Journal
PHOTOCHEMISTRY AND PHOTOBIOLOGY
Volume 90, Issue 2, Pages 402-414Publisher
WILEY-BLACKWELL
DOI: 10.1111/php.12203
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Funding
- US National Science Foundation (NSF) [CHE-0517782, CHE-1058846]
- National Institutes of Health [GM-34548]
- Pfizer Undergraduate Summer Research Fellowship
- Harold S. Schwenk Sr. Distinguished Chair in Chemistry
- NSF [CHE-1048717]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1058846] Funding Source: National Science Foundation
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The unique optical properties of free-base meso-tris(5-methylthien-2-yl)corrole were compared to those of the widely investigated meso-triphenyl-substituted analogue. A combination of spectroscopic and computational experiments was undertaken to elucidate the relationship between structural features of the neutral, mono-anionic and mono-cationic forms of the corroles and their corresponding optical properties. A general bathochromic shift was measured for the thienyl-substituted corrole. The experimental spectra are supported by excited state calculations. A systematic series of ground state minimizations were performed to determine energy minima for the flexible and solvent-sensitive molecules. Trithienylcorrole was found to have a more nonplanar macrocycle in conjunction with a high degree of pi-overlap with the meso-substituents. Both structural features contribute to their bathochromically shifted optical spectra. The configurational character of the thienyl-substituted corrole is shown to have a larger degree of molecular orbital mixing and doubly excited character, which suggest a more complex electronic structure that does not fully adhere to the Gouterman four-orbital model. The reactivity of the thienyl groups, particularly with respect to their ability to be (electro)-polymerized, combined with the tight coupling of the meso-thienyl groups with the corrole chromophore elucidated in this work, recommends the meso-thienylcorroles as building blocks in, for instance, organic semiconductor devices.
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