ELECTRONIC-STRUCTURES OF HIGHLY SYMMETRICAL COMPOUNDS OF F-ELEMENTS -XXXI - SIMULATION OF THE CRYSTAL-FIELD SPLITTING PATTERN OF (THF)(3)LI(MU-CL)ND[N(SIME3)(2)](3)

The absorption spectra of an unoriented single crystal of the title co mpound (1) have been measured at room and at low temperatures. Assumin g a similar sequence of crystal field (CF) levels as for the previousl y analyzed Nd[N(SiMe3)(2)](3) (2) a truncated CF splitting pattern is derived from the spectra obtained. The parameters of an empirical Hami ltonian are fitted to the energies of 71 levels to give an r.m.s. devi ation of 24.2 cm(-1). The parameters obtained are compared with those of 2 and Nd[N(SiMe3)(2)](3)(CNC6H11)(2) (3). The observed trends of CF parameters are consistent with the results of simple model calculatio ns in the framework of the angular overlap model. (C) 1998 Elsevier Sc ience S.A.