A unidirectional ensemble of hemicyanine molecules was prepared by inserting the molecules into the vertical channels of a uniformly oriented zeolite (silicalite-1) film grown on a glass substrate. Fluorescence from this sample excited with light polarized along the vertical channel was 50 times larger than that excited with light polarized orthogonal to the vertical channel direction. These ve...

Third-harmonic generation (THG) spectroscopy was performed for oligo(1,4-phenyleneethynylene)s (OPEs) with terminal donor-acceptor (DA) substitution and compared to the results of merely donor substituted OPEs and regular OPE chains with 2,5-dipropoxy benzene rings. Both, extension of the conjugation and push-pull effect enhance the molecular hyperpolarizability gamma, even for the DAOPEs, whic...

This work investigates the structural and nonlinear optical properties of a D-A type 1-[4-({(E)-[4-(methylsulfanyl)phenyl]methylidene}amino)phenyl]ethanone, MMP in which charge transfer occurs from -SCH3 donor to -COCH3 acceptor group through methylidene backbone; and some of its modeled analogues using quantum chemical calculations with pure BLYP and hybrid B3LYP correlation with high basis se...

Lasse Jensen,*,† Kristian O. Sylvester-Hvid,‡ Kurt V. Mikkelsen,‡ and Per-Olof Åstrand§ Theoretical Chemistry, Materials Science Centre, RijksuniVersitet Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands, Department of Chemistry, UniVersity of Copenhagen, UniVersitetsparken 5, DK-2100 Copenhagen Ø, Denmark, Department of Chemistry, Norwegian UniVersity of Science and Technology, N-749...

A series of alpha,omega-diarylpolyynes has been synthesized. In addition to the synthesis of three hexaynes (3a-c), a notably improved synthesis of 1,16-diphenylhexadecaoctayne (5) is described. The third-order nonlinear optical characteristics for these molecules have been studied and show a substantial increase in molecular hyperpolarizability (gamma) as a function of increasing length. The u...

The third-order nonlinear optical properties and optical limiting studies of donor substituted hydrazone derivatives were investigated using the single beam Z-scan technique at 532nm.The calculated values of nonlinear refractive index ,third-order nonlinear optical susceptibility and second order molecular hyperpolarizability are of the order of esu 11 10 , esu 13 10 and esu 31 10 respectively....

Abstract Several properties of a series novel disubstituted pentacenes, in which the substituents are donor and acceptor groups, were investigated by using ab initio methods. In particular, role different substitution positions for group was explored. Calculations predict that pentacene derivatives highly soluble oxidatively stable than unsubstituted pentacene. Simulated absorption spectra show...