期刊
JOURNAL OF PORPHYRINS AND PHTHALOCYANINES
卷 20, 期 1-4, 页码 282-291出版社
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S1088424616500048
关键词
relaxation times; quantum yields; triplet state; donor/acceptor groups; excited state spectroscopy; porphyrins
资金
- Science Foundation Ireland [14/TIDA/2362, 13/1A/1894]
- European Commission H2020-MSCA-IF fellowship [655142-CONSORT]
- FAPESP (Fundacao de Amparo a Pesquisa do estado de Sao Paulo) [2011/12399-0, 2009/11810-8]
- FAPEMIG (Fundacao de Amparo a Pesquisa do estado de Minas Gerais)
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
- CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior)
- Air Force Office of Scientific Research [FA9550-12-1-0028]
Excited state dynamics, particularly intersystem crossing, of a set of meso-substituted porphyrins bearing different electron-donor and acceptor groups was studied by pulse train fluorescence technique. Triplet quantum yield was found to be critically dependent on the nature of meso-substituents in the porphyrin system. Porphyrins with meso methoxyphenyl groups were found to show high triplet quantum yields (phi(T) between 0.70 and 0.81). Moreover, the quantity of methoxyphenyl groups and the substitution pattern directly influence phi(T). Alternatively, porphyrins attached to nitrophenyl group possess low triplet quantum yield values (similar to 0.3). The observed structure-properties relationships suggest new ways for tuning the optical properties of porphyrins via chemical modification.
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