Please wait, while we are loading the content...
Please wait, while we are loading the content...
| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Camerel, Franck Barberá, Joaquín Ziessel, Raymond Retailleau, Pascal Olivier, Jean-hubert |
| Description | Author Affiliation: Olivier JH ( Laboratoire de Chimie Organique et Spectroscopies Avancées (LCOSA), Ecole Européenne de Chimie, Polymères et Matériaux, CNRS, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France.) |
| Abstract | Une nouvelle série de complexes mésogènes obtenus par association électrostatique entre l’anthracène-2,6-disulfonate et des imidazoliums fonctionnalisés a été synthétisée. Les propriétés optiques et d’auto-organisation de ces complexes, constitués d’un noyau rigide central dianionique d’anthracène et de deux cations flexibles à cœur imidazolium, ont été étudiées. Associé à des dérivés d’ammoniums portant de longues chaînes carbonées, l’anthracène-2,6-disulfonate peut être cristallisé et la structure obtenue avec la cation $^{+}N(CH_{3})_{2}(C_{16}H_{33})_{2}$ montre qu’il n’y a pas de ségrégation entre les chaînes grasses et le cœur rigide du dérivé d’anthracène. Par contre, associé à des imidazoliums fonctionnalisés par des dérivés tris-alkoxybenzyl, une microségrégation peut être engendrée et des mésophases colonnaires ont pu être observées et identifiées par POM ainsi que par diffraction aux rayons X. Des études par calorimétrie différentielle à balayage (DSC) confirme le comportement mésomorphe des complexes sur une large gamme de température s’étalant de 20°C à 200°C avec des chaînes alkyles à 8, 12, 16 atomes de carbone. Les propriétés de luminescence de l’anthracène sont maintenues au sein des mésophases et des études par spectroscopie d’émission confirment la présence d’agrégat de type J entre les fragments aromatiques. Ces nouveaux complexes fonctionnels, obtenus par auto-assemblage par voie électrostatique, fournissent un accès rapide et simple à des matériaux mésomorphes et luminescents. Abstract in Spanish: Hemos diseñado y sintetizado una serie de complejos mesógenos modulares basados en antraceno-2,6-disulfonato y cationes imidazolio funcionalizados con tris(alcoxi)bencilo. Todos los complejos contienen un núcleo central rígido dianiónico de antraceno y dos monocationes flexibles que portan cadenas parafínicas ancladas en los anillos de imidazol. El antraceno-2,6-disulfonato puede cristalizarse con varios iones alquilamonio simples y, en el caso de $^{+}N(CH_{3})_{2}(C_{16}H_{33})_{2},$ la determinación de la estructura cristalina ha mostrado que las cadenas parafínicas largas están intercaladas entre las unidades de antraceno. Con los cationes tris(alcoxi)bencilimidazolio, el dianión forma mesofases columnares identificadas por medidas de microscopía óptica con luz polarizada y difracción de rayos X. Los estudios de DSC confirman el comportamiento mesomorfo desde temperatura ambiente hasta 200ºC para cadenas alquílicas que contienen 8, 12 y 16 átomos de carbono. La fuerte luminiscencia del antraceno se mantiene en la mesofase y las medidas de fluorescencia confirman la presencia de agregados J en todos los casos. Los nuevos materiales funcionales descritos aquí representan un fácil acceso a materiales mesomorfos luminiscentes estables generados por un proceso de auto-ensamblaje iónico. |
| ISSN | 09476539 |
| e-ISSN | 15213765 |
| Journal | Chemistry - A European Journal |
| Issue Number | 33 |
| Volume Number | 15 |
| Language | English |
| Publisher | Wiley-VCH;ChemPubSoc Europe |
| Publisher Date | 2009-08-17 |
| Publisher Place | Germany |
| Access Restriction | Open |
| Subject Keyword | Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Catalysis |
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...
|