首页> 美国卫生研究院文献>Molecules >Pentacoordinate and Hexacoordinate Mn(III) Complexes of Tetradentate Schiff-Base Ligands Containing Tetracyanidoplatinate(II) Bridges and Revealing Uniaxial Magnetic Anisotropy
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Pentacoordinate and Hexacoordinate Mn(III) Complexes of Tetradentate Schiff-Base Ligands Containing Tetracyanidoplatinate(II) Bridges and Revealing Uniaxial Magnetic Anisotropy

机译:含四氰基铂盐(II)桥的四齿席夫碱配体的五配位和六配位Mn(III)配合物揭示了单轴磁各向异性

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摘要

Crystal structures and magnetic properties of polymeric and trinuclear heterobimetallic MnIII···PtII···MnIII coordination compounds, prepared from the Ba[Pt(CN)4] and [Mn(L4A/B)(Cl)] (>1a/>b) precursor complexes, are reported. The polymeric complex [{Mn(L4A)}2{μ4-Pt(CN)4}]n (>2a), where H2L4A = N,N’-ethylene-bis(salicylideneiminate), comprises the {Mn(L4A)} moieties covalently connected through the [Pt(CN)4]2− bridges, thus forming a square-grid polymeric structure with the hexacoordinate MnIII atoms. The trinuclear complex [{Mn(L4B)}2{μ-Pt(CN)4}] (>2b), where H2L4B = N,N’-benzene-bis(4-aminodiethylene-salicylideneiminate), consists of two [{Mn(L4B)} moieties, involving pentacoordinate MnIII atoms, bridged through the tetracyanidoplatinate (II) bridges to which they are coordinated in a trans fashion. Both complexes possess uniaxial type of magnetic anisotropy, with D (the axial parameter of zero-field splitting) = −3.7(1) in >2a and −2.2(1) cm−1 in >2b. Furthermore, the parameters of magnetic anisotropy >2a and >2b were also thoroughly studied by theoretical complete active space self-consistent field (CASSCF) methods, which revealed that the former is much more sensitive to the ligand field strength of the axial ligands.
机译:由Ba制备的聚合物和三核异双金属Mn III ···Pt II ···Mn III 配位化合物的晶体结构和磁性报告了[Pt(CN)4]和[Mn(L4A / B)(Cl)](> 1a / > b )前体复合物。聚合物络合物[{Mn(L4A)} 2 {μ 4 -Pt(CN)4}] n(> 2a ),其中H2L4A = N,N'-乙烯-bis(salicylideneineminate)包含通过[Pt(CN)4] 2-桥共价连接的{Mn(L4A)}部分,从而形成具有六坐标Mn < sup> III 原子。三核络合物[{Mn(L4B)} 2 {μ-Pt(CN)4}](> 2b ),其中H2L4B = N,N'-苯-双(4-氨基二乙烯-水杨酰亚胺) ,由两个[{Mn(L4B)}部分组成,涉及五配位的Mn III 原子,它们通过四氰基铂盐酸盐(II)桥桥接,并以反式方式与之键合。两种配合物均具有单轴磁各向异性,在> 2a 中D(-零场分裂的轴向参数)= -3.7(1),在> 2a 中为-2.2(1)cm -1 2b 中的sup>。此外,还通过理论上完整的有源空间自洽场(CASSCF)方法对磁各向异性> 2a 和> 2b 的参数进行了深入研究,结果表明前者要大得多。对轴向配体的配体场强度敏感。

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