Download PDF by M. Hatano: Induced Circular Dichroism In Biopolymer-Dye Systems

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By M. Hatano

ISBN-10: 0387158545

ISBN-13: 9780387158549

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6) [31]. Unfortunately, most Ru(II)-bis-terpy type complexes are poor luminophores [26], even if several preparative approaches have afforded species with Fig. 6 Chemical structure of compounds 122+ 54 E. Baranoff et al. 73 Refs. 8 MLCT Room temperature, in air-equilibrated acetonitrile unless otherwise indicated, PF–6 salts Lowest energy band(s) with ε > 1000 Highest energy peak maximum In square brackets, values in degassed solvent Energy content of the luminescent level estimated from fits of the luminescence profile at room temperature or from the luminescence band maximum at 77 K Alcoholic solvent The emission properties undergo changes in protic solvent Not determined From Photoinduced Charge Separation to Light-driven Molecular Machines 55 significantly enhanced luminescence properties [40–43].

Another attempt that was tried in order to improve the performances of the arrays was the introduction of some change on the structure of the central Ru(terpy)2+ 2 , which could result in an increase of the lifetime of the complex at room temperature, while still maintaining the favourable geometry of the terpy ligand [25]. We reasoned that a longer lifetime of the excited metal complex unit would have allowed its use as a photosensitizer, in addition to its use as an electron relay, thus increasing the efficiency of CS upon excitation in the visible range at room temperature.

The (Ph4 P)+ salt is a monomer. The A. 07 ˚ + + Rb , and Cs infinite linear chains with alternating long and short Au · · · Au distances are found while the (Me4 N)+ salt forms a kinked trimer with two different Au · · · Au distances. These all show different emission maxima in the 450 to 750 nm range. As suggested previously [52], the λmax (emission) should correlate inversely with the Au · · · Au distance. Figure 28 shows a plot of λmax (emission) versus the reciprocal of the shortest Au · · · Au distance for these salts.

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Induced Circular Dichroism In Biopolymer-Dye Systems by M. Hatano


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