Synthesis and H-aggregation of a Novel Polyelectrolyte Bearing Branched Azo Side Chains

Abstract

Abstract: A novel polyelectrolyte bearing branched azo side chains, MAPB₆P-AA, was synthesized and characterized. H-aggregation of the azo chromophores of MAPB₆P-AA in N,N-dimethylformamide(DMF)/H₂O mixed solvent was studied by UV-Vis spectroscopy. The experimental results show that the critical volume fraction for MAPB₆P-AA to form H-aggregates in the mixture of DMF and H₂O is 11%. It is van der Waals force associated with the delocalized electrons of azobenzene chromophores that provides a driving force for the aggregation. Compared with low-molecular-weight azo molecules such as MAPB₆ and MAPB₆P, polymer MAPB₆P-AA has a stronger aggregation tendency, which suggests that hydrophobic interaction and polymeric linkages also play a significant role in the formation of H-aggregation. In addition, the influence of H-aggregation of the azo chromophores on their photoresponsive behavior was also studied. A significant decrease of the trans-to-cis isomerization rate and the cis isomer content at photo-stationary state was observed.

Key words: Branched side chains, Azo polyelectrolyte, Mixed solvent, H-aggregation, Photoresponsive behavior

CLC Number:

O631

TrendMD:

DENG Yong-Hong, TUO Xin-Lin, CHENG Hao, WANG Xiao-Gong . Synthesis and H-aggregation of a Novel Polyelectrolyte Bearing Branched Azo Side Chains[J]. Chem. J. Chinese Universities, 2003, 24(7): 1320.

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Synthesis and H-aggregation of a Novel Polyelectrolyte Bearing Branched Azo Side Chains

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