The aim of our work was independent verification of the proposed from EPR e
xperiment uncommon nature of paramagnetic Mo(V) species lacking molybdenyl
oxygen. For this purpose quantum chemical DFT calculations have been carrie
d out for [MoO5H8](3+) cluster model of reduced MoO3. Good agreement betwee
n the energy level diagram elucidated from EPR data with calculated orbital
energies led to the conclusion that the structure of this: Mo(V) centre se
ems to be well founded.