Vibrational and quantum-chemical study of nonlinear optical chromophores containing dithienothiophene as the electron relay

被引:45
作者
Casado, J
Hernández, V
Kim, OK
Lehn, JM
Navarrete, JTL
Ledesma, SD
Ortiz, RP
Delgado, MCR
Vida, Y
Perez-Inestrosa, E
机构
[1] Univ Malaga, Fac Ciencias, Dept Quim Fis, E-29071 Malaga, Spain
[2] Univ Malaga, Fac Ciencias, Dept Quim Organ, E-29071 Malaga, Spain
[3] USN, Res Lab, Div Chem, Washington, DC 20375 USA
[4] Coll France, F-75005 Paris, France
关键词
density functional calculations; IR spectroscopy; nonlinear optics; push-pull oligomers; Raman spectroscopy; vibrational spectroscopy;
D O I
10.1002/chem.200305752
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A series of nonlinear optical (NLO) donor-acceptor (D-A) chromophores containing a fused terthiophene, namely dithienothiophene (DTT), as the electron relay, the same donor group, and acceptors of various strengths, has been investigated by means of infrared and Raman spectroscopies, both in the solid state as well as in a variety of solvents, to evaluate the effectiveness of the intramolecular charge transfer from the electron-donor to the electron-acceptor end groups. The Raman spectral profiles of these NLO-phores measured from their dilute solutions have been found to be rather similar to those of the corresponding solids, and thus their intramolecular charge transfer (ICT) shows very little dependence on the solvent polarity. The experimental results obtained for the DTT-containing NLO-phore with a 4-(N,N-dibutylamino)styryl end group as the donor and a 2,2-dicyanoethen-1-yl end group as the acceptor differ from those previously obtained for two parent "push-pull" chromophores with the same D-A pair but built-up around either a bis(3,4-ethylenedioxythienyl) (BEDOT) or a bithienyl (BT) electron relay. Vibrational spectroscopy shows that DTT is significantly more efficient as an electron relay than BT (which has the same number of conjugated C=C bonds) or BEDOT (which can be viewed as a rigidified version of BT on account of noncovalent intramolecular interactions between heteroatoms of adjacent rings). Density functional theory (DFT) calculations have also been performed on these NLO-phores to assign their main electronic and vibrational features and to obtain information about their structures. An additional merit of these molecular materials was revealed by the infrared spectra of the DTT-based NLO-phores recorded at different temperatures. Thus, spectra recorded between -170 and 150degreesC did not show any substantial change, indicating that the materials have a high thermal stability, which is of significance for their use as active components in optoelectronic devices.
引用
收藏
页码:3805 / 3816
页数:12
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