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Synthesis of new complex salt crystal K[InCl]
CHEN Lin, CHEN Lin, WU Bolin, HE Xiaoyi
Front. Chem. China. 2008, 3 (2): 125-127.
https://doi.org/10.1007/s11458-008-0023-2
During the experiment of preparing ITO (Indium Tin Oxide) nanopowder, a new complex salt crystal K3[InCl6] was found and synthesized using a solution growth method. The diffraction pattern, morphology, element composition and structure of the crystal were analyzed by XRD, SEM and CCD. The results implied that K3[InCl6] is monoclinic, is of the space group P21/c, has a chemical formula of K3[InCl6], a Z = 4 and with the following cell parameters: a = 12.188 Å, b = 7.553 Å, c = 12.703 Å, ? = 90.00°, ? = 108.96°, ? = 90.00°, V = 1105.98 Å3.
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Preparation, structure and properties of PP--AA grafting copolymer
CAI Chuanlun, SHI Qiang, LI Lili, YIN Ligang, TANG Gongben, YIN Jinghua
Front. Chem. China. 2008, 3 (2): 133-137.
https://doi.org/10.1007/s11458-008-0025-0
Polypropylene grafting with AA was prepared by reactive extrusion with pre-irradiated PP (rPP) as the homogeneous initiator. The effects of the pre-irradiated dose, the fraction of rPP and the concentration of acrylic acid on the grafting reaction were studied and the grafted PP was characterized by Fourier transition infrared spectroscopy (FTIR), differential scanning calorimeter (DSC) and polarized light microscopy (PLM). The results show that the degradation of PP was suppressed efficiently with this novel method for preparing PP-g-AA copolymers, and the grafted copolymers with good mechanical properties were obtained. It was found that the product with higher graft degree (Gd)(0.19%) and relatively excellent mechanical properties can be produced if the mass ratio of PP/rPP/AA is 90:10:0.8, where the selected pre-irradiation dose of rPP is 4 kGy. Moreover, an adhesive strength of 4.88 kN/m was reached in the PP-g-AA/aluminum laminate.
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Nuclease activity of copper(II) complex containing
1,10-phenanthroline-5,6-dione and L-phenylalanine ligands
XU Guangjun, GU Wen, MA Xiaofang, FENG Li, YAN Shiping, LIAO Daizheng, CHENG Peng, XU Guangjun, FENG Li
Front. Chem. China. 2008, 3 (2): 138-142.
https://doi.org/10.1007/s11458-008-0026-z
The interaction between CT-DNA and a ternary copper (II) complex, [Cu(phendio)(L-Phe)(H2O)](ClO4)·H2O (CuPP, phendio = 1,10-phenanthroline-5,6-dione, L-Phe = L-phenylalanine), has been conducted by electronic spectra, fluorescence spectroscopy and cyclic voltammetry. It has been found that the max. absorption peak from the electronic spectra is red shifted and the intensity is weakened and that the values of peak current from cyclic voltammetry are decreased significantly in the presence of DNA compared with that in the absence of DNA. At the same time, the complex can quench the emission intensity of EB-DNA system. The existence of the intercalation mode between the complex and DNA was proven. By submarine gel electrophoresis, we found that the copper(II) complex can cleave circular plasmid pBR322 DNA into nicked and linear forms in the presence of ascorbic acid and H2O2.
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Preparation and catalytic performance of monolayer-dispersed
Pd/Ni bimetallic catalysts for hydrogenation
WANG Songrui, LIN Wei, ZHU Yuexiang, XIE Youchang, CHEN Jingguang G
Front. Chem. China. 2008, 3 (2): 161-165.
https://doi.org/10.1007/s11458-008-0031-2
Pd/Ni bimetallic catalysts were prepared by replacement reactions, characterized by X-ray diffraction, CO chemisorption and H2 temperature-programmed desorption, and evaluated for hydrogenation of cyclohexene, styrene and acetone. The results show that Pd atoms are monolayer-dispersed on the Ni surface in these Pd/Ni catalysts. Consequently, Pd/Ni catalysts are much more active than Pd/Ni and Pd/?-Al2O3 with the same Pd loading prepared by the conventional impregnation method.
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Synthesis of hydrophobic association cationic
starch and its flocculation application on containing algae water
of Dianchi Lake
XU Xiaojun, LIU Xiangyi, YANG Yuming
Front. Chem. China. 2008, 3 (2): 166-171.
https://doi.org/10.1007/s11458-008-0032-1
The hydrophobic formation cationic starch (PSOAMDA) was prepared from starch (St), octadecyl acrylate (OA), acrylamide (AM) and dimethyl diallyl ammonium chloride (DMDAAC) by means of inverse suspension polymerization with redox initiator. Water with algae from Dianchi Lake was tested with PSOAMDA. Results show that when the molar ratio of St: AM: DMDAAC: OA is 4:8:1.5:0.6 and the reaction temperature is 40°C with a reaction time of 3 h, the monomer conversion yield, graft percentage and cationic degree is 92.4%, 63.8% and 7.3%, respectively, and M? = 3.26 × 106 g/vmol. It had been found from the flocculation of disposed water with algae from Dianchi Lake that the transparency and COD elimination reach to 93.5% and 70.3%, respectively, with 15 mg/L PSOAMDA and at pH 6, vs. 91.3% and 69.2% obtained with the commercial cationic polyacrylamide (PAM-C). When PSOAMDA dosage is 10–25 mg/L and the pH of aqueous solution is 6–10, the flocculation performance is well capable of dealing with the water with algae from Dianchi Lake.
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Preparation and properties of polyvinyl acetal
sponge modified by chitosan
LIN Zhidan, ZHANG Xiuju, ZENG Rong
Front. Chem. China. 2008, 3 (2): 172-177.
https://doi.org/10.1007/s11458-008-0033-0
The polyvinyl acetal sponge modified by chitosan was prepared by adding chitosan/polyvinyl alcohol (PVA) solution during the acetalation reaction of PVA and formaldehyde. The effect of vesicant and chitosan to the pore morphology, water absorption ratio, water absorption rate, expansion time and mechanical properties were studied. The polyvinyl acetal sponge modified by chitosan was used as a hemostatic packing material for the injured rabbit nasal tissue. The hemostatic effect and the healing effect of the modified sponge on the nasal mucosa after nasal surgery were studied. The results indicated that the polyvinyl acetal sponge modified by chitosan has an interconnected pore structure and the wall between large pores also has small pores. The chitosan adhered on the inner surface of the pores. The increased content of vesicant led to an increase in pore diameter, in the water absorption ratio and in expansion time. However, there was only a small change in the water absorption rate and a decrease in tensile strength and compression strength were noted. With an increase in chitosan content, the pore diameter and interconnection of the sponge was reduced. Water absorption ratio, expansion time and water absorption rate decreased, but tensile strength and compression strength improved. Observation of the rabbit nasal tissue after surgical operation suggested that polyvinyl acetal sponge modified by chitosan has an anti-inflammatory, hemostatic and anti-adherent characteristic and could promote the healing and functional recovery of rabbit nasal mucosa.
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Study on spectroscopy of two flavonyl glycosides
from
REN Xiuhua, DU Guang, ZONG Kai, MA Baoxia, ZHOU Bingfeng
Front. Chem. China. 2008, 3 (2): 178-181.
https://doi.org/10.1007/s11458-008-0034-z
To study the bioactive constituents from Andrographis paniculata, two compounds were isolated and purified by column chromatography on AB-8 macroporous adsorption resin and polyamide. Their structures were determined by various spectroscopic methods, including UV, FABMS, 1H-NMR, 13C-NMR, DQFCOSY, TOCSY, HMQC, HMBC, and NOESY. The 1H-NMR and 13C-NMR signals of the two compounds were assigned. The structures of the two compounds were elucidated as 5,4′-dihydroxy-7-methoxyflavone-6-yl-?-D-glucopyranoside and 5,4′-dihydroxy-7-methoxyflavone- 8-yl-?-D-glucopyranoside, respectively.
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Synthesis of AB star-shaped
miktoarm copolymers and their crystallization behavior
WANG Kangcheng, HUANG Wei, ZHOU Yongfeng, YAN Deyue
Front. Chem. China. 2008, 3 (2): 186-192.
https://doi.org/10.1007/s11458-008-0036-x
A small molecule (GMS-SA2) with one alkyl chain and two terminal carboxyl groups was synthesized successfully by the reaction of glyceryl monostearate (GMS) with excess succinic anhydride (SA). Then, GMS-SA2 was used as a coupling agent to condensate with polyethylene glycols (PEG) of different molecular weight or polyethylene glycol monomethyl ether (PEGm) in the presence of stannous octoate as catalyst and diphenyl ether as azeotropic agent. The AB2 star-shaped miktoarm copolymers were obtained successfully and were characterized by 1H-NMR, DSC, GPC, XRD, FTIR and polarizing microscopy. The results of DSC and XRD measurements indicate that the crystallization temperature and the melting temperature of the AB2 star-shaped miktoarm copolymers are different from those of the corresponding linear PEGs, because the existing of GMS-SA2 alters their crystalline growth velocity and the perfect degree of crystals. It is very important to control the crystal morphology of star-shaped copolymers by introducing the miktoarm into the star-shaped polymers and adjusting its content in star-shaped polymers.
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Separation, purification and structure elucidation
of a polysaccharide from root of
FANG Jinian, DING Kan, DONG Qun, SHI Lei, CHEN Kaoshan
Front. Chem. China. 2008, 3 (2): 209-212.
https://doi.org/10.1007/s11458-008-0040-1
A water-soluble polysaccharide (CPS-0) was obtained from the root of Cudrania tricuspidata (Carr.) Bur., by hot water extraction (70°C), deproteination using enzymolysis and Sevag method, precipitation with ethanol, and fractionation through DEAE-Sephadex A-50 chromatography. The purity of CPS-0 was determined by HPLC and the structure was elucidated by monosaccharide composition analysis, methylation analysis, GC, GC-MS, NMR spectral (1H-NMR, 13C-NMR, HMQC), UV, IR, and elemental analysis. The CPS-0 was found to contain glucose residues only. The average repeating unit is a decasaccharide having a backbone consisting of 1,4-linked ?-D-glucopyranosyl residues to which the side chain consisting of terminal and 1,4-linked ?-D-glucopyranosyl residues was attached at position 6 of the branching residues.
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