A new highly selective chemosensor for Cu 2 + and S 2 À ions, Ethyl 2-cyano-3-(2-hydroxy-5-methyl-3-(p-tolylimino)methyl) phenyl)acrylate) (HL) based on 2, 6-diformyl-4-methylphenol was designed and synthesized. The ligand exhibited excellent sensitivity towards copper ion by the emission quenching even in the presence of other biologically important metal ions. Once HL combine with Cu 2 + it can display a rapid response and high selectivity toward sulfide anion resulting in off-on sensing via Cu 2 + displacement assay. The signal transduction happen via reversible formation-separation of complex L-Cu and CuS and the complex LÀCu was synthesized by the reaction of HL and Cu 2 + and characterized by single-crystal Xray diffraction and DFT optimization studies. The catecholase like activity for LÀCu complex have been studied by using 3,5di-tertbutylcatechol (3,5-DTBC) as the substrate.[a] Dr.
The new complexes of compositions [(L a) 2 Cu] and [(L b) 2 Cu] were prepared by treating with 2-hydroxy-5-methyl-3-(2-aryldiazenyl)phenylimino) methyl) benzaldehyde (HL a) and ethyl-2-cyano-3-(2hydroxy-5-methyl-3-(-(2-aryldiazenyl) phenylimino) methyl) phenyl) acrylate (HL b) ligands [where aryl is phenyl for HL 1 a and HL 1 b ; p-methyl phenyl for HL 2 a and HL 2 b ; and p-chloro phenyl for HL 3 a and HL 3 b ] with Cu(OAc) 2 .H 2 O, respectively. Both the bis copper(II) complexes consist of tridentate (N,N,O) anionic ligands, L − a or L − b. X-ray structures of the representative complexes [(L 1 a) 2 Cu] and [(L 2 b) 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 2 a) 2 Cu] and [(L 2 b) 2 Cu] were exploited for selective cyanide recognition. The [(L b) 2 Cu], complexes displayed antibacterial activity toward gram positive and gram negative bacteria.
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