Gas-Phase Lewis Acidity of Perfluoroaryl Derivatives of Group 13 Elements

2008 ◽  
Vol 27 (3) ◽  
pp. 371-380 ◽  
Author(s):  
Alexey Y. Timoshkin ◽  
Gernot Frenking
Keyword(s):  
Gas Phase ◽  
Lewis Acidity ◽  
Group 13 ◽  
Derivatives Of

Preparation and Pyrolysis of Stereoisomeric Bromobicyclo[n.1.0]alkanes ( n = 6, 8 , 10)

1987 ◽  
Vol 42 (4) ◽  
pp. 489-494 ◽  
Author(s):  
Eckehard V. Dehmlow ◽  
Roland Kramer
Keyword(s):  
Thermal Stability ◽  
Gas Phase ◽  
Condensed Phase ◽  
Secondary Products ◽  
Gas Phase Reactions ◽  
Stereoselective Reduction ◽  
Derivatives Of ◽  
Thermal Stability Of

Abstract The title compounds la-3c were prepared by stereoselective reduction of the respective dibromides. Pyrolysis gave allylic bromides (8, 9, 11) as primary and dienes (10, 12) as secondary products. Product ratios were independent of the stereochemistry of the starting materials. No differences of the rearrangement rates of the stereoisomers were observed in gas phase reactions of the derivatives of bicyclo[6.1.0]- and bicyclo[8.1.0]alkanes. With the larger bicyclo[10.1.0] derivatives, however, distinct differences in the thermal stability of cis-trans-isomers4c/5c or 2c/3c were found in condensed phase.

Do Solid-State Structures Reflect Lewis Acidity Trends of Heavier Group 13 Trihalides? Experimental and Theoretical Case Study

2012 ◽  
Vol 51 (21) ◽  
pp. 11602-11611 ◽  
Author(s):  
Alexey Y. Timoshkin ◽  
Michael Bodensteiner ◽  
Tatiana N. Sevastianova ◽  
Anna S. Lisovenko ◽  
Elena I. Davydova ◽  
...  
Keyword(s):  
Solid State ◽  
Lewis Acidity ◽  
Group 13 ◽  
Solid State Structures

scholarly journals Methylamines as Nitrogen Precursors in Chemical Vapor Deposition of Gallium Nitride

2018 ◽  
Author(s):  
Karl Rönnby ◽  
Sydney C. Buttera ◽  
Polla Rouf ◽  
Sean Barry ◽  
Lars Ojamäe ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Surface Chemistry ◽  
Gas Phase ◽  
Vapor Deposition ◽  
Electronic Device ◽  
Chemical Vapor ◽  
Group 13 ◽  
Gas Phase Chemistry ◽  
Device Applications ◽  
Phase Chemistry

Chemical vapor deposition (CVD) is one of the most important techniques for depositing thin films of the group 13 nitrides (13-Ns), AlN, GaN, InN and their alloys, for electronic device applications. The standard CVD chemistry for 13-Ns use ammonia as the nitrogen precursor, however, this gives an inefficient CVD chemistry forcing N/13 ratios of 100/1 or more. Here we investigate the hypothesis that replacing the N-H bonds in ammonia with weaker N-C bonds in methylamines will permit better CVD chemistry, allowing lower CVD temperatures and an improved N/13 ratio. Quantum chemical computations shows that while the methylamines have a more reactive gas phase chemistry, ammonia has a more reactive surface chemistry. CVD experiments using methylamines failed to deposit a continuous film, instead micrometer sized gallium droplets were deposited. This study shows that the nitrogen surface chemistry is most likely more important to consider than the gas phase chemistry when searching for better nitrogen precursors for 13-N CVD.

scholarly journals Methylamines as Nitrogen Precursors in Chemical Vapor Deposition of Gallium Nitride

2019 ◽  
Author(s):  
Karl Rönnby ◽  
Sydney C. Buttera ◽  
Polla Rouf ◽  
Sean Barry ◽  
Lars Ojamäe ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Surface Chemistry ◽  
Gas Phase ◽  
Vapor Deposition ◽  
Electronic Device ◽  
Chemical Vapor ◽  
Group 13 ◽  
Gas Phase Chemistry ◽  
Device Applications ◽  
Phase Chemistry

Chemical vapor deposition (CVD) is one of the most important techniques for depositing thin films of the group 13 nitrides (13-Ns), AlN, GaN, InN and their alloys, for electronic device applications. The standard CVD chemistry for 13-Ns use ammonia as the nitrogen precursor, however, this gives an inefficient CVD chemistry forcing N/13 ratios of 100/1 or more. Here we investigate the hypothesis that replacing the N-H bonds in ammonia with weaker N-C bonds in methylamines will permit better CVD chemistry, allowing lower CVD temperatures and an improved N/13 ratio. Quantum chemical computations shows that while the methylamines have a more reactive gas phase chemistry, ammonia has a more reactive surface chemistry. CVD experiments using methylamines failed to deposit a continuous film, instead micrometer sized gallium droplets were deposited. This study shows that the nitrogen surface chemistry is most likely more important to consider than the gas phase chemistry when searching for better nitrogen precursors for 13-N CVD.

Gas-Phase Stability of Derivatives of thecloso-Hexaborate Dianion B6H62-

2002 ◽  
Vol 124 (17) ◽  
pp. 4910-4917 ◽  
Author(s):  
N. Zint ◽  
A. Dreuw ◽  
L. S. Cederbaum
Keyword(s):  
Gas Phase ◽  
Phase Stability ◽  
Derivatives Of

A Comparative Study of the BJH- and MCYL-Type Potentials Applied to the Gaseous Water Dimer

1991 ◽  
Vol 46 (5) ◽  
pp. 426-432
Author(s):  
Zdenek Slanina
Keyword(s):  
Gas Phase ◽  
Minimum Energy ◽  
Water Dimer ◽  
Energy Structure ◽  
Water Molecules ◽  
Constant Matrix ◽  
Force Constant Matrix ◽  
Molecular Force ◽  
Phase Water ◽  
Derivatives Of

AbstractVarious refined potentials describing the intra- and inter-molecular force fields of water molecules arc used to calculate the properties of the gas-phase water dimer. The intra-molecular parts have been taken from spectroscopic or quantum-chemical sources. The minimum energy structure was found iteratively using the first derivatives of the potential; the force-constant matrix was constructed by numerical difierentation. A quite close agreement between the Bopp-Jancso-Heinzinger and the Matsuoka-Clementi-Yoshimine-Lie potentials is found. The treatment is applied to seven observed water-dimer isotopomeric isomerizations

Increasing Lewis acidity in perchlorophenyl derivatives of antimony

2019 ◽  
Vol 897 ◽  
pp. 185-191 ◽  
Author(s):  
Ma Ángeles García-Monforte ◽  
Miguel Baya ◽  
Daniel Joven-Sancho ◽  
Irene Ara ◽  
Antonio Martín ◽  
...  
Keyword(s):  
Lewis Acidity ◽  
Derivatives Of

Preparation and Properties of Group 13 (Ga, In, Tl) Heterometallic Single and Corner-Shared Double Cube Derivatives of [Mo3S4(H2O)9]4+and Related Studies

1998 ◽  
Vol 37 (17) ◽  
pp. 4328-4334 ◽  
Author(s):  
Rita Hernandez-Molina ◽  
Vladimir P. Fedin ◽  
Maxim N. Sokolov ◽  
David M. Saysell ◽  
A. Geoffrey Sykes
Keyword(s):  
Group 13 ◽  
Derivatives Of
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