Cooperative enhancement versus additivity of two-photon-absorption cross sections in linear and branched squaraine superchromophores

被引：48

作者：

Ceymann, Harald ^{[1
]}

Rosspeintner, Arnulf ^{[2
]}

Schreck, Maximilian H. ^{[1
]}

Mutzel, Carina ^{[1
]}

Stoy, Andreas ^{[1
]}

Vauthey, Eric ^{[2
]}

Lambert, Christoph ^{[1
]}

机构：

[1] Univ Wurzburg, Ctr Nanosyst Chem, Wilhelm Conrad Rontgen Res Ctr Complex Mat Syst, Inst Organ Chem, D-97074 Wurzburg, Germany

[2] Univ Geneva, Dept Phys Chem, 30 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2016年 / 18卷 / 24期

关键词：

2-PHOTON ABSORPTION; VIBRONIC CONTRIBUTIONS; OPTICAL-PROPERTIES; ONE-PHOTON; DYES; MOLECULES; CHROMOPHORES; INTENSITY; DESIGN; POLYMETHINE;

D O I：

10.1039/c6cp02312f

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The linear and nonlinear optical properties of a series of oligomeric squaraine dyes were investigated by one-photon absorption spectroscopy (1PA) and two-photon absorption (2PA) induced fluorescence spectroscopy. The superchromophores are based on two indolenine squaraine dyes with transoid (SQA) and cisoid configuration (SQB). Using these monomers, linear dimers and trimers as well as star-shaped trimers and hexamers with benzene or triphenylamine cores were synthesised and investigated. The red-shifted and intensified 1PA spectra of all superchromophores could well be explained by exciton coupling theory. In the linear chromophore arrangements we also found superradiance of fluorescence but not in the branched systems. Furthermore, the 2PA showed enhanced cross sections for the linear oligomers but only additivity for the branched systems. This emphasizes that the enhancement of the 2PA cross section in the linear arrangements is probably caused by orbital interactions of higher excited configurations.

引用

页码：16404 / 16413

页数：10

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