The H?type and J?type aggregates exhibit distinctly different photophysical properties in absorption, fluorescence, and excited state lifetime. Remarkably, we find that the two derivatives that assemble into J?type aggregates exhibit a significantly enhanced photovoltaic performance compared to the two molecules that form H?type aggregates.
1/31/2011 · Possible Formation of H- type Aggregates in H2TPyP/PMMA Guest Host Films – Volume 1212 – Wesley da Silva Mota, Wanessa Canedo Melo, Luiz Antônio de Oliveira Nunes, Antônio Eduardo da Hora Machado, Alzir Azevedo Batista, Ilde Guedes, Newton Martins Barbosa, The results indicate that ChTPV exhibits helical H- type nano- aggregates in 80% H 2 O/THF mixed solvents, and the negative exciton coupling suggests that the chromophoric dipoles are oriented in a counter-clockwise direction.
(CP) chain and H-type coupling of chromophores between chains of aCPcompete,asuperposition of the spectral modifications arising from each type of coupling emerges, making the two couplings hardtodiscern in the ensemble.We introduce asingle-molecule H-type aggregate of fixedspacing and variable length of up to 10 nm. HJ-type aggregate, The premicellar surfactant?porphyrin aggregate is identified by absorption and fluorescence spectroscopy, fluorescence lifetime and anisotropy, and resonance light scattering. The spectroscopic results are used to characterize the premicellar aggregates as J-type, H-type, or nonspecific aggregates.
