The formation of б-bond complexes, proposed as the key intermediate species in catalytic hydrogermylation, hydrosilylation and stannylation of norbornadiene in the presence of photochemically activated tungsten and molybdenum carbonyl complexes, has been recently identified mainly by the NMR spectroscopic method. The η2-coordination of the H-E bond to the transition metal can be observed in 1H NMR spectra due to the appearance of a high-field resonance. However, the structural properties of the resulting б-bond complexes in solution are sometimes difficult to describe because of their low stability. This is the reason why we decided to optimize the structure of the б-bond complex 1 and calculate the chemical shift of the proton of the η2-H-EEt3 bond, and next to compare these results with the available experimental data.