SYSTEMS OF ORGANIC PHOTON-GATED PHOTOCHEMICAL HOLE BURNING

We report a new series of organic systems for photon-gated photochemical hole burning by donor-acceptor electron transfer at 4.2 K. The donor molecules (RZT) are meso-tetraaryl derivatives of zine-tetrabenzoporphyrin: the aryls are phenyl (PZT), p-tolyl (TZT), and alpha-naphthayl (NZT), respectively. The acceptor can be one of several aromatic cyanides (AC's), e.g., dicyanobenzene, cyanonaphthalene, or cyanoanthracene. These new systems have an inhomogeneously broadened optical transition centered at 627 nm with a FWHM that varies from 330 to 390 cm-1 depending on the concentration of the donor and the acceptor in the polymethyl methacrylate (PMMA) matrix. The RZT-AC-PMMA systems exhibit typical photon-gated spectral hole-burning characteristics, and multiple gated holes can easily be burned.