Spektroskopische Ermittlung der Wurzeln der mittleren Amplitudenquadrate einiger tetraedrischer Thioanionen und Chloroanionen von Elementen der Gruppen VA, VB, VIB, IIB und VIII des Periodensystems

摘要

The vibrational and structural analysis of a few thioanions and chloroanions of groups VA, VB, VIB, IIB, and VIII elements, such as AsS43−, SbS43−, VS43−, MoS42−, WS42−, HgCl42−, and FeCl42−is briefly described. These anions have a regular tetrahedral structure with the symmetry point group Td. On the basis of group theoretical considerations, the mean-square amplitudes, the generalized mean-square amplitudes (mean-square parallel amplitudes, mean-square perpendicular amplitudes, and mean cross products), and the root-mean-square amplitudes for both bonded and nonbonded atom pairs have been evaluated for these anions at the temperatures 298°K and 500°K by making use of the recent vibrational data. The behaviour of the root-mean-square amplitudes for both bonded and nonbonded atom pairs has been explained in terms of the electronegativities of the central atoms. A discussion of the results follows on the chemical significance of the characteristic bonds for all the thioanions a