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Titolo:
CAN STERIC HINDRANCE CAUSE A GRADUAL CHANGE IN THE RING-CLOSURE MECHANISM OF COMPLEXES OF THE TYPE W(CO)5N-N, WHERE N-N REPRESENTS A SERIESOF SUBSTITUTED BIPYRIDINE LIGANDS
Autore:
CAO S; REDDY KB; EYRING EM; VANELDIK R;
Indirizzi:
UNIV UTAH,DEPT CHEM SALT LAKE CITY UT 84112 UNIV UTAH,DEPT CHEM SALT LAKE CITY UT 84112
Titolo Testata:
Organometallics
fascicolo: 1, volume: 13, anno: 1994,
pagine: 91 - 93
SICI:
0276-7333(1994)13:1<91:CSHCAG>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
METAL HEXACARBONYL SOLUTIONS; LASER FLASH-PHOTOLYSIS; HIGH-PRESSURE; REACTION-KINETICS; SPECTRAL CHARACTERIZATION; SOLVENT DISPLACEMENT; DIIMINE LIGANDS; MIXED-SOLVENTS; OPTICAL-CELL; INTERMEDIATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
S. Cao et al., "CAN STERIC HINDRANCE CAUSE A GRADUAL CHANGE IN THE RING-CLOSURE MECHANISM OF COMPLEXES OF THE TYPE W(CO)5N-N, WHERE N-N REPRESENTS A SERIESOF SUBSTITUTED BIPYRIDINE LIGANDS", Organometallics, 13(1), 1994, pp. 91-93

Abstract

The kinetics of the thermal ring-closure reactions of W(CO)5L, produced during the photolysis of W(CO)6/L, where L = 2,2'-bipyridine, 4,4'-dimethyl-2,2'-bipyridine, 4,4'-diphenyl-2,2'-bipyridine and 4,4'-di-tert-butyl-2,2'-bipyridine, were studied as a function of pressure. The values of the activation parameter DELTAV(double dagger) are small andnegative for these ligands, supporting an associative interchange mechanism (I(a)) for CO extrusion. The DELTAV(double dagger) values exhibit a specific trend toward more positive values on increasing the steric hindrance on the ligand. This trend is interpreted as evidence for a gradual change in mechanism from a more associative to a more dissociative ring-closure process.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 21:23:06