A method for population and bonding analyses in calculations with extended basis sets

1997 ◽  
Vol 95 (3-4) ◽  
pp. 81-95 ◽  
Author(s):  
Wenjian Liu ◽  
Lemin Li
Keyword(s):  
Basis Sets ◽  
Extended Basis

Net charges and valence AO's in the methylamines; the hydrogen basis set and the properties of nitrogen

1985 ◽  
Vol 63 (7) ◽  
pp. 1487-1491 ◽  
Author(s):  
Giuseppe Del Re ◽  
Sándor Fliszár ◽  
Michel Comeau ◽  
Claude Mijoule
Keyword(s):  
Basis Set ◽  
Basis Sets ◽  
Methyl Groups ◽  
Extended Form ◽  
Amine Nitrogen ◽  
Methyl Group ◽  
Net Charges ◽  
Extended Basis

Net charges and valence AO's for ammonia, methylamine, dimethylamine, and trimethylamine were calculated using extended basis sets. Superposition effects, evaluated by replacing Pople's standard 6-31G* basis by an extended form in which the basis of the ammonia H atoms and of the methyl groups of trimethylamine are retained in the treatment of each molecule, indicate that the quality of the treatment of amine nitrogen atoms is strongly dependent on the number of methyl groups. A new, augmented basis is proposed for the hydrogens, which appears to be reasonably well balanced: comparison with familiar (e.g., 6-31G*) calculations illustrates in what manner the treatment of nitrogen is worsened when even just one methyl group is replaced by hydrogen unless the impoverishment of the basis is suitably taken care of.

Ab initio MP2 study of the HF ... ClF complex using various extended basis sets and bond functions

1996 ◽  
Vol 93 (6) ◽  
pp. 333-342
Author(s):  
Josefredo R. Pliego ◽  
Stella M. Resende ◽  
Wagner B. Almeida
Keyword(s):  
Ab Initio ◽  
Basis Sets ◽  
Bond Functions ◽  
Extended Basis

Ab initio molecular orbital study of simple 1,3-dipolar reactions

1976 ◽  
Vol 29 (3) ◽  
pp. 465 ◽  
Author(s):  
D Poppinger
Keyword(s):  
Transition State ◽  
Ab Initio ◽  
Molecular Orbital ◽  
Transition States ◽  
Basis Sets ◽  
Molecular Orbital Calculations ◽  
Molecular Orbital Study ◽  
Orbital Study ◽  
Extended Basis ◽  
Optimized Geometries

Ab initio molecular orbital calculations with minimal and extended basis sets have been carried out for the 1,3-dipolar addition of fulminic acid to acetylene, ethylene, ethynamine and propynenitrile. Optimized geometries are reported for the transition states HCNO+C2H2, HCNO+C2H4, HCNO+ C2HNH2, for the adducts isoxazole and 2-isoxazoline, and for nitrosocyclopropene as a possible intermediate. The calculations indicate that (a) these 1,3-dipolar reactions are synchronous processes, (b) the geometry of the transition state is insensitive to substitution and (c) of the isomeric substituted adducts, 5-aminoisoxazole and isoxazole-4-carbonitrile should be formed preferentially.

GF calculation with minimal and extended basis sets for H2O, NH3, CH4 and H2O2

1969 ◽  
Vol 13 (1) ◽  
pp. 46-55 ◽  
Author(s):  
Pier Filippo Franchini ◽  
Claudio Vergani
Keyword(s):  
Basis Sets ◽  
Extended Basis

An ab initio investigation of disiloxane using extended basis sets and electron correlation

1992 ◽  
Vol 96 (20) ◽  
pp. 7958-7965 ◽  
Author(s):  
John B. Nicholas ◽  
Randall E. Winans ◽  
Robert J. Harrison ◽  
Lennox E. Iton ◽  
Larry A. Curtiss ◽  
...  
Keyword(s):  
Ab Initio ◽  
Electron Correlation ◽  
Basis Sets ◽  
Extended Basis
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