期刊
JOURNAL OF COMPUTATIONAL CHEMISTRY
卷 39, 期 18, 页码 1129-1142出版社
WILEY
DOI: 10.1002/jcc.24887
关键词
porphyrins; photophysics; charge transfer; spectroscopy; density functional theory
资金
- US National Science Foundation (NSF) [CHE-1610755]
- US National Institute of Health (NIH) [MBRS GM-R25-60665]
- NIH National Institute on Minority Health and Health Disparities [8G12-MD007599]
Nitro-porphyrins are an important class of commercial dyes with a range of potential applications. The nitro group is known to dramatically affect the photophysics of the porphyrin, but there are few systematic investigations of the contributing factors. To address this deficiency, we present spectroscopic studies of a series of nitro-porphyrins, accompanied by density functional theory calculations to elucidate their structures. In particular, we explore how the positions of the substituents affect the energy levels and nuclear geometry. As expected, nitro groups on the meso-phenyl rings cause small changes to the orbital energies by induction, while those at the -pyrrole positions more strongly conjugate into the aromatic system. In addition, however, we find evidence that -pyrrole nitro groups distort the porphyrin, creating two non-planar conformations with distinct properties. This unexpected result helps explain the anomalous photophysics of nitro-porphyrins reported throughout the literature, including inhomogeneous line broadening and biexponential fluorescence decay. (c) 2017 Wiley Periodicals, Inc.
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