titoli, abstracts, parole chiave >>>
Synthesis and characterization of gold(III) adducts and cyclometallated derivatives with 2-substituted pyridines: crystal structure of [Au{NC5H4(CMe2C6H4)-2}Cl2]

Cinellu, Maria Agostina and Zucca, Antonio and Stoccoro, Sergio and Minghetti, Giovanni and Manassero, Mario and Sansoni, Mirella (1995) Synthesis and characterization of gold(III) adducts and cyclometallated derivatives with 2-substituted pyridines: crystal structure of [Au{NC5H4(CMe2C6H4)-2}Cl2]. Journal of the Chemical Society. Dalton Transactions, Vol. 1995 (17), p. 2865-2872. ISSN 0300-9246. Article.

Full text not available from this repository.

DOI: 10.1039/DT9950002865

Abstract

The 2-benzylpyridines HL [NC5H4-(CH2Ph)-2, -(CHMePh)-2 and (CMe2Ph)-2] reacted with AuCl3·2H2O or Na[AuCl4] to give adducts [Au(HL)Cl3] or cyclometallated derivatives [AuLCl2]. The metallation reaction involves direct activation of a C–H bond of the phenyl substituent. With the 2-alkylpyridines NC5H4(CMe3)-2 and NC5H4(CH2CMe3)-2 (HL) only the tetrachloroaurate(III) salts [H2L][AuCl4] were isolated. The structure of [Au{NC5H4(CMe2C6H4)-2}Cl2] has been determined by X-ray diffraction. It reveals a six-membered ring having a boat-like conformation: there is a rather short interaction between one hydrogen of the Me group in axial position and the gold atom, Au H 2.56(5)Å. The cyclometallated species react with PPh3 to give cationic complexes [AuL(PPh3)Cl]+ and with 1,2-bis(diphenylphosphino)ethane (dppe) to yield [AuL(dppe)Cl]+. Under pressure (50 atm, 60 °C) of CO extrusion of the metal occurs. The organic products formed likely arise from insertion of CO into the Au–C bond. The reactivity of the cycloaurated species is compared with that of analogous palladium(II) derivatives described previously.

Item Type:Article
ID Code:5387
Status:Published
Refereed:Yes
Uncontrolled Keywords:Gold(III) adducts, cyclometallated derivatives, 2-substituted pyridines
Subjects:Area 03 - Scienze chimiche > CHIM/03 Chimica generale e inorganica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:Royal Society of Chemistry
ISSN:0300-9246
Deposited On:27 Jan 2011 12:43

I documenti depositati in UnissResearch sono protetti dalle leggi che regolano il diritto d'autore

Repository Staff Only: item control page