Phase diagrams and decomposition for systems of (C 2H 5) 2NH·HCl C 6H 10 O 4 (adipic acid) and (C 2H 5) 2NH·HCl C 10 H 18 O 4 (sebacic acid) have been investigated by DTA, DSC and visual polythermal methods....Phase diagrams and decomposition for systems of (C 2H 5) 2NH·HCl C 6H 10 O 4 (adipic acid) and (C 2H 5) 2NH·HCl C 10 H 18 O 4 (sebacic acid) have been investigated by DTA, DSC and visual polythermal methods. Both two systems are of the simple eutectic type. Eutectics are located in 50% of C 6H 10 O 4 at 94 ℃ and 55% of C 10 H 18 O 4 at 106 ℃ respectively. (C 2H 5) 2NH·HCl melts at 217 ℃ and decomposes as soon as it just melted. A polymorphic reaction of (C 2H 5) 2NH·HCl occurs at 98 ℃, the transition heat is 29.7 J/g. Experiments also revealed that adipic acid melts at 152.8—155.7 ℃ with melting heat 199.1 J/g, decomposes at 250.8—263.0 ℃ with decomposition heat 174.2 J/g; sebacic acid melts at 133.1—135.9 ℃ with melting heat 199.8 J/g and decomposes at 233.2—269.2 ℃, but no exact value of decomposition heat has been determined. [WT5HZ]展开更多
采用熔融硼酸法合成了一种具有层状结构的新型水合稀土多硼酸盐,La[B_5O_8(OH)(H_2O)]NO_3·2H_2O,并利用单晶X射线衍射技术确定了它的结构.它属于单斜晶系,P21/n空间群.其基本构建单元(fundamental building block,简称FBB)是由三...采用熔融硼酸法合成了一种具有层状结构的新型水合稀土多硼酸盐,La[B_5O_8(OH)(H_2O)]NO_3·2H_2O,并利用单晶X射线衍射技术确定了它的结构.它属于单斜晶系,P21/n空间群.其基本构建单元(fundamental building block,简称FBB)是由三个BO4和两个BO3基团所构成的一个双三元环[B_5O_(10)]基团.结构中每一个FBB通过共顶点氧原子与周围四个同样的单元连接成具有九元环窗口的二维[B_5O_(10)]层,La3+位于九元环中心附近.[B_5O_(10)]层沿着b方向进行堆积,硝酸根离子和结构中部分结晶水分子位于相邻的[B_5O_(10)]层之间.展开更多
文摘Phase diagrams and decomposition for systems of (C 2H 5) 2NH·HCl C 6H 10 O 4 (adipic acid) and (C 2H 5) 2NH·HCl C 10 H 18 O 4 (sebacic acid) have been investigated by DTA, DSC and visual polythermal methods. Both two systems are of the simple eutectic type. Eutectics are located in 50% of C 6H 10 O 4 at 94 ℃ and 55% of C 10 H 18 O 4 at 106 ℃ respectively. (C 2H 5) 2NH·HCl melts at 217 ℃ and decomposes as soon as it just melted. A polymorphic reaction of (C 2H 5) 2NH·HCl occurs at 98 ℃, the transition heat is 29.7 J/g. Experiments also revealed that adipic acid melts at 152.8—155.7 ℃ with melting heat 199.1 J/g, decomposes at 250.8—263.0 ℃ with decomposition heat 174.2 J/g; sebacic acid melts at 133.1—135.9 ℃ with melting heat 199.8 J/g and decomposes at 233.2—269.2 ℃, but no exact value of decomposition heat has been determined. [WT5HZ]
文摘采用熔融硼酸法合成了一种具有层状结构的新型水合稀土多硼酸盐,La[B_5O_8(OH)(H_2O)]NO_3·2H_2O,并利用单晶X射线衍射技术确定了它的结构.它属于单斜晶系,P21/n空间群.其基本构建单元(fundamental building block,简称FBB)是由三个BO4和两个BO3基团所构成的一个双三元环[B_5O_(10)]基团.结构中每一个FBB通过共顶点氧原子与周围四个同样的单元连接成具有九元环窗口的二维[B_5O_(10)]层,La3+位于九元环中心附近.[B_5O_(10)]层沿着b方向进行堆积,硝酸根离子和结构中部分结晶水分子位于相邻的[B_5O_(10)]层之间.
基金The project was supported by the National Key Basic Research Project of China(973)(2010CB833103)Scientific Research Key Program of Beijing Municipal Commission of Education,China(KM201010005019)~~
基金supported by the National Natural Science Foundation of China(20771008)Scientific Research Key Program of Beijing Municipal Commission of Education,China(KM201010005019)National Key Basic Research Project of China(2010CB833103)~~
