Optical chromophore containing aromatic

Many of the hyperbranched polymers contain aromatic chromophores in their 7r-conjugated structures and should show interesting optical properties [31]. This is indeed the case. For example, hb-P20 carries the TPA chro-mophore, which is often used as hole-transport materials in the fabrication of light-emitting diodes [120]. The Aab of triyne 20 appeared at 342 nm (Fig. 5),... 

Kimura, et al. synthesized polymers bearing oligo-aromatic esters as side chains to form second-order nonlinear optical active polymers on the basis of architecture. The cut-off wavelength ( co) of these polymers is shorter than the visible region, i.e., kco ca. 330-370 nm, which are much shorter than the typical second order nonlinear optics polymer containing chromophores like azobenzene. These polymer films exhibit good transparency in the visible region. The second-order nonlinear optical coefficient, is 2.2-9.S pm.V... 

Studies on the chiroptical properties of polypeptides containing aromatic side-chain chro-mophores are in general complicated by strong overlapping contributions from peptide and side-chain chromophores. Nevertheless such investigations are essential in order to know the details of the aromatic contributions to the optical activity as related to the structure, especially in connection with aromatic Cotton effects observed in CD spectra of proteins. The CD bands associated with tyrosyl-, tryptophanyl-, histidyl-, and phenyl-alanyl-residues in proteins are very sensitive probes of local conformations and could yield valuable structural information. 

Synthesis of Aromatic Pofyethers Containing Nonlinear Optical Chromophores... 

A substantial improvement in analysis of macromolecular conformation in solution by chiroptical techniques, in particular CD, has been achieved by studying copolymers of optically active "transparent" monomers with comonomers containing an aromatic chromophore, which acts as spectroscopic probe. ... 

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