Polyimide dendrimers containing multiple electron donor-acceptor units and their unique photophysical properties.
A high-yielding synthesis of a series of polyimide dendrimers, including decacyclene- and perylene-containing dendrimer D6, in which two types of polyimide dyes are present, is reported. In these constructs, the branching unit is represented by trisphenylamine, and the solubilizing chains by N-9-heptadecanyl-substituted perylene diimides. The photophysical properties of the dendrimers have been studied by absorption, steady-state, and time-resolved emission spectroscopy and pump-probe transient absorption spectroscopy. Photoinduced charge-separated (CS) states are formed on the femtosecond timescale upon visible excitation. In particular, in D6, two different CS states can be formed, involving different subunits that decays independently with different lifetimes (ca. 10-100 ps).
Department of Chemistry and Biochemistry, Department of Materials, Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106 (USA).
Francesca M
FM
Toma
Dipartimento di Scienze Chimiche, Università di Messina and Centro Interuniversitario per la Conversione Chimica dell'Energia Solare (SOLARCHEM, Sezione di Messina), Via F. Stagno d'Alcontres 31, 98166, Messina (Italy).
Fausto
F
Puntoriero
Department of Chemistry and Biochemistry, Department of Materials, Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106 (USA).
Toan V
TV
Pho
Dipartimento di Scienze Chimiche, Università di Messina and Centro Interuniversitario per la Conversione Chimica dell'Energia Solare (SOLARCHEM, Sezione di Messina), Via F. Stagno d'Alcontres 31, 98166, Messina (Italy).
Marcello
M
La Rosa
Department of Chemistry and Biochemistry, Department of Materials, Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106 (USA).
Young-Si
YS
Jun
Department of Chemistry and Biochemistry, Department of Materials, Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106 (USA).
Bertrand J
BJ
Tremolet de Villers
Department of Chemistry and Biochemistry, Department of Materials, Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106 (USA).
James
J
Pavlovich
Department of Chemistry and Biochemistry, Department of Materials, Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106 (USA).
Galen D
GD
Stucky
Dipartimento di Scienze Chimiche, Università di Messina and Centro Interuniversitario per la Conversione Chimica dell'Energia Solare (SOLARCHEM, Sezione di Messina), Via F. Stagno d'Alcontres 31, 98166, Messina (Italy). campagna@unime.it.
Sebastiano
S
Campagna
Department of Chemistry and Biochemistry, Department of Materials, Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106 (USA). wudl@chem.ucsb.edu.
Fred
F
Wudl
antenna systems; dendrimers; donor-acceptor systems; polycycles; ultrafast spectroscopy