National Institute of Standards and Technology
Computational Chemistry Comparison and Benchmark DataBase
Release 17bSeptember 2015
NIST Standard Reference Database 101
IIntroduction
IIExperimental data
IIICalculated data
IVData comparisons
VCost comparisons
VIInput and output files
VIITutorials and Units
VIIILinks to other sites
IXFeedback
XOlder CCCBDB versions
XIIGeometries
XIII Vibrations
XIVReaction data
XVEntropy data
XVIBibliographic data
XVIIIon data
XVIIIBad calculations
XIXIndex of properties
XXH-bond dimers
XXIOddities

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III.F.2.

Completed calculations for CH2CH(CH3)2 (Isobutyl radical)

Methods and basis sets for which an energy has been calculated. "e" indicates just an energy has been calculated. "o" indicates an optimized geometry. "v" indicates vibrational frequencies. "s" followed by a number indicates completed calculations for different states (for example s1ov). "c" followed by a number indicates completed calculations for different conformations (for example c2ov).
See the Calculated Energies page (section III.A.1) for more calculated properties.
Methods with predefined basis sets
semi-empirical AM1 o
composite G3 e
G3B3 e
G4 e
CBS-Q e

Methods with standard basis sets
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z
hartree fock HF   ov ov ov ov ov ov ov   ov   ov ov ov ov   ov
ROHF   ov     ov ov ov ov         ov ov     ov
density functional LSDA ov ov ov ov ov ov ov ov ov ov     ov ov ov   ov
SVWN   ov     ov   ov         ov          
BLYP   ov ov ov ov ov ov ov         ov ov     ov
B1B95 ov ov ov ov ov ov ov ov ov ov     ov ov ov   ov
B3LYP   ov ov ov ov ov ov ov   ov   ov ov ov ov   ov
B3LYPultrafine                               ov  
B3PW91 ov ov ov ov ov ov ov   ov ov     ov o ov   o
mPW1PW91   ov     ov ov ov ov         ov ov     ov
M06-2X     o   o                        
PBEPBE                                 ov
PBE1PBE         ov                        
HSEh1PBE   ov     ov   ov             ov      
TPSSh         ov   ov     ov       ov      
wB97X-D     ov   ov       ov         ov   ov  
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z
Moller Plesset perturbation MP2 ov ov ov ov ov ov ov ov ov ov   ov o o ov   o
MP2=FULL   ov     ov ov ov ov ov       ov        
PMP2         o   o                    
MP3             o                    
MP3=FULL         ov   ov                    
B2PLYP         ov                 ov      
B2PLYP=FULLultrafine         ov                        
Configuration interaction CID         ov                        
CISD         ov                        
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z
Quadratic configuration interaction QCISD   ov     ov     ov                  
Coupled Cluster CCD         ov                        
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z

Methods with effective core potentials (select basis sets)
CEP-31G CEP-31G* CEP-121G CEP-121G* LANL2DZ SDD
hartree fock HF ov ov ov ov ov ov
density functional B1B95 ov ov        
B3LYP ov ov ov ov ov ov
Moller Plesset perturbation MP2 ov ov ov ov ov ov

Single point energy calculations (select basis sets)
6-311+G(3df,2p) cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z
Moller Plesset perturbation MP2FC// HF/6-31G* e e e e   e
MP2FC// B3LYP/6-31G* e e e e   e
MP2FC// MP2FC/6-31G* e e e e e e
MP4// HF/6-31G* e e e     e
MP4// B3LYP/6-31G*   e e     e
MP4// MP2/6-31G* e   e     e
Coupled Cluster CCSD// HF/6-31G*   e        
CCSD(T)// HF/6-31G*   e        
CCSD// B3LYP/6-31G* e e        
CCSD(T)// B3LYP/6-31G* e e        
CCSD// MP2FC/6-31G* e     e e  
CCSD(T)// MP2FC/6-31G* e     e e  
For descriptions of the methods (AM1, HF, MP2, ...) and basis sets (3-21G, 3-21G*, 6-31G, ...) see the glossary in section I.C. Predefined means the basis set used is determined by the method.