NDLI: Electrochemical characterization of ordered arrays of metallo- porphyrins in aqueous solution

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Tabbì, Giovanni Di Mauro, Giovanna Bonomo, Raffaele P. Purrello, Roberto
Description	Author Affiliation: Tabbì G ( Istituto di Biostrutture e Bioimmagini, CNR, U.O.S. di Catania, V.le A. Doria 6, 95125, Catania, Italy. gtabbi@unict.it)
Abstract	Metallated meso-tetrakis(N-methyl-4-pyridyl)porphyrin (MTMPyP) and 5,11,17,23-tetrasulfonato-25,26,27,28-tetrakis-(hydroxylcarbonylmethoxy)-calix[4]arene $(C_{4}TsTc)$ were used as key components for building up discrete supramolecular entities starting from the formation of the template species $MTMPyP:C_{4}TsTc$ (1:4, M = Cu, Zn). The stepwise addition of further amount of porphyrin allows the facile non-covalent synthesis of discrete supramolecular entities (2:4 and 3:4) which can be built up just by programming the right stoichiometric addition of the proper porphyrin . The redox potentials of these supramolecular complexes in aqueous media, as well as those of the parent metalloporphyrins , have been characterized by using square wave voltammetry technique. The use of the simulation procedure leads us to establish the electrochemical steps involved in the redox processes for each supramolecular species, evidencing multistep electron reductions which were not experimentally resolved clearly because of their closeness. The most striking result is that the electrochemistry of each of these supramolecular complexes is different from that of the parent components. This “anomalous” behavior can be explained only considering each of these supramolecular complexes as a unique entity, in which such an internal electronic communication might occur. The formation of the 1:4 supramolecular complex produces a negative shift as to the metallated porphyrin redox potentials of about 30 mV. In the case of 2:4 and 3:4 species, the redox potentials progressively shifts towards more positive values by about 10–15 mV for each complexation step.
ISSN	14779226
Issue Number	16
Volume Number	40
e-ISSN	13645447
Journal	Dalton Trans.
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2011-04-28
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Metalloporphyrins Chemistry Water Copper Electrochemistry Oxidation-Reduction Solutions Zinc Journal Article Research Support, Non-U.S. Gov't
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in