The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Irene M Mavridis - One of the best experts on this subject based on the ideXlab platform.
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Photochromism and thermochromism of Schiff bases in the solid state: Structural aspects
Chemical Society Reviews, 2004Co-Authors: Eugene Hadjoudis, Irene M MavridisAbstract:This tutorial review describes in a brief historical perspective the most important organic compounds that exhibit Photochromism in the crystalline state since its discovery in 1867 up to now and considers in detail Schiff bases of salicylaldehyde with amines (anils). The latter comprise a chemical system undergoing hydrogen-atom tautomerism between enol and keto forms and show the phenomena of solid state Photochromism and thermochromism. The system has been investigated extensively. Thus it has been shown that the photochromic property is a characteristic of the molecules but their chromobehaviour is influenced by the crystal structure of the compounds. Anils, apart from their fundamental interest, have potential for various applications.
Aleksei M. Zheltikov - One of the best experts on this subject based on the ideXlab platform.
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Quantum-controlled color: chirp- and polarization-sensitive two-photon Photochromism of spiropyrans in the solid phase
Chemical Physics Letters, 2003Co-Authors: Stanislav O. Konorov, D. A. Sidorov-biryukov, I. Bugar, Dusan Chorvat, Aleksei M. ZheltikovAbstract:Phase and polarization control over Photochromism in solid-state polymer materials doped with spiropyran compounds is demonstrated. Photochromism induced in spiropyrans by two-photon absorption of femtosecond pulses is shown to be sensitive to the initial chirp and polarization of these pulses. Enhancement of Photochromism achieved by means of chirp and polarization control allows the yield of colored-form spiropyran to be increased by more than an order of magnitude.
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Quantum Control of Two-Photon Photochromism in the Solid Phase
Journal of Experimental and Theoretical Physics Letters, 2003Co-Authors: Stanislav O. Konorov, D. A. Sidorov-biryukov, I. Bugar, Dusan Chorvat, D. Chorvatjr., Aleksei M. ZheltikovAbstract:Phase and polarization control of Photochromism in the solid phase is experimentally demonstrated. Photochromism initiated by a two-photon absorption of femtosecond laser pulses in a three-dimensional solid-phase polymer sample of spiropyran is controlled by varying the polarization state and the chirp of laser pulses.
Tao He - One of the best experts on this subject based on the ideXlab platform.
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photochromic materials based on tungsten oxide
Journal of Materials Chemistry, 2007Co-Authors: Tao HeAbstract:Tungsten oxide exhibits pronounced Photochromism upon bandgap photoexcitation, which makes it attractive and promising for applications in many areas. Some advances have been achieved during the past decades. The research on nanocrystalline films and single crystals indicates the critical importance of defects in tungsten oxide to its Photochromism. Based on energy-band engineering of semiconductors, enhancement of Photochromism has been achieved, for instance, extension of the photoresponse from UV to visible light by cathodic polarization, improved change in absorption before and after coloration through modification by a noble metal or another metal-oxide semiconductor, and increased photochromic reversibility via hybridization with organic amines. Nanocrystalline oxide films exhibit controllable wettability, which is coherent in nature with Photochromism.
Eugene Hadjoudis - One of the best experts on this subject based on the ideXlab platform.
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Photochromism and thermochromism of Schiff bases in the solid state: Structural aspects
Chemical Society Reviews, 2004Co-Authors: Eugene Hadjoudis, Irene M MavridisAbstract:This tutorial review describes in a brief historical perspective the most important organic compounds that exhibit Photochromism in the crystalline state since its discovery in 1867 up to now and considers in detail Schiff bases of salicylaldehyde with amines (anils). The latter comprise a chemical system undergoing hydrogen-atom tautomerism between enol and keto forms and show the phenomena of solid state Photochromism and thermochromism. The system has been investigated extensively. Thus it has been shown that the photochromic property is a characteristic of the molecules but their chromobehaviour is influenced by the crystal structure of the compounds. Anils, apart from their fundamental interest, have potential for various applications.
Janet L. Scott - One of the best experts on this subject based on the ideXlab platform.
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Novel Photochromism of propargylallene in the solid state
CrystEngComm, 2003Co-Authors: Koichi Tanaka, Akihiro Tomomori, Janet L. ScottAbstract:2-[2,7-Dibromo-9-(3-oxo-3-phenyl-prop-1-ynyl)-9H-fluoren-9-yl]-3-fluoren-9-ylidene-1-phenyl-propenone (1) shows Photochromism from pale yellow to green in the solid state, whereas 3-(2,7-dibromo-fluoren-9-ylidene)-2-[9-(3-oxo-3-phenyl-prop-1-ynyl)-9H-fluoren-9-yl]-1-phenyl-propenone (2) does not show any Photochromism.
