硒与溴反应合成独特溴硒酸盐[(CH3)4N]2[Se16Br18]的晶体结构分析

需积分: 9 0 下载量 200 浏览量 更新于2024-08-07 收藏 154KB PDF 举报
"这篇学术论文详细探讨了硒与溴在四甲基铵溴化物存在下于乙腈中反应生成独特溴硒酸盐[(CH3)4N]2[Se16Br18]的过程及晶体结构。研究者们来自立陶宛考纳斯科技大学、挪威卑尔根大学和德国拜罗伊特大学。实验结果表明,当硒和溴的比例为1:1时,在乙腈溶液中添加四甲基铵溴化物,可以得到红色晶体[(CH3)4N]2[Se16Br18]。" 在该化学反应中,硒与溴的摩尔比为1:1,反应环境是乙腈溶液,并且有四甲基铵溴化物作为催化剂或促进剂。这种特定的条件下,生成的产物是一种独特的溴硒酸盐[(CH3)4N]2[Se16Br18]。该盐的晶体结构被确定为单斜晶系,空间群为P21/n,具有以下的晶胞参数:a = 12.1876(4)Å,b = 18.9670(4)Å,c = 12.2390(4)Å,β = 91.908(2)°(在123K温度下)。 在固态结构分析中,[Se16Br18]2- 阴离子由两个[Br(Se2Br2)4]2- 子单元构成,这两个子单元通过一个对称中心相关联,并通过4个弱Se-Br键连接。这些Se-Br键的键长分别为3.2588(9)Å和3.3887(9)Å,这表明它们之间的相互作用相对较弱,但对整个结构的稳定性和独特性至关重要。 这个合成过程展示了无机化学中的配位化学原理,其中硒原子与溴原子通过不同类型的化学键结合,形成复杂的大环结构。四甲基铵阳离子[(CH3)4N+]在此反应中可能起到了稳定阴离子的作用,同时在结晶过程中也起到了重要作用。 此外,这一研究成果对于理解硒与卤素的化学反应机理、新型无机化合物的合成以及材料科学中新型功能材料的设计具有重要意义。通过深入研究这种独特结构的阴离子,科学家们可以探索硒和溴之间的化学相互作用,从而可能发现新的化学反应路径或者在光电子材料、半导体和催化等领域找到潜在的应用。 这篇论文揭示了一种创新的合成方法,通过硒与溴的特定比例反应,生成了一种含有复杂配位结构的溴硒酸盐,为无机化学和材料科学研究提供了新的视角和实验基础。
2023-02-10 上传

润色下面英文:The controlled drug delivery systems, due to their precise control of drug release in spatiotemporal level triggered by specific stimulating factors and advantages such as higher utilization ratio of drug, less side-effects to normal tissues and so forth, provide a new strategy for the precise treatment of many serious diseases, especially tumors. The materials that constitute the controlled drug delivery systems are called “smart materials” and they can respond to the stimuli of some internal (pH, redox, enzymes, etc.) or external (temperature, electrical/magnetic, ultrasonic and optical, etc.) environments. Before and after the response to the specific stimulus, the composition or conformational of smart materials will be changed, damaging the original balance of the delivery systems and releasing the drug from the delivery systems. Amongst them, the photo-controlled drug delivery systems, which display drug release controlled by light, demonstrated extensive potential applications, and received wide attention from researchers. In recent years, photo-controlled drug delivery systems based on different photo-responsive groups have been designed and developed for precise photo-controlled release of drugs. Herein, in this review, we introduced four photo-responsive groups including photocleavage groups, photoisomerization groups, photo-induced rearrangement groups and photocrosslinking groups, and their different photo-responsive mechanisms. Firstly, the photocleavage groups represented by O-nitrobenzyl are able to absorb the energy of the photons, inducing the cleavage of some specific covalent bonds. Secondly, azobenzenes, as a kind of photoisomerization groups, are able to convert reversibly between the apolar trans form and the polar cis form upon different light irradiation. Thirdly, 2-diazo-1,2-naphthoquinone as the representative of the photo-induced rearrangement groups will absorb specific photon energy, carrying out Wolff rearrangement reaction. Finally, coumarin is a promising category photocrosslinking groups that can undergo [2+2] cycloaddition reactions under light irradiation. The research progress of photo-controlled drug delivery systems based on different photo-responsive mechanisms were mainly reviewed. Additionally, the existing problems and the future research perspectives of photo-controlled drug delivery systems were proposed.

2023-02-06 上传