SINTEZA ŞI STRUCTURA COMPUŞILOR COORDINATIVI AI CUPRULUI(II) CU TIOSEMICARBAZONA ALDEHIDEI 5-(METILENTRIMETILAMONIU)SALICILICE

Angela SÎRBU, Mihail SECU, Polina BOUROŞ*, Oleg PALAMARCIUC Universitatea de Stat din Moldova *Institutul de Fizică Aplicată al AŞM

Аннотация

SYNTHESIS AND STRUCTURE OF COORDINATION COMPOUNDS OF COPPER(II) WITH 5-(METHYLENETRIMETYLAMONIUM)SALICYLALDEHYDE THIOSEMICARBAZONE

5-(methylenetrimetylamonium)salicylaldehyde thiosemicarbazone in salt form ((H2L)Cl·1.5H2O) was synthesized, at the interaction of this with various salts of copper(II) in neutral media were obtained four compounds with the formula: [Cu(HL)Cl]Cl·2.25H2O (1), [Cu(HL)(Cl)(NO3)]·2H2O (2), [Cu(H2L)Cl]SO4·0.75H2O (3) and [Cu(HL)Cl]2ClO4·1.75H2O (4), investigated by single crystal X-ray diffraction. It was established that four copper compounds has an ionic form, composed from cationic complex [Cu(HL)Cl]+ and [Cu(H2L)Cl]2+, anions Cl-, ClO4 - and SO4 2- respectively, for compond with NO3 - anion the complex is molecular. All compounds contain water molecules of salvation. The ligand (HL)0/(H2L)+ in 1, 2, 3 / 4 is tridentate coordinated via set of donor atoms O, N, S with the geometry of bipolar ion, where the ligand is electroneutral but contains two ionic centres (Zwitterion) or in its protonated form respectively. The molar ratio of the combination Cu:(HL)0/(H2L)+ in these compounds is 1:1. As a result of coordination of organic ligand (HL)0/(H2L)+ is not only subjected of monodeprotonation, but also supports conformational changes. Keywords: coordination compound, copper(II), X-rays, thiosemicarbazones, cationic complex, Zwitterion.