KUMARI , N and SHARMA , B J and DUTTA , D K (2007) Dicarbonylrhodium(I) complexes of functionalized pyridine ligands and their catalytic activities. Journal of Molecular Catalysis A: Chemical, 266 (1-2). pp. 260-266.

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Abstract

Reactions of dimeric complex [Rh(CO)2Cl]2 (1) with pyridine ester ligands methyl picolinate (a), methyl nicotinate (b), methyl isonicotinate (c),ethylpicolinate(d),ethylnicotinate(e)andethylisonicotinate(f)inthe1:2molarratioaffordthecomplexesofthetype[Rh(CO)2ClL](1a–f). Thecomplexes1a–fexhibittwoequallyintenseν(CO)bandsintherange1990–2091cm−1 indicatingcis-dispositionofthetwoterminalcarbonyl groups.Thecomplexes1aand1dundergopartialdecarbonylationreactioninsolutiontogivethecorrespondingchelatedmonocarbonylcomplexes [Rh(CO)Cl(methylpicolinate)](1a)and[Rh(CO)Cl(ethylpicolinate)](1d),respectively.Thecomplexes1a–fundergooxidativeadditionreaction withdifferenttypesofelectrophileslikeCH3I,C2H5I,C6H5CH2ClandI2 toyield[Rh(CO)(COCH3)ClIL](2a–f),[Rh(CO)(COC2H5)ClIL](3a–f), [Rh(CO)(COCH2C6H5)Cl2L] (4a–f) and [Rh(CO)ClI2L] (5a–f) complexes, respectively. The complexes have been characterized by elemental analysis,IRand 1HNMRspectroscopy.Thetimetakenbythedifferentcomplexes1a–fforthecompletionofoxidativeadditionreactionsofCH3I are different and the complex 1f took the shortest time while the complex 1b required the longest time. The catalytic activity of the complexes [Rh(CO)2ClL] (1) in carbonylation of methanol is higher (TON=844–1251) than the well known [Rh(CO)2I2]− species (TON=653). © 2006 Elsevier B.V. All rights reserved.

Item Type:	Article
Subjects:	Chemistry > Material Science
Divisions:	UNSPECIFIED
Depositing User:	Dr. PK Barooah
Date Deposited:	29 Dec 2011 07:22
Last Modified:	29 Dec 2011 07:22
URI:	http://neist.csircentral.net/id/eprint/213

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