Dicarbonylrhodium(I) complexes of functionalized pyridine ligands and their catalytic activities
IR@NEIST: CSIR-North East Institute of Science and Technology, Jorhat
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| Title |
Dicarbonylrhodium(I) complexes of functionalized pyridine ligands and their catalytic activities
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| Creator |
KUMARI , N
SHARMA , B J DUTTA , D K |
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| Subject |
Material Science
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| Description |
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.
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| Date |
2007
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://neist.csircentral.net/213/1/2481_JournalMolecularCatalysis_A_Chemical%2C266(1%2D2)%2Cp%2D260%2D266.pdf
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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| Relation |
http://neist.csircentral.net/213/
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