SOLUTION CHEMISTRY OF ELEMENT-105 - PART-I - HYDROLYSIS OF GROUP 5 CATIONS - NB, TA, HA AND PA

Relativistic molecular orbital calculations of the electronic structur e of hydrated and hydrolyzed complexes have been performed for group 5 elements Nb, Ta, Ha and their pseudohomolog, Pa. On their basis, rela tive values of the free energy changes and constants of hydrolysis rea ctions were defined. These results show that hydrolysis decreases in t he order Nb > Ta > Ha much greater than Pa, which for Nh, Ta and Pa is in agreement with experiment. A decisive factor in the process turned out to be a predominant electrostatic metal-ligand interaction.