A trinuclear cyanamidonitrate–copper(II) complex bridged by imidazolato ligands
摘要:
Cyanamidonitrate (can(-) = NO2N(CN)(-)) forms with copper(II) ions and neutral base (Him = imidazole) a complex of the composition [Cu-3(Him)(8)(im)(2)(NO3)(2)(Can)(2)] where im stands for the imidazolato (deprotonated imidazole) ligand. The crystal structure reveals three Cu(II) atoms linked by two imidazolato groups in this trinuclear complex of the linear type [(can)(Him)(3)Cu(mu-im)Cu (Him)(2)(NO3)(2)(mu-im)Cu(Him)(3) (can)]. The terminal Cu atoms are pentacoordinated, whereas the central Cu atom has a strongly elongated octahedral coordination. The magnetic susceptibility measurements confirm that the exchange coupling constants of the adjacent Cu centers is strongly antiferromagnetic (J/hc = -115 cm(-1)). The magnetization per complex is M = 0.73 mu(B) at B = 5 T and T = 5 K, (C) 2005 Elsevier B.V. All rights reserved.
A trinuclear cyanamidonitrate–copper(II) complex bridged by imidazolato ligands
摘要:
Cyanamidonitrate (can(-) = NO2N(CN)(-)) forms with copper(II) ions and neutral base (Him = imidazole) a complex of the composition [Cu-3(Him)(8)(im)(2)(NO3)(2)(Can)(2)] where im stands for the imidazolato (deprotonated imidazole) ligand. The crystal structure reveals three Cu(II) atoms linked by two imidazolato groups in this trinuclear complex of the linear type [(can)(Him)(3)Cu(mu-im)Cu (Him)(2)(NO3)(2)(mu-im)Cu(Him)(3) (can)]. The terminal Cu atoms are pentacoordinated, whereas the central Cu atom has a strongly elongated octahedral coordination. The magnetic susceptibility measurements confirm that the exchange coupling constants of the adjacent Cu centers is strongly antiferromagnetic (J/hc = -115 cm(-1)). The magnetization per complex is M = 0.73 mu(B) at B = 5 T and T = 5 K, (C) 2005 Elsevier B.V. All rights reserved.