Synthesis and characterization of highly photoresponsive fullerenyl dyads with a close chromophore antenna–C60 contact and effective photodynamic potential
[EN] FULLERENE COMPOUNDS<br/>[FR] COMPOSES DE FULLERENES
申请人:CHIANG LONG Y
公开号:WO2004007426A1
公开(公告)日:2004-01-22
The invention relates to fullerene compounds of formula (I); in which X1, X2, X3, X4, X5, YI, Y2, V, W, F, E, R, r, n, p, and q are defined as in the specification. Also disclosed are pharmaceutical compositions containing one of the compounds described above.
Synthesis and characterization of highly photoresponsive fullerenyl dyads with a close chromophore antenna–C60 contact and effective photodynamic potential
作者:Long Y. Chiang、Prashant A. Padmawar、Joy E. Rogers-Haley、Grace So、Taizoon Canteenwala、Sammaiah Thota、Loon-Seng Tan、Kenneth Pritzker、Ying-Ying Huang、Sulbha K. Sharma、Divya Balachandran Kurup、Michael R. Hamblin、Brian Wilson、Augustine Urbas
DOI:10.1039/c0jm00037j
日期:——
We report the synthesis of a new class of photoresponsive C60âDCEâdiphenylaminofluorene nanostructures and their intramolecular photoinduced energy and electron transfer phenomena. Structural modification was made by chemical conversion of the keto group in C60(>DPAF-Cn) to a stronger electron-withdrawing 1,1-dicyanoethylenyl (DCE) unit leading to C60(>CPAF-Cn) with an increased electronic polarization of the molecule. The modification also led to a large bathochromic shift of the major band in visible spectrum giving measureable absorption up to 600 nm and extended the photoresponsive capability of C60âDCEâDPAF nanostructures to longer red wavelengths than C60(>DPAF-Cn). Accordingly, C60(>CPAF-Cn) may allow 2γ-PDT using a light wavelength of 1000â1200 nm for enhanced tissue penetration depth. Production efficiency of singlet oxygen by closely related C60(>DPAF-C2M) was found to be comparable with that of tetraphenylporphyrin photosensitizer. Remarkably, the 1O2 quantum yield of C60(>CPAF-C2M) was found to be nearly 6-fold higher than that of C60(>DPAF-C2M), demonstrating the large light-harvesting enhancement of the CPAF-C2M moiety and leading to more efficient triplet state generation of the C60> cage moiety. This led to highly effective killing of HeLa cells by C60(>CPAF-C2M) via photodynamic therapy (200 J cmâ2 white light). We interpret the phenomena in terms of the contributions by the extended Ï-conjugation and stronger electron-withdrawing capability associated with the 1,1-dicyanoethylenyl group compared to that of the keto group.