Elucidating the Key Role of a Lewis Base Solvent in the Formation of Perovskite Films Fabricated from the Lewis Adduct Approach

2017 ◽  
Vol 9 (38) ◽  
pp. 32868-32875 ◽  
Author(s):  
Xiaobing Cao ◽  
Lili Zhi ◽  
Yahui Li ◽  
Fei Fang ◽  
Xian Cui ◽  
...  
Keyword(s):  
Lewis Base ◽  
Lewis Adduct

Can the Lewis basicity of an isolated solvent molecule be used for characterizing solvent effects?

2020 ◽  
Vol 16 ◽  
Author(s):  
Jean-François Gal ◽  
Pierre-Charles Maria
Keyword(s):  
Solvent Effects ◽  
Molecular Level ◽  
Solvent Molecule ◽  
Lewis Base ◽  
Bulk Liquid ◽  
Donor Number ◽  
Special Focus ◽  
Solution Processes ◽  
Inert Solvent

Background: The ubiquitous Lewis acid/base interactions are important in solution processes. Analytical chemistry may benefit of a better understanding of the role of Lewis basicity, at the molecular level or acting through a bulk solvent effect. Objective: To clearly delineate (i) the basicity at a molecular level, hereafter referred as solute basicity, and (ii) the solvent basicity, which is a bulk-liquid property. Method: The literature that relates Lewis basicity scales and solvent effects is analyzed. A special focus is placed on two extensive scales, the Donor Number, DN, and the BF3 affinity scale, BF3A, which were obtained by calorimetric measurement on molecules as solutes diluted in a quasi-inert solvent, and therefore define a molecular Lewis basicity. We discuss the validity of these solute scales when regarded as solvent scales, in particular when the basicity of strongly associated liquids is discussed. Results: We demonstrate the drawbacks of confusing the Lewis basicity of a solvent molecule, isolated as solute, and that of the bulk liquid solvent itself. Conclusion: Consequently, we recommend a reasoned use of the concept of Lewis basicity taking clearly into account the specificity of the process for which a Lewis basicity effect may be invoked. In particular, the action of the Lewis base, either as an isolated entity, or as a bulk liquid, must be distinguished.

Why do zeolites induce an unprecedented electronic state on exchanged metal ions?

2017 ◽  
Vol 19 (36) ◽  
pp. 25105-25114 ◽  
Author(s):  
Akira Oda ◽  
Takahiro Ohkubo ◽  
Takashi Yumura ◽  
Hisayoshi Kobayashi ◽  
Yasushige Kuroda
Keyword(s):  
Metal Ions ◽  
Electronic State ◽  
Base Metal ◽  
Metal Ion ◽  
High Efficiency ◽  
Lewis Base ◽  
Mfi Zeolite ◽  
Adsorption Processes ◽  
Exact Position

Understanding the exact position and the detailed role of the Al array in zeolites is essential for elucidating the origin of unique properties and for designing zeolite materials with high efficiency in catalytic and adsorption processes. In this work, we advanced pivotal roles of Lewis base–metal ion bifunctionality caused by Al atoms arrayed circumferentially in the MFI-zeolite pores.

Tris(pyrazolyl)borate Cobalt-Catalyzed Hydrogenation of C═O, C═C, and C═N Bonds: An Assistant Role of a Lewis Base

2019 ◽  
Vol 21 (8) ◽  
pp. 2693-2698 ◽  
Author(s):  
Yang Lin ◽  
De-Ping Zhu ◽  
Yi-Ran Du ◽  
Rui Zhang ◽  
Suo-Jiang Zhang ◽  
...  
Keyword(s):  
Lewis Base

Role of Lewis-Base-Coordinated Halogen(I) Intermediates in Organic Synthesis: The Journey from Unstable Intermediates to Versatile Reagents

2017 ◽  
Vol 2017 (37) ◽  
pp. 5497-5518 ◽  
Author(s):  
Somraj Guha ◽  
Imran Kazi ◽  
Anuradha Nandy ◽  
Govindasamy Sekar
Keyword(s):  
Organic Synthesis ◽  
Lewis Base

An Investigation into the Role of Incorporated Solvent (EtOH/H2O) Molecules on the Structure of Group 2 Metal bis(β- Diketonate) Complexes: Ramifications for CVD Precursors of Electronic Materials.

1995 ◽  
Vol 415 ◽  
Author(s):  
David J. Otway ◽  
Henry A. Luten ◽  
K. M. Abdul Malik ◽  
Michael B. Hursthouse ◽  
William S. Rees
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Electronic Materials ◽  
Chemical Vapor ◽  
Lewis Base ◽  
Synthesis And Characterization ◽  
Superconducting Metal ◽  
Group 2

ABSTRACTThe synthesis and characterization of thermally stable, volatile, group 2 element-containing complexes is an important prerequisite for the subsequent use of these compounds in chemical vapor deposition (CVD) of superconducting metal oxides (SMO) and other electronic materials, e.g., YBa2Cu3O7-δ. and CaGa2S4:Ce. The utilization of group 2 metal ethoxide compounds {[M(OEt)2(EtOH)4]n (where M = Ca, Sr or Ba)) as precursors to additional complexes is discussed. For example, the compounds [M(tmhd)(OEt)(EtOH)]n (Htmhd = 2,2,6,6- tetramethylheptane-3,5-dione) may be obtained by reacting one equivalent of Htmhd with the metal bis(ethoxide), and these also may be reacted further with functionalized alcohols, or a second β–diketone, to form heteroleptic compounds. Additionally, the preparation and characterization of some Lewis base adducted complexes have been examined with an emphasis on the role that water plays in their isolation.

scholarly journals π-Conjugated Heteroles Containing Group 13 Elements

2021 ◽  
Author(s):  
Sossina Gezahegn
Keyword(s):  
Energy Gap ◽  
Theoretical Calculations ◽  
Building Blocks ◽  
Lewis Base ◽  
Group 13 ◽  
Conjugated Systems ◽  
Energy Gaps ◽  
Potential Formation ◽  
Lewis Adduct ◽  
Homo Lumo

This research targeted the synthesis of group 13 neutral heteroles via transmetallation of the tin atom in stannole moieties. The synthesis of Heteroles of 15a (1-chloro-2,3,4,5-tetraphenylborole), 15b (1-chloro-2,3,4,5-tetraphenylaluminole) and 15c (1-chloro-2,3,4,5-tetraphenylgallole) were attempted. The potential formation of Lewis base adducts were explored through the addition of a coordinating solvent of THF, Et3N, and Et2O and characterized with NMR (1H, 13C and 11B where applicable). It was attempted to synthesize Polymer 17a from the di-brominated borole monomer 16a via a Pd-catalyzed polycondensation reaction. THF was subsequently added to the polymer in an attempt to produce the polymer adduct 17a·THF. This was performed to produce a stable enough material for GPC analysis. The polymer was also characterized with NMR. Theoretical calculations were undertaken at the B3LYP/6-31G* level of DFT to help identify the effect of HOMO-LUMO energy gap of the above heteroles and their adducts. DFT calculations reveal that monomers and oligomer energy gaps can be tuned by substituents attached to the heterole, the type of Lewis adduct formed and the degree of catenation. These monomers and oligomers could potentially be novel building blocks for the synthesis of small energy gap π-conjugated systems.

scholarly journals π-Conjugated Heteroles Containing Group 13 Elements

2021 ◽  
Author(s):  
Sossina Gezahegn
Keyword(s):  
Energy Gap ◽  
Theoretical Calculations ◽  
Building Blocks ◽  
Lewis Base ◽  
Group 13 ◽  
Conjugated Systems ◽  
Energy Gaps ◽  
Potential Formation ◽  
Lewis Adduct ◽  
Homo Lumo

This research targeted the synthesis of group 13 neutral heteroles via transmetallation of the tin atom in stannole moieties. The synthesis of Heteroles of 15a (1-chloro-2,3,4,5-tetraphenylborole), 15b (1-chloro-2,3,4,5-tetraphenylaluminole) and 15c (1-chloro-2,3,4,5-tetraphenylgallole) were attempted. The potential formation of Lewis base adducts were explored through the addition of a coordinating solvent of THF, Et3N, and Et2O and characterized with NMR (1H, 13C and 11B where applicable). It was attempted to synthesize Polymer 17a from the di-brominated borole monomer 16a via a Pd-catalyzed polycondensation reaction. THF was subsequently added to the polymer in an attempt to produce the polymer adduct 17a·THF. This was performed to produce a stable enough material for GPC analysis. The polymer was also characterized with NMR. Theoretical calculations were undertaken at the B3LYP/6-31G* level of DFT to help identify the effect of HOMO-LUMO energy gap of the above heteroles and their adducts. DFT calculations reveal that monomers and oligomer energy gaps can be tuned by substituents attached to the heterole, the type of Lewis adduct formed and the degree of catenation. These monomers and oligomers could potentially be novel building blocks for the synthesis of small energy gap π-conjugated systems.

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