The process of synthesis of dimethyl-2,6-naphthalene dicaboxylate from esterification of 2,6-naphthalene dicarboxylic acid (2,6-NDCA) by methanol using sodium tungstate as catalyst was investigated. The orthogonal tes...The process of synthesis of dimethyl-2,6-naphthalene dicaboxylate from esterification of 2,6-naphthalene dicarboxylic acid (2,6-NDCA) by methanol using sodium tungstate as catalyst was investigated. The orthogonal tests method was used for optimizing the process factors. The effects of reaction temperature, mass percentage of catalyst, reaction time and mass ratio of methanol to 2,6-NDCA on the 2,6-NDCA conversion were investigated. It was found that all the four factors had significant effect on the conversion. The optimum reaction conditions were reaction temperature 215 ℃,mass percentage of catalyst 3%, reaction time 3 h, mass ratio of methanol to 2,6-NDCA 6∶1. The 2,6-NDCA conversion at above condition was 92.80%.展开更多
A novel 1D Ladder-like coordination polymer [Na3Er(2,6-PDA)3]·11.5H2O (2,6-H2PDA is pyridine-2,6-dicarboxylic acid) has been synthesized and the crystal structure was determined by X-ray diffraction. The crystal ...A novel 1D Ladder-like coordination polymer [Na3Er(2,6-PDA)3]·11.5H2O (2,6-H2PDA is pyridine-2,6-dicarboxylic acid) has been synthesized and the crystal structure was determined by X-ray diffraction. The crystal structure of the complex belongs to Monoclinic system with space group P21/c, a=0.969 7(3) nm, b=1.914 6(6) nm, c=1.803 1(6) nm, β=91.524(5)°, V=3.346 6(18) mm3, Z=4, Dc=1.863 g·cm-3, μ=2.645 mm-1. The coordination geometry configuration of Er3+ center is tricapped trigonal prism. The structures of the title compound exhibit a novel 1D Ladder-like chain.展开更多
The new complex formulated ·(HOx)2·6H2O(HDPC- is pyridine 2,6 dicarb oxylate,Hoxis 8 Hydroxyquindine) has been synthesized and the crystal structure was determined by X ray diffraction .The crystal structure...The new complex formulated ·(HOx)2·6H2O(HDPC- is pyridine 2,6 dicarb oxylate,Hoxis 8 Hydroxyquindine) has been synthesized and the crystal structure was determined by X ray diffraction .The crystal structure of the complex belongs to monoclinic system with space group C2/c. a=18.423(3)?, b=10.384(2) ?,c=19.139(2)?, α=γ=90°, β=111.050(10)°, V=3417.0(9)?3, Z=4, Dc=1.544Mg·m-3, μ=0.722mm-1. In the crystal Cu? ion is six coordinated to form a distorted octahedron.展开更多
文摘The process of synthesis of dimethyl-2,6-naphthalene dicaboxylate from esterification of 2,6-naphthalene dicarboxylic acid (2,6-NDCA) by methanol using sodium tungstate as catalyst was investigated. The orthogonal tests method was used for optimizing the process factors. The effects of reaction temperature, mass percentage of catalyst, reaction time and mass ratio of methanol to 2,6-NDCA on the 2,6-NDCA conversion were investigated. It was found that all the four factors had significant effect on the conversion. The optimum reaction conditions were reaction temperature 215 ℃,mass percentage of catalyst 3%, reaction time 3 h, mass ratio of methanol to 2,6-NDCA 6∶1. The 2,6-NDCA conversion at above condition was 92.80%.
文摘A novel 1D Ladder-like coordination polymer [Na3Er(2,6-PDA)3]·11.5H2O (2,6-H2PDA is pyridine-2,6-dicarboxylic acid) has been synthesized and the crystal structure was determined by X-ray diffraction. The crystal structure of the complex belongs to Monoclinic system with space group P21/c, a=0.969 7(3) nm, b=1.914 6(6) nm, c=1.803 1(6) nm, β=91.524(5)°, V=3.346 6(18) mm3, Z=4, Dc=1.863 g·cm-3, μ=2.645 mm-1. The coordination geometry configuration of Er3+ center is tricapped trigonal prism. The structures of the title compound exhibit a novel 1D Ladder-like chain.
文摘The new complex formulated ·(HOx)2·6H2O(HDPC- is pyridine 2,6 dicarb oxylate,Hoxis 8 Hydroxyquindine) has been synthesized and the crystal structure was determined by X ray diffraction .The crystal structure of the complex belongs to monoclinic system with space group C2/c. a=18.423(3)?, b=10.384(2) ?,c=19.139(2)?, α=γ=90°, β=111.050(10)°, V=3417.0(9)?3, Z=4, Dc=1.544Mg·m-3, μ=0.722mm-1. In the crystal Cu? ion is six coordinated to form a distorted octahedron.
