An anion-driven Sn2+ exchange reaction in CsPbBr3 nanocrystals towards tunable and high photoluminescence

2018 ◽  
Vol 6 (20) ◽  
pp. 5506-5513 ◽  
Author(s):  
Meng Li ◽  
Xiao Zhang ◽  
Katarzyna Matras-Postolek ◽  
Hsueh-Shih Chen ◽  
Ping Yang
Keyword(s):  
Exchange Reaction ◽  
Octahedral Structure ◽  
Halide Exchange ◽  
Pb Ions ◽  
Complete Exchange

Halide-driven partial and complete exchange of Pb2+ and Sn2+ occurred deliberately. It is found that more Pb ions originated from the Pb–Br species to form Pb–OA complexes. Such halide exchange reaction opened the octahedral structure of CsPbBr3 NCs.

Pandora's box of binary tungsten iodides

2019 ◽  
Vol 48 (5) ◽  
pp. 1547-1561 ◽  
Author(s):  
Markus Ströbele ◽  
Hans-Jürgen Meyer
Keyword(s):  
Partial Pressure ◽  
Exchange Reaction ◽  
New Synthesis ◽  
Halide Exchange

More than 20 binary tungsten iodides have been discovered. This was possible due to a new synthesis of W3I12 through halide exchange reaction and by thermal scanning. Depending on the I2 partial pressure compounds can incorporate or release I2. On heating they undergo self-reduction. Some tungsten iodide clusters can be directly transferred into solution.

Stereoselective Synthesis of Vinyl Iodides through Copper(I)-Catalyzed Finkelstein-Type Halide-Exchange Reaction

Synthesis ◽  
2017 ◽  
Vol 49 (12) ◽  
pp. 2727-2732 ◽  
Author(s):  
Xiujuan Feng ◽  
Haixia Zhang ◽  
Wenbo Lu ◽  
Yoshinori Yamamoto ◽  
Abdulrahman Almansour ◽  
...  
Keyword(s):  
Exchange Reaction ◽  
Potassium Iodide ◽  
Efficient Method ◽  
Stereoselective Synthesis ◽  
Copper Catalyst ◽  
Reaction Conditions ◽  
Halide Exchange ◽  
Vinyl Iodides

An efficient method for the stereoselective synthesis of vinyl iodides is described. The reactions of vinyl bromides with potassium iodide proceed smoothly in the presence of a copper catalyst under mild reaction conditions to produce the corresponding vinyl iodides stereospecifically and in satisfactory to excellent yields.

Tri- and Tetracarbanionic Initiators by a Lithium/Halide Exchange Reaction: Application to Star-Polymer Synthesis

2004 ◽  
Vol 44 (2) ◽  
pp. 284-287 ◽  
Author(s):  
Rachid Matmour ◽  
Arnaud Lebreton ◽  
Constantinos Tsitsilianis ◽  
Ioannis Kallitsis ◽  
Valérie Héroguez ◽  
...  
Keyword(s):  
Exchange Reaction ◽  
Polymer Synthesis ◽  
Star Polymer ◽  
Halide Exchange

Tri- and Tetracarbanionic Initiators by a Lithium/Halide Exchange Reaction: Application to Star-Polymer Synthesis

2004 ◽  
Vol 117 (2) ◽  
pp. 288-291 ◽  
Author(s):  
Rachid Matmour ◽  
Arnaud Lebreton ◽  
Constantinos Tsitsilianis ◽  
Ioannis Kallitsis ◽  
Valérie Héroguez ◽  
...  
Keyword(s):  
Exchange Reaction ◽  
Polymer Synthesis ◽  
Star Polymer ◽  
Halide Exchange

On the relationship between the rate constants for racemization and isotopic exchange

1998 ◽  
Vol 76 (6) ◽  
pp. 643-648 ◽  
Author(s):  
John MW Scott ◽  
Danny Summers
Keyword(s):  
Transition State ◽  
Exchange Reaction ◽  
Rate Constants ◽  
Isotopic Exchange ◽  
Alkyl Halides ◽  
Sufficient Condition ◽  
Isotopic Exchange Kinetics ◽  
Halide Exchange ◽  
Exchange Kinetics ◽  
The Relationship

The relationship between the rate constants that describe the halide ion catalysis of the racemization (kr) of optically alkyl halides and the related isotopic halide exchange reaction (ke) is shown to be valid in two distinct cases. The first is when the racemization and exchange mechanisms follow the classical and conventional SN2 path characterized by a symmetrical trigonal (sp2) transition state. The second envisages the trigonal species characteristic of the SN2 reaction as an intermediate instead of a transition state. The latter mechanism is also shown to be characterized by the relationship kr = 2ke, and hence this diagnostic test is seen to be a necessary but not a sufficient condition for invoking the SN2 mechanism.Key words: racemization, isotopic exchange, kinetics, bimolecular substitution, inversion.

Reversible Halide Exchange Reaction of Organometal Trihalide Perovskite Colloidal Nanocrystals for Full-Range Band Gap Tuning

Nano Letters ◽  
2015 ◽  
Vol 15 (8) ◽  
pp. 5191-5199 ◽  
Author(s):  
Dong Myung Jang ◽  
Kidong Park ◽  
Duk Hwan Kim ◽  
Jeunghee Park ◽  
Fazel Shojaei ◽  
...  
Keyword(s):  
Band Gap ◽  
Exchange Reaction ◽  
Full Range ◽  
Colloidal Nanocrystals ◽  
Halide Exchange ◽  
Band Gap Tuning

Reactivity of Interstitial Cl− Anions in Synthetic Hydrotalcite-Like Materials in the Halide Exchange Reaction with Alkyl Halides

1994 ◽  
Vol 368 ◽  
Author(s):  
Esteban López-Salinas ◽  
Yoshio Ono ◽  
Eiichi Suzuki
Keyword(s):  
Exchange Reaction ◽  
Benzyl Chloride ◽  
Reaction Rate ◽  
Alkyl Halides ◽  
Butyl Chloride ◽  
Butyl Bromide ◽  
Catalytic Behavior ◽  
Interlayer Region ◽  
Halide Exchange ◽  
Complex Anions

ABSTRACTTwo types of synthetic hydrotalcite-like [Mg6Al2(OH)16 ][An−%D;2/n (HT) were prepared where A = Cl− anions (Cl-HT), and NiC42− complex anions (NiCl-HT), in order to examine: (1) the reactivity of Cl− anion (or ligand) towards alkyl halides and (2) their catalytic behavior in the Finkelstein reaction. For instance, 0.4 g of NiCl-HT (Cl−: 1.41 mmol) suspended in 20 cm3 of toluene with 14.1 mmol of butyl bromide at 373 K yielded 42 % butyl chloride after 15 min of reaction. In comparison, NiCl4(Et4N)2 (precursor to prepare NiCl-HT) yielded at the same conditions only 2.4 % of butyl chloride. This indicates a great mobility of Cl− in the interlayer region of HTs. The reaction rate is greatly accelerated using DMF instead of toluene and butanol totally suppressed it. This is consistent with a SN2 mechanism. The halide-exchange reaction between benzyl chloride and butyl bromide is catalyzed by both Cl-HT and NiCl-HT.

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