Anthryl intramolecular charge transfer

Figure 14 Schematic representation of anthracene dimers with no parallel molecular planes (a) 55° dimer (see Ref. 88) (b) zero overlap twisted intramolecular charge-transfer type pair and (c) large overlap excimer-type conformation of anthracene units in l,l-di(9-anthryl)alkane (see Ref. 89).

As a final part of this chapter, we shall briefly discuss the intramolecular ET processes in relatively large aromatic molecules. This is a supplement to Chapter 3 in this Part, in which twisted intramolecular charge-transfer (TICT) phenomena were described for isolated donor acceptor molecules and their clusters. Here we present the charge-transfer dynamics in some selected anthryl derivatives in which the donor and acceptor parts are linked directly or by alkyl chains, and also microscopic solvation effects on the dynamic properties in their clusters, which were not discussed in the earlier chapter. The emphasis resides on a detailed description of the torsional motions and the solvation structure, which are strongly correlated with the intramolecular charge transfer in these systems. 

In the last part of this chapter, intramolecular charge transfer (ICT) in anthryl derivatives with linked donor-acceptor parts was discussed. Ultrafast spectroscopy has been applied both for structural characterization and for real-time probing of the ICT in this case. Microscopic solvation effects on the torsional motions and the ICT in the molecules have been examined by the use of their clusters with polar solvents. One of the most important problems which awaits for further studies is an ambiguous description of the electronic character of the charge-separated states in the systems. So far, high-level quantum-mechanical calculations have not been able to deal with such large molecular systems, but reliable evaluation of electronically... 

M Khajehpour, JF Kauffman. Chain relaxation kinetics in the intramolecular charge transfer reaction of l-(9-anthryl)-3-(4-dimethylaniline)propane in supercritical COo hulk solvent properties characterize reactivity. Chem Phys Lett 297 141-146, 1998. 

Photoinduced intramolecular charge transfer dynamics of 4- 9-anthryl)-Zy,N-dimethylaniline and 9,9 -bianthryl, was investigated by Nagasawa, Miyasaka and co-workers via time-resolved fluorescence spectroscopy in several ILs. It was shown that the dynamic Stokes shift in the sub-ns to ns time range was solute-dependent in PILs. This behaviour was discussed from the viewpoint of the hierarchy of the solvation dynamics. The molecular and electronic structures of six PILs,... 

Locke and Uim 2 nave reported the first example of bicemer a dimeric species formed by association of two electronically excited molecules. Charge-transfer stabilization occurs by association of two identical triplet states or intramolecular association in 1,1-di-a-naphthylethane and 1.1-di-(9-anthryl) ethane in polar solvents . ... 

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