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

Angela SÎRBU, Mihail SECU, Polina BOUROŞ, Oleg PALAMARCIUC

Abstract


A fost sintetizată clorura tiosemicarbazonei aldehidei 5-(metilentrimetilamoniu)salicilice în formă de sare ((H2L)Cl∙1.5H2O), iar la interacţiunea acesteia cu diferite săruri de cupru(II) în mediu neutru au fost obţinuţi patru compuşi cu formulele [Cu(HL)Cl]Cl∙2.25H2O (1), [Cu(HL)(Cl)(NO3)]∙2H2O (2), [Cu(H2L)Cl]SO4∙0.75H2O (3) şi [Cu(HL)Cl]ClO4∙1.75H2O (4), ce au fost stabilite cu ajutorul razelor X. Trei compuşi ai cuprului sunt compuşi ionici, formaţi din cationul complex [Cu(HL)Cl]+ ori [Cu(H­2L)Cl]2+, anionii fiind Cl-, ClO4- şi SO42- respectiv, iar compusul ce conţine anionul NO3- este un complex molecular. Toţi compuşii conţin molecule de apă de solvatare. Liganzii (HL)0/(H2L)+ în 1, 2, 4 / 3 coordinează tridentat prin setul de atomi donori O,N,S în formă de ion bipolar, singur fiind electroneutru, însă conţinând două centre ionice (Zwitter-ion) ori în forma sa protonată, respectiv. Raportul molar de combinare Cu:(HL)0/(H2L)+ în aceşti compuşi este 1:1. În rezultatul coordinării liganzii organici (HL)0/(H2L)+ suferă schimbări conformaţionale, iar primii sunt supuşi monodeprotonării.

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 SO42- 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.

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References


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