Photochemical Transformations Involving Porphyrins and Phthalocyanines
Citation:
Photochemical Transformations Involving Porphyrins and Phthalocyanines, Griesbeck, A.; Oelgemoeller, M.; Ghetti, F., CRC Handbook of Organic Photochemistry and Photobiology, Boca Raton, CRC Press, 2012, 831 - 879, Sergeeva, N. N.; Senge, M. O.Download Item:
Abstract:
Photochemistry of the porphyrins and their relatives has been largely inspired by photosynthetic
processes in nature. As a result of this, most current studies generally utilize the chemistry of
magnesium and zinc porphyrin analogues. Especially, magnesium tetrapyrrole chelates, i.e.
magnesium porphyrins and phthalocyanines have found wide interest. This is primarily related to
the biological relevance of magnesium porphyrins in nature, notably in photosynthesis and
electron transfer (ET), and thus we will focus on this aspect in this review. Outside these areas
not many "true" photochemical studies have been performed with magnesium tetrapyrroles.
Although porphyrins and especially phthalocyanines are stable compounds, both will undergo
photooxidative degradation or photoexcited ET reactions. An additional problem of magnesium
complexes is their low stability in aqueous solution, as they are prone to demetallation. As a
result of this, many photochemical studies targeted at modeling the natural situation use the more
stable zinc complexes. Zinc derivatives exhibit photochemical properties similar to the natural
magnesium derivatives while being more stable and easier to synthesize (Li et al. 1997).
Secondly, the propensity of zinc to act as an acceptor atom is used in many supramolecular
approaches and/or for the modulation of chromophore properties via axial ligand binding. Thus,
due to their biological relevance, technical importance and good stability, substituted zinc
tetrapyrrole have found significant use as industrial pigments, electron transfer components, for
photochemical transformations and in photobiotechnology. Likewise, industrial attention has
been given to the stable copper derivatives and copper tetrapyrroles have found industrial uses
for oil desulfurization, as photoconducting agents in photocopiers, deodorants, germicides,
optical computer disks, semiconductor devices, photovoltaic cells, optical and electrochemical
sensing, and as molecular electronic materials.
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http://people.tcd.ie/sengemDescription:
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Author: SENGE, MATHIAS
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CRC Handbook of Organic Photochemistry and PhotobiologyPublisher:
CRC PressType of material:
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978-1-4398-1181-8Metadata
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