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在控制条件下,将七水氯化镧、水杨酸与维生素B3(烟酸)三种物质一起反应,从溶液中析出一种新型丝状稀土化合物,采用元素分析、化学分析、红外光谱、紫外光谱、摩尔电导、热重分析等一系列方法对合成的配合物的结构与性质进行表征,发现烟酸吡啶环上的N原子和水杨酸的酚羟基均未参与配位,烟酸和水杨酸都是脱质子后以羧酸根与镧离子配位,其反对称伸缩振动峰和对称伸缩振动峰均夹在离子型和共价型配合物的同类特征峰之间,说明稀土与羧酸根的配位以离子性为主,兼有部分共价性。进而初步确定其组成为[La(C7H5O3)2(C6H4NO2).H2O]。
Under the controlled conditions, the lanthanum chloride heptahydrate, salicylic acid and vitamin B3 (nicotinic acid) are reacted together to form a novel filamentous rare earth compound from the solution. Elemental analysis, chemical analysis, infrared spectroscopy, UV spectroscopy, molar conductance, thermogravimetric analysis and a series of methods to characterize the structure and properties of the synthesized complexes. It was found that both the N atom on the nicotinic acid pyridine ring and the phenolic hydroxyl group of salicylic acid did not participate in coordination, Salicylic acid are deprotonated by the carboxylate and lanthanum ions coordination, the anti-symmetrical stretching vibration peak and the symmetrical stretching vibration peak are clamped between ionic and covalent complexes of similar characteristics peak, indicating that rare earth and carboxylate The coordination of the main ion, both partial covalent. And then its composition was initially identified as [La (C7H5O3) 2 (C6H4NO2) .H2O].