Two pairs of 1 : 2 nickel(ii) and copper(ii) metal-complex dyes showing the same trans configuration and azo–hydrazone transformation but different thermal properties
作者:Xiao-Chun Chen、Yin-Ge Wang、Tao Tao、Jiao Geng、Wei Huang、Hui-Fen Qian
DOI:10.1039/c3dt50229e
日期:——
of 1 : 2 neutral trans mononuclear transition-metal (M = NiII and CuII) complexes of pyridine-2,4-dione and quinoline-2,4-dione based heterocyclic dyes have been structurally and spectrally characterized and compared herein. X-ray single-crystal diffraction analyses of four complexes, namely trans-[Ni(La)2(DMF)2] (1), trans-[Cu(La)2(DMF)2] (2), trans-[Ni(Lb)2(DMF)2] (3) and trans-[Cu(Lb)2(DMF)2] (4)
两对1:2的中性反式单核过渡金属(M = Ni II和Cu II)配合物吡啶-2,4-二酮 和 喹啉-2,4-二酮本文已经在结构和光谱上表征和比较了基于杂环的杂环染料。四种配合物的X射线单晶衍射分析,即反式-[Ni(L a)2(DMF)2 ](1),反式-[Cu(L a)2(DMF)2 ](2),反式-[Ni(L b)2(DMF)2 ](3)和反式-[Cu(L b)2(DMF)2 ](4),表明它们具有相同的反式双齿螯合双阴离子配体与两个轴向配位的DMF分子之间的构型。此外,由腙到偶氮结构的变换已经观察到两个二齿螯合配位体L一-和L b -后金属离子络合。更重要的是,同时DSC / TG-MS-FTIR方法已用于探索四种中性金属配合物染料1-4的热稳定性,其中Ni II和Cu II配合物中的两个轴向配位的DMF分子表现出明显的分解行为。由于它们不同的M-O键长来自于Jahn-Teller畸变。