Precursor reaction kinetics control compositional grading and size of CdSe<sub>1−x</sub>S<sub>x</sub> nanocrystal heterostructures
作者:Leslie S. Hamachi、Haoran Yang、Ilan Jen-La Plante、Natalie Saenz、Kevin Qian、Michael P. Campos、Gregory T. Cleveland、Iva Rreza、Aisha Oza、Willem Walravens、Emory M. Chan、Zeger Hens、Andrew C. Crowther、Jonathan S. Owen
DOI:10.1039/c9sc00989b
日期:——
We report a method to control the composition and microstructure of CdSe1-x S x nanocrystals by the simultaneous injection of sulfide and selenide precursors into a solution of cadmium oleate and oleic acid at 240 °C. Pairs of substituted thio- and selenoureas were selected from a library of compounds with conversion reaction reactivity exponents (k E) spanning 1.3 × 10-5 s-1 to 2.0 × 10-1 s-1. Depending
我们报告了一种通过在 240 °C 下将硫化物和硒化物前体同时注入油酸镉和油酸溶液中来控制 CdSe1-x S x 纳米晶体的组成和微观结构的方法。一对取代的硫代和硒脲选自化合物库,其转化反应反应指数 (k E) 跨越 1.3 × 10-5 s-1 至 2.0 × 10-1 s-1。根据相对反应性 (k Se/k S),获得核/壳和合金结构。使用注射泵方法生长厚 CdS 外壳可在单个反应容器中提供克数量的明亮光致发光量子点 (PLQY = 67 至 90%)。动力学模拟预测,小于 10 的相对前体反应率会导致合金成分,而较大的反应性差异会导致突然的界面。CdSe1-x S x 合金 (k Se/k S = 2.4) 显示出两种纵向光学声子模式,具有合金微观结构的成分相关频率特征。当一种前体比另一种更具反应性时,其转化反应性和摩尔分数控制核数、完全转化时的最终纳米晶体尺寸和元素组成。讨论了控制反应性在调整合金微观结构中的作用。
Synthesis, structural characterization and cytotoxicity evaluation of platinum(II) complexes of heterocyclic selenones
作者:Ali Osman S. Altoum、Ján Vančo、Radka Křikavová、Zdeněk Trávníček、Zdeněk Dvořák、Muhammad Altaf、Saeed Ahmad、Adam A.A. Sulaiman、Anvarhusein A. Isab
DOI:10.1016/j.poly.2017.02.027
日期:2017.5
complexes (1–6) with selenones (HLn), having the general formula [Pt(HLn)4]Cl2, were prepared and characterized by elemental analysis, IR and NMR (1H, 13C, 77Se and 195Pt) methods and one of them, [Pt(N-ethylimidazolidine-2-selenone)4]Cl2 (3) by X-ray crystallography. A decrease in the IR frequency of the >C Se mode and an upfield shift in 13C NMR for the >C Se resonance of selenones are consistent with
摘要制备了具有[Pt(HLn)4] Cl2通式的硒酮(HLn)的铂(II)配合物(1-6),并通过元素分析,IR和NMR(1H,13C,77Se和195Pt)进行了表征方法和其中之一,[Pt(N-乙基咪唑烷-2-硒酮)4] Cl2(3)通过X射线晶体学测定。硒酮的> C Se共振,> C Se模式的IR频率降低和13C NMR的高场频移与硒与铂(II)的配位相一致。3的结构由[Pt(L3)4] 2+复合离子和氯离子构成。复杂阳离子中的铂(II)原子采用扭曲的正方形平面几何形状。通过MTT分析评估了复合物以及顺铂在体外对人卵巢癌A2780及其耐顺铂亚系A2780R的体外抗肿瘤活性,人前列腺癌22Rv1和人乳腺腺癌MCF-7细胞株。结果表明,只有一种涉及N-丙基咪唑烷-2-硒酮(4)配体的复合物对A2780细胞(IC50 = 44.7 µM)有效,其水平与顺铂(IC50 = 26.8 µM)相
Solution and solid-state NMR studies of some cadmium–selenone complexes
作者:Mohammed I.M. Wazeer、Anvarhusein A. Isab
DOI:10.1016/j.saa.2005.03.020
日期:2005.12
nucleus in Cd(ImSe)2Cl2 is shielded by 38 ppm on coordination, relative to the free ligand. The principal components of the 77Se, 113Cd and 13C shielding tensors for the complexes were determined from solid-state NMR data. Large selenium chemical shift anisotropies were observed for these complexes.
Synthesis of cyano(selenone)gold(I) complexes and investigation of their scrambling reactions using 13C and 15N NMR spectroscopy
作者:Saeed Ahmad、Anvarhusein A. Isab、Abdul Rahman Al-Arfaj、Alan P. Arnold
DOI:10.1016/s0277-5387(02)01152-x
日期:2002.9
respectively, corresponding to the two equilibrium components, [CSeAuCN] and [Au(CN) 2 ] − . Equilibriumconstants ( K eq ) were determined for the scrambling equilibria by integrating the CN − resonances in the 13 C NMR, recorded at 297 K. K eq values obtained for cyano(selenone)gold(I) complexes are the highest of all the reported values, measured for other complexes.
摘要制备了许多新的氰基(硒烯酮)金(I)配合物,并通过元素分析,IR和NMR方法对了一系列硒酮(咪唑烷-2-硒酮及其衍生物或重氮烷-2-硒酮)进行了表征。从红外数据看,制备的七个络合物中有两个以非离子络合物形式存在[CSeAuCN],而其余五个以离子形式存在[Au(CSe)2] + [Au (CN)2]-处于固态。在溶液中,观察到所有络合物均发生配体加扰反应,表现出平衡[2 [CSeAuCN]⇆[(CSe)2 Au] + [Au(CN)2]-。配合物的配体加扰反应已在DMSO中使用13 C和15 N NMR光谱进行了研究。加扰反应的结果是,在13 C和15 N NMR中,CN-的碳和氮在所有配合物中均观察到两个尖锐的共振,分别对应于两个平衡成分[CSeAuCN ]和[Au(CN)2]-。通过积分13 C NMR中的CN-共振来确定加扰平衡的平衡常数(K eq
Synthesis, X-ray structure and in vitro cytotoxicity of trans-diammineplatinum(II) complexes of selenones, trans-[Pt(NH3)2(selenone)2](NO3)2
作者:Ali Alhoshani、Adam A.A. Seliman、Ali Osman Altoum、Hatem A. Abuelizz、Saeed Ahmad、Muhammad Altaf、Khalid H. Omer、Manzar Sohail、Anvarhusein A. Isab
DOI:10.1016/j.poly.2018.09.010
日期:2019.1
Abstract Seven trans platinum(II) complexes of selenones having the general formula, trans-[Pt(NH3)2(selenone)2](NO3)2 have been synthesized and characterized using elemental analysis, IR, and NMR (1H & 13C & 77Se) spectroscopy. The crystalstructure of one of them, trans-[Pt(NH3)2(PrImSe)2](NO3)2 (5) was determined by single crystal X-ray diffraction analysis. The platinum atom in the complex cation