P. G. Centre of Chemistry (M. U.), College of Commerce, Patna-800 020 Manuscript received 19 January 1992, revised 6 July 1992, accepted 25 August 1992 Some low-valent organometallic complexes of Pd0, Pt0 and RhI have been prepared and their tentative structure are assigned using various physicochemical data All PdO and PtO compounds are tetrahedral but compounds of Int have square planar configuration. Oxidation state of metals in these compounds are determined iodometrically. The ligand 3-(4 pyridyl) 4-phenyl-1,2,4-triazole-5-thione interacts with its thione tautomeric form with PdO and PtO, but both thione and thiol tautomeric form reacts with Rh1 depending on the experimental conditions of the reaction. Metal-ligand vibrations in the far-infrared spectra of complexes have been reasonably assigned.