Heterosupramolecular Chemistry: The Self-Assembly and Self-Organization of Nanoscale Devices and Materials in Solution

摘要

TiO_2 nanocrystallites have been prepared by hydrolysis of titanium tetraisopropoxide in the presence of a stabiliser modified by incorporation of adiaminopyridine moiety. The latter selectively bind, by complementary hydrogen bonding, viologens modified by incorporation of a uracil moiety. Bandgap excitation of a semiconductor nanocrystallite results in electron transfer to a bound viologen. TiO_2 nanocrystallites have also been prepared by hydrolysis of titanium tetraisopropoxide in the presence of a stabilisfer modified by incorporation a uracil moiety. The latter are selectively bound by TiO_2 nanocrystallites prepared in the presence of a stabiliser modified by a diaminopyridine. Subsequent self-organisation yields an ordered array, or superlattice, of these semiconductor nanocrystallites. some implications of these and related findings for the bottom-up assembly of nanometer scale devices and materials in solution are considered.