Advanced Materials Research Vols. 554-556

Abstract: A new Eu complex [Eu (C₃O₉H₆)] ·2(H₂O) has been synthesized from a hydrothermal reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. The Eu atom is coordinated by eight O atoms. The molecular is antisymmetric structure by the C3-C3 axis. It is striking that the structure of the complex exhibits extensive O-H…O hydrogen-bonding interactions.

Abstract: Solid-state photocycloaddition reactions between tri-2-pyrones (1a,1b) with benzophenone (2) gave the corresponding oxetane derivatives (3a:3a′=1:1 and 3b:3b′=1:1, 1:2 adducts) with high site- and regioselectivity across the C5-C6 , C5′-C6′ and C5′′-C6′′ double bonds in 1 via the triplet excited state of 2. The site- and regioselectivities were explained by MO calculations. The hydrogen-bonding interaction between 2 and 1a, 1b and the triplet reaction mechanism were also explained by the IR analyses and the quenching experiments, respectively.

Abstract: In this article, we synthesized some hydrogen-containing polysiloxanes by ring-openging polymerization of cyclosiloxanes and studied their viscosity-average molecular weights (η) and active hydrogen content respectively. Then we prepared a chiral amide compound by condensation reaction of acryloyl chloride and (1S)-1-phenylethanamine. Subsequently, we successfully carried out hydrosilylation reaction with the chiral amide and one of hydrogen-containing polysiloxane. In addition, the structures of the target molecules have been confirmed by IR and 1H NMR spectra, elemental analysis and polarimetric analysis.

Abstract: The synthesis of new side chain cholesteric liquid crystalline elastomers (ChLCEs) containing the cholesteric monomer M and the flexible non-mesogenic crosslinking agent C, is described. The selective reflection of light for M was characterized with UV/Visible/NIR. The phase behavior and mesomorphism were investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and X-ray diffraction (XRD). The effect of the content of crosslinking units on the phase behavior and mesomorphism of elastomers P₁ – P₈ is discussed. The ChLCEs exhibit elasticity, reversible phase transitions, and cholesteric Grandjean texture. The experimental results demonstrate that the glass transition temperature and isotropic temperature of ChLCEs decrease with increasing the content of crosslinking unit, but the cholesteric phase is not disturbed.

Abstract: The reaction of platinum(II) complexes of [Pt(bpy-R)Cl₂] (R = H; 2,2’-bipyridine(bpy), R = 2(CH)₃; 4,4’-dimethyl-2,2’-biypridine (DM-bpy), R = 4(CH3); 3,3’-5,5’-tertamethyl-2,2’-bipyridiyl (TM-bpy), (1-3) or [Pt(1,10-phen-R’)Cl2] (R’ = H; 1,10-phenanthroline(1,10-phen), R’= 4(CH3); 3,4,7,8-tetramethyl-1,10-phenanthroline(3,4,7,8-tetramethyl-1,10-phen) (4-5) with 1,4-bis(5'-2',2"-bipyridine)benzene(bpy-Ph-bpy) affords the following monomeric platinium(II) complexes: [Pt(bpy)(bpy-Ph-bpy)]²⁺(1), [Pt(DM-bpy)(bpy-Ph-bpy)](2), and [Pt(TM-bpy)(bpy-ph-bpy)]²⁺(3), [Pt(1,10-phenanthroline)(bpy-ph-bpy)]²⁺2+(4), [Pt(3,4,7,8²⁺-tetramethyl-1,10-phen)(bpy-ph-bpy)]²⁺ (5), respectively. These complexes were characterized by NMR, IR, UV/VIS and PL spectroscopy of the complexes were elucidated. The internal quantum yields of these platinum complexes are very high (0.13 ~ 0.99) and they emit light in the blue region (360 ~ 417 nm).

Abstract: A triphenylene-based discotic compound 2,3,6,7,10,11-hexaheptylcar-boxyltriphenylene was synthesized. The structure of the compound was determined by ¹HNMR and FT-IR spectrum and its mesomorphism was clarified by DSC and POM methods. The carrier mobility was measured using time-of-flight method and has a value of 1.2 × 10^-1cm²V^-1s^-1.

Abstract: The PBA-containing hydrogels were produced by copolymerizing 3-acrylaminophenylboronic acid with acrylamide. Hydrogels swelling increases steadily with pH and glucose concentration. The boronate specific dye, Alizarin Red S(ARS) was incorporated into hydrogels film. Alizarin Red S displays a dramatic change in fluorescence intensity and color in response to binding to boronic acid. The sensitivity of hydrogels is improved significantly.

Abstract: A capillary electrophoresis (CE) method for the separation of four kinds of enantiomers of non-natural carboxylic amino acid was built while hydroxypropyl-β- cyclodextrin (HP-β-CD) derivations as chiral selective material. Several different β-CD derivatives were tested for the chiral separation of non-natural carboxylic amino acid, and it was proved that HP-β-CD could show better chiral selectivity. The separation of enantiomers of amino acid was obtained by CE in a 50-μm i.d.×60 cm (effective length 45 cm) fused-silica capillary at 18 kV voltage, while 10 mM phosphate acted as running buffer and HP-β-CD served as selective material. The detective wavelength was set at 254 nm.

Abstract: Objective To optimize the preparation technology of salicylic acid liposome gel. Method Salicylic acid liposome was prepared with reverse evaporating method, and liposome gel was prepared using carbomer-940 as matrix. The encapsulation efficiency and leaking percentage of salicylic acid liposome was determined with centrifugal method, and the preparation technology of liposome gel was optimized with orthogonal test. Results The encapsulation efficiency of salicylic acid liposome was 75.86％, leaking percentage was 1.37％. The optimal preparation technology of liposome gel were carbomer 3g, glycerol 15g, mixing temperature 40°C, mixing time 15min. Conclusion Reverse evaporating method was a good method to prepare salicylic acid liposome with higher encapsulation efficiency and better stability. The optimized preparation process of liposome gel was desirable, and the characteristics of product was stable and uniform.

Abstract: Compounds (S1-S3) containing triphenylamine donors, bipyridine acceptors and olefinic linkers were synthesized and characterized. Three compounds have excellent solubility in common solvents and tend to form solid films. The peaks of emission of S1-S3 are in the range of 476nm-504nm on solid films, corresponding to blue light emission. S1-S3 have fluorescence lifetime exceeding 2.05ns and absolute fluorescence quantum yield above 22% in dilute chloroform solutions. Three compounds possess glass-transition temperatures superior to 63°C. The HOMO levels are in the range of -5.17eV - -5.13eV to facilitate hole injection. The properties of S1-S3 indicate that these compounds are promising candidates as hole-transporting materials or blue light-emitting materials in organic light-emitting devices.