Time-resolved EPR studies of photogenerated radical ion pairs separated by p-phenylene oligomers and of triplet states resulting from charge recombination

Article Abstract:

Time-resolved EPR (TEPR) spectroscopy is used to study the spin dynamics in a series of D-B-A molecules (D= phenothiazine (PTZ), B = p-phenylene ([Ph.sub.n]), n=1-5 and A = perylene-3,4:9,10-bis(dicarboximide) (PDI)). The spin-orbit-intersystem crossing (SO-ISC) mechanism is a result of direct charge recombination, which also requires the initial radical pair (RP) intermediate and depends strongly on the orientation of the molecular orbitals involved in the charge recombination as well as the magnitude of 2J.

Usage, Electron paramagnetic resonance spectroscopy, Oligomers, Chemical properties, Molecular orbitals

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Controlling the energy transfer in dipole chains

Article Abstract:

The control of pulselike energy propagation through one-dimensional arrays of dipoles is discussed by exploring three systems. In the first system, a chain of coaxial dipoles is gated by two control dipoles whereas in the other two systems, the chain--branch system and the two-branch system, two chains are used as an input and the propagation of energy is controlled by sending one or two signals towards the junction.

Energy transformation

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Molecular dipole chains II

Article Abstract:

Excitation and dissipation processes of molecular dipoles with fixed centers have been investigated. Temperature fluctuation, dipole-dipole time correlation function, Fourier correlation function density and dispersion relation are discussed.

United States, Netherlands, Chemistry, Physical and theoretical, Physical chemistry, Molecules

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