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Fuqiang Huang - One of the best experts on this subject based on the ideXlab platform.
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sr5ga8o3s14 a nonlinear optical oxysulfide with melilite derived structure and wide band gap
Inorganic Chemistry, 2020Co-Authors: Ruiqi Wang, Yangwu Guo, Xian Zhang, Yi Xiao, Jiyong Yao, Fuqiang HuangAbstract:Sr5Ga8O3S14, which is a novel nonlinear optical oxysulfide, was discovered via solid-state reaction. The compound crystallizes in noncentrosymmetric space group P21212 (No. 18) of the orthorhombic ...
Norberto Farfan - One of the best experts on this subject based on the ideXlab platform.
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Second-Harmonic Generation within the P212121 Space Group, in a Series of Chiral (Salicylaldiminato)tin Schiff Base Complexes
Chemistry of Materials, 2006Co-Authors: José Maria Rivera, Horacio Reyes, Armando Cortés, Rosa Santillan, Pascal G. Lacroix, Christine Lepetit, Keitaro Nakatani, Norberto FarfanAbstract:A series of 10 (2-11) new chiral (salicylaldiminato)tin Schiff base complexes obtained from the Schiff base condensation of 4-(diethylamino)salicylaldehyde and various amino acids, in the presence of diphenyltin oxide, is reported together with the parent achiral (1) derivative. Compounds 2-7 crystallize in the P212121 orthorhombic space group, and their quadratic nonlinear optical properties are investigated. At the molecular level, the derivatives possess similar electronic spectra (ìmax 395 nm), and hence molecular hyperpolarizabilities (â), in relation to the same ð-conjugated “push-pull” electronic structure. In the solid state, they exhibit efficiencies in second-harmonic generation (SHG) up to 8 times that of urea. The SHG intensities of chromophores 2-6 appear largely correlated with a simple “degree of chirality” (dø) parameter, defined from the molecular geometries. The intriguing issue of a possible quantification of chirality by means of SHG measurement is addressed.
Yoshiyuki Sakano - One of the best experts on this subject based on the ideXlab platform.
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crystallization and preliminary x ray analysis of thermoactinomyces vulgaris r 47 maltooligosaccharide metabolizing enzyme homologous to glucoamylase
Acta Crystallographica Section F-structural Biology and Crystallization Communications, 2005Co-Authors: Kazuhiro Ichikawa, Takashi Tonozuka, Shigehiro Kamitori, Atsushi Nishikawa, Masahiro Mizuno, Yoshihiro Tanabe, Yoshiyuki SakanoAbstract:A maltooligosaccharide-metabolizing enzyme from Thermoactinomyces vulgaris R-47 (TGA) homologous to glucoamylase degrades maltooligosaccharides more efficiently than starch, unlike fungal glucoamylases. TGA was crystallized and the state of the protein in solution was analyzed by gel-filtration chromatography. Diffraction data were collected to 3.31 A resolution. The TGA crystal belongs to the orthorhombic space group P212121 or P21212, with unit-cell parameters a = 110.2, b = 317.6, c = 144.9 A, and is expected to contain five to eight TGA molecules per asymmetric unit. Gel-filtration and native PAGE analyses indicated that TGA exists as a dimer in solution. This is the first report of the crystallization of an oligomeric glucoamylase.
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crystallization and preliminary x ray analysis of thermoactinomyces vulgaris r 47 maltooligosaccharide metabolizing enzyme homologous to glucoamylase
Acta Crystallographica Section F-structural Biology and Crystallization Communications, 2005Co-Authors: Kazuhiro Ichikawa, Takashi Tonozuka, Shigehiro Kamitori, Atsushi Nishikawa, Masahiro Mizuno, Yoshihiro Tanabe, Yoshiyuki SakanoAbstract:A maltooligosaccharide-metabolizing enzyme from Thermoactinomyces vulgaris R-47 (TGA) homologous to glucoamylase degrades maltooligosaccharides more efficiently than starch, unlike fungal glucoamylases. TGA was crystallized and the state of the protein in solution was analyzed by gel-filtration chromatography. Diffraction data were collected to 3.31 A resolution. The TGA crystal belongs to the orthorhombic space group P212121 or P21212, with unit-cell parameters a = 110.2, b = 317.6, c = 144.9 A, and is expected to contain five to eight TGA molecules per asymmetric unit. Gel-filtration and native PAGE analyses indicated that TGA exists as a dimer in solution. This is the first report of the crystallization of an oligomeric glucoamylase.
Suzanne E Sherman - One of the best experts on this subject based on the ideXlab platform.
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synthesis and characterization of magnesium and zinc complexes of 1 4 7 triazacyclononane n acetate potential models for the active site of rubisco
Inorganica Chimica Acta, 2000Co-Authors: Duncan T Odom, Christine J Gramer, Victor G Young, Scott A Hilderbrand, Suzanne E ShermanAbstract:Abstract Reaction of the tetradentate pendant-arm macrocycle 1,4,7-triazacyclononane-N-acetate (L) with Zn(O3SCF3)2 or Mg(O3SCF3)2 in alcohol produces the six-coordinate complexes [ZnL(H2O)]O3SCF3·C2H5OH (1) and [MgL(H2O)2]O3SCF3 (2). Compounds 1 and 2 were characterized by single-crystal X-ray crystallography. The complex cation of 1 forms a polymeric chain with zinc centers bridged in a syn, anti fashion by acetate pendant arms. The complex cation of 2 is mononuclear, with two adjacent coordination sites on magnesium occupied by water molecules. These labile coordination sites may provide a binding site for activation of substrates in functional modeling of magnesium enzymes such as RuBisCo. 1H and 13C NMR spectroscopy demonstrates that L remains bound to magnesium in methanol solution. Crystal data: 1, orthorhombic, space group P212121, a=9.0536(7), b=14.3750(11), c=14.4741(11) A, V=1883.7(2) A3, Z=4, R=0.041; 2, orthorhombic, space group P212121, a=8.5949(3), b=13.9694(4), c=14.0076(5) A, V=1681.83(10) A3, Z=4, R=0.0248.
Rengen Xiong - One of the best experts on this subject based on the ideXlab platform.
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synthesis and structures of two novel non centrosymmetric metal organic polymers containing 2 pyridin 4 yl 1h imidazole 4 5 dicarboxylic acid ligands
Journal of Molecular Structure, 2010Co-Authors: Lizhuang Chen, Yao Huang, Rengen XiongAbstract:Abstract Two novel non-centrosymmetric coordination polymer, [Zn2(PIDC)(H2O)Cl]n (1) and {[Mn(HPIDC)H2O]·2H2O}n (2) have been synthesized through hydrothermal method and characterized by IR, elemental analysis and single-crystal X-ray diffraction. Complex 1 crystallized in a chiral space group P212121 has a 2D network structure. Complex 2 is a 3D open framework with 1D channel where 1D zigzag water chains are reside through hydrogen-bonding interactions and crystallized in a chiral space group Cc. Both 1 and 2 display a strong second harmonic generation (SHG) response.
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a secondary reagent assisted synthesis of a novel niii moiv chiral coordination polymer
Crystal Growth & Design, 2009Co-Authors: Wen Zhang, Zhiqiang Wang, Osamu Sato, Rengen XiongAbstract:With the aid of a secondary reagent [CuII(tren)](ClO4)2, a novel chiral one-dimensional coordination polymer, [NiII(tren)]3[MoIV(CN)8](ClO4)2·5H2O (1) (tren = tris(2-aminoethyl)amine), was inadvertently but reproducibly synthesized, which crystallizes in a chiral space group P212121 and shows a complex triple-stranded helical structure.
