Mononuclear and binuclear rhenium(I) carbonyl complexes of 2,4,6-tris(2-pyridyl)-1,3,5-triazine (TPT), [{ReCl(CO)3}n(TPT)] (n = 1, 2), and the formation of mixed-metal compounds with Re-TPT-M (M = Mn-II, Co-II, Cu-II) bonds

The novel mononuclear complex [ReCl(CO)(3)(TPT)] has been isolated where th e triazine ligand is acting in a didentate chelate mode. The metalloligand properties of this Re(I) complex were demonstrated when it reacts didentall y either with the {ReCl(CO)(3)} fragment or with the [M(hfac)(2)] (M=Mn, Co , Cu; hfac=hexafluoroacetylacetonare ion) complexes, producing the homobinu clear [{ReCl(CO)(3)}(2)(TPT)] and the heterobimetallic [(CO)(3)ClRe(TPT)M(h fac)(2)] substances, respectively. In methanol solution the binuclear Re-TP T-Re complex forms the [{ReCl(CO)(3)}(2)(TPT)]. MeOH complex, where a metho xide group seems to be interacting with the acidic triazine ring and the ni trogen atom of the uncoordinated pyridyl group is protonated. In general, t he studies in solution of the dirhenium Re-TPT-Re complex show evidence of its interaction with the solvent molecules apparently in an acid-base fashi on. On the other hand, the mixed-metal Re-TPT-M derivatives show dissociati on reactions in solution generating the parent mononuclear [ReCl(CO)(3)(TPT )] compound and the [M(hfac)(2)] complexes. The systems under study were ch aracterized through IR, H-1 NMR and electronic spectroscopy, electrochemica l and magnetic moment measurements. (C) 1999 Elsevier Science Ltd. All righ ts reserved.