Discrete and 1D coordination polymeric chloro-bridged copper(II) dimers exhibiting ferro-and antiferromagnetic exchange coupling : Magneto-structural correlations and non-covalent interactions
Discrete and 1D coordination polymeric chloro-bridged copper(II) dimers exhibiting ferro-and antiferromagnetic exchange coupling : Magneto-structural correlations and non-covalent interactions
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DOI：
10.1016/j.ica.2008.02.072
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发表时间：
2009
影响因子：
2.8
通讯作者：
Sukanta Mandal;F. Lloret;R. Mukherjee
中科院分区：
文献类型：
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作者：
Sukanta Mandal;F. Lloret;R. Mukherjee
本文合成并表征了两种具有重复{Cu2II(μ-Cl)2}单元的具有末端三叉（2-吡啶基）烷基胺（MHL=α，α′-双[N-（2-吡啶基乙基）-N-（2-吡啶基甲基）氨基]-m-二甲苯）和（2-吡啶基）烷基胺/吡唑（MPyPz=α，α′-双[N-（2-吡啶基乙基）-N-（1-吡啶基甲基）氨基]-二甲苯）配位的1维配位聚合物[Cu2(MHL)Cl2][ClO4]2·CH3CN(3·CH3CN)]。x射线晶体学研究表明，最近报道的三齿（2-吡啶基）烷基胺配体[MeL=甲基[2-（2-吡啶基）乙基]（2-吡啶基甲基）胺]、2·CH3CN·THF和3·CH3CN的二氯桥接离散{Cu2II(μ-Cl)2}配合物[{Cu(MeL)Cl}2][ClO4]2(1)中的铜（II）中心具有扭曲的方锥体几何形状，共享平行基面和基部到顶点的边缘。在2 - 300k范围内的变温磁化率测量表明，1 [J（单重态-三重态能隙）=−3.89cm−1]和2·CH3CN·THF （J=−1.84cm−1）耦合具有反铁磁性，3·CH3CN （J=+6.27cm−1）耦合具有铁磁性。这些配合物为磁结构相关性提供了有用的信息。
The synthesis and characterization of two 1D coordination polymers [Cu2(MHL)Cl2][ClO4]2·CH3CN·THF (2·CH3CN·THF) and [Cu2(MPyPz)Cl2][ClO4]2·CH3CN (3·CH3CN), having repetitive {Cu2II(μ-Cl)2} units, of m-xylyl-based ligands with terminal tridentate (2-pyridyl)alkylamine (MHL=α,α′-bis[N-(2-pyridylethyl)-N-(2-pyridylmethyl)amino]-m-xylene) and (2-pyridyl)alkylamine/pyrazole (MPyPz=α,α′-bis[N-(2-pyridylethyl)-N-(pyrazol-1-ylmethyl)amino]-m-xylene) coordination have been accomplished. X-ray crystallographic studies reveal that the copper(II) centers in the recently reported dichloro-bridged discrete {Cu2II(μ-Cl)2} complex [{Cu(MeL)Cl}2][ClO4]2(1) of a tridentate (2-pyridyl)alkylamine ligand [MeL=methyl[2-(2-pyridyl)ethyl](2-pyridylmethyl)amine], 2·CH3CN·THF, and 3·CH3CN have distorted square-pyramidal geometry, sharing a base-to-apex edge with parallel basal planes. Variable-temperature susceptibility measurements in the range of 2–300K reveal antiferromagnetic for 1 [J (singlet–triplet energy gap)=−3.89cm−1] and 2·CH3CN·THF (J=−1.84cm−1), and ferromagnetic for 3·CH3CN (J=+6.27cm−1) coupling. The complexes provide useful information for the magneto-structural correlations.