title: Synthesis and spectroscopic studies of homo-binuclear, alkoxo bridged homo- and hetero-tetranuclear metal complexes of a bis-N2O4 Schiff base ligand derived from ethanolamine and macroacyclic tetranaphthaldehyde.
abstract: Three new homo-binuclear Ni(II), Cu(II), Zn(II) complexes (2-4), homo-tetranuclear Cu(II) complex (5), and hetero-tetranuclear Cu(II)-Ni(II) complex (6) of a macroacyclic potentially bis-hexadentate N2O4 Schiff base have been synthesized. The imino-alcohol ligand, H4L was obtained by the condensation of ethanolamine with 2,2'-[2,3-bis(1-formyl-2-naphthyloxymethyl)-but-2-ene-1,4-diyldioxy]bis(naphthalene-1-carbaldehyde). The structures of both the Schiff base and its complexes have been proposed by elemental analyses, spectroscopic data i.e. IR, 1H and 13C NMR, UV-vis, electrospray ionisation mass spectra, molar conductivities and magnetic susceptibility measurements. The ligand has two similar compartments to bind first primary two metal ions, and acts bi- or tetra-negative, bis-tetradentate forming five membered chelate ring. However, secondary two metal ions (either Cu2+ or Ni2+) are ligated with dianionic oxygen atoms of the alcohol groups and are linked to the 1,10-phenanthroline-nitrogen atoms in the tetranuclear complexes (5 and 6).
authors.affiliation: Department of Chemistry, Rize University, TR-53100 Rize, Turkey.
authors.forename: Kaan
authors.initials: K
authors.lastname: Karaoğlu
authors.forename: Talat
authors.initials: T
authors.lastname: Baran
authors.forename: Ismail
authors.initials: I
authors.lastname: Değirmencioğlu
authors.forename: Kerim
authors.initials: K
authors.lastname: Serbest
mesh_terms: D019856:Ethanolamine / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008280:Magnetics; D008956:Models, Chemical; D015394:Molecular Structure; D009281:Naphthalenes / Q000737:chemistry*; D009589:Nitrogen Oxides / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D012545:Schiff Bases; D021241:Spectrometry, Mass, Electrospray Ionization; D013055:Spectrophotometry, Infrared
chemical_list: D009281:Naphthalenes; D009589:Nitrogen Oxides; D009942:Organometallic Compounds; D012545:Schiff Bases; D019856:Ethanolamine; C015167:nitrogen tetroxide