Modified methods to synthesize of 1,8-bis[2-(diphenylphosphoryl)phenoxy]-3,6-dioxaoctane (L). Crystal structure and vibration spectra of [LiL]ClO4·2C6H6

Abstract

Modified methods to synthesize, 1,8-bis[2-diphenylphosphoryl)phenoxy]-3,6-dioxaoctane phosphoryl podand (L), an effective complexing agent for the lithium cation, is reported. The possibility to use the phase-transfer catalysis and microwave irradiation is shown. The crystal structure of coordination complex [LiL]ClO 4 ·2C 6 H 6 is determined by X-ray diffraction analysis.Lithium compounds are used as components of compact energy sources [1]; metal lithium is used as a coolant in nuclear reactors, and isotope 6 Li is the only industrial source of tritium which is necessary for thermonuclear energetics. Lithium salts are used in psychiatry for reductive therapy of manic states and prevention of bipolar affective (manic-depressive) disorders [2]. Organic coordination compounds which are able to effectively and selectively bind the Li + cation are used for its analytical determination in technological and biological solutions and for practical recovery and purification of lithium salts from industrial solutions. However, only few complexing organic compounds for the effective binding of lithium cation are known. As a rule, they are crown ethers with the cavity of small radius [3] and phosphoryl podands; among the latter the most interesting are oligoethylene glycol diphenyl ethers ortho-substituted with diphenylphosphoryl I [4] or diphenylphosphorylmethyl groups II [5] (Scheme 1).The plot of stability constant logarithms of M + L complexes of phosphoryl podand I and II with lithium 2,4-dinitrophenolate (log K Li+ ) in THF-chloroform