National Institute of Standards and Technology
Computational Chemistry Comparison and Benchmark DataBase
Release 22May 2022
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 C2N2 (Cyanogen)

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 PM3 ov
composite G1 e
G2MP2 e
G2 e
G3 e
G3B3 e
G3MP2 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 cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pV(T+d)Z daug-cc-pVTZ
hartree fock HF ov ov ov ov ov ov ov ov ov ov ov ov 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 ov   ov  
BLYP ov ov ov ov ov ov 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 ov   ov  
B3LYP ov ov ov ov ov ov ov ov ov ov ov ov o ov ov ov ov ov ov  
B3LYPultrafine   ov     ov ov ov ov       ov ov ov   ov ov      
B3PW91 ov ov ov ov ov ov ov ov ov ov   ov ov ov   ov ov   ov  
mPW1PW91 ov ov ov ov ov ov ov ov ov ov   ov ov ov   ov ov   ov  
M06-2X ov ov ov ov ov ov ov ov ov ov ov ov ov ov   ov ov      
PBEPBE ov ov ov ov ov ov ov ov ov ov ov ov ov ov   ov ov   ov  
PBEPBEultrafine   ov     ov ov ov ov       ov ov ov   ov ov      
PBE1PBE ov ov ov ov ov ov ov ov ov ov   ov ov ov   ov ov      
HSEh1PBE ov ov ov ov ov ov ov ov ov ov   ov ov ov   ov ov      
TPSSh ov ov ov ov ov ov ov ov ov ov   ov ov ov ov ov ov ov    
wB97X-D ov ov ov ov ov ov ov ov ov ov   ov ov ov ov ov ov ov    
B97D3   ov     ov   ov   ov   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 cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pV(T+d)Z daug-cc-pVTZ
Moller Plesset perturbation MP2 ov ov ov ov ov ov ov ov ov ov   ov ov ov ov ov ov ov ov  
MP2=FULL ov ov ov ov ov ov ov ov ov ov   ov ov ov ov ov ov ov    
MP3         ov   ov         ov ov ov            
MP3=FULL   ov ov ov ov ov ov ov ov ov   ov ov ov   ov ov      
MP4   ov     ov       ov     ov ov ov   ov ov      
MP4=FULL   ov     ov       ov       ov ov   ov ov      
B2PLYP ov ov ov ov ov ov ov ov ov ov   ov ov ov   ov ov      
B2PLYP=FULL ov ov ov ov ov ov ov ov ov ov   ov ov ov   ov ov      
B2PLYP=FULLultrafine ov ov ov ov ov ov ov ov ov ov   ov ov ov   ov ov      
Configuration interaction CID   ov ov ov ov     ov                        
CISD   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 cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pV(T+d)Z daug-cc-pVTZ
Quadratic configuration interaction QCISD   ov ov ov ov ov ov ov ov ov   ov ov ov   ov ov      
QCISD(T)         ov     ov       ov ov ov   ov ov      
QCISD(T)=FULL         ov   ov           ov ov ov ov ov ov    
QCISD(TQ)         ov   ov           ov ov dnf ov dnf dnf    
QCISD(TQ)=FULL         ov                   dnf ov dnf      
Coupled Cluster CCD   ov ov ov ov ov ov ov ov ov   ov ov ov   ov ov      
CCSD         ov         ov   ov ov ov ov ov ov dnf    
CCSD=FULL         ov         ov   ov ov ov ov ov ov dnf    
CCSD(T)         ov ov   ov       ov ov ov ov ov ov ov ov  
CCSD(T)=FULL         ov             ov ov 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 cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pV(T+d)Z daug-cc-pVTZ

Methods with effective core potentials (select basis sets)
CEP-31G CEP-31G* CEP-121G CEP-121G* LANL2DZ SDD cc-pVTZ-PP aug-cc-pVTZ-PP Def2TZVPP
hartree fock HF ov ov ov ov ov ov     ov
density functional B1B95 ov ov              
B3LYP ov ov ov ov ov ov     ov
PBEPBE                 ov
wB97X-D ov ov ov ov ov ov      
Moller Plesset perturbation MP2 ov 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 e     e
CCSD(T)// HF/6-31G*   e e     e
CCSD// B3LYP/6-31G* e e        
CCSD(T)// B3LYP/6-31G* e e        
CCSD(T)//B3LYP/6-31G(2df,p)     e     e
CCSD// MP2FC/6-31G* e e e e e e
CCSD(T)// MP2FC/6-31G* e e e 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.