以1,5-二氨基四唑(DAT)与硝酸银为起始原料制备了新型含能配合物[Ag_2(DAT)_4](NO_3)_2,收率86%。用元素分析和傅里叶变换红外光谱法对其结构进行了表征。培养了目标配合物的单晶。用X-射线单晶衍射仪测定了其晶体结构。用差示扫描量热...以1,5-二氨基四唑(DAT)与硝酸银为起始原料制备了新型含能配合物[Ag_2(DAT)_4](NO_3)_2,收率86%。用元素分析和傅里叶变换红外光谱法对其结构进行了表征。培养了目标配合物的单晶。用X-射线单晶衍射仪测定了其晶体结构。用差示扫描量热法研究了其热分解行为。用Kissinger法和Ozawa法计算了其非等温反应动力学参数:活化能E_K和E_O。计算了其热爆炸临界温度T_b。用氧弹测定了其燃烧热Q_v。计算了其标准生成焓Δ_fH~Θ_(298))。测试了目标配合物的摩擦、撞击和火焰感度。结果表明,目标配合物属于单斜晶系,P21/n空间群,晶胞参数为:a=6.8109(9),b=19.654(3),c=8.4510(11),β=102.590(3)°,V=1104.1(3)~3,Z=2,Dc=2.228 g·cm^(-3),F(000)=729。对目标配合物,E_K=204.9 k J·mol^(-1),E_O=202.8 k J·mol^(-1),T_b=224.4℃,Q_v=-4177.59k J·mol^(-1),Δ_fH~Θ_(298)=258.14 k J·mol^(-1),目标配合物对撞击和火焰不敏感,对摩擦较为敏感。展开更多
In this work,a near-beta Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy was fabricated by selective laser melting(SLM),and the microstructure evolution together with the mechanical properties was studied.The as-fabricated alloy...In this work,a near-beta Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy was fabricated by selective laser melting(SLM),and the microstructure evolution together with the mechanical properties was studied.The as-fabricated alloy showed columnarβgrains spreading over multiple layers and paralleling to the building direction.The distinct microstructure of as-fabricated alloy was composed of near-β(more than 98.1%)with a submicron cellular structure.Different SLM processing parameters such as hatch spacing could affect the microstructure of as-fabricated alloy,which could thus further significantly affect the mechanical properties of as-fabricated alloy.In addition,the as-fabricated alloy with the distinct microstructure exhibits yield strength of 818 MPa combined with elongation of more than 19%,which shows that SLM is a potential technology for manufacturing near-beta titanium components.展开更多
A novel compound(H_(2)L)SCN(5⁃methyl⁃3⁃phenyl⁃2H⁃pyrazol⁃1⁃ium thiocyanate)has been obtained by the reaction of thiosemicarbazide with benzoylacetone in ethanol.Two zinccomplexes[Zn(HL)_(2)(NCS)(CH_(3)COO)](1)and[Zn_(...A novel compound(H_(2)L)SCN(5⁃methyl⁃3⁃phenyl⁃2H⁃pyrazol⁃1⁃ium thiocyanate)has been obtained by the reaction of thiosemicarbazide with benzoylacetone in ethanol.Two zinccomplexes[Zn(HL)_(2)(NCS)(CH_(3)COO)](1)and[Zn_(2)(L)_(2)(HL)_(2)(NCS)_(2)]_(2)·2CH_(3)OH(2)have been synthesized by the coordination reactions of Zn(OAc)_(2)·2H_(2)O or ZnCl_(2)with(H_(2)L)SCN under reflux conditions.Elemental analyses and single⁃crystal X⁃ray diffraction have con⁃firmed the structures of the synthesized compounds.The(H_(2)L)SCN ligand and complex 1 pertain to the triclinic sys⁃tem with space group P1,while complex 2 belongs to the monoclinic system with space group P2_(1)/n.Additionally,the antibacterial activities of the compounds were evaluated in vitro using the agar diffusion method against the bac⁃terial strains(Candida albicans,Staphylococcus aureus,and Escherichia coli).The results showed that the ligand exhibited relatively good antibacterial activities against the bacteria,and the complexes possessed stronger antibac⁃terial activities against the same bacteria than the free ligand.CCDC:2190252,(H2L)SCN;2190253,1;2190256,2.展开更多
文摘以1,5-二氨基四唑(DAT)与硝酸银为起始原料制备了新型含能配合物[Ag_2(DAT)_4](NO_3)_2,收率86%。用元素分析和傅里叶变换红外光谱法对其结构进行了表征。培养了目标配合物的单晶。用X-射线单晶衍射仪测定了其晶体结构。用差示扫描量热法研究了其热分解行为。用Kissinger法和Ozawa法计算了其非等温反应动力学参数:活化能E_K和E_O。计算了其热爆炸临界温度T_b。用氧弹测定了其燃烧热Q_v。计算了其标准生成焓Δ_fH~Θ_(298))。测试了目标配合物的摩擦、撞击和火焰感度。结果表明,目标配合物属于单斜晶系,P21/n空间群,晶胞参数为:a=6.8109(9),b=19.654(3),c=8.4510(11),β=102.590(3)°,V=1104.1(3)~3,Z=2,Dc=2.228 g·cm^(-3),F(000)=729。对目标配合物,E_K=204.9 k J·mol^(-1),E_O=202.8 k J·mol^(-1),T_b=224.4℃,Q_v=-4177.59k J·mol^(-1),Δ_fH~Θ_(298)=258.14 k J·mol^(-1),目标配合物对撞击和火焰不敏感,对摩擦较为敏感。
基金Project(2019B010943001)supported by Key-area Research and Development Program of Guangdong Province,ChinaProject(2020)supported by the Fund of State Key Laboratory of Powder Metallurgy,Central South University,China。
文摘In this work,a near-beta Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy was fabricated by selective laser melting(SLM),and the microstructure evolution together with the mechanical properties was studied.The as-fabricated alloy showed columnarβgrains spreading over multiple layers and paralleling to the building direction.The distinct microstructure of as-fabricated alloy was composed of near-β(more than 98.1%)with a submicron cellular structure.Different SLM processing parameters such as hatch spacing could affect the microstructure of as-fabricated alloy,which could thus further significantly affect the mechanical properties of as-fabricated alloy.In addition,the as-fabricated alloy with the distinct microstructure exhibits yield strength of 818 MPa combined with elongation of more than 19%,which shows that SLM is a potential technology for manufacturing near-beta titanium components.
文摘A novel compound(H_(2)L)SCN(5⁃methyl⁃3⁃phenyl⁃2H⁃pyrazol⁃1⁃ium thiocyanate)has been obtained by the reaction of thiosemicarbazide with benzoylacetone in ethanol.Two zinccomplexes[Zn(HL)_(2)(NCS)(CH_(3)COO)](1)and[Zn_(2)(L)_(2)(HL)_(2)(NCS)_(2)]_(2)·2CH_(3)OH(2)have been synthesized by the coordination reactions of Zn(OAc)_(2)·2H_(2)O or ZnCl_(2)with(H_(2)L)SCN under reflux conditions.Elemental analyses and single⁃crystal X⁃ray diffraction have con⁃firmed the structures of the synthesized compounds.The(H_(2)L)SCN ligand and complex 1 pertain to the triclinic sys⁃tem with space group P1,while complex 2 belongs to the monoclinic system with space group P2_(1)/n.Additionally,the antibacterial activities of the compounds were evaluated in vitro using the agar diffusion method against the bac⁃terial strains(Candida albicans,Staphylococcus aureus,and Escherichia coli).The results showed that the ligand exhibited relatively good antibacterial activities against the bacteria,and the complexes possessed stronger antibac⁃terial activities against the same bacteria than the free ligand.CCDC:2190252,(H2L)SCN;2190253,1;2190256,2.
