title: Conformational change of a chiral Schiff base Ni(II) complex with a binaphthyl moiety: application of vibrational circular dichroism spectroscopy.
abstract: Vibrational circular dichroism (VCD) spectroscopy was applied to study the structural change of a Ni(II) complex (denoted by [Ni(II)L]) with a chiral Schiff base ligand, (R)- or (S)-2,2'-bis(salicylideneamino)-1,1'-binaphthyl (denoted by H2L), in solution. The major signals in the mid-IR region were assigned on the basis of comparison with the DFT-calculated spectra. The complex transformed reversibly between the square-planar, tetrahedral and octahedral configurations, depending on solvents and temperature. The observed changes in the VCD peaks accompanying the transformation were analyzed in terms of the conformational change of the chiral ligand with a focus on the twisting angle in the Schiff base backbone and the dihedral angle of the binaphthyl group.
authors.affiliation: Department of Chemistry, Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan. sato.hisako.my@ehime-u.ac.jp
authors.forename: Hisako
authors.initials: H
authors.lastname: Sato
authors.forename: Yukie
authors.initials: Y
authors.lastname: Mori
authors.forename: Akihiko
authors.initials: A
authors.lastname: Yamagishi
mesh_terms: D002942:Circular Dichroism; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D009281:Naphthalenes / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D011789:Quantum Theory; D012545:Schiff Bases / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013696:Temperature
chemical_list: D056831:Coordination Complexes; D009281:Naphthalenes; D012545:Schiff Bases; D012997:Solvents; D009532:Nickel; C412330:1,1'-binaphthyl