Proaromatic pyranylidene chalcogen analogues and cyclopenta[ c ]thiophen-4,6-dione as electron donors and acceptor in efficient charge-transfer chromophores
Fifteen new push-pull chromophores based on a proaromatic pyranylidene donor and its chalcogen analogues and various electron acceptor moieties were synthesized in a straightforward manner. These model molecules were designed and prepared to investigate the concept of proaromaticity as a tool to tune the fundamental properties of push-pull systems. All target chromophores with systematically varied
Photoisomerization of sterically hindered merocyanine dyes
作者:Andrew C. Benniston、Anthony Harriman、e McAvoy
DOI:10.1039/a703253f
日期:——
A small series of merocyanine dyes has been synthesized in which substituents are incorporated into the polymethine backbone. The substituent perturbs the local structure in the polyenic bridge, as evidenced by changes to the bond order, the valence electronic charge on certain bridging carbon atoms, the bond length alternation, and the torsion angle. There are corresponding variations in the rates of internal conversion and reverse isomerization that permit identification of the double bond around which rotation occurs. A good correlation exists between the rates of rotation and the torsion angle that permits a quantitative description of the overall photophysical properties of these compounds in propan-1-ol at room temperature.
Small push-pull molecules based on N,N-dibutylthiobarbituric electron-withdrawing unit and a combined electron donor have been designed and synthesized. Thiophene, N-methylpyrrole, and furan auxiliary donors were employed as central π-linkers accompanied by methoxy and amino mesomeric donors. Thorough structure-property relationships were investigated using both experimental and theoretical methods.
Non-linear optically active molecules, their synthesis, and use
申请人:McGinniss D. Vincent
公开号:US20080004415A1
公开(公告)日:2008-01-03
In one aspect, the present invention provides a hyperpolarizable organic chromophore. The chromophore is a nonlinear optically active compound that includes a π-donor conjugated to a π-acceptor through a π-electron conjugated bridge. In other aspects of the invention, donor structures and acceptor structures are provided. In another aspect of the invention, a chromophore-containing polymer is provided. In one embodiment, the chromophore is physically incorporated into the polymer to provide a composite. In another embodiment, the chromophore is covalently bonded to the polymer, either as a side chain polymer or through crosslinking into the polymer. In other aspects, the present invention also provides a method for making the chromophore, a method for making the chromophore-containing polymer, and methods for using the chromophore and chromophore-containing polymer.
Photophysical properties of merocyanine 540 derivatives
作者:Andrew C. Benniston、Anthony Harriman、Kirpal S. Gulliya
DOI:10.1039/ft9949000953
日期:——
Photophysicalproperties have been measured for five merocyanine dyes having (i) different alkyl substituents on the thiobarbiturate subunit [i.e. ethyl (butyl Merocyanine540), or hexyl], (ii) the sulfonate group replaced with a methyl group, or (iii) the benzoxazole residue replaced with 1,2-naphthoxazole, and for one of the corresponding oxonol derivatives. Neither the nature of the alkyl group