Studies on charge transfer of polyimide rings

Charge distributions, dipole monents and transition energies for model comp ounds of polyimide structure units in ground state and excited state were s tudied by ab initio calculation. Fluorescence spectra of polyimides were de termined and differences of forming charge-transfer complex between two pol yimides in excited state were explored. The results showed that large charg e transfer occurred on the imide rings consisting of 1,4-diaminobenzene and 4,4'-diaminotriphenylamine in ground state but further charge transfer occ urred on the imide ring consisting of 4,4'-diaminotriphenylamine in excited state.