维生素B3与8-羟基喹啉稀土三元配合物的红外光谱研究  

Study on Infrared Spectra of the Ternary Complexes of Rare Earth with Vitamin B3 and 8-Hydroxylquinoline

作　　者：李爱桃 姚飞虹[1,2] 李明 肖仕清[1,2] 李强国[1,2] 肖圣雄 

机构地区：[1]湘南稀贵金属配合物及其应用湖南省重点实验室,湖南郴州423000 [2]湘南学院化学与生命科学系,湖南郴州423000

出　　处：《湘南学院学报》2012年第2期39-44,共6页Journal of Xiangnan University

基　　金：国家自然科学基金项目(20973145);湖南省教育厅科研项目(11C1171;07C701);湘南学院科研项目(2010Y061)

摘　　要：通过对比红外光谱图,归属新型维生素B3(C6H5NO2,HL)与8-羟基喹啉(C9H7NO,Hhq)稀土配合物的特征吸收,发现HL的羧基完全脱质子以酸根的形式与稀土离子配位,吡啶环的氮原子未参加配位,Hq-的羟基氧和杂氮原子与RE3+离子双齿配位,形成五元螯环,结合元素分析与热重分析的结果,推测La、Ce和Nd的配合物中有两个水分子与RE3+配位,组成为REL2hq.2H2O(L=C6H4NO2-,hq=C9H7NO-),配位数为8,而Sm配合物中无结晶水,组成为SmL2.hq,配位数为6.In this article,by comparing the characteristic bands of IR spectra of the new ternary rare earth with vitamin B3 and 8-hydroxyquinoline coordination complexes as well as those of their free ligands vitamin B3（C6H5NO2,HL） and 8-hydroxyquinoline（C9H7NO,Hhq）,we have found that during the process of coordination,HL was bidentate-coordinated with rare earth ions（RE^3＋） through an acidic group which was formed by removing the proton,while the hydroxyl oxygen atom and heterocyclic nitrogen atom of hq-formed a five-membered chelate ring with RE^3＋ for coordination.From the results of elemental analysis and thermogravimetric analysis,we could speculate that there were two water molecules coordinated with RE^3＋ in the complexes.The results showed that the general molecular formula of the new ternary coordination complexes was [REL2·hq]·2H2O（RE = La,Ce,and Nd;L= C6H4NO2^-;hq = C9H7NO^-） and SmL2·hq,their coordination number was eight and six, respectively.

关 键 词：稀土 维生素B3 8-羟基喹啉 三元配合物 红外光谱 

分 类 号：O657.33[理学—分析化学] O614.33[理学—化学]