{μ-trans-N,N′-Bis[2-(2-hydroxy­ethyl­amino)eth­yl]oxamidato(2−)}bis­[picrato­nickel(II)]

Tian, C.

doi:10.1107/S1600536809052933

Volume 66
Part 1
Page m71
January 2010

Received 10 November 2009
Accepted 9 December 2009
Online 16 December 2009

Key indicators
Single-crystal X-ray study
T = 298 K
Mean (C-C) = 0.005 Å
R = 0.035
wR = 0.087
Data-to-parameter ratio = 11.5
Details

{-trans-N,N'-Bis[2-(2-hydroxyethylamino)ethyl]oxamidato(2-)}bis[picratonickel(II)]

Chunliang Tian ^a ^*

^aDepartment of Chemistry, Jining University, Shandong 273155, People's Republic of China
Correspondence e-mail: chunliangtianjn@163.com

The title complex, [Ni₂(C₆H₂N₃O₇)₂(C₁₀H₂₀N₄O₄)], contains a centrosymmetric binuclear unit in which the oxamide ligand (located on a centre of symmetry) acts in a bis-tetradentate fashion and the picrate anion binds to nickel(II) in a bidentate mode. The Ni^II atom displays a distorted octahedral coordination with axial elongation. The binuclear molecules are linked by intermolecular N-HO, O-HO and C-HO hydrogen bonds into a two-dimensonal supramolecular network extending parallel to (100).

Related literature

For background to oxamido compounds and their complexes, see: Ruiz et al. (1999); Ojima & Nonoyama (1988).

Experimental

Crystal data

[Ni₂(C₆H₂N₃O₇)₂(C₁₀H₂₀N₄O₄)]
M_r = 833.93
Triclinic, $[P \overline 1]$
a = 7.7893 (16) Å
b = 8.1405 (16) Å
c = 12.417 (3) Å
= 98.00 (3)°
= 99.00 (3)°
= 94.36 (3)°
V = 766.2 (3) Å³
Z = 1
Mo K radiation
= 1.33 mm^-1
T = 298 K
0.19 × 0.14 × 0.10 mm

Data collection

Bruker SMART CCD diffractometer
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) T_min = 0.786, T_max = 0.879
4040 measured reflections
2703 independent reflections
2233 reflections with I > 2(I)
R_int = 0.015

Refinement

R[F² > 2(F²)] = 0.035
wR(F²) = 0.087
S = 1.23
2703 reflections
235 parameters
1 restraint
H-atom parameters constrained
_max = 0.39 e Å^-3
_min = -0.30 e Å^-3

Table 1
Selected bond lengths (Å)

N1-Ni1	1.903 (3)
N2-Ni1	2.032 (3)
O1-Ni1	1.991 (3)
O2-Ni1	2.537 (3)
O3-Ni1	1.942 (2)
O4-Ni1	2.561 (3)

Table 2
Hydrogen-bond geometry (Å, °)

D-HA	D-H	HA	DA	D-HA
N2-H2CO7ⁱ	0.91	2.15	3.054 (4)	171
O2-H2O1ⁱⁱ	0.86	2.34	3.084 (4)	145
C10-H10O5ⁱⁱⁱ	0.93	2.49	3.319 (5)	149
Symmetry codes: (i) -x, -y, -z+2; (ii) -x, -y, -z+1; (iii) x, y-1, z.

Data collection: SMART (Bruker, 1998); cell refinement: SAINT (Bruker, 1998); data reduction: SAINT; 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: SHELXL97 and PLATON (Spek, 2009).

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: SI2223 ).

Acknowledgements

We acknowledge the financial support of the Science Foundation of Shandong.

References

Bruker, (1998). SMART and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA.
Ojima, H. & Nonoyama, K. (1988). Coord. Chem. Rev. 92, 85-111.
Ruiz, R., Faus, J., Lloret, F., Julve, M. & Journaurx, Y. (1999). Coord. Chem. Rev. 193-195, 1069-1117.
Sheldrick, G. M. (1996). SADABS. University of Göttingen, Germany.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Spek, A. L. (2009). Acta Cryst. D65, 148-155.

metal-organic compounds