ENDOR study of anthraquinone paramagnetic complexes with Lewis acid centers of aluminium oxide

In disk drives of current generation, the thickness of the disk lubricant has been reduced to the level of a sub-monomolecular film. For a mono- or a sub-monomolecular film of a perfluoropolyether terminated with a primary hydroxyl unit at both ends, each lubricant molecular chain is chemically bound to the carbon substrate at both termini, and if it has a hydrocarbon sector inserted at its center, the hydrocarbon sectors would assemble at the top of the film. They are thus poised most aptly to react as a Lewis base (an electron donor) to the Lewis acid centers on the slider thus abating the Lewis acid-catalyzed lubricant degradation.

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Metal–Organic Framework Based upon the Synergy of a Brønsted Acid Framework and Lewis Acid Centers as a Highly Efficient Heterogeneous Catalyst for Fixed-Bed Reactions

Journal of the American Chemical Society ◽

10.1021/jacs.5b01352 ◽

2015 ◽

Vol 137 (12) ◽

pp. 4243-4248 ◽

Cited By ~ 174

Author(s):

Baiyan Li ◽

Kunyue Leng ◽

Yiming Zhang ◽

James J. Dynes ◽

Jian Wang ◽

...

Keyword(s):

Heterogeneous Catalyst ◽

Lewis Acid ◽

Metal Organic Framework ◽

Fixed Bed ◽

Highly Efficient ◽

Brönsted Acid ◽

Metal Organic ◽

Acid Centers ◽

Efficient Heterogeneous Catalyst ◽

Organic Framework

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Boron and other Triel Lewis Acid Centers: From Hypovalency to Hypervalency

ChemPhysChem ◽

10.1002/cphc.201402344 ◽

2014 ◽

Vol 15 (14) ◽

pp. 2985-2993 ◽

Cited By ~ 79

Author(s):

Sławomir J. Grabowski

Keyword(s):

Lewis Acid ◽

Acid Centers

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The crucial roles of guest water in a biocompatible coordination network in the catalytic ring-opening polymerization of cyclic esters: a new mechanistic perspective

Chemical Science ◽

10.1039/c9sc06024c ◽

2020 ◽

Vol 11 (12) ◽

pp. 3345-3354 ◽

Cited By ~ 3

Author(s):

Sheng-Chun Chen ◽

Fei-Hang Zhang ◽

Kun-Lin Huang ◽

Feng Tian ◽

Zhi-Hui Zhang ◽

...

Keyword(s):

Lewis Acid ◽

Ring Opening ◽

Ring Opening Polymerization ◽

Cyclic Esters ◽

Polymerization Mechanism ◽

Synergistic Catalysis ◽

Coordination Network ◽

Coordination Framework ◽

Acid Centers ◽

Brønsted And Lewis Acid

A new ring-opening polymerization mechanism is unveiled based on synergistic catalysis involving Brønsted and Lewis acid centers in a coordination framework.

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and Cyclic Hydrocarbons on y-Aluminium Oxide

Zeitschrift für Naturforschung A ◽

10.1515/zna-1970-0520 ◽

1970 ◽

Vol 25 (5) ◽

pp. 688-692 ◽

Cited By ~ 2

Author(s):

Manlio Sanesi ◽

Vittoriano Wagner

Keyword(s):

Double Bond ◽

Adsorption Energy ◽

Surface Coverage ◽

Aluminium Oxide ◽

Unsaturated Hydrocarbons ◽

Cyclic Hydrocarbons ◽

Heats Of Adsorption ◽

Adsorbent Surface ◽

Acid Centers ◽

Adsorption Heats

The heats of adsorption on weakly activated γ-Al2O3 of a number of linear 1-monoolefins (C4 to C9) and cyclic saturated and unsaturated hydrocarbons have been measured by gas-solid chromatography and extrapolated to zero surface coverage.The double bond contribution to the adsorption energy is shown by comparison of the adsorption heats with those of the corresponding saturated molecules and is related to the existence of Brensted acid centers on the adsorbent surface. The effect of cyclization is also shown.

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Strong Lewis acidic catalysts for C–F bond activation by fluorination of activated γ-Al2O3

Catalysis Science & Technology ◽

10.1039/c9cy01585j ◽

2020 ◽

Vol 10 (2) ◽

pp. 391-402

Author(s):

Clara Patricia Marshall ◽

Gudrun Scholz ◽

Thomas Braun ◽

Erhard Kemnitz

Keyword(s):

Lewis Acid ◽

Bond Activation ◽

Aluminium Oxide ◽

Acid Catalyst ◽

Acidic Catalysts ◽

Lewis Acid Catalyst

A strong solid Lewis acid catalyst has been successfully obtained by modifying a known procedure of fluorinating γ-aluminium oxide, which was pre-calcined under vacuum.

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