Abstract: The invention concerns radiopharmaceutical products suitable for the selective labeling of lymphomas containing a metal complex with the formula: [M(R1CS2)(R1CS3)2] in which M is chosen from among 99mTc, 186Re and 188Re, and R1 represents an alkyl, cycloalkyl, aralkyl or aryl group, optionally substituted, obtained by reaction of a pertechnetate or a perrhenate with a reducing agent such as SnCl2ZP2O in the presence of a dithiocarboxylate having the formula: (R1CS2)−Z2+.

Abstract: The present invention relates to cardiac tropism radiopharmaceutical products incorporating a nitride complex os a transition metal and having a rapid myocardial clearance.These complexes are based on the formula:(M.tbd.N)L.sup.1 L.sup.2 (I)in which M is a transition metal such as .sup.99m Tc and L.sup.1 and L.sup.2 comply with the formula: ##STR1## in which at least one of the R and R' represents a branched alkyl group having one or more ether functions, a tetrahydrofurfuryl or ether group, a tetrahydrofurfuryl or dioxaspiro or dialkoxy piperidino groups.

Abstract: The invention concerns a radiopharmaceutical product having in particular a cerebral tropism comprising a nitruro complex of a transition metal and the method for preparing said product. This complex satisfies the formula (M.tbd.N)L.sup.1 L.sup.2 (I) in which M is a transition metal, such as Tc99m, Re 186 or Re188, and L.sup.1 and L.sup.2, which may be identical or different, satisfy the formula ##STR1## in which R.sup.1 and R.sup.2 may be alkyl radicals, V and W may be O, S or Se, n=0 or 1, l=0 or 1, m=0 or 1, and X represents N--C, C, or As.

Abstract: Process for the preparation of nitride complexes of transition metals for use as radiopharmaceutical products or for the synthesis of novel pharmaceutical products. The process consists in reacting an oxygenic transition metal compound such as 99m.sub.Tc, 186.sub.Re or 188.sub.Re, with a first nitrogenous ligand such as sodium nitride or a nitrogenous compound such as S-methyl, N-methyl dithiocarbazate, and a reducing agent consisting of either tin (II) or a dithionite. The product so obtained can be used for the preparation of radiopharmaceutical products by a reaction with a second ligand such as sodium dithiocarbamate.