| Popis: |
A number of five-coordinate mono(2,2′,2″-terpyridine) complexes of formula M(terpy)X 2 [M = Co(II) or Ni(II); X = Cl − , Br − , I − , NCS − and NO 3 − have been prepared. Their reflectance spectra in the visible and near infrared regions have been obtained. These spectra exhibit as many as six absorption bands which may be attributed to d-d transitions. The magnetic behavior of these complexes has been studied over the range 15–400°K. Some of the magnetic moments are unusually high for such an asymmetric environment and remain high even at the lowest temperatures. An ordering of the d-orbitals based on the σ- and π-bonding abilities of the ligands is proposed to rationalize the observed spectral and magnetic results. |
