Photophysical Properties and Electronic Structure of Chlorin-Imides: Bridging the Gap between Chlorins and Bacteriochlorins.

The journal of physical chemistry. B 2015 Jun 18

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Efficient light harvesting for molecular-based solar-conversion systems requires absorbers that span the photon-rich red and near-infrared (NIR) regions of the solar spectrum. Reported herein are the photophysical properties of a set of six chlorin-imides and nine synthetic chlorin analogues that extend the absorption deeper (624-714 nm) into these key spectral regions. These absorbers help bridge the gap between typical chlorins and bacteriochlorins. The new compounds have high fluorescence quantum yields (0.15-0.34) and long singlet excited-state lifetimes (4.2-10.9 ns). The bathochromic shift in Qy absorption is driven by substituent-based stabilization of the lowest unoccupied molecular orbital, with the largest shifts for chlorins that bear an electron-withdrawing, conjugative group at the 3-position in combination with a 13,15-imide ring.

Citation

Kaitlyn M Faries, James R Diers, Joseph W Springer, Eunkyung Yang, Marcin Ptaszek, Dorothée Lahaye, Michael Krayer, Masahiko Taniguchi, Christine Kirmaier, Jonathan S Lindsey, David F Bocian, Dewey Holten. Photophysical Properties and Electronic Structure of Chlorin-Imides: Bridging the Gap between Chlorins and Bacteriochlorins. The journal of physical chemistry. B. 2015 Jun 18;119(24):7503-15