Dynamics of Water-Soluble Stilbene Dendrimers upon Photoisomerization

摘要: The energy-releasing process and the conformational dynamics of water-soluble stilbene dendrimers upon photoexcitation are studied by time-resolved transient grating method. While energy relaxation change completed within 30 ns for first generation (W-G1), slower observed second (W-G2) third (W-G3) generations. enthalpy photoisomerization increases becomes with an increase in generation. diffusion coefficients (D) trans- cis-forms W-G2 W-G3 almost same, whereas a slight difference is W-G1. These characteristic features consistently explained terms electric charges on dendron surface.