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Lopez MA, De La Rosa MA. Electronic effects on carbon monoxide dissociation from iron(II) tetraphenylporhyrins. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424605000939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
We report the kinetics of CO binding to a series of substituted ferrous tetra(4-X-phenyl)porphyrins ( X = CF 3, Cl , H , CH 3, OCH 3) in DMSO solvent using a mixture of 1,2-DMI/1-MeIm as proximal base. The CO dissociation rate constant increases with electron donation of the substituent X; the aggregate Hammett ρ value is -0.38. Using a Swain-Lupton analysis we determine the electronic effects to be transmitted 67% by through-bond or field effect and 33% by resonance. These results indicate that there is significant conjugation between the phenyl rings and the porphyrin core of iron tetraphenylporphyrin systems.
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Affiliation(s)
- Marco A. Lopez
- Department of Chemistry & Biochemistry, California State University at Long Beach, Long Beach, California, 90840, USA
| | - Martha A. De La Rosa
- Department of Chemistry & Biochemistry, California State University at Long Beach, Long Beach, California, 90840, USA
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Saffari J, Khorasani-Motlagh M, Noroozifar M. Axial ligation of iron(III) porphyrin with a series of aliphatic bases: Piperazine, Piperidine and Pyrrolidine. RUSS J INORG CHEM+ 2012. [DOI: 10.1134/s0036023612010184] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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