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Geometry Comparison

CaBr (Calcium monobromide)


distance is atom 1 (Ca) to atom 2 (Br)

Experimental bond length is 2.594  Å

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Calculated bond length in Å
Methods with predefined basis sets
semi-empirical PM3 2.785
PM6 2.587
composite G2 2.715
G3 2.682
G3B3 2.603
G4 2.599
CBS-Q 2.709

Calculated bond length in Å
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
hartree fock HF 2.714 2.852 2.712 2.825 2.715 2.715 2.734 2.681 2.681 2.693 2.675 2.801 2.684 2.674 2.671
ROHF   2.852 2.712 2.825 2.715 2.715 2.734 2.681 2.681   2.675 2.801 2.684 2.674 2.671
density functional BLYP 2.730 2.872 2.712 2.834 2.716 2.716 2.739 2.614 2.614 2.675 2.608 2.825 2.607 2.605  
B1B95 2.708 2.686 2.686 2.803 2.683 2.683 dnf 2.596 2.596 2.648 2.589 2.785 2.595 2.588  
B3LYP 2.716 2.851 2.697 2.816 2.699 2.699 2.721 2.613 2.613 2.662 2.606 2.802 2.606 2.603 2.602
B3LYPultrafine   2.851     2.699 2.699 2.720 2.613   2.663 2.606 2.802 2.607 2.604  
B3PW91 2.711 2.844 2.690 2.809 2.689 2.689 2.707 2.600 2.600 2.653 2.591 2.788 2.597 2.589  
mPW1PW91 2.707 2.837 2.686 2.804 2.685 2.685 2.703 2.599 2.599 2.650 2.590 2.781 2.597 2.588  
M06-2X 2.689 2.823 2.684 2.794 2.686 2.686 2.702 2.625 2.625 2.660 2.621 2.780 2.623 2.620  
PBEPBE 2.718 2.855 2.696 2.818 2.696 2.696 2.716 2.591 2.591 2.656 2.583 2.801 2.589 2.580  
PBEPBEultrafine   2.855     2.696 2.696 2.716 2.591   2.656 2.583 2.801 2.589 2.581  
PBE1PBE 2.705 2.684 2.684 2.803 2.684 2.684 2.702 2.597 2.597 2.649 2.589 2.780 2.596 2.587  
HSEh1PBE 2.706 2.839 2.686 2.805 2.685 2.685 2.704 2.599 2.599 2.650 2.591 2.784 2.597 2.589  
TPSSh 2.711 2.843 2.693 2.811 2.693 2.693 2.709 2.599 2.599 2.656 2.591 2.788 2.599 2.589 2.587
wB97X-D 2.710 2.833 2.688 2.801 2.687 2.687 2.706 2.612 2.612 2.655 2.604 2.781 2.610 2.602 2.600
B97D3 2.736 2.879 2.717 2.844 2.728 2.728 dnf dnf 2.618 2.687 2.596 2.833 2.602 2.592 2.591
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
Moller Plesset perturbation MP2 2.717 2.865 2.717 2.838 2.711 2.711 2.730 2.640 2.640 2.676 2.632 2.802 2.679 2.665 2.662
MP2=FULL 2.719 2.866 2.712 2.838 2.708 2.708 2.726 2.635 2.635 2.669 2.624 2.798 2.646 2.625 2.603
MP3         2.712   2.730       2.644 2.802 2.679 2.667  
MP3=FULL   2.866 2.712 2.839 2.709 2.709 2.727 2.644 2.644 2.674 2.638 2.798 2.650 2.637  
B2PLYP 2.713 2.852 2.701 2.819 2.700 2.700 2.720 2.624 2.624 2.666 2.617 2.797 2.633 2.627  
B2PLYP=FULL 2.714 2.852 2.699 2.819 2.699 2.699 2.719 2.623 2.623 2.663 2.614 2.796 2.622 2.614  
B2PLYP=FULLultrafine 2.714 2.852 2.699 2.819 2.699 2.699 2.719 2.623 2.623 2.663 2.615 2.796 2.622 2.614  
Configuration interaction CID   2.865 2.716 2.839 2.712     2.652     2.645   2.680 2.667  
CISD   2.868 2.716 2.840 2.712     2.652     2.644   2.680 2.667  
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
Quadratic configuration interaction QCISD   2.870 2.718 2.842 2.712 2.712 2.731 2.649 2.649 2.681 2.644 2.803 2.680 2.667  
QCISD(T)=FULL                         dnf    
Coupled Cluster CCD   2.866 2.717 2.840 2.712 2.712 2.731 2.649 2.649 2.680 2.645 2.802 2.680 2.668  
CCSD         2.712 2.712 2.731 2.649 2.649 2.680 2.644 2.803 2.680 2.667 2.662
CCSD=FULL         2.709         2.674 2.638 2.799 2.651 2.637 2.616
CCSD(T)=FULL                       dnf dnf    
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

Calculated bond length in Å
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 2.821   2.821   2.866 2.730     2.676
ROHF                 2.676
density functional BLYP                 2.614
B1B95                 2.595
B3LYP 2.828   2.828   2.860 2.654     2.612
B3LYPultrafine                 2.612
B3PW91                 2.598
mPW1PW91                 2.597
M06-2X                 2.625
PBEPBE                 2.590
PBEPBEultrafine                 2.590
PBE1PBE                 2.595
HSEh1PBE                 2.597
TPSSh                 2.598
wB97X-D 2.824   2.824   2.844 2.660     2.611
B97D3                 dnf
Moller Plesset perturbation MP2 2.844   2.844   2.872 2.719     2.670
MP2=FULL                 2.633
MP3                 2.672
MP3=FULL                 2.644
B2PLYP                 2.633
B2PLYP=FULL                 2.622
B2PLYP=FULLultrafine                 2.622
Configuration interaction CID                 2.670
CISD                 2.670
Quadratic configuration interaction QCISD                 2.672
Coupled Cluster CCD                 2.672
CCSD                 2.672
CCSD=FULL                 2.644
Values that are outliers may reflect incorrect atom numbering for different levels of theory.
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