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Syntheses and Photochemistry of Fluorinated and Chlorinated Titanium Porphyrinates: Crystal Structure of Oxotitanium meso ‐Tetrakis(2,3,4,5,6‐pentafluorophenyl)porphyrinate
Author(s) -
Esser Peter E.,
Englert Ulli,
Keim Wilhelm
Publication year - 1996
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19961290715
Subject(s) - chemistry , hydrogen peroxide , aqueous solution , singlet oxygen , titanium , photochemistry , crystal structure , porphyrin , titanium tetrachloride , peroxide , polymer chemistry , oxygen , crystallography , organic chemistry
The syntheses of oxotitanium(IV) meso ‐tetrakis(2,3,4,5,6‐pentafluorophenyl)porphyrinate O=Ti(TPPF 20 ) ( 1 ), oxotitanium(IV) meso ‐tetrakis(2,6‐difluorophenyl)porphyrinate O=Ti‐(TPPF 8 ) ( 3 ), and oxotitanium(IV) meso ‐tetrakis(2,6‐dichlorophenyl)porphyrinate O=Ti(TPPCl 8 ) ( 5 ) from titanium tetrachloride and the corresponding porphine are described. The structure of 1 was determined by single‐crystal X‐ray diffraction. The reaction of oxotitanium porphyrinates with aqueous hydrogen peroxide leads to the corresponding light‐sensitive peroxotitanium(IV) complexes: Ti(O 2 )(TPPF 20 ) ( 2 ), Ti(O 2 )‐(TPPF 8 ) ( 4 ), Ti(O 2 )(TPPCl 8 ) ( 6 ). All complexes are efficient and stable photosensitizers for the generation of singlet oxygen.