The synthesis and characterization of novel phenylene bridged boron−nitrogen containing π-conjugated dendrimers N3B6 and N3B3, with peripheral boron atoms and 1,3,5-triaminobenzene moiety as a core, are presented. UV−vis absorption and emission measurements reveal that the opticalproperties of the resulting compounds can be controlled by changing the donor/acceptor ratio: a 1:1 ratio results in a
Two photon absorption energy transfer in the light-harvesting complex of photosystem II (LHC-II) modified with organic boron dye
作者:Li Chen、Cheng Liu、Rui Hu、Jiao Feng、Shuangqing Wang、Shayu Li、Chunhong Yang、Guoqiang Yang
DOI:10.1016/j.saa.2014.02.166
日期:2014.7
The plant light-harvesting complexes of photosystem II (LHC-II) play important roles in collecting solar energy and transferring the energy to the reaction centers of photosystems I and II. A two photon absorption compound, 4-(bromomethyl)-N-(4-(dimesitylboryl)phenyl)-N-phenylaniline (DMDP-CH2Br), was synthesized and covalently linked to the LHC-II in formation of a LHC-II-dye complex, which still maintained the biological activity of LHC-II system. Under irradiation with femtosecond laser pulses at 754 nm, the LHC-II-dye complex can absorb two photons of the laser light effectively compared with the wild type LHC-II. The absorbed excitation energy is then transferred to chlorophyll a with an obvious fluorescence enhancement. The results may be interesting and give potentials for developing hybrid photosystems. (C) 2014 Elsevier B.V. All rights reserved.