Chloridotris(3,5-dimethyl-1H-pyrazole- jN 2 )(formato-jO)copper(II)–dichlorido- bis(3,5-dimethyl-1H-pyrazole-jN 2 )- copper(II) (2/1) Yuliya M. Davydenko, a Igor O. Fritsky, a * Vadim O. Pavlenko, a Franc Meyer b and Sebastian Dechert b ‡ a Department of Chemistry, National Taras Shevchenko University, Volodymyrska Str. 64, 01601 Kiev, Ukraine, and b Institut fu ¨ r Anorganische Chemie, Universita ¨t Go ¨ ttingen, Tammannstrasse 4, 37077 Go ¨ ttingen, Germany Correspondence e-mail: mihaylichenko85@mail.ru Received 19 April 2011; accepted 1 May 2011 Key indicators: single-crystal X-ray study; T = 120 K; mean (C–C) = 0.004 A ˚ ; R factor = 0.034; wR factor = 0.091; data-to-parameter ratio = 17.3. The asymmetric unit of the title compound, [Cu(CHO 2 )Cl- (C 5 H 8 N 2 ) 3 ] 2 [CuCl 2 (C 5 H 8 N 2 ) 2 ] or 2[A][B], contains one A molecule and one half-molecule of B, located on a centre of inversion. The Cu II environments in A and B are different. In A, the Cu II atom is coordinated by three N atoms from three 3,5-dimethyl-1H-pyrazole (L) ligands, one O atom from a formate ligand and a chloride anion in an axial position [Cu— Cl = 2.4275 (7) A ˚ ] in a distorted tetragonal–pyramidal geometry. The Cu II atom in B is coordinated by two N atoms from two L ligands and two chloride anions [Cu—Cl = 2.2524 (6) A ˚ ] in a distorted square-planar geometry. In the crystal, intermolecular N—HO hydrogen bonds link mol- ecules A into centrosymmetric dimers. Intermolecular N— HCl hydrogen bonds further link these dimers with the B molecules, forming chains propagating in [101]. Related literature For metal complexes with pyrazole and its derivatives, see: Trofimenko (1972); La Monica & Ardizzoia (1997); Casarin et al. (2005); Davydenko et al. (2009). For details of the bio- inorganic chemistry of copper complexes with pyrazole, see: Kra ¨ mer (1999); Raptis et al. (1999). For applications of copper complexes with pyrazole in molecular magnetism and supra- molecular chemistry, see: Kra ¨mer et al. (2002); Seredyuk et al. (2007). Experimental Crystal data [Cu(CHO 2 )Cl(C 5 H 8 N 2 ) 3 ] 2 - [CuCl 2 (C 5 H 8 N 2 ) 2 ] M r = 1191.53 Monoclinic, P2 1 =c a = 11.4457 (3) A ˚ b = 14.4720 (5) A ˚ c = 17.0313 (5) A ˚  = 106.650 (2)  V = 2702.82 (14) A ˚ 3 Z =2 Mo K radiation  = 1.42 mm 1 T = 120 K 0.50  0.27  0.19 mm Data collection Stoe IPDS II diffractometer Absorption correction: numerical (X-RED32; Stoe & Cie, 2002) T min = 0.554, T max = 0.763 36108 measured reflections 5749 independent reflections 4611 reflections with I >2(I) R int = 0.031 Refinement R[F 2 >2(F 2 )] = 0.034 wR(F 2 ) = 0.091 S = 1.01 5749 reflections 333 parameters H atoms treated by a mixture of independent and constrained refinement Á max = 0.72 e A ˚ 3 Á min = 0.83 e A ˚ 3 Table 1 Hydrogen-bond geometry (A ˚ ,  ). D—HA D—H HA DA D—HA N2—H2Cl1 0.82 (4) 2.74 (4) 3.270 (2) 124 (3) N2—H2Cl2 0.82 (4) 2.66 (4) 3.348 (2) 143 (3) N9—H9Cl1 0.79 (4) 2.30 (4) 3.081 (2) 168 (4) N7—H7O2 i 0.72 (4) 2.19 (4) 2.903 (3) 170 (4) N4—H4O2 i 0.87 (4) 1.98 (4) 2.850 (3) 176 (4) N4—H4O1 i 0.87 (4) 2.59 (4) 3.208 (3) 128 (3) Symmetry code: (i) x þ 1; y þ 1; z þ 1. Data collection: X-AREA (Stoe & Cie, 2002); cell refinement: X- AREA; data reduction: X-AREA; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 2001); software used to prepare material for publi- cation: SHELXL97. Financial support by the Visby Program through the Swedish Institute is gratefully acknowledged. Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: CV5078). References Brandenburg, K. (2001). DIAMOND. Crystal Impact GbR, Bonn, Germany. Casarin, M., Corvaja, C., Di Nicola, C., Falcomer, D., Franco, L., Monari, M., Pandolfo, L., Pettinari, C. & Piccinelli, F. (2005). Inorg. Chem. 44, 6265– 6276. metal-organic compounds m732 Davydenko et al. doi:10.1107/S1600536811016461 Acta Cryst. (2011). E67, m732–m733 Acta Crystallographica Section E Structure Reports Online ISSN 1600-5368 ‡ c/o Professor Franc Meyer.