节点文献
2,2’-二吡啶-3,3’,6,6’-四甲酸过渡金属配合物的构筑及其固态单晶—单晶转化反应、配体原位反应研究
【作者】 刘洋;
【导师】 刘萍;
【作者基本信息】 西北大学 , 材料化学, 2014, 硕士
【摘要】 吡啶羧酸类配体在形成配合物时表现出丰富多样的配位模式,可构筑不仅具有新颖结构和拓扑的配合物,并且这些配合物往往在磁性、吸附、光学及催化等方面展现出潜在的应用价值。因此,本文选用2,2’-二吡啶-3,3’,6,6’-四甲酸(H4L)作为有机配体,摸索其与过渡金属构筑配合物的条件。此外,对所合成配合物的性质做了系统地研究。本论文使用2,2’-二吡啶-3,3’,6,6’-四甲酸成功合成了十例配位聚合物:[CuL0.5]n(1),[CtuL’0.5(H2O)2]n(2),[Cu2L’(H2O)2]n(3)’[Cu2L’0.5(OH)2·H2O]n(n),[CuL0.5(phen)(H2O)]n(5),[Cu4L2(phen)2(H2O)4]n(6),[Ag8L2(4,4’-bipy)3(H2O)]n(7),[Zn2(H2L)2(H2O)4-4H2O]n(8),[Zn6L3(H2O)13·H2O]n(9),[Cd2L(H2O)5]n(10)。其中,配合物 1 是由配合物[(CuL0.5H2O)·H2O]n(la)的单晶通过加热,发生固态单晶-单晶转化后所得。结构测定表明配合物la在热驱动条件下,失去配位水后由原来的一维链转变为三维结构,伴随结构改变,磁性也由弱的反铁磁变为弱的铁磁。另外,研究发现配合物la和1均对咪唑啉的合成具有良好的催化作用。而研究发现,在配合物2-4自组装过程中,配体H4L发生原位反应,最终得到新配体H4L’与金属Cu(Ⅱ)离子构筑的三种配合物。进一步研究发现,反应温度和pH对该原位反应的发生起了重要作用。配合物5为0维双核铜配合物,而6是由重复的四核铜单元构成一维链。由d10电子组态的过渡金属构筑的配合物7-10具有荧光性质。
【Abstract】 The pyridine carboxylic acid ligands have been employed to construct coordination polymers with a great diversity of coordination modes and produce the novel structure and topology.In addition,the coordination polymers show potential application in the aspects of magnetic,adsorption,optical and catalytic properties.Therefore,this paper select 2,2’-bipyridine 3,3’,6,6’-tetracarboxylic acid(H4L)as organic ligand,fumbling with the optimum synthesis conditions of the transition metal coordination polymers.Furthermore,the properties of the coordination polymers have been studyed in detail.In this paper,we employed 2,2’-bipyridine-3,3’,6,6’tetracarboxylic acid and obtained ten complexes:[CuL0.5]n(1),[CuL’0.5(H2O)2]n(2),[Cu2L’(H20)2]n(3),[Cu2L’00.5(OH)2·H2O]n(4),[CuL0.5(phen)(H20)]n(5),[Cu4L2(phen)2(H20)4]n(6),[Ag8L2(4,4’-bipy)3(H20)]n(7),[Zn2(H2L)2(H20)4-4H20]n(8),[Zn6L3(H20),3·H20]n(9),[Cd2L(H20)5]n(10).Complex 1 is obtained by heating treatment of the complex[(CuL0.5H2O)-H2O]n(la)and induced by single crystal to single crystal transformation.Structure determination showed that 1 is a 3D structure when get from the dehydrated 1D structure 1a and magnetic analysis indicate 1 and la are weak ferromagnetic and antiferromagnetic,respectively.Furthermore,the complexes la and 1 show good selective catalysis on the synthesis of imidazoline.In the synthesis process of complexes 2-4,the 2,2’-bipyridine 3,3’,6,6’-tetracarboxylic acid showed in situ reaction and obtained new H4L’ ligand.The H4L’ and Cu(II)ions are empolyed to construct three new complexes.It was found that temperature and pH value are the main factors that induce in situ reaction.Complexes 5 and 6 are OD binuclear and 1D tetranuclear Cu(II)complexes,respectively.Complexes 7-10 are synthesized from transition metal containing a10 electron and possessed fluorescence properties.
【Key words】 Coordination polymer; Single crystal to single crystal transformation; Catalysis; Magnetism; Fluorescence;