Molybdenum Complexes Bearing (Bi)thienyl‐ or Arylthienyl‐Substituted π‐Conjugated Spacers: Synthesis, Electrochemical, Spectroscopic and Nonlinear Optical Properties

Abstract

AbstractA series of complexes trans‐[FMo(N=NCHL)(dppe)2][BF4] {L = (bi)thienyl or arylthienyl}, were synthesized and fully characterized by 1H, 13C, 31P NMR, IR and UV/Vis spectroscopy. The electronic spectra and electrochemical behavior of the complexes were investigated. The electronic absorption spectra of these complexes display a broad low‐energy band in the visible region attributable to metal‐to‐ligand charge‐transfer (MLCT) transitions. The electron‐conjugated effect with the heterocyclic nucleus led to a notable improvement of visible light absorption and marked changes in the electrochemical behavior. The hyperpolarizabilities β of the synthesized compounds were evaluated using the hyper‐Rayleigh scattering technique.