Index of Organic Compounds for Dye Lasers V

MAEDA, Mitsuo

doi:10.2184/lsj.9.190

Cited by 7 publications

(6 citation statements)

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“…We used two xanthene dyes, fluorescein and eosin Y, as the sensitizers (Scheme 1) because they have high molar extinction coefficients for harvesting light energy 42 and a high solubility into ethanol used as the solvent of the sol−gel systems. The co-dispersion of the two dyes on the titania surface can effectively prevent the dye aggregation and enhance the visible light response.…”

Section: −11mentioning

confidence: 99%

Influence of dye dispersion on photoelectric conversion properties of dye-containing titania electrodes

Nishikiori

Setiawan

Miyashita

et al. 2013

Catal. Sci. Technol.

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The dye-dispersing titania electrodes were prepared from the dye-containing titanium alkoxide sols by a room temperature sol−gel process and steam treatment at 110°C. The spectroscopic and photoelectric conversion properties of the electrodes were investigated in order to clarify the influences of the dye dispersion and the co-dispersion of the two dyes on the electron transfer process. The fluorescein and eosin Y molecules were dispersed into the titania as their monomers. The shapes of the photocurrent action spectra of the fluorescein and/or eosin Y-dispersing titania electrodes well corresponded to those of their absorption spectra because the excited electrons in the dyes were directly injected into the titania conduction band without any interaction between the dye molecules, such as energy transfer.This result indicated that the dye molecules were separately encapsulated in the pores between the titania nanoparticles and tightly adsorbed or bonded to the titania particle surface. The internal quantum efficiency of the photoelectric conversion was higher than that of the conventional dye-adsorbing titania electrodes in which the dye molecules were easily aggregated, thus deactivated by the energy transfer. The co-dispersion of the two dyes on the titania surface allowed to effectively extend the visible light region for the photoelectric conversion.3

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Section: −11mentioning

confidence: 99%

Influence of dye dispersion on photoelectric conversion properties of dye-containing titania electrodes

Nishikiori

Setiawan

Miyashita

et al. 2013

Catal. Sci. Technol.

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“…It gives laser emission around 453 nm in ethanol (Maeda, 1984). The crystal structure was determined as part of our structural studies on laser dyes.…”

Section: Commentmentioning

confidence: 99%

Coumarin 311

Yip¹,

YAW²,

Ong³

et al. 1995

Acta Crystallogr C

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“…The title compound, (I), a dgidized aminocoumarin, has attracted extensive study since it has been used as a laser dye (Maeda, 1984; Pdyadarsini, Naik & Moorthy, 1989;Kunjappu, 1993;McCarthy & Blanchard, 1993). The crystal structure determination of this compound was undertaken as part of our structural studies on laser dyes.…”

Section: Commentmentioning

confidence: 99%

A Second Triclinic Polymorph of Coumarin 153

Yip¹,

Moo²,

Lok³

et al. 1996

Acta Crystallogr C

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YVES DROMZEE et al. 477 was chosen on the basis of statistical tests and confirmed by subsequent results. In the /3 form, the observed systematic absences Okl, k = 2n + 1, hOl, l = 2n + 1, and hkO, h + k = 2n + 1, indicated space group Pbcn. Computations were performed using CRYSTALS (Watkin, Carruthers & Betteridge, 1988) adapted on a MicroVAXII. Scattering factors for all atoms were as incorporated in CRYSTALS. The structures were solved by direct methods. All remaining non-H atoms were found by successive electron-density map calculations. For the /3 (orthorhombic) form, the density map showed two prominent but unequal peaks, one on either side of the plane. The only satisfactory explanation of this was the assumption of a disordered model. Fractional oxygen, referred to as O(1) and O(2), was assigned to these two positions, with occupancy factors summing to unity and with the same isotropic displacement parameters. The refinement of occupancy led to 0.69 for O(1) and 0.31 for 0(2). Atomic coordinates were refined together with anisotropic displacement parameters [isotropic for 0(2)]. At this stage, the H atoms were located on a difference electron-density map, their coordinates refined with an overall isotropic displacement parameter and then included as fixed contributors for further structure-factor calculations. Least-squares refinements were carded out by minimizing the function ~w (lFol-lFcl) z. The models reached convergence with R and wR having the values listed. The criteria for a satisfactory complete analysis were the ratios of the r.m.s, shift to standard deviation being less than 0.1 and there being no significant features in the final difference maps.Lists of structure factors, anisotropic displacement parameters, Hatom coordinates and complete geometry have been deposited with the IUCr (Reference: PAl 162). Copies may be obtained through The Managing Editor, International Union of Crystallography, 5 Abbey Square, Chester CH 1 2HU, England. ReferencesChiarelli, R., Novak, M. A., Rassat, A. & Tholence, J. L. (1993). Nature, 363, 147-149. Chiarelli, R. & Rassat, A. (1991) . AbstractCoumarin 153, 2,3,6,7-tetrahydro-9-(trifluoromethyl)-1 H, 5H, 11 H-[ 1 ]benzopyrano [6,7,8-o]quinolizin-11-one, CI6H14F3NO2, was found to exist in a new polymorphic form in the triclinic system. There is an earlier report of a crystal structure determination of this compound, also in the triclinic system, but with a different cell volume and packing mode [Gridunova et al. (1992). Kristallografiya, 37,[366][367][368][369][370][371][372]. There are three molecules in the asymmetric unit of the title polymorph compared with two in the latter case; all three molecules show disorder in the piperidine ring system. The molecules are planar and are stacked parallel to the (011) plane. The crystal structure is stabilized by C--H---O hydrogen bonds. CommentThe title compound, (I), a dgidized aminocoumarin, has attracted extensive study since it has been used as a laser dye (Maeda, 1984; Pdyadarsini, Naik & Moorthy, 1989...

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Index of Organic Compounds for Dye Lasers V

Cited by 7 publications

References 0 publications

Influence of dye dispersion on photoelectric conversion properties of dye-containing titania electrodes

Influence of dye dispersion on photoelectric conversion properties of dye-containing titania electrodes

Coumarin 311

A Second Triclinic Polymorph of Coumarin 153

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