69720-87-2Relevant academic research and scientific papers
Preparation and property manipulation of high efficiency circularly polarized luminescent liquid crystal polypeptides
Chen, Youde,Lu, Peng,Yuan, Yongjie,Zhang, Hailiang
, p. 13632 - 13641 (2020)
Circularly polarized luminescent (CPL) materials show great potential applications in asymmetric synthesis, chemical sensors, biological probes, 3D displays and other fields. However, the preparation of high efficiency circularly polarized luminescent materials with a high solid fluorescence quantum yield and a large glum value is still a challenge. This article creatively combines the construction strategy of CPL materials and side-chain chiral liquid crystal polymer materials to engineer a series of new CPL-active side-chain chiral liquid crystal polymers (named PGAC-m, m is the spacer length, m = 4, 6, 10). The chiral poly(l-glutamate) with an α-helical secondary structure is devised as the backbone, and the cyanostilbene with aggregation-induced emission enhancement (AIEE) characteristics is applied as luminescent mesogen pendants, which is covalently linked to the backbone by different spacer lengths. The phase structure and the photophysical properties of PGAC-m were characterized in detail. The experimental results show that PGAC-m can self-assemble to form a lamellar-ordered chiral smectic C (SmC?) phase structure and show typical AIEE characteristics with high solid-state quantum yield. The chirality of polypeptides can be transferred to cyanostilbene, which makes PGAC-m emit circularly polarized light. Meanwhile, the chiral helix structure of PGAC-m can effectively enlarge the glum value, and therefore PGAC-m shows high solid quantum yield and a large glum value. Interestingly, the photophysical properties of PGAC-m can be regulated by changing the spacer length. The solid fluorescence quantum yield of PGAC-m decreases gradually with the increase of spacer length, while the glum value shows the opposite trend. The maximum solid fluorescence quantum yield and the glum value of PGAC-m can be 34.1% and 4.5 × 10-2, respectively. This journal is
Metal complexes of alpha amino dicarboxylic acids
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Page 5; 6, (2008/06/13)
Neutral alpha amino diacid complexes of trace minerals and their use for animal nutrition.
An infinite chiral single-helical structure formed in Cu(II)-L-/D-glutamic acid system
Mizutani, Mamoru,Maejima, Nanami,Jitsukawa, Koichiro,Masuda, Hideki,Einaga, Hisahiko
, p. 105 - 110 (2008/10/08)
Reaction of Cu(ClO4)2·6H2O with L-glutamic acid (L-glu) in 1:1 or 1:2 molar ratio at pH 5 gave only the complex [Cu(L-glu)-(H2O)]·H2O, whose crystal structure revealed that the copper atom was coordinated in square-planar geometry, with the amino nitrogen and the carboxylate oxygen of L-glu, the side-chain carboxylate oxygen of a neighboring L-glu, and the oxygen of a water molecule in the equatorial positions. Weak coordination of two additional glutamate oxygens to both axial positions complete a distorted octahedron. The [Cu(L-glu) (H2O)] units linked by coordination of the side-chain carboxylate group form an infinite left-handed single helix; the use of D-glu in place of L-glu gives a right-handed helix, indicating that the glu enantiomerism determines the helicity. Thermogravimetric and differential thermal analyses of the complex showed reversible desorption of just two water molecules at 95-130°C, whose behavior was examined by ESR and circular dichroism spectral and powder X-ray diffraction methods in solid state. The crystals obtained from the reaction of Cu(II) ion with DL-glu showed spontaneous resolution.
