期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 13, 期 25, 页码 12087-12094出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1cp20945k
关键词
-
资金
- MIUR [RBNE033KMA, 2007LN873M]
- University of Padova
- CNR-INSTM
The two-photon absorption (TPA) properties of two extended symmetric squaraine dyes are thoroughly characterized from the experimental and quantum-chemical point of view. The two molecules are specially engineered to have a multipolar structure with increasing complexity, D-pi-A-pi-D and A'-pi-D-pi-A-pi-D-pi-A', respectively. The experimental TPA spectra, measured by means of the Z-scan technique in the femtoseconds regime, display considerably high values of TPA cross sections (sigma(TPA)) for both molecules. In particular, the squaraine with the more extended structure shows the highest value of sigma(TPA) ever reported for this class of molecules. CIS and TDDFT calculations of the one and two-photon absorption properties are carried out to clarify the origin of the observed TPA properties and fully characterize the electronic properties of these compounds. The calculations, in good agreement with the experimental data, suggest that the origin of this exceptionally high sigma(TPA) can be ascribed to the presence of a peripheral A' group, that increases the density of excited states involved in the TPA process.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据