Towards Unimolecular Luminescent Solar Concentrators: Bodipy-Based Dendritic Energy-Transfer Cascade with Panchromatic Absorption and Monochromatized Emission
作者:O. Altan Bozdemir、Sundus Erbas-Cakmak、O. Oner Ekiz、Aykutlu Dana、Engin U. Akkaya
DOI:10.1002/anie.201104846
日期:2011.11.11
A polymer‐embedded dendritic, bodipy‐based panchromatic absorber with a built‐in energy gradient concentrates incident solar radiation at a terminal chromophore, resulting in a monochromatizedemission directed to the sides of the polymer waveguide (see picture). This particular design minimizes self‐absorption losses from the peripheral antenna units with an impressive S factor of 10 000.
A series of 39 boron-dipyrrolylmethenes (BODIPYs) have been synthesized and characterized. Their spectroscopic properties, degree of lipophilicity, chemical stability under irradiation, and singlet-oxygen generation rate have also been studied. These compounds differ in the presence of ethyl groups (group A), hydrogens (group B) or iodines (group C) on the 2,6 positions; these appendices confer particular characteristics to each group. The presence of an aromatic substituent or hydrogen on the indacene 8 position produces 13 different molecules of each group. Besides the effects exerted by the group or atom on the 2,6 positions, the substituent on the 8 position exerts a further effect on the physico-chemical parameters, thus the desired properties of BODIPYs, concerning fluorescence, lipophilicity, and singlet oxygen production can be modulated accordingly. (C) 2013 Elsevier Ltd. All rights reserved.