An interesting T4（2）5（2） water tape formed by fused cyclic water pentamers and tetramer was self-assembled in a new inorganic host [Ni（L）（phen）2]·5H2O （L = L-cysteic acid） and characterized by X-ray dif...An interesting T4（2）5（2） water tape formed by fused cyclic water pentamers and tetramer was self-assembled in a new inorganic host [Ni（L）（phen）2]·5H2O （L = L-cysteic acid） and characterized by X-ray diffraction. Each [Ni（L）（phen）2] molecule crystallizes with five water molecules with a molecular formula of [Ni（L）（phen）2]·5H2O. The T4（2）5（2） water tape and [Ni（L）（phen）2] molecules assemble into a network of water tapes sandwiched between [Ni（L）- （phen）2] tapes. The network is stabilized by π-π stacking between [Ni（L）（phen）2] molecules and three types of hydrogen-bonding interactions between [Ni（L）（phen）2] molecules, water molecules, and water and [Ni（L）（phen）2] molecules.展开更多
A novel coordination polymer [Mg（L）（H2O）2]·H2O] （LH2=L-cysteic acid） has been synthesized and characterized by elemental analysis, IR and single-crystal X-ray diffraction.The crystal crystallizes in orthorh...A novel coordination polymer [Mg（L）（H2O）2]·H2O] （LH2=L-cysteic acid） has been synthesized and characterized by elemental analysis, IR and single-crystal X-ray diffraction.The crystal crystallizes in orthorhombic system, space group P212121, with a=5.962（3）, b=11.224（6）, c=13.664（7）A, V=914.3（8）A^3, Z=4, Mr=245.50, Dc=1.783 g/cm^3,μ=0.445 mm-1,flack parameter=0.32（16）, F（000）=512, the final R=0.0458 and wR=0.1172 for 1578 observed reflections with I 〉 2σ（Ⅰ）. The Mg（Ⅱ） atom shows an octahedral geometry defined by two carboxyl O atoms from two different L-cysteic acid ligands, one carboxyl O atom and one amino N atom from the adjacent ligand, and two aqua ligands. The Mg（Ⅱ） atoms are bridged by L-cysteic acid ligands, leading to a 1D infinite zigzag chain. In the structure there are extensive hydrogen bonds,through which the complex completes its 3D framework structure.展开更多
L cysteic acid was synthesized from L cystine by indirect electroxidation method in this paper.High yield and purity of the product were obtained.The product structure was characterized by IR and 1HNMR, and its TGA cu...L cysteic acid was synthesized from L cystine by indirect electroxidation method in this paper.High yield and purity of the product were obtained.The product structure was characterized by IR and 1HNMR, and its TGA curve was discussed as well.展开更多
FTIR-ATR technique with second-order derivative measurement was used for assessing the amount of oxidation products of cystine present on the plasma-treated wool fabric surface. In this paper, three non-polymerising g...FTIR-ATR technique with second-order derivative measurement was used for assessing the amount of oxidation products of cystine present on the plasma-treated wool fabric surface. In this paper, three non-polymerising gases namely oxygen, nitrogen and 25% hydrogen/75% nitrogen gas mixture were used for the plasma treatment of wool fabric. The oxidation products of cystine studied included S-sulphonate, cysteic acid, cystine monoxide and cystine dioxide. The variations of the amount of these products as a function of treatment time were studied. Experimental results showed that the oxygen plasma could produce a large amount of oxidation products of cystine on the wool fabric surface followed by nitrogen plasma and gas mixture plasma.展开更多
基金supported by the Natural Science Foundation of Guangxi Province (No. 2010GXNSFD013017)
文摘An interesting T4（2）5（2） water tape formed by fused cyclic water pentamers and tetramer was self-assembled in a new inorganic host [Ni（L）（phen）2]·5H2O （L = L-cysteic acid） and characterized by X-ray diffraction. Each [Ni（L）（phen）2] molecule crystallizes with five water molecules with a molecular formula of [Ni（L）（phen）2]·5H2O. The T4（2）5（2） water tape and [Ni（L）（phen）2] molecules assemble into a network of water tapes sandwiched between [Ni（L）- （phen）2] tapes. The network is stabilized by π-π stacking between [Ni（L）（phen）2] molecules and three types of hydrogen-bonding interactions between [Ni（L）（phen）2] molecules, water molecules, and water and [Ni（L）（phen）2] molecules.
基金This work was supported by the Natural Science Foundation of Guangxi Province (No. 0339034)the Science Research Foundation of Guangxi Normal University
文摘A novel coordination polymer [Mg（L）（H2O）2]·H2O] （LH2=L-cysteic acid） has been synthesized and characterized by elemental analysis, IR and single-crystal X-ray diffraction.The crystal crystallizes in orthorhombic system, space group P212121, with a=5.962（3）, b=11.224（6）, c=13.664（7）A, V=914.3（8）A^3, Z=4, Mr=245.50, Dc=1.783 g/cm^3,μ=0.445 mm-1,flack parameter=0.32（16）, F（000）=512, the final R=0.0458 and wR=0.1172 for 1578 observed reflections with I 〉 2σ（Ⅰ）. The Mg（Ⅱ） atom shows an octahedral geometry defined by two carboxyl O atoms from two different L-cysteic acid ligands, one carboxyl O atom and one amino N atom from the adjacent ligand, and two aqua ligands. The Mg（Ⅱ） atoms are bridged by L-cysteic acid ligands, leading to a 1D infinite zigzag chain. In the structure there are extensive hydrogen bonds,through which the complex completes its 3D framework structure.
文摘L cysteic acid was synthesized from L cystine by indirect electroxidation method in this paper.High yield and purity of the product were obtained.The product structure was characterized by IR and 1HNMR, and its TGA curve was discussed as well.
文摘FTIR-ATR technique with second-order derivative measurement was used for assessing the amount of oxidation products of cystine present on the plasma-treated wool fabric surface. In this paper, three non-polymerising gases namely oxygen, nitrogen and 25% hydrogen/75% nitrogen gas mixture were used for the plasma treatment of wool fabric. The oxidation products of cystine studied included S-sulphonate, cysteic acid, cystine monoxide and cystine dioxide. The variations of the amount of these products as a function of treatment time were studied. Experimental results showed that the oxygen plasma could produce a large amount of oxidation products of cystine on the wool fabric surface followed by nitrogen plasma and gas mixture plasma.
