Photoproperties of alkoxy-substituted phthalocyanines with deep-red optical absorbance.
Photoproperties of alkoxy-substituted phthalocyanines with deep-red optical absorbance.
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具有深红色吸光度的烷氧基取代酞菁的光特性。
DOI：
10.1111/j.1751-1097.1989.tb04160.x
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发表时间：
1989
影响因子：
3.3
通讯作者：
Rodgers,MA
中科院分区：
文献类型：
--
作者：
Ford,WE;Rihter,BD;Kenney,ME;Rodgers,MA
Triplet‐state properties of 1,4,8,11,15,18,22,25‐octa‐n‐butoxy phthalocyanine and its zinc derivative were determined for the first time. The T1state of the metal‐free phthalocyanine was characterized by a short lifetime (τT= 17 µs) and low quantum yield (φT= 0.095), and quenching of the triplet by O2occurred with a bimolecular rate constant (kTσ= 1.3 times 108M‐1s‐1) that is indicative of an endogonic reaction. The zinc complex (ZnPc(OBu)8) was markedly better as a triplet photosensitizer with respect to both tT(60 µs) and φT(0.5). Quenching by O2produced singlet oxygen with nearly 100% efficiency, andkTσ(1.7 times 109M‐1s‐1) was close to the spin‐statistical diffusion‐controlled limit. Phosphorescence measurements showed the energy of the T1state of ZnPc(OBu)8to be 100 kJ/mol, which is 6 kJ/mol above thelδgstate of O2. These photoproperties, together with Q‐band absorption maxima in the mid‐700 nm range indicate that metal‐centered 1,4,8,11,15,18,22,25‐octaalkoxyphthalocyanines have excellent potential as sensitizers in photodynamic therapy.
