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Background  Various dinuclear copper (II) complexes with octahedral geometry have been reported. The majority of these complexes contain N containing aromatic rings as axial ligands. There are also a few cases where the solvent used in the reaction occupies the axial position of the dinuclear copper (II) complex. This may occur by planned synthesis or some times by serendipity. Here we report some four copper (II) complexes containing solvent and or N containing heterocyclic ring as the axial ligand.    Results  Four compounds, each containing dinuclear Copper (II) units (with the most robust, frequently occurring paddle wheel structures) were synthesized and characterised by single crystal X-ray diffraction and by IR spectroscopy. The compounds 1 & 2 have the general formula Cu 2 (RCOO)  4 (L) 2  [(for (1) RCOO= 4-Chloro Benzoate, L= Isopropanol; for 2 RCOO= Benzoate, L= 2-Amino-4,6-dimethyl pyrimidine )] while 3 & 4 have the general formula, Cu 2 (RCOO)  4 (S) 2  Cu 2 (RCOO)  4 (L) 2  [RCOO=5-Chloro-thiophene-2-carboxylate L= 2-Amino-4,6-dimethyl pyrimidine, for 3 S= ethanol; for 4 S= methanol ]. A wide range of hydrogen bonds (of the O-H…O, N-H…O and N-H…N type) and π-π stacking interactions are present in the crystal structures.    Conclusions  All compounds contain the dinuclear units, in which two Cu (II) ions are bridged by four  syn ,  syn -η 1 :η 1 :μ carboxylates, showing a paddle-wheel cage type with a distorted octahedral geometry. The compounds  1  & 2  contain a single dimeric unit while  3  & 4  contain two dimeric units. The structures  3  and  4  are very interesting co-crystals of two paddle wheel molecules. Also it is interesting to note that the compounds  3  & 4  are isostructural with similar cell parameters. Both the compounds  3  & 4  differ in the solvent molecule coordinated to copper in one of the dimeric units. In all the four compounds, each of the copper dimers has an inversion centre. Every copper has a distorted octahedral centre, formed by four oxygen atoms (from different carboxylate) in the equatorial sites. The two axial positions are occupied by copper and the corresponding ligand.

Synthesis, characterization and X-ray structural studies of four copper (II) complexes containing dinuclear paddle wheel structures