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Nickel(II) complexes of 1,7-bis(benzimidazol-2-yl)-2,6-dithiaheptane (BBDHP). Crystal and molecular structure of [Ni2(BBDHP)2(μ-Cl)2]Cl2·5H2O·2EtOH and Ni(BBDHP)Br2·EtOH·ButOH

1993; Elsevier BV; Volume: 12; Issue: 9 Linguagem: Inglês

10.1016/s0277-5387(00)87188-0

1873-3719

Rosa Carballo, A. Castiñeiras, Wolfgang Hiller, Joachim Strähle,

Magnetism in coordination complexes

Abstract The synthesis and characterization by elemental analyses, mass, IR and electronic spectrometry and conductance and magnetic measurements of compounds with the general formula Ni(BBDHP)X2·nSolv. is reported [X = Cl, Br, I, ClO4 or NO3; Solv. = H2O, EtOH or ButOH; n = 2−5; BBDHP = 1,7-bis(benzimidazol-2-yl)-2,6-dithiaheptane]. The structures of [Ni(BBDHP)(μ-Cl)]2Cl2·5H2O·2EtOH (II) and Ni(BBDHP)Br2·EtOH· 1 2 ButOH (IV) were determined by single-crystal X-ray diffraction. A molecule of II exhibits a dimeric structure involving two approximately symmetrical chlorine bridges. In both complexes the nickel atom has an octahedral environment with cis coordination of the two halide ligands [av. NiCl = 241.6(1), av. NiBr = 256.9(9) pm] and the BBDHP in a symmetrical-cis arrangement [av. NiS = 243.6(2), av. NiN = 207.1(4) pm]. In both compounds the crystal packing is governed mainly by hydrogen bonds involving benzimidazole groups, halide atoms and water molecules.