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The interactions of polyhydrides of molybdenum and tungsten of the type MH 4 (dppe) 2 with proton donors of different protonation ability were studied with IR and UV spectroscopy in CH 2 Cl 2 It was found that the formation of a molecular hydrogen-bonded complex (OH M) (1) is the first stage of protonation. An ionic H-complex of the type M + H O -...