- Association of dicyanodiphenylacetylenes with silver(I) salts in solution and solid state: Electrospray ionization mass spectrometry samples aggregates at subsaturated concentrations
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Complexes of 2,3'-dicyanodiphenylacetylene (2,3'-DCPA, 1), 2,2'-dicyanodiphenylacetylene (2,2'-DCPA, 2), and 2,4'-dicyanodiphenylacetylene (2,4'-DCPA, 3) with silver(I) salts have been characterized in the solid state by single-crystal X-ray analysis. In
- Hirsch, Keith A.,Wilson, Scott R.,Moore, Jeffrey S.
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- Block modification of rod-shaped π conjugated carbon frameworks with donor and acceptor groups toward highly fluorescent molecules: Synthesis and emission characteristics
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To create organic molecules that are highly fluorescent at a longer wavelength region, we investigated the synthesis (using Pd-catalyzed cross-coupling) and photophysical properties (Φ f, λ em, τ , λ abs, and ε ) of the following π conjugated molecular rods consisting of p-phenyleneethynylene units modified by donor (OMe) and/or acceptor (CN) groups: (1) side-donor modification systems (SD systems), (2) side-acceptor modification systems (SA systems), and (3) systems consisting of a donor block and an acceptor block (BL systems). As a consequence, very high Φ f values (>0.95) were obtained for BL systems. Bathochromic shifts of λ em for the same π conjugation length were largest for BL systems. Thus we succeeded in creating highly efficient light emitters at a longer wavelength region by block modification (e.g., Φ f = 0.97, λ em = 464 nm for BL-9). Considerably intense solid emission (Φ f ~ 0.5) at a longer wavelength region (500- 560 nm) was also found for BL systems. It has been found that BL-6 and BL-8 exhibit interesting two photon absorption characteristics. This journal is The Royal Society of Chemistry.
- Ochi, Takanori,Yamaguchi, Yoshihiro,Wakamiya, Tateaki,Matsubara, Yoshio,Yoshida, Zen-Ichi
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experimental part
p. 1222 - 1231
(2008/10/09)
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