Synthesis and Characterization of Cu(II) and Mono- and Dinuclear Pb(II) Complexes Derived from 3,5-Diacetyl-l,2,4-triazole

P. Souza3 *, A. I. Matesanz3, A. Arquerob, V. Fernandez3 a Departamento de Qmmica (C -V III), Facultad de Ciencias, Universidad Autönoma de Madrid, Cantoblanco, E-28049-Madrid, Spain b Departamento A.T.S.I., Facultad de Informätica, Universidad Politecnica de Madrid, Montegancedo s/n, E-28660-Boadilla del Monte, Madrid, Spain Z. Naturforsch. 49b, 665-671 (1994); received January 19, 1994 Triazole Hydrazones, Copper(II), Lead(II), Macro Ligand Template 1:1 condensation of 3,5-diacetyl-l,2,4-triazole with thiocarbohydrazide or carbohydrazide in the presence of 1 equivalent of Pb(SCN)2 produces mononuclear [2+1] com­ plexes 1 and 3. The analogous reaction with thiosemicarbazide and semicarbazide produces the dinuclear [1+2] complex 2 and the mononuclear metal free 4. The carbohydrazide deriva­ tive 3 reacts with the carbohydrazide or the 1,3-diaminopropane to yield the macrocyclic dinuclear complexes 5 and 6. Direct reaction of 3,5-diacetyl-l,2,4-triazole with thiocarbohydrazide, carbohydrazide, thiosemicarbazide and semicarbazide leads to open [1+1] ligands L 1, L2, L3, L4, and closed [1+1] ligands (mesocyclic ligands) L5 and L6 were prepared by addition of 1 equivalent of LiOH to the reaction mixture. The reaction of open and mesocyclic [1+1] ligands with copper(II) salts gives [CuLX2] and [Cu2+L2_] complexes. All these compounds have been characterized by 'H NMR, IR, electronic and mass spectra and by analytical data.