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Attachment of Cobalt “Picket Fence” Porphyrin to the Surface of Gold Electrodes Coated with 1-(10-Mercaptodecyl)imidazole

Zou, Shouzhong and Clegg, Robert S. and Anson, Fred C. (2002) Attachment of Cobalt “Picket Fence” Porphyrin to the Surface of Gold Electrodes Coated with 1-(10-Mercaptodecyl)imidazole. Langmuir, 18 (8). pp. 3241-3246. ISSN 0743-7463. doi:10.1021/la011444r. https://resolver.caltech.edu/CaltechAUTHORS:20170427-103551816

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Abstract

Self-assembled monolayers of 1-(10-mercaptodecyl)imidazole on Au electrodes were used to bind cobalt “picket fence” porphyrin (cobalt 5,10,15,20-tetrakis(α,α,α,α-2-pivalamidophenyl)porphyrin) to the electrode surface. The binding involved coordination of the cobalt center of the porphyrin to the pendant imidazole groups in the monolayer coating. Attempts to coordinate the Co(II) oxidation state of the porphyrin to the coatings were not successful. However, with the Co(III) oxidation state, substantial binding was achieved which persisted even when the Co(III) was reduced to Co(II). Absorption spectra of the attached porphyrin were obtained for both oxidation states of the cobalt center. The remaining axial coordination site on the attached cobalt porphyrin is accessible to ligands, for example, imidazole, in aqueous solution.


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http://dx.doi.org/10.1021/la011444rDOIArticle
http://pubs.acs.org/doi/abs/10.1021/la011444rPublisherArticle
http://pubs.acs.org/doi/suppl/10.1021/la011444rPublisherSupporting Information
Additional Information:© 2002 American Chemical Society. Received 17 September 2001. Published online 22 March 2002. Published in print 1 April 2002. This work was supported by the National Science Foundation via Grant CHE-9816329 and by the Laboratory for Molecular Science, an NSF-supported facility at Caltech. Helpful discussions with Dr. Beat Steiger, Professor Ahmed Zewail, and Professor Jim Hutchinson are acknowledged with pleasure as is the assistance of Dr. Robert Rossi and Joseph Nemanick in the preparation of gold film electrodes.
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Funding AgencyGrant Number
NSFCHE-9816329
Issue or Number:8
DOI:10.1021/la011444r
Record Number:CaltechAUTHORS:20170427-103551816
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170427-103551816
Official Citation:Attachment of Cobalt “Picket Fence” Porphyrin to the Surface of Gold Electrodes Coated with 1-(10-Mercaptodecyl)imidazole Shouzhong Zou, Robert S. Clegg, and Fred C. Anson Langmuir 2002 18 (8), 3241-3246 DOI: 10.1021/la011444r
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76998
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:27 Apr 2017 22:19
Last Modified:15 Nov 2021 17:04

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