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ISSN: 2056-9890

Bis(2,2′,2′′-nitrilo­triacetamide-κ3O,N,O′)cobalt(II) dinitrate tetra­hydrate

aCollege of Chemical Engineering, Huanggang Normal University, Huanggang 438000, People's Republic of China, and bCollege of Education Science and Technology, Huanggang Normal University, Huanggang 438000, People's Republic of China
*Correspondence e-mail: ranjw@126.com

(Received 21 December 2012; accepted 12 May 2013; online 18 May 2013)

In the centrosymmetric title compound, [Co(C6H12N4O3)2](NO3)2·4H2O, the CoII ion, lying on an inversion center, is O,N,O′-chelated by two nitrilo­triacetamide mol­ecules, forming a distorted octa­hedral geometry. In the crystal, extensive O—H⋯O and N—H⋯O hydrogen bonds link the complex cations, nitrate anions and lattice water mol­ecules into a three-dimensional network.

Related literature

For related structures, see: Kumari et al. (2012[Kumari, N., Ward, B. D., Kar, S. & Mishra, L. (2012). Polyhedron, 33, 425-434.]). For the synthesis of the ligand, see: Smith et al. (1995[Smith, D. A., Sucheck, S., Cramer, S. & Baker, D. (1995). Synth. Commun. 25, 4123-4132.]).

[Scheme 1]

Experimental

Crystal data
  • [Co(C6H12N4O3)2](NO3)2·4H2O

  • Mr = 631.41

  • Triclinic, [P \overline 1]

  • a = 8.4910 (17) Å

  • b = 9.1410 (18) Å

  • c = 9.2580 (19) Å

  • α = 91.55 (3)°

  • β = 96.03 (3)°

  • γ = 110.68 (3)°

  • V = 667.0 (2) Å3

  • Z = 1

  • Mo Kα radiation

  • μ = 0.73 mm−1

  • T = 293 K

  • 0.36 × 0.32 × 0.25 mm

Data collection
  • Siemens P4 diffractometer

  • Absorption correction: ψ scan (XSCANS; Siemens, 1994[Siemens (1994). XSCANS. Siemens Analytical X-ray Instruments Inc., Madison, Wisconsin, USA.]) Tmin = 0.779, Tmax = 0.838

  • 3692 measured reflections

  • 2301 independent reflections

  • 2185 reflections with I > 2σ(I)

  • Rint = 0.016

  • 2 standard reflections every 150 reflections intensity decay: none

Refinement
  • R[F2 > 2σ(F2)] = 0.028

  • wR(F2) = 0.080

  • S = 1.05

  • 2301 reflections

  • 191 parameters

  • 6 restraints

  • H atoms treated by a mixture of independent and constrained refinement

  • Δρmax = 0.32 e Å−3

  • Δρmin = −0.22 e Å−3

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A D—H H⋯A DA D—H⋯A
N2—H2A⋯O6i 0.86 2.26 3.026 (3) 149
N2—H2B⋯O3ii 0.86 1.96 2.816 (2) 173
N3—H3C⋯O8iii 0.86 2.11 2.958 (3) 168
N3—H3D⋯O5ii 0.86 2.16 3.001 (3) 166
N4—H4A⋯O7iv 0.86 2.20 2.992 (3) 152
N4—H4B⋯O7 0.86 2.30 3.045 (3) 145
O7—H7A⋯O6 0.88 (2) 2.05 (2) 2.877 (3) 156 (3)
O7—H7B⋯O8v 0.87 (2) 1.96 (2) 2.826 (3) 176 (3)
O8—H8A⋯O1i 0.85 (2) 2.14 (2) 2.976 (2) 166 (3)
O8—H8B⋯O6 0.85 (2) 2.16 (2) 2.980 (3) 161 (3)
O8—H8B⋯O5 0.85 (2) 2.42 (3) 3.078 (3) 134 (3)
Symmetry codes: (i) -x+1, -y+1, -z+2; (ii) -x+1, -y, -z+2; (iii) x+1, y, z+1; (iv) -x+1, -y, -z+1; (v) -x+1, -y+1, -z+1.

Data collection: XSCANS (Siemens, 1994[Siemens (1994). XSCANS. Siemens Analytical X-ray Instruments Inc., Madison, Wisconsin, USA.]); cell refinement: XSCANS; data reduction: XSCANS; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); molecular graphics: SHELXTL (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); software used to prepare material for publication: SHELXTL.

Supporting information


Comment top

Transition metal compounds have been of great interest for many years. They are very important in the development of coordination chemistry. As an extension of work on the structural characterization of Co compounds, we report here the crystal structure of a new mononuclear cobalt(II) compound.

The title compound consists of a [Co(NTA)2]2+ cation (NTA = nitrilotriacetamide), two nitrate anions and four solvent water molecules. The CoII atom has a distorted octahedral coordination environment (Fig. 1), which is centrosymmetric as the CoII atom occupies an inversion center. In the equatorial plane, the Co—N1 distance is 2.1696 (16) Å and the Co—O1 distance is 2.1057 (14) Å. The axial Co—O2 bond is appreciably shortened, which is 2.0329 (14) Å. In the crystal, extensive O—H···O and N—H···O hydrogen bonds (Table 1) link the complex cations, nitrate anions and lattice water molecules into a three-dimensional network (Fig. 2).

Related literature top

For related structures, see: Kumari et al. (2012). For the synthesis of the ligand, see: Smith et al. (1995).

Experimental top

The ligand was prepared according to the literature method (Smith et al., 1995). The title compound was synthesized by adding water solution of Co(NO3)2.6H2O (291 mg, 2 mmol) to a solution of the ligand (752 mg, 4 mmol) in methanol/water (v/v 3:1, 20 ml). The mixture was stirred for 30 min at room temperature. The solution was filtered and the filtrate was allowed to stand in air for 1 week, and pink crystals were formed at the bottom of the vessel on slow evaporation of the solvent at room temperature (yield: 30%).

Refinement top

H atoms on C and N atoms were positioned geometrically and refined as riding atoms, with C—H = 0.97, N—H = 0.86 Å, and with Uiso(H) = 1.2Ueq(C,N). The water H atoms were located from a difference Fourier map and refined with restraints of O—H = 0.86 (1) Å and Uiso(H) = 1.5Ueq(O).

Computing details top

Data collection: XSCANS (Siemens, 1994); cell refinement: XSCANS (Siemens, 1994); data reduction: XSCANS (Siemens, 1994); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (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 the complex cation in the title compound. Displacement ellipsoids are drawn at the 30% probability level. [Symmetry code: (A) 2-x, 1-y, 2-z.]
[Figure 2] Fig. 2. The packing diagram for the title compound, viewed down the a axis, with hydrogen bonds drawn as dashed lines.
Bis(2,2',2''-nitrilotriacetamide-κ3O,N,O')cobalt(II) dinitrate tetrahydrate top
Crystal data top
[Co(C6H12N4O3)2](NO3)2·4H2OZ = 1
Mr = 631.41F(000) = 329
Triclinic, P1Dx = 1.572 Mg m3
Hall symbol: -P 1Mo Kα radiation, λ = 0.71073 Å
a = 8.4910 (17) ÅCell parameters from 4804 reflections
b = 9.1410 (18) Åθ = 2.4–28.3°
c = 9.2580 (19) ŵ = 0.73 mm1
α = 91.55 (3)°T = 293 K
β = 96.03 (3)°Block, pink
γ = 110.68 (3)°0.36 × 0.32 × 0.25 mm
V = 667.0 (2) Å3
Data collection top
Siemens P4
diffractometer
2185 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tubeRint = 0.016
Graphite monochromatorθmax = 25.0°, θmin = 2.2°
ω scansh = 810
Absorption correction: ψ scan
(XSCANS; Siemens, 1994)
k = 106
Tmin = 0.779, Tmax = 0.838l = 1111
3692 measured reflections2 standard reflections every 150 reflections
2301 independent reflections intensity decay: none
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)] = 0.028H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.080 w = 1/[σ2(Fo2) + (0.0402P)2 + 0.3421P]
where P = (Fo2 + 2Fc2)/3
S = 1.05(Δ/σ)max = 0.001
2301 reflectionsΔρmax = 0.32 e Å3
191 parametersΔρmin = 0.22 e Å3
6 restraintsExtinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4
Primary atom site location: structure-invariant direct methodsExtinction coefficient: 0.036 (4)
Crystal data top
[Co(C6H12N4O3)2](NO3)2·4H2Oγ = 110.68 (3)°
Mr = 631.41V = 667.0 (2) Å3
Triclinic, P1Z = 1
a = 8.4910 (17) ÅMo Kα radiation
b = 9.1410 (18) ŵ = 0.73 mm1
c = 9.2580 (19) ÅT = 293 K
α = 91.55 (3)°0.36 × 0.32 × 0.25 mm
β = 96.03 (3)°
Data collection top
Siemens P4
diffractometer
2185 reflections with I > 2σ(I)
Absorption correction: ψ scan
(XSCANS; Siemens, 1994)
Rint = 0.016
Tmin = 0.779, Tmax = 0.8382 standard reflections every 150 reflections
3692 measured reflections intensity decay: none
2301 independent reflections
Refinement top
R[F2 > 2σ(F2)] = 0.0286 restraints
wR(F2) = 0.080H atoms treated by a mixture of independent and constrained refinement
S = 1.05Δρmax = 0.32 e Å3
2301 reflectionsΔρmin = 0.22 e Å3
191 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
Co11.00000.50001.00000.02488 (14)
O11.04636 (18)0.42993 (15)1.21011 (14)0.0357 (3)
N10.84838 (18)0.25174 (17)0.97367 (17)0.0255 (3)
O20.77965 (17)0.51316 (15)1.05517 (16)0.0358 (3)
N20.5284 (2)0.37589 (19)1.1249 (2)0.0385 (4)
H2A0.51400.46021.15310.046*
H2B0.45200.28601.13350.046*
C20.6662 (2)0.3843 (2)1.0691 (2)0.0279 (4)
C40.7310 (2)0.0285 (2)0.7776 (2)0.0309 (4)
C10.6803 (2)0.2307 (2)1.0199 (2)0.0344 (5)
H1A0.66070.16161.09900.041*
H1B0.59290.18100.93930.041*
C50.9455 (3)0.1821 (2)1.0737 (2)0.0311 (4)
H5A1.04170.17521.02980.037*
H5B0.87410.07721.09310.037*
C61.0065 (2)0.2848 (2)1.2144 (2)0.0320 (4)
C30.8369 (3)0.2003 (2)0.8196 (2)0.0319 (4)
H3A0.95080.22040.79570.038*
H3B0.78940.26420.76040.038*
O30.7098 (2)0.07085 (16)0.86712 (17)0.0436 (4)
N31.0164 (3)0.2180 (2)1.3353 (2)0.0498 (5)
H3C1.05140.27391.41650.060*
H3D0.98780.11781.33420.060*
N40.6714 (3)0.0027 (2)0.6381 (2)0.0481 (5)
H4A0.61380.09760.60530.058*
H4B0.69030.07200.58020.058*
O40.3650 (3)0.0756 (2)0.7431 (3)0.0729 (6)
N50.3013 (3)0.1744 (2)0.7124 (2)0.0490 (5)
O60.3922 (3)0.3140 (2)0.7051 (3)0.0790 (7)
O50.1443 (3)0.1328 (2)0.6828 (3)0.0753 (6)
O80.1387 (2)0.4513 (2)0.58788 (17)0.0494 (4)
O70.6172 (3)0.2799 (2)0.5059 (2)0.0606 (5)
H8A0.072 (4)0.470 (4)0.642 (3)0.091*
H8B0.195 (4)0.405 (4)0.637 (3)0.091*
H7A0.566 (4)0.319 (4)0.566 (3)0.091*
H7B0.689 (4)0.364 (3)0.475 (4)0.091*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Co10.0248 (2)0.0160 (2)0.0289 (2)0.00148 (14)0.00284 (14)0.00066 (13)
O10.0466 (8)0.0217 (7)0.0305 (7)0.0042 (6)0.0021 (6)0.0001 (5)
N10.0247 (8)0.0181 (7)0.0304 (8)0.0039 (6)0.0024 (6)0.0002 (6)
O20.0316 (7)0.0186 (7)0.0550 (9)0.0044 (6)0.0126 (6)0.0028 (6)
N20.0346 (9)0.0217 (8)0.0584 (11)0.0066 (7)0.0156 (8)0.0010 (8)
C20.0262 (9)0.0220 (9)0.0330 (10)0.0064 (8)0.0018 (7)0.0018 (7)
C40.0296 (10)0.0236 (9)0.0357 (11)0.0052 (8)0.0043 (8)0.0038 (8)
C10.0269 (10)0.0204 (9)0.0521 (12)0.0030 (8)0.0085 (9)0.0014 (8)
C50.0367 (10)0.0199 (9)0.0347 (10)0.0091 (8)0.0002 (8)0.0008 (7)
C60.0331 (10)0.0254 (10)0.0334 (10)0.0069 (8)0.0013 (8)0.0026 (8)
C30.0374 (11)0.0220 (9)0.0291 (10)0.0025 (8)0.0027 (8)0.0003 (7)
O30.0528 (9)0.0226 (7)0.0426 (9)0.0009 (6)0.0011 (7)0.0011 (6)
N30.0765 (14)0.0299 (9)0.0343 (10)0.0119 (9)0.0060 (9)0.0041 (8)
N40.0604 (12)0.0313 (9)0.0387 (10)0.0034 (9)0.0061 (9)0.0075 (8)
O40.0603 (12)0.0588 (12)0.1021 (17)0.0247 (10)0.0046 (11)0.0217 (11)
N50.0592 (13)0.0371 (11)0.0523 (12)0.0154 (10)0.0204 (10)0.0052 (9)
O60.0978 (16)0.0309 (9)0.0995 (16)0.0039 (10)0.0445 (13)0.0050 (10)
O50.0557 (12)0.0608 (12)0.1194 (19)0.0294 (10)0.0200 (12)0.0227 (12)
O80.0611 (11)0.0471 (10)0.0394 (9)0.0186 (8)0.0064 (8)0.0022 (7)
O70.0692 (13)0.0430 (10)0.0559 (11)0.0022 (9)0.0120 (9)0.0010 (8)
Geometric parameters (Å, º) top
Co1—O22.0329 (14)C5—C61.516 (3)
Co1—O12.1057 (14)C5—H5A0.9700
Co1—N12.1696 (16)C5—H5B0.9700
O1—C61.250 (2)C6—N31.299 (3)
N1—C31.472 (2)C3—H3A0.9700
N1—C51.478 (2)C3—H3B0.9700
N1—C11.482 (2)N3—H3C0.8600
O2—C21.251 (2)N3—H3D0.8600
N2—C21.307 (3)N4—H4A0.8600
N2—H2A0.8600N4—H4B0.8600
N2—H2B0.8600O4—N51.231 (3)
C2—C11.513 (3)N5—O61.245 (3)
C4—O31.225 (3)N5—O51.247 (3)
C4—N41.321 (3)O8—H8A0.85 (2)
C4—C31.524 (3)O8—H8B0.85 (2)
C1—H1A0.9700O7—H7A0.88 (2)
C1—H1B0.9700O7—H7B0.87 (2)
O2i—Co1—O2180.0N1—C1—C2112.43 (15)
O2i—Co1—O191.39 (7)N1—C1—H1A109.1
O2—Co1—O188.61 (7)C2—C1—H1A109.1
O2i—Co1—O1i88.61 (7)N1—C1—H1B109.1
O2—Co1—O1i91.39 (7)C2—C1—H1B109.1
O1—Co1—O1i180.0H1A—C1—H1B107.9
O2i—Co1—N198.08 (6)N1—C5—C6108.58 (15)
O2—Co1—N181.92 (6)N1—C5—H5A110.0
O1—Co1—N178.83 (6)C6—C5—H5A110.0
O1i—Co1—N1101.17 (6)N1—C5—H5B110.0
O2i—Co1—N1i81.92 (6)C6—C5—H5B110.0
O2—Co1—N1i98.08 (6)H5A—C5—H5B108.4
O1—Co1—N1i101.17 (6)O1—C6—N3122.53 (19)
O1i—Co1—N1i78.83 (6)O1—C6—C5119.19 (17)
N1—Co1—N1i180.00 (8)N3—C6—C5118.28 (17)
C6—O1—Co1113.26 (12)N1—C3—C4115.74 (16)
C3—N1—C5113.47 (15)N1—C3—H3A108.3
C3—N1—C1112.51 (15)C4—C3—H3A108.3
C5—N1—C1111.69 (16)N1—C3—H3B108.3
C3—N1—Co1107.54 (11)C4—C3—H3B108.3
C5—N1—Co1103.12 (11)H3A—C3—H3B107.4
C1—N1—Co1107.83 (11)C6—N3—H3C120.0
C2—O2—Co1115.18 (12)C6—N3—H3D120.0
C2—N2—H2A120.0H3C—N3—H3D120.0
C2—N2—H2B120.0C4—N4—H4A120.0
H2A—N2—H2B120.0C4—N4—H4B120.0
O2—C2—N2121.59 (17)H4A—N4—H4B120.0
O2—C2—C1121.70 (17)O4—N5—O6120.7 (2)
N2—C2—C1116.70 (16)O4—N5—O5119.5 (2)
O3—C4—N4124.06 (18)O6—N5—O5119.7 (2)
O3—C4—C3121.43 (17)H8A—O8—H8B108 (2)
N4—C4—C3114.46 (18)H7A—O7—H7B102 (2)
O2i—Co1—O1—C681.44 (15)Co1—O2—C2—N2169.65 (15)
O2—Co1—O1—C698.56 (15)Co1—O2—C2—C111.4 (2)
N1—Co1—O1—C616.52 (14)C3—N1—C1—C2118.18 (18)
N1i—Co1—O1—C6163.48 (14)C5—N1—C1—C2112.86 (18)
O2i—Co1—N1—C362.62 (13)Co1—N1—C1—C20.2 (2)
O2—Co1—N1—C3117.38 (13)O2—C2—C1—N17.4 (3)
O1—Co1—N1—C3152.44 (13)N2—C2—C1—N1173.64 (17)
O1i—Co1—N1—C327.56 (13)C3—N1—C5—C6158.56 (16)
O2i—Co1—N1—C557.55 (12)C1—N1—C5—C672.98 (19)
O2—Co1—N1—C5122.45 (12)Co1—N1—C5—C642.55 (17)
O1—Co1—N1—C532.27 (12)Co1—O1—C6—N3175.96 (18)
O1i—Co1—N1—C5147.73 (12)Co1—O1—C6—C54.6 (2)
O2i—Co1—N1—C1175.82 (12)N1—C5—C6—O134.3 (3)
O2—Co1—N1—C14.18 (12)N1—C5—C6—N3146.2 (2)
O1—Co1—N1—C186.00 (13)C5—N1—C3—C468.0 (2)
O1i—Co1—N1—C194.00 (13)C1—N1—C3—C460.0 (2)
O1—Co1—O2—C270.37 (14)Co1—N1—C3—C4178.61 (13)
O1i—Co1—O2—C2109.63 (14)O3—C4—C3—N125.6 (3)
N1—Co1—O2—C28.54 (14)N4—C4—C3—N1156.74 (18)
N1i—Co1—O2—C2171.46 (14)
Symmetry code: (i) x+2, y+1, z+2.
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N2—H2A···O6ii0.862.263.026 (3)149
N2—H2B···O3iii0.861.962.816 (2)173
N3—H3C···O8iv0.862.112.958 (3)168
N3—H3D···O5iii0.862.163.001 (3)166
N4—H4A···O7v0.862.202.992 (3)152
N4—H4B···O70.862.303.045 (3)145
O7—H7A···O60.88 (2)2.05 (2)2.877 (3)156 (3)
O7—H7B···O8vi0.87 (2)1.96 (2)2.826 (3)176 (3)
O8—H8A···O1ii0.85 (2)2.14 (2)2.976 (2)166 (3)
O8—H8B···O60.85 (2)2.16 (2)2.980 (3)161 (3)
O8—H8B···O50.85 (2)2.42 (3)3.078 (3)134 (3)
Symmetry codes: (ii) x+1, y+1, z+2; (iii) x+1, y, z+2; (iv) x+1, y, z+1; (v) x+1, y, z+1; (vi) x+1, y+1, z+1.

Experimental details

Crystal data
Chemical formula[Co(C6H12N4O3)2](NO3)2·4H2O
Mr631.41
Crystal system, space groupTriclinic, P1
Temperature (K)293
a, b, c (Å)8.4910 (17), 9.1410 (18), 9.2580 (19)
α, β, γ (°)91.55 (3), 96.03 (3), 110.68 (3)
V3)667.0 (2)
Z1
Radiation typeMo Kα
µ (mm1)0.73
Crystal size (mm)0.36 × 0.32 × 0.25
Data collection
DiffractometerSiemens P4
diffractometer
Absorption correctionψ scan
(XSCANS; Siemens, 1994)
Tmin, Tmax0.779, 0.838
No. of measured, independent and
observed [I > 2σ(I)] reflections
3692, 2301, 2185
Rint0.016
(sin θ/λ)max1)0.595
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.028, 0.080, 1.05
No. of reflections2301
No. of parameters191
No. of restraints6
H-atom treatmentH atoms treated by a mixture of independent and constrained refinement
Δρmax, Δρmin (e Å3)0.32, 0.22

Computer programs: XSCANS (Siemens, 1994), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).

Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N2—H2A···O6i0.862.263.026 (3)149
N2—H2B···O3ii0.861.962.816 (2)173
N3—H3C···O8iii0.862.112.958 (3)168
N3—H3D···O5ii0.862.163.001 (3)166
N4—H4A···O7iv0.862.202.992 (3)152
N4—H4B···O70.862.303.045 (3)145
O7—H7A···O60.88 (2)2.05 (2)2.877 (3)156 (3)
O7—H7B···O8v0.87 (2)1.96 (2)2.826 (3)176 (3)
O8—H8A···O1i0.85 (2)2.14 (2)2.976 (2)166 (3)
O8—H8B···O60.85 (2)2.16 (2)2.980 (3)161 (3)
O8—H8B···O50.85 (2)2.42 (3)3.078 (3)134 (3)
Symmetry codes: (i) x+1, y+1, z+2; (ii) x+1, y, z+2; (iii) x+1, y, z+1; (iv) x+1, y, z+1; (v) x+1, y+1, z+1.
 

Acknowledgements

This research was supported by the Huangzhou Scholar Fund (2012).

References

First citationKumari, N., Ward, B. D., Kar, S. & Mishra, L. (2012). Polyhedron, 33, 425–434.  Web of Science CSD CrossRef CAS
First citationSheldrick, G. M. (2008). Acta Cryst. A64, 112–122.  Web of Science CrossRef CAS IUCr Journals
First citationSiemens (1994). XSCANS. Siemens Analytical X-ray Instruments Inc., Madison, Wisconsin, USA.
First citationSmith, D. A., Sucheck, S., Cramer, S. & Baker, D. (1995). Synth. Commun. 25, 4123–4132.  CrossRef CAS Web of Science

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