Bis(acetato-j 2 O,O 0 )bis(3,5-dimethyl-1H- pyrazole-jN 2 )copper(II) Yuliya M. Davydenko, a Igor O. Fritsky, a * Vadim O. Pavlenko, a Franc Meyer b and Sebastian Dechert b a National Taras Shevchenko University, Department of Chemistry, Volodymyrska Street 64, 01601 Kiev, Ukraine, and b Institut fu ¨ r Anorganische Chemie, Universita ¨t Go ¨ ttingen, Tammannstrasse 4, 37077 Go ¨ ttingen, Germany Correspondence e-mail: ifritsky@univ.kiev.ua Received 22 April 2009; accepted 21 May 2009 Key indicators: single-crystal X-ray study; T = 133 K; mean (C–C) = 0.003 A ˚ ; R factor = 0.032; wR factor = 0.071; data-to-parameter ratio = 16.7. In the title compound, [Cu(C 2 H 3 O 2 ) 2 (C 5 H 8 N 2 ) 2 ], the Cu II atom has a distorted tetragonal–bipyramidal geometry, with the equatorial plane formed by two N atoms belonging to two 3,5-dimethyl-1H-pyrazole ligands and two O atoms from two acetate anions. The second O atoms of the acetate groups provide elongated Cu—O axial contacts, so that the acetates appear to be coordinated in a pseudo-chelate fashion. The pyrazole ligands are situated in cis positions with respect to each other. In the crystal structure, molecules are linked through intermolecular N—HO hydrogen bonds, forming a one-dimensional chain. Related literature For properties and applications of 1H-pyrazole and its 3,5- substituted derivatives, see: Fritsky et al. (1993, 1994a,b); Halcrow (2001); Jain et al. (2004); Kra ¨mer (1999); Kra ¨mer et al. (2002); Raptis et al. (1999); Seredyuk et al. (2007); Skopenko et al. (1990). For related compounds, see: Barooah et al. (2006); Deka et al. (2006); Karmakar et al. (2007); Porai- Koshits (1980); Pradeep et al. (2006). Experimental Crystal data [Cu(C 2 H 3 O 2 ) 2 (C 5 H 8 N 2 ) 2 ] M r = 373.90 Triclinic, P 1 a = 9.2861 (11) A ˚ b = 10.1684 (12) A ˚ c = 10.3139 (13) A ˚ = 110.755 (9) = 100.901 (10) = 99.383 (9) V = 865.7 (2) A ˚ 3 Z =2 Mo K radiation = 1.29 mm 1 T = 133 K 0.50 0.08 0.07 mm Data collection Stoe IPDSII diffractometer Absorption correction: numerical (X-RED; Stoe & Cie, 2002) T min = 0.790, T max = 0.935 7882 measured reflections 3713 independent reflections 3129 reflections with I >2(I) R int = 0.029 Refinement R[F 2 >2(F 2 )] = 0.032 wR(F 2 ) = 0.071 S = 1.02 3713 reflections 222 parameters H atoms treated by a mixture of independent and constrained refinement Á max = 0.29 e A ˚ 3 Á min = 0.66 e A ˚ 3 Table 1 Selected bond lengths (A ˚ ). Cu1—N1 1.9851 (18) Cu1—N3 1.9925 (16) Cu1—O1 1.9909 (15) Cu1—O2 2.4774 (18) Cu1—O3 2.0045 (14) Cu1—O4 2.4603 (16) Table 2 Hydrogen-bond geometry (A ˚ , ). D—HA D—H HA DA D—HA N2—H2O4 i 0.82 (3) 1.92 (3) 2.726 (3) 166 (3) N4—H4O2 ii 0.87 (3) 1.91 (3) 2.732 (2) 157 (2) Symmetry codes: (i) x þ 1; y; z; (ii) x þ 1; y þ 1; z þ 1. Data collection: X-AREA (Stoe & Cie, 2002); cell refinement: X-AREA; data reduction: X-RED (Stoe & Cie, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 1999); software used to prepare material for publication: SHELXL97. The authors thank the Ministry of Education and Science of Ukraine for financial support (grant No. M/42-2008). Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HY2196). References Barooah, N., Sarma, R. J. & Baruah, J. B. (2006). Eur. J. Inorg. Chem. pp. 2942– 2946. Brandenburg, K. (1999). DIAMOND. Crystal Impact GbR, Bonn, Germany. Deka, K., Laskar, M. & Baruah, B. J. (2006). Polyhedron, 25, 2525–2529. Fritsky, I. O., Lampeka,R. D., Kravtsov, V. Kh. & Simonov, Y. A. (1993). Acta Cryst. C49, 1041–1044. Fritsky, I. O., Lampeka, R. D., Skopenko, V. V., Simonov, Yu. A. & Dvorkin, A. A. (1994a). Russ. J. Inorg. Chem. (Engl. Transl.), 39, 771–776. metal-organic compounds Acta Cryst. (2009). E65, m691–m692 doi:10.1107/S1600536809019400 Davydenko et al. m691 Acta Crystallographica Section E Structure Reports Online ISSN 1600-5368