采用[(Tp)Fe(CN)3]^-(Tp=hydrotris(pyrazolyl)borate)与[NiL](ClO4)2(L=3,10-bis(2-hydroxyethyl)-1,3,5,8,10,12-hexaazacyclotetra-decane)反应,合成了氰根桥联的异金属三核配合物[NiL][(Tp)Fe(CN)3]2·4H2O (1),并对其结构和磁性进行了研究。该化合物晶体属于正交晶系,Pbca 空间群。配合物1中,Ni髤大环与2个[(Tp)Fe(CN)3]-通过氰根桥联,形成近似直线的三核结构。Ni原子的配位采取六配位稍畸变的八面体构型,其中大环配体上的4个N原子占据赤道平面而桥联氰根的2个N原子占据轴向位置。磁性测定表明在2-300 K的温度范围内,Ni髤和Fe髥之间通过桥联的氰根产生弱的铁磁相互作用。用哈密顿函数H=-2J(SFe1·SNi+SFe2·SNi)对其χMT-T曲线进行了拟合,得到1的朗德因子g=2.35和交换常数J=8.13 cm^-1。最后,对配合物的结构与磁性的关系进行了讨论。
Using [(Tp)Fe(CN)3]^- (Tp=hydrotris(pyrazolyl)borate) as a building block, one trinuclear complex [NIL] [(Tp)Fe(CN)3]2·4H2O (1) (L=3,10-bis(2-hydroxyethyl)-1,3,5,8,10,12-hexaazacyclotetradecane) was prepared and its structure and magnetic properties were studied. Complex 1 crystallizes in the orthorhombic system (Pbca), which consists of a neutral Ni^Ⅱ Fe ^Ⅲ2 complex and four H2O molecules. In the compound 1, the macrocyclic Ni^Ⅱ is coordinated by two [(Tp)Fe(CN)3]^- moieties through cyano-bridges in trans positions, resulting in a linear trinuclear structure. The Ni^Ⅱ ion adopts a slightly distorted octahedral, with four nitrogen atoms of the macrocyclic ligand L occupying the equatorial plane and two nitrogen atoms of two cyano-bridges situated at the axial sites. Magnetic studies for complex 1 show ferromagnetic coupling between the Nin and Fe^Ⅲ ions, giving a S=2 ground state. The best-fit forχMT vs T with a Hamiltonian H=-2J(SFe1·SNi+SFe2·SNi) leads to the parameters g=2.35, J=8.13 cm^-1 for 1. The correlations between the structures and the J values are discussed. CCDC: 675244.