Interaction between monomeric units of donor-acceptor-functionalized azobenzene dendrimers: effects on macroscopic configuration and first hyperpolarizability

Article Abstract:

Ab initio molecular orbital calculations for 4-(dimethylamino)-4'-carboxyazobenzene and 4-(dimethyl-amino)-2'-nitro-4'-carboxazobenzene monomers, covalently bonded dimers is studied. The findings of the study indicate that the interaction between monomeric units of azobenzene dendrimers could be attributed to the noncentrosymmetric arrangement of the dendrimers and the monomeric units, which are in series, may be responsible for the increased first hyperpolarizability.

Azo compounds

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Conductivity measurement of polydiacetylene thin films by double-tip scanning tunneling microscopy

Article Abstract:

The conductivity of polydiacetylene thin films is evaluated in the region below 20micrometer using a newly constructed independently driven double-tip tunneling microscope. The polydiacetylene thin films fabricated by means of the Langmuir-Blodgett method showed the formation of islands with sizes of 2-20 micrometer with the polydiacetylene backbone extended in one direction in each island.

Semiconductors and related devices, Semiconductor and Related Device Manufacturing, Thin Film Materials, Analytical Laboratory Instrument Manufacturing, Analytical instruments, Scanning Microscopy, Usage, Thin films, Dielectric films

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Ultrafast dynamics of electronic excitations in a light-harvesting phenylacetylene dendrimer

Article Abstract:

A study was conducted, by using the femtosecond degenerate pump-probe spectroscopy, to investigate the ultrafast dynamics of electronic excitations in the nanostar dendrimers. The transients reveal several components with relaxation times ranging from several hundred femtoseconds to tens of picoseconds, depending on the excitation wavelength.

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