非化学计量胆红素钕的组成与配位作用  

Study on the Composition and Coordination of Non-Stoichiometric Neodymium Bilirubinate

作　　者：童晓滨 吴瑾光[2] 李维红[2] 翁诗甫[2] 申国荣[2] 顾燕恬[2] 徐光宪[2] 

机构地区：[1]甘肃张掖师专化学系 [2]北京大学化学系稀土中心,北京100871

出　　处：《兰州大学学报（自然科学版）》1993年第4期152-156,共5页Journal of Lanzhou University(Natural Sciences)

基　　金：国家重点实验室;国家自然科学基金

摘　　要：本研究工作在非水溶剂中,用不同原始比例(H_2BR∶Nd=1∶0.5～1∶3.0)的胆红素与金属离子合成了一系列胆红素钕络合物.金属钕的含量用 ICP 进行测试,发现并未得到确定组成的胆红素钕络合物.样品经 FT-IR 光谱测试,并与胆红素的红外光谱进行比较,其特征基团上光谱峰的强度及位置均发生了变化.据文献分析认为,合成的稀土化合物有类似胆红素钙的化学特性,钕离子也是随机地配位到胆红素分子的活性位置羧酸及 N-H 基团的原子上,并形成了非化学计量的胆红素钕络合物,并较好地解释了一些特殊的实验现象及结果.In this study,a series of neodymium bilirubinate were synthesized by re-actino NdCl_3 and bilirubin in different ratios(H_2BR:Nd=1∶0.5～1∶3.0)in non-aqucous solution.Nd contents of the bilirubinate precipitates were determined by ICPmeasurements.The result indicated that the neodymium bilirubinates of definite compo-sition have not been obtained.The FT-IR spectra of these samples were performed on aNicolet 7199B spectrometer.Compared with the speetrum of bilirubin,both band shiftsand intensity variations of the key bands showed that Nd^(3+)ions were coordinated to thecarboxyl and the NH group of bilirubin molecule,and Nd-bilirubinate complexes wereformed.It means that the chemical properly of Lanthanides is similar to that of calciumbilirubinate,the Nd^(3+)ions binding to the active sites of bilirubin molecule randomly toform a non-stoichiometric neodymium bilirubinates,and this explanation is accordantwith some peculiar experimental phenomena and a lot of date with this new idea.

关 键 词：胆红素 钕络合物 非化学计量 

分 类 号：O614.335[理学—无机化学]