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| Format: | Artículo Open Access |
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Wiley
2025
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| Online Access: | https://onlinelibrary.wiley.com/doi/10.1111/php.70018 |
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Table of Contents:
- Database of low‐temperature absorption and fluorescence spectra of native photosynthetic tetrapyrrole macrocycles Dariusz M. Niedzwiedzki Masahiko Taniguchi Jonathan S. Lindsey Photochemistry and Photobiology Abstract Low‐temperature (77 K) absorption and fluorescence spectra of 12 naturally occurring photosynthetic tetrapyrrole macrocycles have been recorded in a frozen glass (2‐methyltetrahydrofuran). The compounds encompass distinct chromophore classes: porphyrin, chlorophyll c 2 ; chlorin, chlorophylls a , b , d , f and bacteriochlorophylls c , d , e , f ; and bacteriochlorin, bacteriochlorophylls a , b , g . The spectra are compared with those of the same pigment in liquid solution (predominantly 2‐methyltetrahydrofuran) at room temperature (293 K). The measured Stokes shifts at 77 K across the 12 macrocycles range from ~30 to 300 cm −1 . The spectral data in digital form are made available as part of the PhotochemCAD databases. Literature searches have revealed extensive published data for Chl a (often in biological matrices) but at best rather limited data for less common macrocycles. The availability of a systematic collection of curated spectral data collected at low temperature should be useful for a variety of assessments, including reconstruction of absorption spectra of (bacterio)chlorophyll‐containing protein complexes, vibrational analysis of absorption and fluorescence spectra, and calculations where knowledge of energy levels is important. 10.1111/php.70018 http://creativecommons.org/licenses/by-nc-nd/4.0/