Photochemical reaction of Cp*Ir(CO)2 with C6F5X (X = CN, F) : formation of diiridium(II) complexes

Photochemical reaction of Cp*Ir(CO)2 with C6F5X (X = CN, F) : formation of diiridium(II) complexes

Visible light irradiation of Cp*Ir(CO)2 (1) in pentafluorobenzontrile resulted in the formation of the two isomeric diiridium(II) complexes [Cp*Ir(μ-CO)(C6F4CN)]2 (3) and [Cp*Ir(CO)(C6F4CN)]2 (4), while the analogous reaction of 1 in hexafluorobenzene to give [Cp*Ir(μ-CO)(C6F5)]2 (3a) required UV...

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Bibliographic Details
Main Authors: Ganguly, Rakesh, Mak, Kar Hang Garvin, Chan, Pek Ke, Fan, Wai Yip, Leong, Weng Kee
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2014
Subjects:
DRNTU::Science::Chemistry::Organic chemistry::Organometallic compounds
Online Access:https://hdl.handle.net/10356/101390
http://hdl.handle.net/10220/18616
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Institution: Nanyang Technological University
Language: English
Description
Summary:Visible light irradiation of Cp*Ir(CO)2 (1) in pentafluorobenzontrile resulted in the formation of the two isomeric diiridium(II) complexes [Cp*Ir(μ-CO)(C6F4CN)]2 (3) and [Cp*Ir(CO)(C6F4CN)]2 (4), while the analogous reaction of 1 in hexafluorobenzene to give [Cp*Ir(μ-CO)(C6F5)]2 (3a) required UV irradiation. Complex 4 isomerizes to 3 under visible light irradiation. A reaction pathway to 4 involving aromatic nucleophilic substitution has been proposed on the basis of experimental and computational data. The isomerization of 4 to 3 is believed to proceed via a radical species resulting from homolytic fission of the Ir−Ir bond.

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