Molecular complexes with interacting van der Waals and ionic excited states. 2. Electronic spectra of jet-cooled complexes

Abstract

Fluorescence excitation spectra, fluorescence spectra, and fluorescence decay times were measured for a series of anthracene and perylene complexes with benzene derivatives formed in a supersonic expansion. The results are discussed on the basis

Fluorescence Properties and Exciplex Formation of Emissive Naphthyridine Derivatives: Application as Sensors for Amines

“…Tramer et al. reported that CT complexes can be classified into three cases having different values of Δ Ε [Eq. ]: …”

Excited States of Intermolecular Electron-Donor-Acceptor Systems and Internal Geometry of Complex' Components

“…As was mentioned earlier the geometries of both the isolated donor and acceptor molecules are practically the same as those in GAD structure of their complex and this leads to the conclusion that this value of the energy of formation is practically determined by the intermolecular interactions between the donor and acceptor. In general, such small values of the energy of formation are characteristic of weak van der Waals complexes [3,6].…”

“…donor and acceptor molecules [2][3][4][5][6][7] -thus bypassing the problem of internal structure of complex' components. Such an assumption may be acceptable in the case of very weak complexes (this is often the case of EDA system in the ground state) but it may be insufficient for the description of the excited charge-transfer (CT) states in which interactions between A and D are relatively strong [1-4, 6, 7].…”

“…Such an assumption may be acceptable in the case of very weak complexes (this is often the case of EDA system in the ground state) but it may be insufficient for the description of the excited charge-transfer (CT) states in which interactions between A and D are relatively strong [1-4, 6, 7]. The experimental investigations of the excitation and fluorescence spectra of EDA systems indicate that vibrational frequencies of the component molecules are changing upon the formation of the complex [3,6,8]. This means that the internal structure of complex' components changes, however an estimation of the contribution of energy due to such changes to the energy of formation of CT state has been discussed only occasionally [9][10][11] and still remains an open question.…”

“…(i) the exciplex reaction [2,3,6] which takes place between the primarily excited acceptor (donor) molecule and unexcited donor (acceptor) molecule where hvA is the excitation energy of isolated acceptor molecule and (A -D+) denotes CT state of EDA system;…”