Transition metal complexes with pyrazole-based ligands. XXII. Di-mu-thiocyanato-bis[(3,5-dimethyl-1H-pyrazole-1-carboxamidine-kappa N-2,N )(thiocyanato-kappa N)copper(II)] and a redetermination of bis(3,5-dimethyl-1H-pyrazole-1-carboxamidine-kappa N-2,N )bis(nitrato-kappa O)-copper(II)
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The title Cu-II complex, [Cu-2(NCS)(4)(C6H10N4)(2)], represents the first crystal structure of a polynuclear transition metal complex with the 3,5-dimethyl-1H-pyrazole-1-carboxamidine ligand (HL). It is compared with previously reported crystal structures of metal complexes with the same HL ligand. The molecule contains an eight-membered binuclear Cu-2(NCS)(2) ring, which is centrosymmetric and in a chair conformation. The Cu atom has a distorted square-pyramidal geometry with a very elongated Cu-S bond of 2.993 (2) angstrom. The crystal structure redetermination of the bis(3,5-dimethyl-1H-pyrazole-1-carboxamidine-kappa(2)N,N) bis(nitrato-kappa O) copper(II) complex, [Cu(NO3)(2)(C6H10N4)(2)], and analysis of its hydrogen bonds confirm the significance of the NO3 groups in the formation of a three-dimensional hydrogen-bonding network. Both complexes are centrosymmetric, the inversion centre being located at the mid-point of the Cu center dot center dot center dot Cu line in (I) and the ...Cu atom being located at the inversion centre in (II).