Synthesis of sulfido and oxo complexes of technetium(V) and rhenium(V) containing dithiolato and hydrotris(1-pyrazolyl)borato ligands. Crystal structures of dimeric bis(.mu.-ethane-1,2-dithiolato)bis(ethene-1,2-dithiolato)technetium(IV) and [hydrotris(1-pyrazolyl)borato](ethane-1,2-dithiolato)oxorhe