一种新颖的稀土-2-羟基烟酸的配合物的结构和光谱性质研究

Structural and Spectral Study of a Novel Lanthanide 2-hydroxynicotinic Acid Coordination Polymer

通过水热反应合成了一种新颖的稀土2-羟基烟酸的配合物{[LaL(HL)(H2O)3]1/3(SO4)2/3(H3O)2H2O}(H2L=2-hydroxynicotinic acid)。X-ray单晶衍射分析可知,2-羟基烟酸通过羧基O和羟基O原子桥连La离子,形成二维层状结构,层与层之间通过弱作用力拓展为三维结构。二维相关光谱分析表明N—H面外弯曲振动和C—H面外弯曲振动对磁微扰比较敏感,这可能是吡啶环上π电子云在磁微扰下变形引起C—H和N—H面外弯曲振动的响应,SO24-的ν4振动和羧基不对称伸缩振动对磁微扰也比较敏感;热微扰下N—H伸缩振动比较敏感。此外还对化合物进行了紫外和热重分析。

A novel lanthanide 2-hydroxynicotinic acid coordination polymer 1 {[LaL（HL）（H 2O）3]1/3（SO4）2/3（H3O）2H2O}（H2L=2-hydroxynicotinic acid） has been synthesized under hydrothermal condition and characterized by crystal X-ra y diffraction,IR,UV,TGA,two-dimensional infrared（2D IR） correlation spectr oscopy with magnetic and thermal perturbation.In 1,La ions are connected by 2-hydroxynicotinic acid through both carboxylate oxygen atoms and oxygen atoms from hydroxyl group in pyridine to generate a 2D layer in the ab plane,these l ayers are further connected by weak interactions to form a 3D framework along c axis.The response of out-of-plane bending vibrations of N—H and C—H are re markable in the 2D IR correlation spectra under magnetic perturbation,this may attributes to the inducement of π-electron cloud deformation under magneti c perturbation,ν4 vibrations from SO2-4 was also sensitive to ma gnetic perturbation.In addition,stretching vibrations from N—H are sensitive to thermal perturbation.