纳米晶合成的衍生方法是用酸层叠加的双重矿与阿利法氨基: (Cn H(2n+1) NH3) 4AgBiI8
Pascal Rusch1, Ann Mary Antony1,2, Meenakshi Pegu1
1Nanochemistry, Italian Institute of Technology, Via Morego 30, 16163 Genova, Italy.
概括
研究人员开发了一种快速合成稳定,无的化物层叠双重矿石. 这些材料表现出有希望的光电子性能,类似于以为基础的对应物,用于未来的应用.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 无机化学 无机化学
背景情况:
- 无二氧化双矿具有低毒性和小带间隙.
- 它们的合成具有挑战性,因为与化物和化物类似物相比,它们的结构稳定性较低.
- 分层有机-无机矿可以克服稳定性限制.
研究的目的:
- 开发一种易于合成的路径,用于化物分层的双重矿.
- 研究这些新型材料的结构,光学和热性能.
- 探索它们作为基矿替代品的潜力.
主要方法:
- 快速沉合成灵感来自合纳米晶的方法.
- 用X射线衍射来确定晶体结构.
- 紫外线-Vis光谱学和用于频段间隙分析的理论计算.
- 用于相位过渡研究的热分析和取决于温度的衍射.
主要成果:
- 成功合成了 (CnH2n+1NH3) 4AgBiI8 (n = 10,12,14) 层层的双重矿石.
- 单晶晶体结构,交替的[AgI6]和[BiI6]八面体,通过XRD证实.
- 实验和理论频段间隙被确定为2.1 eV.
- 观察了相位过渡,发现它们与以为基础的分层矿相似.
结论:
- 一种快速沉的方法使得能够合成稳定的,无的二层双重矿.
- 这些材料具有理想的光电子特性 (2.1 eV带间隙).
- 它们的相位过渡行为与以为基础的类型相似,表明类似应用的潜力.
相关概念视频
Basicity of Aliphatic Amines
6.9K
Amines can behave as Brønsted–Lowry bases by accepting a proton from the acid to form corresponding conjugate acids. Due to a lone pair of nonbonding electrons, aliphatic amines can also act as Lewis bases by forming a covalent bond with an electrophile.
To measure the basicity of amines, two conventions are generally used. The first defines Kb as the basicity constant for the deprotonation reaction of water by the amine, as presented in Figure 1. Conventionally, lower Kb indicates higher...
To measure the basicity of amines, two conventions are generally used. The first defines Kb as the basicity constant for the deprotonation reaction of water by the amine, as presented in Figure 1. Conventionally, lower Kb indicates higher...
6.9K
Preparation of 1° Amines: Gabriel Synthesis
4.6K
Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
4.6K
Preparation of 1° Amines: Azide Synthesis
4.6K
Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
4.6K
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism
4.1K
The Hofmann and Curtius rearrangement reactions can be applied to synthesize primary amines from carboxylic acid derivatives such as amides and acyl azides. In the Hofmann rearrangement, a primary amide undergoes deprotonation in the presence of a base, followed by halogenation to generate an N-haloamide. A second proton abstraction produces a stabilized anionic species, which rearranges to an isocyanate intermediate via an alkyl group migration from the carbonyl carbon to the neighboring...
4.1K
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview
3.7K
In the presence of an aqueous base and a halogen, primary amides can lose the carbonyl (as carbon dioxide) and undergo rearrangement to form primary amines. This reaction, called the Hofmann rearrangement, can produce primary amines (aryl and alkyl) in high yields without contamination by secondary and tertiary amines.
3.7K
Frustration and Conflict: Avoidance-Avoidance, Double-Approach Avoidance
680
Avoidance-avoidance conflict refers to a psychological situation where a person must choose between two or more unpleasant alternatives. These conflicts are particularly stressful because neither option is desirable. This dilemma is often expressed in sayings like "caught between a rock and a hard place" or "between the devil and the deep blue sea." For instance, individuals who fear dental procedures may find themselves torn between enduring a painful toothache or facing the...
680


