排序方式: 共有38条查询结果,搜索用时 15 毫秒
31.
制备了三氮烯修饰碳糊电极(m-NPPAPT/CPE),并研究了Sn(Ⅱ)在该电极上的吸附伏安行为,建立了一种测定痕量锡(Ⅱ)的新方法。采用二阶导数线性扫描溶出伏安法进行分析。结果表明:在1mL 0.5mol/L HCl溶液中,于-1200mV处搅拌富集一定时间,在-1200~-200mV范围内以150mV/s的扫描速度线性扫描,Sn(Ⅱ)吸附在修饰电极表面,于约-476mV(vs SCE)处产生一个灵敏的阳极溶出峰,峰电流比未修饰电极增大约11倍。其峰电流与Sn(Ⅱ)浓度在4.0×10-10~1.0×10-8 mol/L和1.0×10-8~4.0×10-6 mol/L范围内分两段呈良好线性关系,其线性回归方程分别为ip(μA)=1.646C(μmol/L)+2.9566和ip(μA)=52.804C(μmol/L)-0.6402,相关系数分别为0.9973和0.9967;检出限(S/N=3)为2.7×10-10 mol/L(富集时间120s)。本方法操作简便、灵敏度高,应用于罐头食品中锡含量的测定,结果满意。 相似文献
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自制新型1-(5-萘酚-7-磺酸基)-3-[(4-偶氮苯基)苯基]-三氮烯(NASAPAPT)试剂作为荧光试剂,研究其与阴离子表面活性剂十二烷基苯磺酸钠(SDBS)的荧光性能.结果表明,NASAPAPT与SDBS产生荧光猝灭作用,在优化的实验条件下,测定SDBS的线性范围为2.52×10-8~1.06×10-6 mol,L-1内,检出限为1.93×10-8 moL·L-1.方法应用于环境水样中痕量SDBS的测定,回收率在98.39%~102.460%.计算了NASAPAPT与SDBS的热力学函数,表明它们之间主要靠范德华力结合. 相似文献
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在133LYP/6.31 G*理论水平上优化了一系列取代硝基苯类化舍物的几何构型,计算了它们的电子结构和Wiberg键级,结果表明,随着氨基的引入,起爆引发键C-NO2键的强度有可能得到加强,炸药的撞击感度减小.讨论了分子内氢键与其撞击感度的关系,结果表明氢键的形成可能对分子的撞击感度起钝化作用.讨论了C-NO2键的强弱与其位置的关系. 相似文献
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将邻甲基氯苄和对甲基氯苄在适当的溶剂中与锡粉反应,合成了三(邻甲基苄基)氯化锡1和二(对甲基苄基)二氯化锡2,用X射线衍射方法测定了化合物的晶体结构。化合物(1)的晶体属三方晶系,空间群为R3,晶体学参数:a=1.329 36(8) nm,b=1.329 36(8) nm,c=2.147 0(3) nm,α=β=90°,γ=120°,V=3.285 8(5) nm3,Z=6,Dc=1.424 g·cm-3,μ(Mo Kα)=12.93 cm-1,F(000)=1 428,R1=0.037 1,wR=0.110 2。化合物2的晶体属单斜晶系,空间群为C2/c,晶体学参数:a=2.850 4(3) nm,b=0.491 23(5) nm,c=1.215 32(12) nm,β=112.517(2)°,V=1.571 9(3) nm3,Z=4,Dc=1.690 g·cm-3,μ(Mo Kα)=19.49 cm-1,F(000)=792,R1=0.038 0,wR2=0.109 4;中心锡原子为畸变四面体配位构型。 相似文献
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The novel di(o-fluorobenzyl)tin bis(2-quininate) has been synthesized. The crystal structures of the complex was determined by X-ray diffraction. The crystal belongs to triclinic space group
P1 with a=0.770 8(2) nm, b=0.951 9(3) nm, c=1.108 4(3) nm, α=78.260(5)°, β=70.179(4)°, γ=68.594(4)°, V=0.709 4(4)
nm3, Z=1, Dc=1.595 g·cm-3, μ(Mo Kα)=9.57 cm-1, F(000)=342,
R1=0.021 7, wR=0.056 6. The bond length Sn-C is 0.216 9(2) nm,The Sn-O is 0.217 64(15) nm, The Sn-N is 0.233 89(16) nm.This compound is monomeric, with six-coordinated tin atom in a distorted octahedron geometry. The study on title complex has been performed, with quantum chemistry calculation by means of G98W package and taking Lanl2dz basis set. The stabilities of the complex, the orbital energies and characteristics of some frontier molecular orbitals have been investigated. CCDC: 286107. 相似文献
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The title compound {[(C6H5CH2)2Sn]2(O)(Cl2)}2 has been synthesized by the reaction of bisbenzyltin dichloride with NaOH dilute solution, and its structure was determined by X-ray diffraction. The crystal belongs to monoclinic, space group C2/c, with a = 2.5081(17), b = 1.0089(7), c = 2.0909(14) nm, β = 94.267(8)°, V= 5.276(6) nm^3, Z = 4, De= 1.734 g/cm^3,μ(MoKa) = 21.55 cm^-1, F(000) = 2704, R = 0.0398 and Rw = 0.1024. According to structural analysis, the tin atom adopts a distorted five-coordinate trigonal bipyramidal geometry, and the ladder-like structure is shaped by one planar four-membered Sn2O2 ring together with two planar four-membered Sn2OCl rings. 相似文献
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