“…There are reports in the literature on the electronic spectra and equilibria of a few complexes of n-and rdonors with v-acceptors. Thus, the spectra and equilibria of BF,-butene [125], AlC1,-aromatics [126], TiC1,-(or TiBr,-) aromatics [127], and VC1,-aromatics [128] have been reported. NQR spectroscopy has been employed to study SbCl, and SbBr, complexes [129], MBssbauer spectra of SnCl, complexes with aliphatic compounds have also been reported [130].…”