VIBRATIONAL, NQR AND THERMOGRAVIMETRIC STUDY OF COMPLEXES BETWEEN TRIPHENYL GROUP VB COMPOUNDS AND MERCURIC HALIDES

Article abstract of DOI:10.1016/0022-2860(81)80035-X

The synthesis, identification, vibrational (IR-FIR), NQR and thermal (TGA) study of a series of donor-acceptor complexes (Ph3E^VB)_n(HgX2)_m (E^VB=As, Sb, Bi; Ph=phenyl; X=Cl, Br, I; n/m=2/2, 2/1) is reported.Elemental analysis proved that the aimed stoichiometry is only obtained for the (Ph3Sb)_n(HgI2)_m and (Ph3As)_n(HgX2)_m complexes, (Ph3As)2(HgI2)2 excepted.In all other cases a much lower Ph3E^VB content is found.Assignments for the skeletal vibrational frequencies are based upon a tetrahedral C_2V and a bridge-like C_2h symmetry for (Ph3E^VB)2HgX2 and (Ph3E^VB)(HgX2)2 complexes, respectively.Changes in the electron distribution of the Hg-X bond dominate the halogen NQR frequency.TG curves are characterized by a single step mass loss and the absence of any residue suggests volatilization rather than decomposition.