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Titolo:
Lowest electronic excited states of platinum(II) diimine complexes
Autore:
Connick, WB; Miskowski, VM; Houlding, VH; Gray, HB;
Indirizzi:
CALTECH, Beckman Inst 13974, Pasadena, CA 91125 USA CALTECH Pasadena CA USA 91125 Beckman Inst 13974, Pasadena, CA 91125 USA
Titolo Testata:
INORGANIC CHEMISTRY
fascicolo: 12, volume: 39, anno: 2000,
pagine: 2585 - 2592
SICI:
0020-1669(20000612)39:12<2585:LEESOP>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
SQUARE-PLANAR PLATINUM(II); CIRCULAR-DICHROISM SPECTRA; PALLADIUM(II) COMPLEXES; ABSORPTION-SPECTRA; ENVIRONMENTAL SENSORS; INFRARED-SPECTROSCOPY; CHELATE LIGANDS; METAL; PHOTOPHYSICS; LUMINESCENCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
54
Recensione:
Indirizzi per estratti:
Indirizzo: Connick, WB Univ Cincinnati, Dept Chem, Cincinnati, OH 45221 USA Univ Cincinnati Cincinnati OH USA 45221 cinnati, OH 45221 USA
Citazione:
W.B. Connick et al., "Lowest electronic excited states of platinum(II) diimine complexes", INORG CHEM, 39(12), 2000, pp. 2585-2592

Abstract

Absorption and emission spectra of Pt(diimine)L-2 complexes (diimine = 2,2'-bipyridine (bpy) or 4,4'-dimethyl-2,2'-bipyridine (dmbpy); L = pyrazolate(pz(-)), 3,5-dimethylpyrazolate (dmpz(-)), or 3,4,5-trimethylpyrazolate (tmpz(-))) have been measured. Solvent-sensitive absorption bands (370-440 nm) are attributed to spin-allowed metal-to-ligand charge-transfer ((MLCT)-M-1) transitions. As solids and in 77 K glassy solution, Pt(bpy)(pz)2 and Pt(dmbpy)(pz)(2) exhibit highly structured emission systems (lambda(max) approximate to 494 nm) similar to those of the diprotonated forms of these complexes. The highly structured bands (spacings 1000-1400 cm(-1)) indicate thatthe transition originates in a diimine-centered (3)(pi-->pi*) ((LL)-L-3) excited state. The intense solid-state and 77 K glassy solution emissions from (MLCT)-M-3[d(Pt)-->pi*(bpy)] excited states of complexes with dmpz(-) and tmpz(-) ligands occur at longer wavelengths (lambda(max) = 500-610 nm), with much broader vibronic structure. These findings are consistent with increasing electron donation of the pyrazolate ligands, leading to a distinct crossover from a lowest (LL)-L-3 to a (MLCT)-M-3 excited state.

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Documento generato il 04/07/20 alle ore 18:09:09