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| Research Domain： |
Materials for Nonlinear Optical Applications |
| Keyword： |
Materials for Nonlinear Optical Applications |
| Research Production： |
Current trends suggest that light, rather than electricity, will increasingly be used in the area of information technology, with potential in optical communications, data storage and computer systems. Although materials being studied are diverse, they are usually "off-the-shelf" compounds selected by the physicists and engineers active in this area, so that there are many areas in which chemists can make important contributions by rational synthesis of designed candidate molecules for the optical technology industry.
Materials whose optical properties depend on the intensity of the incident light are termed non-linear optical (NLO) materials. Organic compounds that are asymmetrically polarizable e.g. through conjugated p systems, have been shown to produce large NLO responses. We are interested in both organic and organometallic materials. Organometallic complexes combine the advantage of organic materials (fast NLO responses) with the design flexibility of inorganic complexes (variation in oxidation state, coordination number, coordination geometry, and co-ligands, and intense MLCT transitions). Initial work has focussed on metal acetylide complexes. These are usually thermally robust and oxidatively stable, and accessible in high yields by well-established synthetic methodologies. We have systematically varied molecular components in order to derive structure-NLO property relationships to facilitate organometallic NLO materials design and produced complexes have the largest quadratic and cubic nonlinearities for organometallic complexes thus far.
These studies have utilized hyper-Rayleigh scattering and electric field-induced second harmonic generation (experimental molecular quadratic nonlinearities), semi-empirical ZINDO (computational molecular quadratic nonlinearities), Kurtz powder (bulk second-order susceptibilities), and degenerate four-wave mixing and Z-scan (molecular cubic nonlinearities) measurements.
Our ongoing studies are involved with extending these small molecule-based studies into the macromolecular realm to afford useful and processable materials. There has been an explosion of interest in dendrimers (hyperbranched oligomers) recently, with the current move to prepare functional dendritic materials. We are currently investigating the NLO properties of arylalkynyl metal-based dendrimers with a variety of core units, branching groups and spacers. For example, our Ru9 species pictured has been shown to have the largest cubic nonlinearity for an organometallic complex thus far.
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Promulgator Info |
| Full name: |
hichem |
| Country: |
CN |
| City: |
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| Company Name: |
hichem |
| Homepage: |
http://www.teloon.com |
| E-mail: |
reply |
| Phone: |
86-411-82819585 |
| Fax: |
86-411-82819612 |
| Company Address: |
Renming Road, Dalian city, Lianning pro,china |
| Zip/Postal Code: |
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| Introduction: |
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