8-氨基喹哪啶固相萃取光度法测定水中痕量铁(Ⅲ)的研究

根据8-氨基喹哪啶（AQ）与铁（Ⅲ）的显色反应及固相萃取小柱对显色配合物的固相萃取,建立了一种测定水样中μg／L级铁（Ⅲ）的新方法在pH=5．5HAc-NaAc缓冲介质中AQ与铁（Ⅲ）反应,生成分子比为3：1的稳定配合物,该配合物可用Waters Porapak SepPak C18固相萃取小柱富集,富集物用含1％醋酸的乙醇溶液洗脱后用光度法测定。采用该方法测定了儿种水样中微量铁（Ⅲ）的含量,结果令人满意。     

Synthesis and Crystal Structure of a New Tetracopper Complex [Cu(H_2O)_3Cu(HCDTA)]_2(ClO_4)_2·H_2O

A new tetracopper complex [Cu(H2O)3Cu(HCDTA)]2(ClO4)2·H2O (CDTA = transcyclohexane-1,2-diamine-N,N,N′,N′-tetraacetate) has been prepared and characterized by singlecrystal X-ray diffraction analysis. The crystal adopts space group C2/c with a = 16.990(10), b = 9.150(5), c = 29.318(17) , β = 104.289(9)°, V = 4417(4) 3, Z = 4, C28H52Cl2Cu4N4O31, Mr = 1265.80, Dc = 1.904 g/cm3, μ = 2.130 mm-1, F(000) = 2584, T = 293(2) K, the final R = 0.0328 and wR = 0.0809 for 4938 observed reflections (I 2σ(I)). The tetracopper units are interconnected by weak covalent bonds into a layered structure.