| 基于[(Tp)Fe(CN)3]-氰根桥联异金属三核配合物的合成、晶体结构及磁性(英文) |
| Synthesis, Crystal Structure and Magnetic Properties of Linear Trinuclear Heterometallic Complex Based on [(Tp)Fe(CN)3]- |
|
| 摘要: 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(Ⅱ)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(Ⅱ)和Fe(Ⅲ)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。 |
| 关键词: 氰根桥联 异核配合物 铁(Ⅲ)配合物 镍(Ⅱ)配合物 磁性 |
| 基金项目: |
| Abstract: 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 NiⅡFeⅢ2 complex and four H2O molecules. In the compound 1, the macrocyclic NiⅡ is coordinated by two [(Tp)Fe(CN)3]- moieties through cyano-bridges in trans positions, resulting in a linear trinuclear structure. The NiⅡ 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 NiⅡ and FeⅢ ions, giving a S=2 ground state. The best-fit for χMT 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. |
| Keywords: cyano-bridged heterometallic complex iron(Ⅲ) complex nickel(Ⅱ) complex magnetic properties |
| |
| 摘要点击次数: 1275 |
| 全文下载次数: 2022 |
| 顾金忠,姜 隆,鲁统部,谭民裕.基于[(Tp)Fe(CN)3]-氰根桥联异金属三核配合物的合成、晶体结构及磁性(英文)[J].无机化学学报,2008,24(11):1743-1747. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
