The solid complex of lithium perchlorate with 4 tert butylbenzo 15 crown 5（4 t BB15C5） has been prepared in iodobenzene. The composition of the solid was determined as Li（4 t BB15C5）ClO 4 and its melting point was 119121 ℃. The far IR shift of the complex is obvious. The far IR absorption band of the complex containing 100% 6Li can be found by extrapolation, resolving the difficulty in obtaining a sample of 100% 6Li up to now. A relative reduced partition function ratio, [（ s/s′）f ] org , being 1.045 is calculated. Since the [ （s/s′）f ] aq of lithium perchlorate in solid state had been obtained as 1.025 and may act as that in aqueous phase, the phase equilibrium separation factor α may be obtained as 1.019 by the quotient of 1.045/1.025 for the extractive system of （4 t BB15C5） C 6H 5I/LiClO 4 H 2O. The value of α is just equal to the value of intrinsic separation factor （1+ ε p） described previously. [WT5HZ]
Two reduced sequences of(s/s′)f (relative reduced partition function ratio) found in the present paper are LiSCN·B15C5>LiCCl3COO·B15C5 > LiClO4·B15C5 and LiClO4·4-mB15C5>LiClO4·B15C5>LiClO4·Ph15C5,respectively.These solid lithium complexes with crown ethers were separated from tetrahydrofuran for the first sequence and from 3-methyl-1-butanol for the second one,respectively.Acording to the analysis of the data obtained,an independent character of the three factors(solvents,anion of lithium salts,and the sidegroup of 15C5 series),playing a part in contribution to(s/s′)f,have been brought to light preliminarily.
