Photoinduced energy transfer in bichromophoric co-assemblies based on amphiphilic poly(amidoamine) dendrons

• Published in: Journal of colloid and interface science Vol. 324; no. 1; pp. 225 - 229
• Main Authors: Wang, Bing-Bing, Gao, Min, Jia, Xin-Ru, Li, Wu-Song, Jiang, Lei, Wei, Yen
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 01.08.2008; Elsevier
• Subjects: [formula omitted] stacking; Amphiphilic poly(amidoamine) dendrons; Carbazoles - chemistry; Chemistry; Co-assemblies; Colloidal state and disperse state; Dendrimers - chemical synthesis; Dendrimers - chemistry; Energy transfer; Exact sciences and technology; Fluorescence Resonance Energy Transfer; General and physical chemistry; Photochemistry; Polyamines - chemistry; Pyrenes - chemistry; Spectrum Analysis; Surface physical chemistry; Amphiphilic poly(amidoamine) dendrons; Energy transfer; π – π stacking; Co-assemblies; Water; Hydrocarbon; Stacking; Hydrogen; Fluorescence; Condensed benzenic compound; Carbazole; Stack; Aggregation; Pyrene; Resonance; π-π stacking; Chromophore
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2008.04.032

Spherical co-assemblies were generated from an equivalent-molar-ratio mixture of amphiphilic poly(amidoamine) dendrons that were modified with focal carbazole and/or pyrene chromophores from the first to the third generation (D nCz I and D nPy, where n = 1 , 2, 3 denotes the generation of dendrons) in water at a concentration of 3.0 × 10 −6 M , lower than the individual critical aggregation concentrations (CAC) of either D nCz I or D nPy. UV–vis absorption and fluorescence emission spectra indicated that fluorescence resonance energy transfer (FRET) from carbazole to pyrene units occurred efficiently within the co-assemblies. Further study implied that part of the carbazole and/or pyrene units stacked homogeneously in the co-assemblies via π – π stacking and the dendritic branches served as connectors due to the hydrogen-bonding interaction. Spherical co-assemblies were generated from the mixture of poly(amidoamine) dendrons modified with carbazole and/or pyrene chromophores. Energy transfer from carbazole to pyrene units occurred efficiently within these co-assemblies.