title: A purely vibrational insight on the tetragonal distortion of [Cu(DMF)6](2+).
abstract: Raman spectra of N,N-dimethylformamide (DMF) solutions containing copper perchlorate at different compositions have been recorded. The spectral changes exhibited at the rmethyl region of DMF, in the presence of the Cu(II) salt, were reported for the first time. A correlation with the δOCN region is made. The quantitative Raman analysis performed at the rmethyl region allowed the determination of an average number of 6 DMF molecules per Cu(II) in the first solvation shell. This value as combined to the spectral variations observed in both regions of DMF allow us to propose the existence of axial bond lengths longer than equatorial ones in the octahedron. The spectra also reveal that the counter-ion is not capable of affecting the stability of the [Cu(DMF)6](2+) complex for the whole investigated concentration range.
authors.affiliation: Departamento de Química Inorgânica, Instituto de Química, Universidade Federal do Rio de Janeiro, Caixa Postal 68563, Rio de Janeiro, RJ 21941-909, Brazil.
authors.forename: Aaron I
authors.initials: AI
authors.lastname: Freire
authors.affiliation: Departamento de Química Inorgânica, Instituto de Química, Universidade Federal do Rio de Janeiro, Caixa Postal 68563, Rio de Janeiro, RJ 21941-909, Brazil. Electronic address: wagner@iq.ufrj.br.
authors.forename: Wagner A
authors.initials: WA
authors.lastname: Alves
mesh_terms: D003300:Copper / Q000737:chemistry*; D004126:Dimethylformamide / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D014732:Vibration
chemical_list: D003300:Copper; D004126:Dimethylformamide
keywords: Copper perchlorate; DMF; Raman spectra; Solution