- A non-planar organic molecule with non-volatile electrical bistability for nano-scale data storage
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A new non-planar organic molecule with electron donor and acceptor capabilities was synthesized for nano-scale data storage. Macroscopic I-V characteristics of organic crystalline thin films indicate that the non-planar molecule possesses good electrical
- Hu, Junping,Li, Yingfeng,Ji, Zhuoyu,Jiang, Guiyuan,Yang, Lianming,Hu, Wenping,Gao, Hongjun,Jiang, Lei,Wen, Yongqiang,Song, Yanlin,Zhu, Daoben
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- Photoresponding ionic complex containing azobenzene chromophore for use in birefringent film
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A novel photoresponding ionic complex (PANDAZO) was prepared by the ionic self-assembly (ISA) of sodium polyacrylate (PANa) and azobenzene chromophores (NDAZO). The ionic complex forms an interdigitated lamellar structure with full overlap of the side chains. The optical anisotropy was investigated by using a polarization pulse laser (355 nm). Furthermore, a high photoinduced birefringence (Δn = 0.365) was measured by using a continuous 488 nm laser as the pump light.
- Wu, Jun,Lu, Xue-Min,Shan, Feng,Guan, Jun-Fang,Lu, Qing-Hua
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- Photoisomerization and Mesophase Formation in Azo-Ionic Liquids
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Ionic liquids present a versatile, highly tunable class of soft functional materials. Aside from being low melting salts, they can be endowed with additional functionalities. In N-alkylimidazolium halides, which are a prominent class of ionic liquids (ILs), the imidazolium cation was linked via an ether-bridge to an azobenzene unit in order to obtain photoresponsive materials through photoinduced trans-cis isomerization. The azobenzene unit, in turn, was modified with electron-donating or -withdrawing groups such as methyl-, tert-butyl-, methoxy-, N,N-dimethylamino, and nitro groups to study their influence on the photoisomerization and phase behavior. Endowing the imidazolium additionally with a long alkyl chain allows the materials to potentially form liquid crystalline (LC) mesophases before melting into the isotropic liquid. All studied compounds qualify as ionic liquids, and all, except for the nitro-compound, show the formation of smectic mesophases melting to the isotropic liquid. The compounds with the bulkiest aliphatic substituent, the tert-butyl, shows the lowest melting point, the largest mesophase window, and an efficient photochemical trans-cis conversion (>90%). In summary, by tuning sterically and electronically the cationic part of ILs, a photoswitchable room temperature liquid crystal could be developed and design guidelines for photoresponsive ionic liquids could be obtained.
- Renier, Olivier,Bousrez, Guillaume,Stappert, Kathrin,Wilk-Kozubek, Magdalena,Adranno, Brando,Pei, Hanwen,Spielberg, Eike T.,Smetana, Volodymyr,Mudring, Anja-Verena
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p. 214 - 225
(2019/12/24)
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- Fluorescent nanoparticles assembled from a poly(ionic liquid) for selective sensing of copper ions
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Fluorescent nanoparticles were formed from a poly(ionic liquid) through ion interactions. The fluorescent nanoparticles show highly fluorescent intensity and stability to UV light irradiation and were utilized for highly sensitive and selectivity fluoresc
- Cui, Kun,Lu, Xuemin,Cui, Wei,Wu, Jun,Chen, Xumeng,Lu, Qinghua
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supporting information; experimental part
p. 920 - 922
(2011/02/25)
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