Seven-coordinate rhenium(III) complexes of 1-(2-pyridylazo)-2-naphtholate: X-ray studies, spectroscopic characterization and DFT calculations
摘要:
The reactions of [ReX3(MeCN)(PPh3)(2)] (X = Cl or Br) with 1-(2-pyridylazo)-2- naphthol (HPAN) have been examined and the [ReBr(PAN)(2)] center dot 2CHCl(3) (1) and [ReCl(PAN)(2)] (2) complexes have been obtained. The both complexes have been structurally and spectroscopically characterized, and compound I has been additionally studied by magnetic measurements. The magnetic behavior is characteristic of mononuclear seven-coordinated Re(III) complex with d(4) IOW-spin configuration, which gives diamagnetic ground state. The electronic structure of [ReBr(PAN)21 has been calculated with the density functional theory (DFT) method. The time-dependent DFT calculations have been employed to calculate the electronic spectrum of [ReBr(PAN)(2)], and the UV-Vis spectra of the [ReX(PAN)(2)] compounds have been discussed on this basis. (c) 2008 Elsevier Ltd. All rights reserved.