title: Ni(II) and Zn(II) Complexes Containing Alkynyl Functionalized Salicylaldimine Ligand and Heterocyclic Coligand: Synthesis, Characterization and Luminescence Properties.
abstract: Some nickel(II) and zinc(II) complexes of the type [Ni(L)(phen/bipy)]X (1a-6a) and [Zn(L) (phen/bipy)]X (1b-6b) (where L = 2-{(E)-[(4-trimethylsilylethynylphenyl)imino]methyl}-4-(4-nitro phenylethynyl)phenol; phen = 1, 10-phenanthroline, bipy = 2, 2´-bipyridine; X = ClO4-, BF4-, PF6-) have been prepared and characterized on the basis of elemental analyses, FTIR,1H NMR and mass spectral studies. The molecular structure of L was determined by single crystal X-ray diffraction studies. The electrochemical behaviour of the Ni(II) complexes indicate that the phen complexes appears at more positive potential as compared to those for bipy complexes, as a consequence of its strong π-acidic character. TGA was carried out to study the thermal behavior of the complexes. Room temperature luminescence is observed for all complexes corresponds to π → π* ILCT transition. The size of the counter anion and heterocyclic coligands phen and bipy shows marked effect on emission properties of the complexes.
authors.affiliation: Department of Chemistry, Shivaji University, Kolhapur, MS, 416 004, India.
authors.forename: M S
authors.initials: MS
authors.lastname: More
authors.affiliation: Department of Chemistry, Shivaji University, Kolhapur, MS, 416 004, India.
authors.forename: S S
authors.initials: SS
authors.lastname: Devkule
authors.affiliation: Department of Chemistry, Shivaji University, Kolhapur, MS, 416 004, India. sanjaycha2@rediffmail.com.
authors.forename: S S
authors.initials: SS
authors.lastname: Chavan
keywords: Ni(II)/Zn(II) complexes; Photoluminescence; Schiff base