Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Electronic spectroscopy and photodissociation dynamics of hydrated Co2+ clusters: Co2+(H2O)(n) (n=4-7)
Autore:
Faherty, KP; Thompson, CJ; Aguirre, F; Michne, J; Metz, RB;
Indirizzi:
Univ Massachusetts, Dept Chem, Amherst, MA 01003 USA Univ Massachusetts Amherst MA USA 01003 Dept Chem, Amherst, MA 01003 USA
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY A
fascicolo: 44, volume: 105, anno: 2001,
pagine: 10054 - 10059
SICI:
1089-5639(20011108)105:44<10054:ESAPDO>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
FIRST TRANSITION SERIES; FLIGHT MASS-SPECTROMETER; LIGAND CHARGE-TRANSFER; METAL HEXAAQUA IONS; AB-INITIO; WATER-EXCHANGE; PHOTOFRAGMENT SPECTROSCOPY; ALKALINE-EARTH; DIVALENT; SPECTRA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Metz, RB Univ Massachusetts, Dept Chem, Amherst, MA 01003 USA Univ Massachusetts Amherst MA USA 01003 m, Amherst, MA 01003 USA
Citazione:
K.P. Faherty et al., "Electronic spectroscopy and photodissociation dynamics of hydrated Co2+ clusters: Co2+(H2O)(n) (n=4-7)", J PHYS CH A, 105(44), 2001, pp. 10054-10059

Abstract

Solvated cluster ions Co2+ (H2O)(n) with n = 4-7 have been generated by electrospray ionization and studied by laser photofragment spectroscopy. The similarity between the spectrum of gas-phase Co2+(H2O)(6) and the absorption spectrum of aqueous cobalt(II) suggests that Co2+(H2O)(6) ((aq)) is responsible for the room-temperature solution absorption spectrum. The observed photodissociation spectrum of Co2+(H2O)(4) is similar to new bands which appear in aqueous cobalt(II) at high temperatures and have been assigned to Co2+ (H2O)(4 (aq)) by Swaddle and Fabes (Swaddle, T. W.; Fabes, L. Can. J. Chem. 1980, 58, 1418-1426). The hexahydrate was found to dissociate by loss of one or two water molecules, whereas the heptahydrate dissociates by lossof two or three water molecules. In both cases, loss of two water molecules is the preferred dissociation pathway. The tetrahydrate dissociates either by simple loss of water or by charge separation to form CoOH+(H2O)(2) andH3O+, with charge separation being the preferred dissociation channel. At 570 nm, photodissociation by charge separation leads to a kinetic energy release of 110 +/- 20 kJ/mol, 48% of the available energy. This modest kinetic energy release is consistent with a "salt bridge" mechanism.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 16/07/20 alle ore 19:31:20