STRUCTURE DEPENDENCE OF INTRAMOLECULAR PHOTOINDUCED ELECTRON TRANSFER IN 9-AMINOACRIDINE BENZOYL ESTERS DYADS LINKED BY A POLYETHER CHAIN

Both experimental observations and theoretical calculations indicated that: (I) The flexible dyads reported in this paper exist preferentially in folded conformations in which the donor and the acceptor are held in close proximity. This allows overlap of the orbitals of each moiety leading to very efficient intramolecular fluorescence quenching. (ii) Quenching of the fluorescence of the donor in the dyads via electron transfer depends on the electron affinity of the acceptor. (iii) The electron-attracting ability of the acceptors in the dyads is strongly influenced by the type and relative spatial disposition of the substituents.