Selective oxidation of sulfide catalysed by Cu complex of a triazamacrocyclic ligand with carbamoyl pendant arms
作者:Rui Liu、Li-zhen Wu、Xi-mei Feng、Zhong Zhang、Yi-zhi Li、Zhi-lin Wang
DOI:10.1016/j.ica.2006.08.008
日期:2007.2
Abstract Copper(II) complex with a new ligand 1,4,7-tris(carbamoylethyl)-1,4,7-triazacyclononane (L) has been synthesized and characterized by elemental analysis, FT-IR, ES-MS, UV–Vis and cyclic voltammetry. Determined by X-ray analysis, the crystal structure shows the metal center is six-coordinated. The compound can catalyze the oxygenation of ethyl phenyl sulfide (EPS) utilizing H2O2 under ambient
摘要合成了具有新配体1,4,7-三(氨基甲酰基乙基)-1,4,7-三氮杂环壬烷(L)的铜(II)配合物,并通过元素分析,FT-IR,ES-MS,UV-可见光和循环伏安法。通过X射线分析确定,晶体结构表明金属中心是六配位的。该化合物可在环境条件下利用H2O2催化乙基苯硫醚(EPS)的氧化。通过1 H NMR光谱证实,将EPS逐步转化为相应的亚砜和砜。GC-MS鉴定了亚砜和砜的存在。EPS在290 nm处的紫外线吸收逐渐消失与硫化物消耗速率显着相关。前3 h的初始反应速率与底物浓度的一阶定律一致。25°C时的平均伪一阶速率常数经计算为(2.25±0.42)×10−3 min-1和30°C时为(4.44±0.17)×10−3 min-1。通过选择铜络合物(占基质的2%)和H2O2(相当于基质的7倍)的摩尔浓度,氧化产物几乎是亚砜。