Ultrafast and High-Yield Polaronic Exciton Dissociation in Two-Dimensional Perovskites

2021 ◽  
Author(s):  
Qi Sun ◽  
Chunyi Zhao ◽  
Zixi Yin ◽  
Shiping Wang ◽  
Jing Leng ◽  
...  
Keyword(s):  
High Yield ◽  
Two Dimensional ◽  
Exciton Dissociation

High-yield fabrication of suspended two-dimensional materials for atomic resolution imaging

RSC Advances ◽  
2016 ◽  
Vol 6 (80) ◽  
pp. 76273-76279 ◽  
Author(s):  
Jaehyun Han ◽  
Jun-Young Lee ◽  
Jeongun Choe ◽  
Jong-Souk Yeo
Keyword(s):  
Three Dimensional ◽  
Atomic Resolution ◽  
High Yield ◽  
Two Dimensional ◽  
Two Dimensional Materials ◽  
Resolution Imaging

Two-dimensional (2D) atomic crystals are very interesting materials due to their unique properties, which are significantly different than those observed in conventional three-dimensional (3D) materials.

Selective dismantling of closo-1,2-C2B10H12 to lower-cage dicarbaborane systems

1991 ◽  
Vol 56 (8) ◽  
pp. 1618-1635 ◽  
Author(s):  
Jaromír Plešek ◽  
Bohumil Štíbr ◽  
Xavier L. R. Fontaine ◽  
John D. Kennedy ◽  
Stanislav Heřmánek ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Solution Structure ◽  
High Yield ◽  
Two Dimensional ◽  
Oxidizing Agents ◽  
Elimination Reactions

A modified, high-yield synthesis of the two isomeric nido twelve-vertex [C2B10H13]- anions, "reactive" [nido-7,9-C2B10H13]- and "unreactive" [nido-7,12-C2B10H13]-, has been developed. A solution structure for the reactive [nido-7,9-C2H10B13]- isomer is proposed on the basis of the result of two-dimensional 11B and 1H correlation NMR spectroscopy. It is concluded that there is a marked similarity between this species and the eleven-vertex congener [nido-7,8-C2B9H12]-. In accord with this parallel, the "reactive" twelve-vertex species is found to undergo selective boron-vertex elimination reactions in the presence of oxidizing agents. These reactions give excellent yields of smaller-cage nido dicarbaborane compounds, namely [nido-7,8-C2B9H12]-, [9-(SMe2)-nido-7,8-C2B9H11], and nido-5,6-C2B8H12. NMR spectroscopy assigns cluster 11B and 1H resonances for all the compounds isolated, and thence permits comparison with the equivalent shielding patterns of structurally related analogues such as [nido-7-CB10H13]- and [nido-7,9-C2B9H12]-.

scholarly journals Facile synthesis of high yield two dimensional zinc vanadate nanoflakes

2019 ◽  
Vol 1 (5) ◽  
Author(s):  
Sawsan A. Mahmoud ◽  
Samar H. Bendary ◽  
A. A. Salem ◽  
Osama A. Fouad
Keyword(s):  
High Yield ◽  
Two Dimensional ◽  
Facile Synthesis

Nine- and Eight-Vertex Polyhedral Dicarbaborane Chemistry: New arachno and hypho Dicarbaboranes from arachno-4,5-C2B7H13: Isolation and Characterization of the [arachno-4,5-C2B7H12]- and [hypho-7,8-C2B6H13]- Anions, and of the Neutral Ligand Derivatives exo-6-(MeNC)-arachno-4,5-C2B7H11 and exo-5-L-hypho-4,9-C2B7H13 (L = NMe3 and NEt3)

1994 ◽  
Vol 59 (7) ◽  
pp. 1584-1595 ◽  
Author(s):  
Tomáš Jelínek ◽  
Josef Holub ◽  
Bohumil Štíbr ◽  
Xavier L. R. Fontaine ◽  
John D. Kennedy
Keyword(s):  
Nmr Spectroscopy ◽  
Selective Removal ◽  
High Yield ◽  
Two Dimensional ◽  
Neutral Ligand ◽  
Tertiary Amines ◽  
Proton Sponge ◽  
H Nmr ◽  
Isolation And Characterization

Deprotonation of neutral arachno-4,5-C2B7H13 (1) either with 1, 8-(NMe2)2C10H6 (proton sponge, PS) or with a mixture of aqueous K2CO3 and [NMe4]Cl leads to the isolation in high yield of the [arachno-4,5-C2B7H12]- anion (2). Isostructural with this anion is the ligand derivative exo-6-(MeNC)-arachno-4,5-C2B7H11 (3), which is prepared in 20% yield from the reaction between arachno-4,5-C2B7H13 and MeNC in dichloromethane. Under comparable conditions compound 1 with tertiary amines gives the first representatives of the nine-vertex hypho family of dicarbaboranes, the ligand derivatives exo-5-(NR3)-hypho-4,9-C2B7H13 (4a and 4b, where R = Me and Et, respectively) in moderate yields (20 - 55%), whereas the reaction between 1 and aqueous NaCN results in the selective removal of one boron vertex to yield the eight-vertex [hypho-7,8-C2B6H13]- anion (5) in 61% yield. All compounds isolated were characterized by 11B and 1H NMR spectroscopy, with two-dimensional and selective decoupling techniques giving unambiguous assignments.

Two-dimensional bimetallic CoFe selenite via metal-ion assisted self-assembly for enhanced oxygen evolution reaction

2020 ◽  
Vol 44 (46) ◽  
pp. 20148-20154
Author(s):  
Ling-Li Zhou ◽  
Dong-Sheng Pan ◽  
Zheng-Han Guo ◽  
Jun-Ling Song
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Self Assembly ◽  
Metal Ion ◽  
Hydrothermal Condition ◽  
High Yield ◽  
Two Dimensional ◽  
Simple Metal ◽  
Assembly Strategy

A 2D CoFe selenite crystals was used as an efficient OER catalyst, which was obtained in a high yield via a simple metal-ion self-assembly strategy under hydrothermal condition.

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