ChemInform Abstract: MECHANISM OF THE QUENCHING OF THE EMISSION OF SUBSTITUTED POLYPYRIDINERUTHENIUM(II) COMPLEXES BY IRON(III), CHROMIUM(III), AND EUROPIUM(III) IONS

Lin, Chin-Tung; Boettcher, Wolfhardt; Chou, Mei H.; Creutz, Carol; Sutin, Norman

doi:10.1002/chin.197652349

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(3 citation statements)

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“…The values are Ksv = 2x1@ mol-l dm.' and k, = 2.86~10' mol-I dm3 s-' in agreement with those obtained in previous works (Lin et al, 1976). Table 2 gives the standard redox potentials of the couples Ru(bpy)j+'2+ and Fe7+'*+ in the different sodium nitrate solutions and the potentials for the reduction of the Ru(II1) complex to the emitting state of Ru(I1).…”

Section: Resultssupporting

confidence: 87%

“…The changes of k, with salt concentration are not large (see Table 1). k, is close to the diffusioncontrolled limit in all the media studied and in this case, the measured quenching rate constant is given by (Lin et al, 1976) where k,,, is the true activation-controlled rate constant and kdiff is the diffusion-limited rate constant.…”

Section: Discussionmentioning

confidence: 57%

“…The reaction studied can be considered adiabatic (Lin et al, 1976), therefore, xcl = 1. From the AG'…”

Section: (7)mentioning

confidence: 99%

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KINETIC SALT EFFECTS IN THE PHOTOCHEMICAL REACTION BETWEEN* Ru(bpy)2/3+ Fe3+

Rodrı́guez¹,

Rosa²,

Galán³

et al. 1992

Photochem & Photobiology

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Abstract— The photochemical reaction between the excited state of the complex Tris‐(2,2'‐bipyridine)ruthenium(II), *Ru(bpy)2/3+ iron(III) has been studied in different concentrated electrolyte solutions. A positive salt effect is found, which is specific in that its magnitude depends upon the nature of the salt. Since the rate constants are close to the diffusion limit the possibility has been considered that the process was controlled by either activation or diffusion. The influence of the electrolyte on kact, the true activation rate constant and on kdiff, the diffusion‐controlled rate constant, has been investigated. Results indicate that in concentrated electrolyte solutions the photochemical reaction studied is mainly diffusion controlled.

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Section: Resultssupporting

confidence: 87%

Section: Discussionmentioning

confidence: 57%