Lewis Acid – Base Interactions Between Bis-π-cyclopentadienyl Tungsten and Molybdenum Dihydrides, Cp2MH2, and some Main Group III Moieties

1971 ◽  
Vol 49 (15) ◽  
pp. 2504-2507 ◽  
Author(s):  
A. Storr ◽  
B. S. Thomas
Keyword(s):  
Lewis Acid ◽  
Lewis Acids ◽  
Benzene Solution ◽  
Main Group ◽  
Acid Base ◽  
Group Iii ◽  
Lewis Bases

Combination of the Lewis bases Cp2MH2 (where M = W or Mo) with the Group III Lewis acids AlR3 (where R = Me, Et, or Ph) and AlMe2H has yielded a series of 1:1 complexes of the type Cp2MH2•AlR3. A number of the complexes undergoes a slow elimination of hydrogen or alkane in benzene solution. Attempts to isolate mixed hydride adducts of the type, Cp2MH2•M′H3 (where M′ = Al or Ga), were unsuccessful.

Radicals derived from Lewis acid/base pairs

2019 ◽  
Vol 48 (13) ◽  
pp. 3454-3463 ◽  
Author(s):  
Liu Leo Liu ◽  
Douglas W. Stephan
Keyword(s):  
Lewis Acid ◽  
Lewis Acids ◽  
Main Group ◽  
Acid Base ◽  
Base Pairs ◽  
Donor And Acceptor ◽  
Acceptor Molecules

While conventional approaches to stabilizing main group radicals have involved the use of Lewis acids or bases, this tutorial review focuses on new avenues to main group radicals derived from combinations of donor and acceptor molecules.

Lewis acids in situ modulate pyridazine-imine Ni catalysed ethylene (co)polymerisation

2019 ◽  
Vol 43 (34) ◽  
pp. 13630-13634 ◽  
Author(s):  
Guohong Wang ◽  
Min Li ◽  
Wenmin Pang ◽  
Min Chen ◽  
Chen Tan
Keyword(s):  
Electron Density ◽  
Lewis Acid ◽  
Lewis Acids ◽  
Acid Base ◽  
Base Interaction ◽  
Acid Base Interaction

The Lewis acid-base interaction between B(iii) Lewis acids and the pyridazine moiety reduced the electron density from the Ni center and in situ modulated the pyridazine-imine nickel catalyzed ethylene (co)polymerisation.

scholarly journals The Role of Carbonium Ions in Color Reception

1965 ◽  
Vol 48 (5) ◽  
pp. 753-760 ◽  
Author(s):  
Paul E. Blatz
Keyword(s):  
Lewis Acid ◽  
Lewis Acids ◽  
Benzene Solution ◽  
Fundamental Property ◽  
Conjugated Systems ◽  
Carbonium Ion ◽  
Carbonium Ions ◽  
Ion Treatment ◽  
Good Agreement

It is a fundamental property of conjugated systems to accept a proton or Lewis acid and form a stable carbonium ion. Polyenes that are protonated or add Lewis acids in this manner undergo substantial red shifts. For example, vitamin A1 acetate absorbs at 350 mµ in neutral and at 650 mµ in acidic benzene solution. The fundamental basis for absorption of polyene systems was described in detail in quantum mechanical terms. Applying the carbonium ion treatment to the visual chromophores retinal1 and retinal2 gives a very satisfactory explanation why these polyenes can be made to absorb in the visual region. Furthermore, by proper placement of the Lewis acid several absorption maxima can be gained from the carbonium ions which result. This treatment can be applied to explain experimental results. Individual cones from the frog are now known to absorb at 455, 537, and 625 mµ. If the value for the green cone (537 mµ) is used to calculate the Vo value in Kuhn's equation, the other two wave lengths may then be calculated. The calculated values are 460 and 600 mµ; this is in good agreement with the results from experiment.

Methyl group exchanges in Lewis acid-base adducts of Group III trimethyl compounds

1972 ◽  
Vol 94 (2) ◽  
pp. 378-384 ◽  
Author(s):  
Theodore L. Brown ◽  
Lawrence L. Murrell
Keyword(s):  
Lewis Acid ◽  
Acid Base ◽  
Methyl Group ◽  
Group Iii

Interactions of Verkade’s Superbase with Strong Lewis Acids: From Labile Mono- and Binuclear Lewis Acid–Base Complexes to Phosphenium Cations

2017 ◽  
Vol 56 (17) ◽  
pp. 10748-10759 ◽  
Author(s):  
Suresh Mummadi ◽  
Dustin Kenefake ◽  
Rony Diaz ◽  
Daniel K. Unruh ◽  
Clemens Krempner
Keyword(s):  
Lewis Acid ◽  
Lewis Acids ◽  
Acid Base

Main Group Lewis Acid/Base-Stabilised Phosphanylboranes

2007 ◽  
Vol 2007 (15) ◽  
pp. 2136-2143 ◽  
Author(s):  
Ariane Adolf ◽  
Manfred Zabel ◽  
Manfred Scheer
Keyword(s):  
Lewis Acid ◽  
Main Group ◽  
Acid Base

scholarly journals Crystal structure of an ordered [WOF5]− salt: (1,10-phen-H)[WOF5] (1,10-phen = 1,10-phenanthroline)

2020 ◽  
Vol 76 (8) ◽  
pp. 1345-1348 ◽  
Author(s):  
Douglas Turnbull ◽  
Michael Gerken
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Lewis Acid ◽  
Crystal Packing ◽  
Main Group ◽  
Bond Valence ◽  
Donor Ligands ◽  
Acid Base ◽  
Hydrolysis Of

Crystals of 1,10-phenanthrolinium pentafluoridooxidotungstate(VI), (1,10-phen-H)[WOF5] (1,10-phen = 1,10-phenanthroline, C12H8N2), were obtained upon hydrolysis of WF6(1,10-phen) in CH3CN at 193 K. The (1,10-phen-H)[WOF5] salt contains a rare example of a [WOF5]− anion in which the oxygen and fluorine atoms are ordered. This ordering was verified by bond-valence determinations and structural comparisons with [Xe2F11][WOF5] and Lewis acid-base adducts of WOF4 with main-group donor ligands. The crystal packing is controlled by N—H...F hydrogen bonding that is directed exclusively to the axial F atom as a result of its increased basicity caused by the trans influence of the oxido ligand.

Fabrication of high quality perovskite films by modulating the Pb–O bonds in Lewis acid–base adducts

2017 ◽  
Vol 5 (18) ◽  
pp. 8416-8422 ◽  
Author(s):  
X. B. Cao ◽  
C. L. Li ◽  
L. L. Zhi ◽  
Y. H. Li ◽  
X. Cui ◽  
...  
Keyword(s):  
Solar Cells ◽  
Lewis Acid ◽  
Perovskite Solar Cells ◽  
Acid Base ◽  
High Quality ◽  
Lewis Bases ◽  
Lewis Adduct

The performance of perovskite solar cells is enhanced by modulating the Pb–O bond in a Lewis adduct via adding some strong Lewis bases into PbI2/DMF solutions.

Lewis acid addticts of α,β-unsaturated carbonyl and nitrile compounds. A calorimetric study

1982 ◽  
Vol 60 (6) ◽  
pp. 809-812 ◽  
Author(s):  
Ronald F. Childs ◽  
D. Lindsay Mulholland ◽  
Alan Nixon
Keyword(s):  
Lewis Acid ◽  
Qualitative Agreement ◽  
Lewis Acids ◽  
Mesityl Oxide ◽  
Poor Correlation ◽  
Calorimetric Study ◽  
Lewis Bases ◽  
Quantitative Correlation

Enthalpies of complexation of the α,β-unsaturated Lewis bases crotonaldehyde, 1; methyl crotonate, 2; mesityl oxide, 3; and crotononitrile, 4; with each of the Lewis acids SnCl4, TiCl4, SbCl5, and BCl3 were measured in solution in CH2Cl2. The results indicate that while a qualitative agreement exists in the ranking of Lewis acids for each of the Lewis bases, there is only a modest quantitative correlation. Similarly, when compared with an nmr-derived Lewis acid scale, the enthalpies were found to agree with the qualitative ranking of Lewis acids, but exhibited only a poor correlation.

scholarly journals Carboranes as Lewis Acids: Tetrel Bonding in CB11H11 Carbonium Ylide

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 391
Author(s):  
Maxime Ferrer ◽  
Ibon Alkorta ◽  
José Elguero ◽  
Josep M. Oliva-Enrich
Keyword(s):  
Lewis Acid ◽  
Lewis Acids ◽  
Molecular Electrostatic Potential ◽  
Weak Interactions ◽  
Topological Analysis ◽  
Closed Shell ◽  
Lewis Bases ◽  
High Level ◽  
Quantum Chemical Computations ◽  
Vacant Orbital

High-level quantum-chemical computations (G4MP2) are carried out in the study of complexes featuring tetrel bonding between the carbon atom in the carbenoid CB11H11—obtained by hydride removal in the C-H bond of the known closo-monocarbadodecaborate anion CB11H12(−) and acting as Lewis acid (LA)—and Lewis bases (LB) of different type; the electron donor groups in the tetrel bond feature carbon, nitrogen, oxygen, fluorine, silicon, phosphorus, sulfur, and chlorine atomic centres in neutral molecules as well as anions H(−), OH(−), and F(−). The empty radial 2pr vacant orbital on the carbon centre in CB11H11, which corresponds to the LUMO, acts as a Lewis acid or electron attractor, as shown by the molecular electrostatic potential (MEP) and electron localization function (ELF). The thermochemistry and topological analysis of the complexes {CB11H11:LB} are comprehensively analysed and classified according to shared or closed-shell interactions. ELF analysis shows that the tetrel C⋯X bond ranges from very polarised bonds, as in H11B11C:F(-) to very weak interactions as in H11B11C⋯FH and H11B11C⋯O=C=O.

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