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A detailed numerical study of soliton switching in a nonlinear directional coupler with saturating nonlinearity is carried out. All commonly used models have been studied. Relevant physical characteristics for switching have been determined, compared and discussed. 相似文献
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Siemeling U Scheppelmann I Heinze J Neumann B Stammler A Stammler HG 《Chemistry (Weinheim an der Bergstrasse, Germany)》2004,10(22):5661-5670
2,5-Diphenyl-3,4-bis(2-pyridyl)cyclopenta-2,4-dien-1-one (1), a close relative of tetraphenylcyclopentadienone, is a new ligand platform for use in redox switches and sensors. Compound 1 acts as a molecular electrochemical sensor towards a range of divalent metal ions and exhibits favourable two-wave behaviour. It forms chelates of the type [(1)MX2], whose stability is enhanced by five orders of magnitude upon one-electron reduction. The bite angle of 1 is close to 90 degrees in these complexes. The attachment of the 14-valence-electron Cp*Co fragment to the cyclopentadienone pi system reduces the bite angle and thus modulates the binding characteristics of 1. 相似文献
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介绍了二甲基二氢芘类化合物特殊的逆光致变色性质,讨论了内外取代基、间隔基以及稠合基团等因素对二甲基二氢芘光致变色性质的影响,综述了该类化合物在光学开关和信息的光化学读出等应用方面的研究状况,并展望了二氢芘类光致变色化合物的研究前景。 相似文献
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An Optically and Thermally Switchable Electronic Structure Based on an Anthracene–BODIPY Conjugate
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Tatsuya Aotake Dr. Mitsuharu Suzuki Kazuaki Tahara Dr. Daiki Kuzuhara Prof. Dr. Naoki Aratani Prof. Dr. Naoto Tamai Prof. Dr. Hiroko Yamada 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(13):4966-4974
An optically and thermally responsive boron dipyrromethene (BODIPY) dye, namely, meso‐2‐(9,10‐dihydro‐9,10‐ethanoanthracene‐11,12‐dione) (DK)‐linked, bicyclo[2.2.2]octadiene (BCOD)‐fused BODIPY ( BCOD‐DK ), was synthesized. The weakly luminous structure of BCOD‐DK can be changed quantitatively to that of the strongly fluorescent BODIPY BCOD‐Ant by optical excitation at the DK unit, which induces double decarbonylation of the DK unit to give an anthracene unit. The solvent effect on the fluorescence properties of BCOD‐DK suggests that the dramatic change in fluorescence intensity is controlled by intramolecular electron transfer from the BODIPY moiety to the meso‐DK substituent. BCOD‐DK is converted to meso‐ DK benzene‐fused BODIPY ( Benzo‐DK ) by heating at 220 °C with 64–70 nm redshift of absorption and fluorescence peaks without changing the fluorescence quantum yield of ΦF=0.08 in dichloromethane. Benzo‐DK can be converted to strongly fluorescent meso ‐ anthracene benzene‐fused BODIPY Benzo‐Ant by optical excitation. Thus, BCOD‐DK can show four different optical performances simply by irradiation and heating, and hence may be applicable for optical data storage and security data encryption. 相似文献