%0 Journal Article %T Distortions and Deformations of Metaled Meso-Substituted and Unsubstituted Porphyrins and Derivatives in Crystal Structures %A Philippe V. Tsalu %A Tharcisse O. Monama %A Hilaire V. Mambo %A Doroth¨¦e D. Tshilanda %A Pius T. Mpiana %A Bodrique M. Nsimba %A Virima Mudogo %A Pitchou N. Bokolombe %A Damien S. T. Tshibangu %A Zephyrin G. Yav %J Crystal Structure Theory and Applications %P 1-15 %@ 2169-2505 %D 2016 %I Scientific Research Publishing %R 10.4236/csta.2016.51001 %X

Experimental crystallographic structural parameters of a range of metaled meso-substituted and unsubstituted porphyrins were reviewed to show how far the meso-substitution by any functional group and the insertion of metal in the porphyrins core macrocycle may affect the geometry. The analysis of twists and angles has shown two kinds of distortions: external [T(C¦Â-C¦Á-Cmeso-Xn) and T(C¦Â-C¦Á-Cmeso-C¦Á)] and internal [T(Nm-C¦Á-Cmeso-Xn) and T(Nn-C¦Á-Cmeso-C¦Á)] with averages of [+6° and ¨C6°] and [¨C5° and +5°], respectively.

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In the meso-substituted case, the external and internal twists C¦Â-C¦Á-Cmeso-X and N-C¦Á-Cmeso-X, respectively are oppositely orientated. Similar effect is observed in meso-unsubstituted of C¦Â-C¦Á- Cmeso-H and N-C¦Á-Cmeso-H. However, the external distortions are more significant than internal. Considering the same order, the limit of distortions is [97° and 132° (¨C48°)] for external and [91° (¨C89