2351-37-3Relevant articles and documents
Effect of the thermal history on the thermal and rheological behavior of a thermotropig polyester
Ressia, Jorge A.,Quinzani, Lidia M.,Valles, Enrique M.,Bello, Pablo,Bello, Antonio
, p. 9 - 33 (2004)
The biphasic behavior and phase transitions of a thermotropic mainchain liquid crystalline polyester, the poly(oxytrimetilen-etilen glycol p,p'bibenzoate), was studied by X-ray diffractometry, differential scanning calorimetry (DSC), and rotational rheometry. The liquid crystalline mesophase structure of the polymer evolves from Smectic C to Smectic A at around 100°C and changes to the isotropic state at about 200°C. The annealing of polymer samples at different temperatures within the smectic-isotropic transition gives rise to double endotherm and exotherm peaks on the heating and cooling DSC traces. These peaks are attributed to the preferential segregation of the lower molecular weight molecules from the liquid crystalline to the isotropic phase in the biphasic zone. The Theological studies are consistent with this result. The dynamic moduli measured at constant frequency in temperature ramps using polymer samples with, different thermal histories reveal that the type of annealing processes applied in the biphasic none generates different evolution of the rheological data.
New Fluorescent Bichromophoric Probes for the Donor-Donor Energy Migration (DDEM) Studies
Johansson,Kalinin,Filatova,Molotkovsky
, p. 80 - 84 (2003)
Three fluorescent probes were synthesized for studying the excitation energy migration between two identical fluorophores. Each probe has two identical fluorescent groups (dansyl, 7-nitrobenzo-2-oxa-1,3-diazole-4-yl, or fluoresceinyl) linked by the rigid bis-(8-aminooctyl)amide of 4,4′-biphenyldicarbonic acid or flexible dotriacontanedioic acid spacer, which enables the intramolecular energy migration through the distance of 3.2-3.5 nm.
A kind of benzene ring - aromatic ring series compound, its preparation method and medical use
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Paragraph 0145-0148, (2017/12/05)
The invention relates to a phenyl ring-aromatic ring cascaded micro-molecular organic compound which can be used as a protein-tyrosine-phosphatase subtype inhibitor and is shown in a general formula I as described in the specification. The compound can be used as a tool compound for research on the biological functions of a variety of subtypes of a protein-tyrosine-phosphatase family in cell signal transduction, so novel means is provided for prevention and treatment of cancers, metabolism and immunological diseases, cardiovascular diseases and nervous diseases. The invention also relates to a preparation method and medicinal application of the compound.
Homochiral Metal-Organic Frameworks with Tunable Nanoscale Channel Array and Their Enantioseparation Performance against Chiral Diols
Zhuo, Chao,Wen, Yuehong,Hu, Shengmin,Sheng, Tianlu,Fu, Ruibiao,Xue, Zhenzhen,Zhang, Hao,Li, Haoran,Yuan, Jigang,Chen, Xi,Wu, Xintao
supporting information, p. 6275 - 6280 (2017/06/13)
Enantioseparation is an integral process in the pharmaceutical industry, considering the ever-increasing demand for chiral medicine products. As a new material, porous metal-organic frameworks (MOFs) have shown their potential application in this field because their structures are easy to adjust and control. Though chiral recognition between racemic substrates and frameworks has made preliminary progress, discussions of their size-matching effects are rare. Herein with the help of channel-tunable homochiral MOFs (HMOFs), diols of different sizes have been separated in good enantiomeric excess (ee%). In addition, the ee% reaches 67.4% for the first time for diols as large as 1,1,2-triphenyl-1,2-ethanediol, which turns out to be the most effective value so far.
