Influence of ion pairing on the UV-spectral behavior of KI dissolved in supercritical NH3: From vapor phase to condensed liquid

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The UV-spectroscopic behavior of KI dissolved in supercritical ammonia enabled us to identify two species that contribute to the optical absorption depending on the fluid density ρ1 and the temperature T. At low ρ1 and high T, contact ion pairs (CIPs) prevail, while at high density of ammonia, solve...

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Autor principal: Sciaini, G.
Otros Autores: Marceca, E., Fernández-Prini, R.
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2005
Acceso en línea:Registro en Scopus
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100 1 |a Sciaini, G. 
245 1 0 |a Influence of ion pairing on the UV-spectral behavior of KI dissolved in supercritical NH3: From vapor phase to condensed liquid 
260 |c 2005 
270 1 0 |m Fernández-Prini, R.; INQUIMAE-DQIAQF, Facultad Cs. Exactas y Naturales, Pabellon II, Buenos Aires, Argentina; email: rfprini@cnea.gov.ar 
506 |2 openaire  |e Política editorial 
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520 3 |a The UV-spectroscopic behavior of KI dissolved in supercritical ammonia enabled us to identify two species that contribute to the optical absorption depending on the fluid density ρ1 and the temperature T. At low ρ1 and high T, contact ion pairs (CIPs) prevail, while at high density of ammonia, solvent separated ion pairs (SSIPs) and free iodide ions dominate the optical absorption of the solute. The features of the electron excitation process depend on the state of the K+I- species present. Starting with isolated KI in the vapor, where the process is an interionic charge transfer, when the CIP becomes solvated the UV absorption shifts strongly to the blue. As ρ1 increases, the amounts of SSIP and of free iodide increase progressively and their electronic excited states become those characteristic of the charge-transfer-to-solvent process. This study suggests there is a strong influence of the cation on the electronic transition of dissolved iodide when it is forming CIPs. Moreover, the fact that K+-NH3 interaction is much larger than that of I --NH3 suggests that the electronic photoinduced excited state of CIPs is similar to the ground state observed for alkali metals in NH3 clusters. © 2005 American Chemical Society.  |l eng 
593 |a INQUIMAE-DQIAQF, Facultad Cs. Exactas y Naturales, Pabellon II, Buenos Aires, Argentina 
593 |a Unidad Actividad Química, Comisión Nacional Energía Atómica, Av. Libertador 8250, Buenos Aries, Argentina 
690 1 0 |a CHARGE TRANSFER 
690 1 0 |a DENSITY (SPECIFIC GRAVITY) 
690 1 0 |a DISSOLUTION 
690 1 0 |a GROUND STATE 
690 1 0 |a LIGHT ABSORPTION 
690 1 0 |a POSITIVE IONS 
690 1 0 |a ULTRAVIOLET RADIATION 
690 1 0 |a EXCITED STATES 
690 1 0 |a FLUID DENSITY 
690 1 0 |a ION PAIRING 
690 1 0 |a SUPERCRITICAL AMMONIA 
690 1 0 |a SUPERCRITICAL FLUIDS 
700 1 |a Marceca, E. 
700 1 |a Fernández-Prini, R. 
773 0 |d 2005  |g v. 109  |h pp. 18949-18955  |k n. 40  |p J Phys Chem B  |x 15206106  |w (AR-BaUEN)CENRE-5879  |t Journal of Physical Chemistry B 
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856 4 0 |u https://doi.org/10.1021/jp053446g  |y DOI 
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