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High-efficiency circularly polarized emission from liquid-crystalline platinum complexes

Chinese Chemical Letters 2023年第6期34卷 310-314页

作者： Peng Fan Zhou Fang Shengyue Wang Qiwei Dong Chen Xiao Alice J.McEllin Duncan W.Bruce Weiguo Zhu Yafei Wang Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials Jiangsu Collaborative Innovation Center of Photovoltaic Science and EngineeringJiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and ApplicationsSchool of Materials Science&EngineeringChangzhou UniversityChangzhou 213164China Department of Chemistry University of YorkYork YO105DDUnited Kingdom Anhui Sholon New Material Technology Co. Ltd.Chuzhou 239500China

Realizing both a high emission efficiency and luminescence dissymmetry factor(g_(lum))in circularly polarized solution processable organic light-emitting diodes(CP-OLEDs)remains a significant *** this contribution,two chiral phosphorescent liquid crystals based on cyclometalated platinum complexes are prepared,in which the chiral s-2-methyl-1-butyl group is introduced into the cyclometalating ligand and the mesogenic fragment is attached to the periphery of the ancillary *** platinum complexes exhibit both smectic and chiral nematic phases as evidenced by polarized optical microscopy,differential scanning calorimetry and small-angle X-ray ***,a high photoluminescent quantum efficiency of over 78%and clear circularly polarized luminescent signal with g_(PL)of about 10^(-2)are observed for the ***,solution-processed CP-OLEDs show maximum external quantum efficiencies(EQE)of over 15%and strong circularly polarized electroluminescent signals with a g_(EL)≈10^(-2).This research demonstrates that both liquid crystallinity and the number of chiral centers play key roles in improving the chiroptical property,paving the way for a new approach for the design of high-efficiency CPL emitters.

关键词： Circularly polarized emission liquid-crystalline Platinum complex Organic light-emitting diodes

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Novel Biomaterial for NCT - “Rigid” Particles of (DNA-gadolinium) liquid-crystalline Dispersions

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Journal of Biomaterials and Nanobiotechnology 2011年第3期2卷 281-292页

作者： Yuri M. Yevdokimov Victor I. Salyanov Sergey V. Akulinichev Vladimir M. Skorkin Pavel V. Spirin Nataliya N. Orlova Vladimir I. Popenko Vladimir S. Prassolov 不详

The formation and physico-chemical properties of biomaterial, based on double-stranded (ds) DNA molecules and bearing high concentration of gadolinium, is described. This “rigid” biomaterial demonstrate a few unique properties: (i) the ds DNA molecules forming complexes with gadolinium are fixed in the spatial structure of “rigid” particles, (ii) an abnormal negative band in the circular dichroism spectrum permits to follow the formation of this biomaterial;(iii) local concentration gadolinium in the content of biomaterial can reach 40%. These properties show that we are dealing with a novel type of biomaterial strongly enriched by gadolinium. This opens a gateway for practical application of this biomaterial for neutron-capture reactions. A first attempt to apply this material for neutron-capture reaction in combination with neutron generator of thermal neutron flux was performed. Positive result obtained at destruction of CHO cells allows one to state that the advantages of this biomaterial are a simple manipulation with it, a possibility to adjust its gadolinium content, long-term stability of its physico-chemical properties, as well as a reduced cost of neutron-capture experiment.

关键词： liquid-crystalline DNA Dispersions Cholesterics Circular Dichroism Spectrum Gadolinium Neutron-Capture Therapy

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A Dual Effect of Au-Nanoparticles on Nucleic Acid Cholesteric liquid-crystalline Particles

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Journal of Biomaterials and Nanobiotechnology 2011年第4期2卷 461-471页

作者： Yuri M. Yevdokimov Sergey G. Skuridin Victor I. Salyanov Vladimir I. Popenko Victor M. Rudoy Ol,ga V. Dement′eva Eleonora V. Shtykova 不详

Au-nanoparticles (size about 2 nm, but not 5 or 15 nm) are capable of effectively incorporating into quasinematic layers of particles of cholesteric liquid-crystalline dispersion formed by double-stranded nucleic acid molecules of various families (DNA and poly(I)xpoly(C)). This Au-size-dependent process is accompanied by a decrease in amplitudes of abnormal bands in the CD spectra specific to initial cholesteric liquid-crystalline dispersions and simultaneously by an appearance of plasmon resonance band in visible absorption spectrum. The study of properties of particles of cholesteric liquid-crystalline dispersion treated with Au-nanoparticles by means of various physico-chemical methods demonstrates that incorporation of Au-nanoparticles into quasinematic layers of these particles results in two effects: i) it facilitates reorganization of the spatial cholesteric structure of particles, and ii) it induces the formation of Au-clusters in the content of particles. It is not excluded that these effects represent a possible reason for genotoxicity of Au-nanopar- ticles.

关键词： Double-Stranded Nucleic Acids Gold Nanoparticles Nucleic Acid liquid-crystalline Dispersions Circular Dichroism Structure of Lyotropic liquid Crystals of (Bio)Polymers Genotoxity of Nanoparticles

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Investigation of side chain liquid crystal polymers bearing cholesterol and bile acid derivatives

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合成化学 2004年第Z1期12卷 79-79页

作者： Stephen Freiberg Franεois Brisse C. Géraldine Bazuin Département de chimie Université de Montréal C. P. 6128 succursale Centre-ville Montreal (QC) CanadaH3C 3J7. Département de chimie Université de Montréal C. P. 6128 succursale Centre-ville Montreal (QC) CanadaH3C 3J7. Département de chimie Université de Montréal C. P. 6128 succursale Centre-ville Montreal (QC) CanadaH3C 3J7.

Cholic acid (or 3a,7a,12a-trihydoxyl-5a-cholan-24-oic acid) and lithocholic acid (or 3a-hydroxyl-5a-cholanic-24-oic acid) are commonly occurring bile acids synthesized from cholesterol in the liver in mammals. They all possess a steroid skeleton containing four rings, three with six carbons and one with five carbons. The transformation of cholesterol to cholic acid results in two major structural changes that affect the steroid skeleton. The first is the hydrogenation of the double bond between C5 and C6 and the second is a conformational flip of ring A from the 5a-position to the 5a-position. In addition, one or more hydroxyl groups are added to the steroid skeleton. Outside of the ring system, C24 is converted from a saturated alkyl to a carboxylic acid *** chain polymers based on cholesterol moiety have been made as reported in the *** bile acids and cholesterol are all in the family of steroid molecules, it is of interest to investigate whether bile acids may also act as mesogenic ***, flexible spacer groups with 10 carbons are introduced between bile acid skeleton and the poymerizable double bonds. The monomers and polymers are compared with cholesterol and dihydrocholesterol monomers and polymers with the same spacers. Dihydrocholesterol is chosen to investigate the influence of the double bond in the formation of LC, given that both cholesterol and dihydrocholesterol have a planar structure but there is no double bond in the latter. These monomers and their corresponding polymers were characterized for their liquid crystalline (LC) properties by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-ray *** was found that only the compounds bearing the planar cholesterol moieties possess LC phases. It is concluded that the 5a-configuration between the first and second cycles on the steroid skeleton of bile acids does not favor proper alignment of the rigid part of the bile acid moieties.

关键词： bile acids, liquid-crystalline polymers, X-ray

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