H.-B. Ma, Y.-X. Jiang and J.-T. Lei

Abstract top

The title complex, [Ni(C13H20N2O2)2](NCS)2, consists of a centrosymmetric mononuclear four-coordinate nickel(II) complex cation and two thiocyanate anions. The Ni atom is located on an inversion center and is coordinated by two phenol O atoms and two imine N atoms from two equivalent Schiff base ligands, in a square-planar geometry. In the crystal structure, the amino H atoms are involved in N-H...O hydrogen bonds with the phenol and methoxy O atoms of the ligand, and in N-H...N hydrogen bonds with the N atoms of the thiocyanate anions, which sit above and below the Ni atom.

Comment top

Nickel(II) complexes derived from Schiff bases have been widely studied (Marganian et al., 1995). Some of them have been found to have pharmacological and antitumor properties (Harrop et al., 2003; Brückner et al., 2000; Ren et al., 2002). The thiocyanate ligand displays a number of coordination modes and has become one of the most extensively studied building blocks in the synthesis of complexes (Bogdanović et al., 2005; Schottenfeld et al., 2007; Abul-Haj et al., 2000), however, the thiocyanate group acting as a counterion in complexes has seldom been reported. We report herein the crystal structure of the title nickel(II) complex (I).

Complex (I) consists of a centrosymmetric mononuclear four-coordinated nickel(II) complex molecule and two thiocyanate anions (Fig. 1). The Ni atom is located on an inversion center and coordinated, by two phenolic O atoms and two imine N atoms from two equivalent Schiff base ligands, in a square planar geometry. The thiocyanate anions act as counterions and are not coordinate to the nickel(II) atom (Fig. 1). All the coordinate bond values are similar to those observed in other Schiff base nickel(II) complexes (Arıcı et al., 2005; Diao, 2007; Diao et al., 2007; Zhu et al., 2004; Van Hecke et al., 2007; de Castro et al., 2001).

In the crystal structure of (I) the amino H-atoms are involved in N-H···O hydrogen bonds with the phenolic and methoxy O atoms of the ligand, and in N-H···N hydrogen bonds with the N-atom of the thiocyanate anions, which sit above and below the nickel atom (Table 1).

Related literature top

For background on the chemistry of Schiff base nickel(II) complexes, see: Marganian et al. (1995). For their biological activity, see: Harrop et al. (2003); Brückner et al. (2000); Ren et al. (2002). For thiocyanate coordinated complexes, see: Bogdanović et al. (2005); Schottenfeld et al. (2007); Abul-Haj et al. (2000). For related structures, see: Arıcı et al. (2005); Diao (2007); Diao et al. (2007); Zhu et al. (2004); Van Hecke et al. (2007); de Castro et al. (2001).

Experimental top

3-Methoxysalicylaldehyde (1.0 mmol, 152.0 mg), N-isopropylethane-1,2-diamine (1.0 mmol, 122.2 mg), ammonium thiocyanate (1.0 mmol, 76.0 mg), and Ni(NO3)2.6H2O (0.5 mmol, 145.0 mg) were dissolved in methanol (50 ml). The mixture was stirred at reflux for 2h to give a reddish solution. After keeping the solution in air for a few days, red block-like crystals were formed.

Refinement top

H atoms were positioned geometrically and refined using a riding model with d(N—H) = 0.90 Å, Uiso = 1.2Ueq(N), and d(C—H) = 0.93 - 0.97 Å, Uiso = 1.2 or 1.5Ueq (C).

Computing details top

Data collection: SMART (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT (Bruker, 2007); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures top
[Figure 1] Fig. 1. The molecular structure of complex (I), with displacement ellipsoids drawn at the 30% probability level.
Bis{2-[2-(isopropylammonio)ethyliminomethyl]-6-methoxyphenolato}nickel(II) dithiocyanate top
Crystal data top
[Ni(C13H20N2O2)2](NCS)2Dx = 1.345 Mg m−3
Mr = 647.49Mo Kα radiation
λ = 0.71073 Å
Orthorhombic, PbcaCell parameters from 1440 reflections
a = 13.520 (2) Åθ = 2.3–24.6º
b = 9.810 (3) ŵ = 0.78 mm−1
c = 24.102 (3) ÅT = 298 (2) K
V = 3196.7 (12) Å3Block, red
Z = 40.23 × 0.22 × 0.20 mm
F000 = 1368
Data collection top
Bruker SMART CCD area-detector
diffractometer		3863 independent reflections
Radiation source: fine-focus sealed tube1895 reflections with I > 2σ(I)
Monochromator: graphiteRint = 0.110
T = 298(2) Kθmax = 28.3º
ω scansθmin = 1.7º
Absorption correction: multi-scan
(SADABS; Bruker, 2001)		h = −17→17
Tmin = 0.841, Tmax = 0.860k = −12→12
24542 measured reflectionsl = −31→31
Refinement top
Refinement on F2Secondary atom site location: difference Fourier map
Least-squares matrix: fullHydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.070H-atom parameters constrained
wR(F2) = 0.175  w = 1/[σ2(Fo2) + (0.0594P)2 + 2.0547P]
where P = (Fo2 + 2Fc2)/3
S = 1.01(Δ/σ)max = 0.001
3863 reflectionsΔρmax = 0.29 e Å−3
190 parametersΔρmin = −0.38 e Å−3
6 restraintsExtinction correction: none
Primary atom site location: structure-invariant direct methods
Crystal data top
[Ni(C13H20N2O2)2](NCS)2V = 3196.7 (12) Å3
Mr = 647.49Z = 4
Orthorhombic, PbcaMo Kα
a = 13.520 (2) ŵ = 0.78 mm−1
b = 9.810 (3) ÅT = 298 (2) K
c = 24.102 (3) Å0.23 × 0.22 × 0.20 mm
Data collection top
Bruker SMART CCD area-detector
diffractometer		3863 independent reflections
Absorption correction: multi-scan
(SADABS; Bruker, 2001)		1895 reflections with I > 2σ(I)
Tmin = 0.841, Tmax = 0.860Rint = 0.110
24542 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.0706 restraints
wR(F2) = 0.175H-atom parameters constrained
S = 1.01Δρmax = 0.29 e Å−3
3863 reflectionsΔρmin = −0.38 e Å−3
190 parameters
Special details top

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
xyzUiso*/Ueq
Ni10.00000.50000.50000.0503 (3)
O10.0862 (2)0.5589 (3)0.55717 (11)0.0595 (8)
O20.1713 (2)0.7110 (3)0.62919 (13)0.0679 (9)
S10.12952 (16)0.8799 (3)0.34887 (10)0.1446 (9)
N10.1017 (2)0.3634 (3)0.47434 (13)0.0462 (8)
N20.0395 (3)0.4013 (3)0.35925 (13)0.0511 (9)
H2A0.07400.47430.37100.061*
H2B−0.01970.40340.37630.061*
N30.1018 (5)0.6596 (5)0.4145 (3)0.123 (2)
C10.1838 (3)0.5537 (4)0.55731 (16)0.0479 (10)
C20.2397 (3)0.4670 (4)0.52411 (17)0.0474 (10)
C30.3429 (3)0.4673 (5)0.5277 (2)0.0566 (12)
H30.37990.40860.50560.068*
C40.3893 (3)0.5529 (5)0.5634 (2)0.0659 (13)
H40.45810.55430.56480.079*
C50.3353 (3)0.6389 (5)0.59804 (19)0.0610 (13)
H50.36780.69670.62260.073*
C60.2337 (3)0.6377 (4)0.59571 (17)0.0523 (11)
C70.2135 (4)0.8054 (5)0.6670 (2)0.0850 (16)
H7A0.25300.75730.69370.127*
H7B0.16170.85400.68570.127*
H7C0.25440.86870.64710.127*
C80.1937 (3)0.3693 (4)0.48742 (15)0.0493 (11)
H80.23490.30400.47170.059*
C90.0744 (3)0.2481 (4)0.43785 (17)0.0553 (11)
H9A0.00500.22670.44330.066*
H9B0.11260.16860.44840.066*
C100.0920 (3)0.2777 (4)0.37715 (17)0.0560 (11)
H10A0.16230.28920.37070.067*
H10B0.06970.20090.35510.067*
C110.0231 (4)0.4150 (5)0.29841 (17)0.0681 (14)
H11−0.01020.33230.28530.082*
C120.1198 (4)0.4270 (7)0.2686 (2)0.119 (2)
H12A0.15590.50370.28290.178*
H12B0.10800.43970.22970.178*
H12C0.15770.34530.27410.178*
C13−0.0449 (5)0.5349 (6)0.2881 (2)0.0964 (19)
H13A−0.10830.51720.30450.145*
H13B−0.05260.54810.24890.145*
H13C−0.01690.61550.30430.145*
C140.1096 (5)0.7465 (7)0.3872 (3)0.095 (2)
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Ni10.0405 (4)0.0602 (5)0.0501 (4)0.0056 (4)−0.0042 (4)−0.0156 (4)
O10.0406 (17)0.084 (2)0.0535 (18)0.0023 (15)0.0001 (14)−0.0189 (16)
O20.066 (2)0.069 (2)0.068 (2)−0.0026 (17)−0.0098 (17)−0.0192 (18)
S10.1218 (16)0.166 (2)0.1462 (18)0.0331 (15)0.0288 (14)0.0599 (16)
N10.049 (2)0.049 (2)0.0408 (19)−0.0021 (17)0.0034 (16)0.0038 (16)
N20.057 (2)0.052 (2)0.045 (2)0.0072 (18)0.0093 (17)−0.0007 (17)
N30.162 (5)0.062 (3)0.147 (5)0.011 (3)−0.065 (4)0.008 (3)
C10.046 (3)0.053 (2)0.045 (2)−0.002 (2)−0.004 (2)0.008 (2)
C20.049 (3)0.050 (3)0.043 (2)0.004 (2)0.001 (2)0.0088 (19)
C30.042 (3)0.067 (3)0.060 (3)0.004 (2)0.002 (2)0.007 (2)
C40.045 (3)0.082 (3)0.071 (3)−0.003 (3)−0.006 (2)0.014 (3)
C50.061 (3)0.063 (3)0.059 (3)−0.015 (2)−0.016 (2)0.017 (2)
C60.052 (3)0.052 (3)0.053 (3)−0.003 (2)−0.005 (2)0.008 (2)
C70.107 (4)0.069 (3)0.079 (4)−0.008 (3)−0.023 (3)−0.013 (3)
C80.054 (3)0.056 (3)0.038 (2)0.011 (2)0.0101 (19)0.0086 (19)
C90.071 (3)0.045 (2)0.051 (3)0.004 (2)0.003 (2)−0.001 (2)
C100.070 (3)0.048 (3)0.050 (3)0.012 (2)0.000 (2)−0.004 (2)
C110.095 (4)0.065 (3)0.044 (3)0.010 (3)−0.001 (3)−0.001 (2)
C120.141 (6)0.157 (6)0.058 (4)0.035 (5)0.041 (4)0.028 (4)
C130.137 (5)0.080 (4)0.072 (4)0.032 (4)−0.025 (4)0.007 (3)
C140.095 (4)0.075 (4)0.116 (5)0.015 (4)−0.039 (4)−0.022 (4)
Geometric parameters (Å, °) top
Ni1—O1i1.895 (3)C4—H40.9300
Ni1—O11.895 (3)C5—C61.374 (6)
Ni1—N1i2.017 (3)C5—H50.9300
Ni1—N12.017 (3)C7—H7A0.9600
O1—C11.320 (5)C7—H7B0.9600
O2—C61.371 (5)C7—H7C0.9600
O2—C71.418 (5)C8—H80.9300
S1—C141.624 (8)C9—C101.511 (5)
N1—C81.285 (5)C9—H9A0.9700
N1—C91.479 (5)C9—H9B0.9700
N2—C101.470 (5)C10—H10A0.9700
N2—C111.489 (5)C10—H10B0.9700
N2—H2A0.9000C11—C121.497 (7)
N2—H2B0.9000C11—C131.513 (7)
N3—C141.082 (7)C11—H110.9800
C1—C21.391 (6)C12—H12A0.9600
C1—C61.412 (5)C12—H12B0.9600
C2—C31.399 (6)C12—H12C0.9600
C2—C81.445 (6)C13—H13A0.9600
C3—C41.356 (6)C13—H13B0.9600
C3—H30.9300C13—H13C0.9600
C4—C51.393 (6)
O1i—Ni1—O1180.000 (1)O2—C7—H7C109.5
O1i—Ni1—N1i90.38 (13)H7A—C7—H7C109.5
O1—Ni1—N1i89.62 (13)H7B—C7—H7C109.5
O1i—Ni1—N189.62 (13)N1—C8—C2126.7 (4)
O1—Ni1—N190.38 (13)N1—C8—H8116.7
N1i—Ni1—N1180.00 (17)C2—C8—H8116.7
C1—O1—Ni1127.2 (3)N1—C9—C10112.9 (3)
C6—O2—C7118.2 (4)N1—C9—H9A109.0
C8—N1—C9115.0 (4)C10—C9—H9A109.0
C8—N1—Ni1123.7 (3)N1—C9—H9B109.0
C9—N1—Ni1121.4 (3)C10—C9—H9B109.0
C10—N2—C11115.8 (3)H9A—C9—H9B107.8
C10—N2—H2A108.3N2—C10—C9111.5 (3)
C11—N2—H2A108.3N2—C10—H10A109.3
C10—N2—H2B108.3C9—C10—H10A109.3
C11—N2—H2B108.3N2—C10—H10B109.3
H2A—N2—H2B107.4C9—C10—H10B109.3
O1—C1—C2124.4 (4)H10A—C10—H10B108.0
O1—C1—C6117.2 (4)N2—C11—C12110.4 (4)
C2—C1—C6118.3 (4)N2—C11—C13108.8 (4)
C1—C2—C3120.3 (4)C12—C11—C13113.0 (5)
C1—C2—C8121.6 (4)N2—C11—H11108.2
C3—C2—C8118.0 (4)C12—C11—H11108.2
C4—C3—C2120.2 (4)C13—C11—H11108.2
C4—C3—H3119.9C11—C12—H12A109.5
C2—C3—H3119.9C11—C12—H12B109.5
C3—C4—C5120.8 (4)H12A—C12—H12B109.5
C3—C4—H4119.6C11—C12—H12C109.5
C5—C4—H4119.6H12A—C12—H12C109.5
C6—C5—C4119.6 (4)H12B—C12—H12C109.5
C6—C5—H5120.2C11—C13—H13A109.5
C4—C5—H5120.2C11—C13—H13B109.5
O2—C6—C5125.9 (4)H13A—C13—H13B109.5
O2—C6—C1113.4 (4)C11—C13—H13C109.5
C5—C6—C1120.7 (4)H13A—C13—H13C109.5
O2—C7—H7A109.5H13B—C13—H13C109.5
O2—C7—H7B109.5N3—C14—S1175.4 (7)
H7A—C7—H7B109.5
Symmetry codes: (i) −x, −y+1, −z+1.
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
N2—H2B···O2i0.902.343.068 (5)138
N2—H2B···O1i0.901.882.664 (4)145
N2—H2A···N30.902.132.983 (6)158
Symmetry codes: (i) −x, −y+1, −z+1.
Table 1
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
N2—H2B···O2i0.902.343.068 (5)138
N2—H2B···O1i0.901.882.664 (4)145
N2—H2A···N30.902.132.983 (6)158
Symmetry codes: (i) −x, −y+1, −z+1.
references
References top

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