稀土冠醚类配合物的研究(ⅩⅪ)——稀土硫氰酸盐与1,8-亚辛基双(苯并-15-冠-5)双核固态配合物的合成与表征

Studies on the Complexes of Rare Earth and Crown Ethers(ⅩⅪ)——Synthesis and Characterization of the Binuclear Solid Complexes of Rare Earth Elements with 1,8-Octamethylene-Bis(B15C5)

已有的对不同类型双冠醚与碱金属配合物的研究工作表明,双冠醚可与半径比醚穴孔径大的碱金属阳离子发生协同配位作用,形成夹心式结构,熵效应比单冠醚有利,并在配位选择性及配位能力方面均比相应的单冠醚有所增强.然而,关于双冠醚对稀土金属配位行为的研究工作尚不多见.我们已研究了1,8-二羰基亚辛基双(苯并-15-冠-5)与稀土元素的固态配合物,结果表明轻重稀土元素与该双冠醚配体形成双核式和夹心式两种不同的结构,初步说明双冠醚能否对稀土元素发生协同配位作用.除了与金属离子的离子势。

The 2:1(M:L) binuclear solid complexes 2RE(SCN)3 · OBS ·nTHF·mH2O(RE = La, Nd, Eu, Dy, Er; OBS= 1,8-Octamethylene- bis(B15C5);n = 0, 1;m=1-4)were synthesized in THF. The composition and complexation manner of the complexes were established on the basis of elemental analysis, molar conductance,IR spectra. The thermal and fluorescent properties of the complexes were also studied.