高氯酸诺氟沙星铜(Ⅱ)(英)

0CommentExtensiveinvestigationshavebeendoneaboutthesupramolecularchemistryofmetalionswithNor-floxacin(H-Norf,1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinolinecarboxylicacid)sincemanyorganiccompoundsusedinmedicinedonothaveapurelyorganicmodeofaction;someareacti-vatedorbiotransformedbymetalions,othershavedi-rectorindirecteffectonthemetalionmetabolism[1~5].ThereactionofCu(ClO4)2·6H2OwithH-Norfunderhydrothermalconditionsgivesamonomericcomplex[Cu(H-Norf)2](ClO4)2(1)inwhichCu髤i…     

CTAB对四磺酸基酞菁钴与Na2S反应的影响

研究了十六烷基三甲基溴化铵（CTAB）对四磺酸基酞菁钴(CoTsPc)与Na₂S反应的影响，发现在CTAB存在下CoTsPc与Na₂S更易发生氧化还原反应生成轴向配合物HSCo(I)TsPc. 讨论了CTAB对该反应的作用机理. 采用多波长、双系数法解析反应平衡混合物的紫外吸收光谱，计算了该反应生成物的组成和反应的平衡常数. 从温度对反应平衡常数影响，得到了该反应的热力学数据. 在CTAB浓度为8.36×10^-3 mol•L^-1及303 K时，反应的ΔGΘ、ΔHΘ和ΔSΘ分别为－17.28 kJ•mol^-1、84.1 kJ•mol^-1 和335 J•mol^-1•K^-1.     

A Novel White Light Emitting Long-lasting Phosphor

A novel white light emitting long-lasting phosphor Cd1-xDyxSiO3 is reported in this letterThe Dy^3 doped CdSiO3 phosphor emits white light. The phosphorescence can be seen with the naked eye in the dark clearly even after the 254nm UV irradiation have been removed for about 30min. In the emission spectrum of 5% Dy^3 doped CdSiO3 phosphor, there are two emission peaks of Dy^3 , 580nm (^4F9/2→^6H13/2) and 486nm (^4F9/2→^6H15/2), as well as a broad band emission located at about 410nm. All the three emissions form a white light with CIE chromaticity coordinates x=0.3874, y=0.3760 and the color temperature is 4000 K under 254 nm excitation. It indicated that this phosphor is a promising new luminescent material for practice application.     

As(Ⅴ)存在下阻尼动力学荧光法测定痕量As(Ⅲ)

基于KBrO3与HCl反应,其产物能使丁基罗丹明B荧光猝灭,在As（Ⅴ）共存时As（Ⅲ）能灵敏抑制该反应,据此建立了测定痕量As（Ⅲ）的新方法.在最佳实验条件下,测定As（Ⅲ）的线性范围为7.7～153.8 ng/mL,方法的检出限为2.9 ng/mL.对30.8和92.3 ng/mL的As（Ⅲ）标准溶液平行测定11次,其相对标准偏差分别为1.3%和0.62%.并考察了常见物质的干扰情况.该方法用于环境水样中痕量As（Ⅲ）分析,回收率在98%～105%之间.并提出了可能的反应机理.     

新颖孤立的金属环组装而成的三维氢键超分子化合物的合成及晶体结构

A novel discrete dinuclear metaUacyclic copper（Ⅱ） complex, [Cu2L2（H2O）2]·3H2O （1） has been firstly prepared where L is derived from the 1 ; 2 condensation of 2,2＇-bipyridyl-3,3＇-diformylhydrazide and acetone during the formation of the complex. Single-crystal X-ray diffraction analysis determines that the complex consists of dinuclear metallacyclic units [Cu2L2（H2O）2] where two metal centers are linked together through two bis（chelating） bridge ligands L to form a bizarre cavity with size 0.9417 nm× 0.4999 nm× 0.6930 nm. Interestingly, the metal coordination also creates hydrogen bond sites that further aggregate these metallacycles into a 3D supramolecular structure with 2D perpendicular hydrophilic tunnels in crystal.     

酰基硫脲分子内氢键与取代基效应的定量关系

对２３个Ｎ－二茂铁甲酰基－Ｎ’－芳基硫脲和４个Ｎ－苯甲酰基－Ｎ’－芳基硫脲的δβ－ＮＨ与各种取代胺的碱性强度ｐＫｂ及苯环下取代基常数σ进行了系统的定量关系研究。结果提示了此类化合物的分子内氢键与取代基效应之间的定量关系。     

EFFECT OF IONIC RADII ON UNIT-CELL VOLUMES OF ISOSTRUCTURAL COMPOUNDS

The relation between cell-edges or unit-cell volumes of isostructural compounds and theionic radii has wide applications in crystal chemistry. The authors have proved: (1) For a series of multiple isostructural compounds such as A_mB_n…X_p, when the anionand other cations are fixed, there exists the following relation between the unit-cell volume Vand the radius r_A of a certain cation such as A: V = (a + br_A)(r_X + r_A)~3 (a and b are constants). (2) For binary isostructural compounds A_mX_p, the above relation is reduced to V = k(r_X + r_A)~3 (k is a constant). (3) For binary isostructural compounds the relation between V and r_A~3 is approximatelylinear, and for multiple compounds, it is often curvilinear but still approximately linear whenthe variation of r_A is slight. As another approximation, a linear relation also exists betweenV and r_A for isostructural compounds. (4) The relation of ce1l-edge a vs. r_A is linear for binary isostructural compounds. Butno such a good linear relation exists fo     

间接液相色谱电化学法测定酯类化合物

本文用间接液相色谱电化学的方法对非电活性的酯类混合物甲酸甲酯、甲酸乙酯、乙酸甲酯和乙酸乙酯进行了分离和测定,其线性范围分别是3.2×10~(-9)～4.4×10~(-8)mol、2.4×10~(-9)～2.8×10~(-8)mol、2.0×10~(-9)～4.0×10~(-8)mol和2.2×10~(-9)～2.4×10~(-8)mol。对甲酸甲酯8次平行测定的相对标准偏差为0.89％。     

毛细管电泳-电化学检测益母草及其冲剂中的黄酮类化合物

用毛细管电泳-电化学检测(CE-ED)法同时测定了益母草及三种益母草冲剂中的根皮苷、橙皮素、芦丁、山奈酚、洋芹素和槲皮素六种黄酮类化合物的含量。考察了实验参数对分离、检测的影响,得到了最佳试验条件。采用300μm碳圆盘电极为工作电极,检测电位为 0.95 V(vs.SCE),在80 mmol/L的Na2B4O7-H3BO3(pH 8.7)的运行缓冲液中,上述各组分在20 min内能完全分离。根皮苷、橙皮素、芦丁、山奈酚、洋芹素、槲皮素在5.00×10-7~1.00×10-4g/mL范围内均与其相应的峰电流呈线性关系,其检出限(S/N=3)分别为4.68×10-7、2.03×10-7、4.68×10-7、2.68×10-7、4.81×10-7、3.61×10-7g/mL。该法应用于实际样品的分析,结果令人满意。     

顶空/气相色谱-质谱法测定圆珠笔中8种挥发性苯系物

建立了顶空/气相色谱-质谱法测定圆珠笔中8种挥发性苯系物(苯、甲苯、乙苯、对二甲苯、间二甲苯、异丙苯、邻二甲苯和苯乙烯)含量的分析方法。选择顶空平衡温度和时间分别为70℃和40 min,以HP-INNOWax色谱柱(60 m×320μm×0.25μm)分离,采用选择离子监测模式(SIM)检测,外标法定量。结果显示,8种苯系物在0.005～0.5 mg/L质量浓度范围内均与对应的峰面积呈良好的线性关系(r~20.999),检出限(S/N=3)为0.01～0.02 mg/kg,加标回收率为86.0%～104%,相对标准偏差(RSD)为2.3%～9.6%。该方法操作简单,快速,且灵敏度高,适用于圆珠笔中挥发性苯系物的快速检测。