Two new sterically hindered phthalocyanines: synthetic and photodynamic aspects.

Abstract:

:The synthesis and the properties of 1,4-dibutoxy-2,3-dicyanotriptycene, of a metal-free tetradibenzobarrelenooctabutoxyphthalocyanine, and of the corresponding zinc phthalocyanine are described. The two phthalocyanines do not aggregate when dissolved in benzene at concentrations up to 450 microM. For the metal-free and the zinc compounds, the red band maxima are at 736 and 757 nm, the triplet maxima are at 590 and 605 nm, the triplet state lifetimes are 58 and 177 microseconds, and the protoporphyrin-IX dimethyl ester-to-compound bimolecular rate constants for triplet energy transfer are 2.61 x 10(8) and 1.47 x 10(8) M-1 s-1. Triplet energy transfer from the metal-free compound to O2 is endoergonic by 1.0 kcal mol-1. The potential of the zinc compound for photodynamic therapy is touched upon.

journal_name

Photochem Photobiol

authors

Rihter BD,Bohorquez MD,Rodgers MA,Kenney ME

doi

10.1111/j.1751-1097.1992.tb08510.x

subject

Has Abstract

pub_date

1992-05-01 00:00:00

pages

677-80

issue

5

eissn

0031-8655

issn

1751-1097

journal_volume

55

pub_type

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