Synthesis and structure of copper(II) complexes: Potential cyanide sensor and oxidase model

• DOI: 10.1007/s12039-016-1063-7
• Publication Date: 2016-04-05T06:48:01Z
• Authors: PALASH MONDAL; SANKAR PRASAD PARUA; POULAMI PATTANAYAK; UTTAM DAS; SURAJIT CHATTOPAD...
• Keywords: 01 natural sciences; 0104 chemical sciences

The new complexes of compositions [(La)2Cu] and [(Lb)2Cu] were prepared by treating with 2-hydroxy-5-methyl-3-(2-aryldiazenyl)phenylimino) methyl) benzaldehyde (HLa) and ethyl-2-cyano-3-(2-hydroxy-5-methyl-3-(-(2-aryldiazenyl) phenylimino) methyl) phenyl) acrylate (HLb) ligands [where aryl is phenyl for HL $_{\mathrm {a}}^{\mathrm {~1 } }$ and HL $_{\mathrm {b}}^{~1}$ ; p-methyl phenyl for HL $_{\mathrm {a}}^{\mathrm {~2 } }$ and HL $_{\mathrm {b}}^{~2}$ ; and p-chloro phenyl for HL $_{\mathrm {a}}^{\mathrm {~3 } }$ and HL $_{\mathrm {b}}^{~3}$ ] with Cu(OAc)2.H2O, respectively. Both the bis copper(II) complexes consist of tridentate (N,N,O) anionic ligands, L $_{\mathrm {a}}^{\mathrm {~-}}$ or L $_{\mathrm {b}}^{\mathrm {~-}}$ . X-ray structures of the representative complexes [(L $_{\mathrm {a}}^{~1})_{2}$ Cu] and [(L $_{\mathrm {b}}^{~2})_{2}$ Cu] were determined to confirm the molecular species unequivocally. The molecular structure of copper complexes exhibited tetragonally distorted (Jahn-Teller) geometry consistent with the d 9 configuration of Cu(II) metal ion. Oxidation of benzyl alcohols using the newly synthesized complexes as catalyst has been studied. Photoluminescence properties of [(L $_{\mathrm {a}}^{~2})_{2}$ Cu] and [(L $_{\mathrm {b}}^{~2})_{2}$ Cu] were exploited for selective cyanide recognition. The [(Lb)2Cu], complexes displayed antibacterial activity toward gram positive and gram negative bacteria.