希土冠醚配合物的研究 ⅩⅣ.镧系硝酸盐与2,3,14,15—四苯基—1,4,7,10,13,16,19,22—八氧—环廿四—2,14—二烯配合物的合成及性质研究

STUDIES ON RARE EARTH COORDINATION COMPOUNDS WITH CROWN ETHERXIV.SYNTHESES AND PROPERTIES OF RARE EARTH NITRATES WITH2,3,14,15-TETRAPHENYL-1,4,7,10,13,16,19,22-OCTAOXA-CYCLOTETRACOSA-2,14-DIENE

自Pedersen首先发现大环聚醚对碱金属和碱土金属离子的特殊配位作用以来,人们相继合成了一系列不同类型的希土冠醚配合物。并研究了它们的性质。为进一步探讨冠醚环系中引入不饱和双键和引进不同数目的取代基,及其孔穴直径与金属离子直径的相对大小对配合物稳定性的影响,在过去研究工作的基础上,我们合成了2,3,14,15。

Six solid complexes of the lanthanide (Ⅲ) nitrates with 2,3,14,15-tetraphenyl -1,4,7,10,13,16,19,22-octaoxa-cyc1o-tetracosa-2,14-dienc (TP24C8) have been prepared in acetonitrile.The composition of the complexes is as follows:Ln2·TP24C8·(NO3)6·nH2O (Ln=La,Ce,Pr,Gd,n=5;Ln = Nd,Sm,n = 1)All of the complexes have been characterized by elemental analysis ,IR ,UV spectra,DTA,TG and molar conductance. The stability constants of the complexes of TP24C8 and DB24C8 with lanthanide (Ⅲ) are determined by e.m.f. measuremeats in methanoLThe results show that the coordination ability of the DB24C8 is higher than that of TP24C8.