Please wait, while we are loading the content...
Please wait, while we are loading the content...
| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Glidle, Andrew Lindall, Charles M. Peacock, Robert D. Cole-Hamilton, David J. Crayston, Joe A. |
| Copyright Year | 1996 |
| Abstract | Mixed-metal polymers [Os(bipy)2(PVPS)nClRu(edta)](n= 10,15,20) have been prepared by reaction of [Os(bipy)2(PVPS)nCl]Cl coated electrodes with K[Ru(edta)(H2O)](n= 10,15,20) in solutions of various electrolytes (PVPS = polyvinylpyridine–co-styrene, 10% styrene; edta = ethylenediaminetetraacetato; bipy = 2,2′-bipyridyl). Incorporation of the [Ru(edta)]– unit and binding to the pyridine ligands of P VPS takes place with displacement of water from the coordination sphere of the Ru centre. The resulting [Os(bipy)2(PVPS)nClRu(edta)](n= 10,15,20) polymers are reasonably stable, although reduction at –0.4 V causes gradual loss of Ru centres over 1 h. Slow-scan voltammetry (5 mV s–1) of thin films in aqueous and acetonitrile solvents confirms the approximate 1:1 Os: Ru stoichiometry. Charge-transport characteristics have been investigated by chronocoulometry and rotating disk voltammetry. The behaviour of [Os(bipy)2(PVPS)nCl]X towards other anionic complexes has been investigated: [Mo(CN)8]4– and [Fe(bathophen)3]4–(bathophen = 4,7-diphenyl-l,10-phenanthrolinedisulfonate) bind electrostatically to [Os(bipy)2(PVPS)nCl]X. Ion-exchange studies of the mixed Os-Ru polymers towards complex anions and cations shows that methyl viologen (MV2+) induces a decrease in the electroactivity of the covalently bound [Ru(edta)]– units, and additionally, a decrease in the electroactivity of the Os sites. The fraction of electroactive Os sites in the thick films is increased by the presence of coordinated Ru owing to an enhanced rate of charge transport. No evidence was found that reduction of the [Ru(edta)]– units of the mixed Os-Ru polymer induces incorporation of MV2+; instead, loss of [Ru(edta)(H2O)]– from the polymer rather than MV2+ incorporation dominates. Oxidation of the [Os(bipy)2Cl]+ units of the mixed Os-Ru polymer does, however, induce incorporation of [Fe(bathophen)3]4–; alternatively, quaternization of the polymer dramatically increases its affinity for anions. It is possible to incorporate MV2+ and [Fe(bathophen)3]4– simultaneously, yielding a multiple redox polymer containing six different redox states. In aqueous 0.1 mol dm–3 NaNO3 solution in the absence of added Ru complex, quartz crystal microbalance experiments show rapid loss of the Ru complex from the polymer, leaving an Os polymer which takes up anions on oxidation. In acetonitrile solvent the stability of the attached Ru is much greater and quartz crystal microbalance experiments suggest that the mixed Os–Ru polymer shows a mass increase on Ru reduction, associated with both cation ingress and anion egress. The RuIII/II potential in acetonitrile becomes more negative, indicating stronger preferences of the polymer and cations for the oxidized Ru IIhalf of the redox couple. |
| Starting Page | 1259 |
| Ending Page | 1269 |
| Page Count | 11 |
| File Format | |
| ISSN | 09599428 |
| Volume Number | 6 |
| Issue Number | 8 |
| Journal | Journal of Materials Chemistry |
| DOI | 10.1039/JM9960601259 |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Ethylenediaminetetraacetic acid Styrene Pyridine Virtual private server Voltammetry Acetonitrile Stoichiometry Paraquat Polymer Menshutkin reaction Redox Sodium nitrate Microbalance Solvent Ion |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Materials Chemistry |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
| 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 |
|
Loading...
|