Geminate recombination in the ligand field photochemistry of pentacyanoferrate(II) complexes with 1,2-diaminoethane and 1,3-diaminopropane

Wavelength dependence and solvent effects on the ligand field photochemistry: the ring closure process in the excited [Fe(CN)5(tn)]3− complex

“…The observed pattern for the 313, 334,404, and 434 nm irradiations aligns with that previously reported for the 365 nm excitation (23). Figure 1 shows the role of solvent viscosity, whose decrease clearly favors a diffusional escape of the cyanide ion from the solvent cage.…”

“…The cyanide photolabilization was found to be strongly wavelength dependent. For the 365 nm irradiations, it was also observed that quantum yields of the process decreased with increasing glycerol concentration in the aqueous solution of the complex (23). The previously reported results allowed us to postulate a solvent cage mechanism for the reactive deactivation of the excited states of these complexes.…”

“…Monochromatic irradiations were obtained by using Oriel interference filters to isolate the 3 13,334, 365,404, or 434 nm Hg line. The photolysis system is described in detail elsewhere (22,23 (25) carried out before and after each photolysis run. All absorption spectra were recorded on a Beckman DU 70 spectrophotometer at 25.0°C.…”

“…The investigated photoreactions include the labilization of either L (18)(19)(20) or a cyanide ligand (19,(21)(22)(23). The cyanide photolabilization was found to be strongly wavelength dependent.…”

Propriedades fotoquímicas de alguns complexos de ferro(II) e rênio(I)

“…Essas mudanças podem ser convenientemente utilizadas I:lara gerar l"noviMentos direcionados e reversíveis em escala molecular. [39,[85][86][87]. Isso tornou possível quantificar a fotossubstituição do cianeto com rendimentos quânticos comparáveis aos da fotossubstituição do CO, das fosfinas, arsinas P(OCH3h e derivados [39,[88][89][90].…”