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Comparison of levels of theory for Li-F


Click on an entry for a histogram of the values.
The subscript refers to how many bonds of that type have been calculated.
average calculated bond lengths (Å)
Methods with predefined basis sets
semi-empirical AM1 1.8372
6
PM3 1.7617
7
PM6 1.8754
7
composite G2 1.7404
6
G3 1.7404
6
G3B3 1.7386
6
G3MP2 1.7997
2
G4 1.7288
7
CBS-Q 1.7522
6

average calculated bond lengths (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 aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pCVDZ cc-pCVTZ aug-cc-pCVTZ daug-cc-pVDZ daug-cc-pVTZ
hartree fock HF 1.6078
6
1.7088
6
1.7088
6
1.7625
6
1.7212
7
1.7400
6
1.7554
6
1.7503
6
1.7503
6
1.7408
6
1.7425
6
1.7641
7
1.7689
6
1.7499
6
1.7353
6
1.7515
6
1.7432
6
1.7348
6
1.5660
1
1.5581
1
  1.7497
6
1.7222
7
ROHF 1.8530
1
1.9969
1
1.9969
1
2.1143
1
2.0444
1
2.0444
1
2.0739
1
2.0760
1
2.0760
1
2.0172
1
2.0357
1
2.1494
1
2.1100
1
2.0653
1
2.0258
1
2.0499
1
2.0444
1
2.0219
1
      2.0452
1
2.0362
1
density functional LSDA 1.6364
2
1.7342
2
1.7342
2
1.8020
2
1.7636
2
1.7636
2
1.8083
2
1.7776
2
1.7776
2
1.7609
2
  1.5892
1
1.8047
2
1.7874
2
1.9757
1
1.7896
2
1.7781
2
1.9716
1
1.5535
1
1.5502
1
     
BLYP 1.6433
6
1.7318
6
1.7318
6
1.7738
6
1.6985
7
1.7518
6
1.7887
6
1.7627
6
1.7627
6
1.7582
6
1.7707
6
1.8099
6
1.7775
6
1.7720
6
  1.7820
6
1.7706
6
  1.5724
1
1.5749
1
  1.7784
6
1.7680
6
B1B95 1.6322
6
1.7212
6
1.7212
6
1.7667
6
1.7457
6
1.7460
6
1.8558
2
1.7561
6
1.7560
6
1.7504
6
1.7252
4
1.8020
6
1.7736
6
1.7629
6
2.0475
1
1.7656
6
1.5656
1
2.0444
1
1.5671
1
1.5652
1
  1.7987
5
1.6939
5
B3LYP 1.6280
6
1.7158
6
1.7158
6
1.7603
6
1.7390
6
1.7390
6
1.7692
6
1.7494
6
1.7494
6
1.7444
6
1.7525
6
1.7738
7
1.7663
6
1.7559
6
1.7437
6
1.7632
6
1.7529
6
1.7442
6
1.5635
1
1.5633
1
  1.7598
6
1.7504
6
B3LYPultrafine   1.7157
6
    1.7390
6
1.7391
6
1.7693
6
1.7494
6
  1.7445
6
1.7525
6
1.7934
6
1.7664
6
1.7558
6
  1.7632
6
1.7333
7
  1.5635
1
1.5633
1
  1.7598
6
1.7504
6
B3PW91 1.6353
6
1.7256
6
1.7256
6
1.7725
6
1.7505
6
1.7505
6
1.7792
6
1.7608
6
1.7608
6
1.7543
6
1.7617
6
1.8063
6
1.7795
6
1.7667
6
  1.7731
6
1.7619
6
  1.5698
1
1.5671
1
  1.7700
6
1.7596
6
mPW1PW91 1.6306
6
1.7192
6
1.7192
6
1.7663
6
1.7445
6
1.7445
6
1.7707
6
1.7544
6
1.7544
6
1.7479
6
1.7547
6
1.7976
6
1.7734
6
1.7597
6
  1.7655
6
1.7551
6
  1.5667
1
1.5633
1
  1.7624
6
1.7525
6
M06-2X 1.6162
6
1.7081
6
1.6878
7
1.7549
6
1.7138
7
1.7336
6
1.7560
6
1.7441
6
1.7441
6
1.7364
6
1.7220
7
1.7874
6
1.7616
6
1.7496
6
  1.7511
6
1.7437
6
  1.5622
1
1.5612
1
  1.7489
6
1.7416
6
PBEPBE 1.6451
6
1.7324
6
1.7323
6
1.7750
6
1.7527
6
1.7527
6
1.7861
6
1.7624
6
1.7624
6
1.7586
6
1.7681
6
1.8081
6
1.7798
6
1.7707
6
2.0406
1
1.7795
6
1.7686
6
2.0407
1
1.5747
1
1.5739
1
  1.7760
6
1.7659
6
PBEPBEultrafine   1.7323
6
    1.7530
6
1.7530
6
1.7864
6
1.7625
6
  1.7587
6
1.7681
6
1.8079
6
1.7800
6
1.7705
6
  1.7796
6
1.7684
6
  1.5747
1
1.5739
1
  1.7760
6
1.7659
6
PBE1PBE 1.6285
6
1.7163
6
1.7163
6
1.7622
6
1.7211
7
1.7408
6
1.7663
6
1.7501
6
1.7501
6
1.7447
6
1.7504
6
1.7925
6
1.7692
6
1.7553
6
  1.7609
6
1.7511
6
  1.5659
1
1.5622
1
  1.7581
6
1.7487
6
HSEh1PBE 1.6285
6
1.6945
7
1.7162
6
1.7618
6
1.7210
7
1.7406
6
1.7473
7
1.7501
6
1.7501
6
1.7447
6
1.7505
6
1.7930
6
1.7689
6
1.7373
7
  1.7608
6
1.7512
6
  1.5654
1
1.5626
1
  1.7582
6
1.7488
6
TPSSh 1.6373
6
1.7235
6
1.7235
6
1.7680
6
1.6928
7
1.7469
6
1.7092
7
1.7565
6
1.7566
6
1.7457
7
1.7570
6
1.8004
6
1.7753
6
1.7027
7
1.7476
6
1.7686
6
1.7578
6
1.7483
6
1.5693
1
1.5671
1
  1.7658
6
1.7553
6
wB97X-D 1.6384
6
1.7350
6
1.7296
7
1.7897
6
1.7613
7
1.7674
6
1.7942
7
1.7816
6
1.7744
7
1.7718
6
1.7836
6
1.8190
7
1.7918
7
1.7824
7
1.7707
6
1.7947
6
1.7796
7
1.7713
6
      1.7917
6
1.7813
6
B97D3 1.6620
6
1.7320
7
1.7537
6
1.8007
6
1.7573
7
1.7781
6
1.7920
7
1.7891
6
1.7677
7
1.7827
6
1.7737
7
1.8134
7
1.8056
6
1.7764
7
1.7841
6
1.8070
6
1.7741
7
1.7856
6
      1.8037
6
1.7926
6
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-pCVDZ cc-pCVTZ aug-cc-pCVTZ daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2 1.6183
6
1.7248
6
1.7248
6
1.7852
6
1.7539
7
1.7610
6
1.7925
6
1.7555
7
1.7626
6
1.7644
6
1.7724
6
1.7914
7
1.7904
6
1.7764
6
1.7658
6
1.7876
6
1.7774
6
1.7678
6
1.5801
1
1.5648
1
  1.7856
6
1.7752
6
MP2=FULL 1.6184
6
1.7244
6
1.7244
6
1.7840
6
1.7536
6
1.7541
6
1.7659
6
1.7566
6
1.7566
6
1.7511
6
1.7561
6
1.8100
6
1.7838
6
1.7603
6
1.7497
6
1.7540
6
1.7308
7
1.7418
6
1.5773
1
1.5590
1
  1.7554
6
1.7452
6
ROMP2 1.8417
1
1.9905
1
1.9905
1
2.1222
1
2.0505
1
2.0505
1
2.1066
1
2.0647
1
2.0647
1
2.0246
1
2.0600
1
2.1748
1
2.1161
1
2.0820
1
2.0507
1
2.0824
1
2.0708
1
2.0493
1
      2.0778
1
2.0638
1
MP3         1.7535
6
  1.7083
7
      1.7587
6
1.8008
6
1.7827
6
1.7638
6
        1.5739
1
1.5714
1
  1.7729
6
1.7603
6
MP3=FULL   1.7180
6
1.7180
6
1.7773
6
1.6925
7
1.7469
6
1.6920
7
1.7485
6
1.7485
6
1.7407
6
1.7425
6
1.7992
6
1.7759
6
1.7494
6
  1.7394
6
1.7387
6
  1.5711
1
1.5621
1
  1.7404
6
1.7295
6
MP4   1.7054
7
    1.7408
7
    1.5719
1
1.7421
7
  1.7727
6
1.8108
6
1.7902
6
1.7565
7
  1.7889
6
1.7779
6
  1.5825
1
1.5830
1
  1.7871
6
1.7756
6
MP4=FULL   1.7267
6
    1.7539
6
      1.7562
6
  1.7552
6
  1.7835
6
1.7597
6
  1.7504
6
1.7521
6
  1.5796
1
1.5734
1
  1.7525
6
1.7429
6
B2PLYP 1.6224
6
1.7141
6
1.7141
6
1.7641
6
1.7223
7
1.7419
6
1.7717
6
1.7497
6
1.7497
6
1.7468
6
1.7548
6
1.7939
6
1.7700
6
1.7018
7
  1.7664
6
1.7562
6
  1.5679
1
1.5679
1
  1.7643
6
1.7544
6
B2PLYP=FULL 1.6225
6
1.7140
6
1.7140
6
1.7638
6
1.7412
6
1.7397
6
1.7628
6
1.7479
6
1.7479
6
1.7431
6
1.7498
6
1.7934
6
1.7683
6
1.7538
6
  1.7561
6
1.7496
6
  1.5670
1
1.5651
1
  1.7536
6
1.7453
6
B2PLYP=FULLultrafine 1.6226
6
1.7140
6
1.7140
6
1.7638
6
1.7204
7
1.7398
6
1.7630
6
1.7479
6
1.7479
6
1.7431
6
1.7498
6
1.7933
6
1.7472
7
1.7358
7
  1.7561
6
1.7317
7
      1.5685
1
1.7536
6
1.7453
6
Configuration interaction CID   1.7182
6
1.7182
6
1.7779
6
1.7521
6
    1.7535
6
    1.7557
6
  1.7810
6
1.7616
6
        1.5744
1
1.5714
1
  1.7701
6
1.7570
6
CISD   1.7196
6
1.7196
6
1.7790
6
1.7530
6
    1.7543
6
    1.7568
6
  1.7819
6
1.7624
6
        1.5759
1
1.5725
1
  1.7716
6
1.7581
6
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-pCVDZ cc-pCVTZ aug-cc-pCVTZ daug-cc-pVDZ daug-cc-pVTZ
Quadratic configuration interaction QCISD   1.7232
6
1.7232
6
1.7836
6
1.7580
6
1.7580
6
1.7874
6
1.7589
6
1.7589
6
1.7594
6
1.7653
6
1.8066
6
1.7873
6
1.7697
6
  1.7822
6
1.7694
6
  1.5797
1
1.5772
1
  1.7801
6
1.7672
6
QCISD(T)         1.7582
6
    1.7599
6
    1.7681
6
1.8082
6
1.7878
6
1.7715
6
  1.7841
6
1.7729
6
  1.5800
1
1.5791
1
  1.7823
6
1.7707
6
QCISD(T)=FULL         1.7514
6
  1.7579
6
      1.7510
6
  1.7810
6
1.7563
6
1.7432
6
1.7465
6
1.7476
6
1.7340
6
1.5772
1
1.5696
1
  1.7479
6
1.7384
6
Coupled Cluster CCD   1.7200
6
1.7200
6
1.7805
6
1.7549
6
1.7554
6
1.7830
6
1.7566
6
1.7566
6
1.7566
6
1.7616
6
1.8038
6
1.7849
6
1.7672
6
  1.7782
6
1.7662
6
  1.5759
1
1.5743
1
  1.7759
6
1.7637
6
CCSD         1.7568
6
1.7568
6
1.7848
6
1.7581
6
1.7581
6
1.7580
6
1.7636
6
1.8054
6
1.7860
6
1.8298
2
1.7556
6
1.7804
6
1.7678
6
1.8103
2
1.5779
1
1.5757
1
  1.7781
6
1.7656
6
CCSD=FULL         1.7500
6
        1.7441
6
1.7469
6
1.8038
6
1.7794
6
1.7535
6
1.7392
6
1.7430
6
1.7430
6
1.7752
2
1.5752
1
1.5666
1
  1.7443
6
1.7782
2
CCSD(T)   1.5327
1
    1.7580
6
1.7581
6
1.7875
6
1.7600
6
1.7600
6
1.7607
6
1.7679
6
1.8078
6
1.7875
6
1.7710
6
1.7598
6
1.7835
6
1.7723
6
1.7620
6
1.5795
1
1.5786
1
  1.7816
6
1.7700
6
CCSD(T)=FULL         1.7106
7
          1.7505
6
1.8060
6
1.7807
6
1.7559
6
1.7245
7
1.7460
6
1.7472
6
1.7334
6
1.5767
1
1.5691
1
  1.7474
6
1.7378
6
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-pCVDZ cc-pCVTZ aug-cc-pCVTZ daug-cc-pVDZ daug-cc-pVTZ

average calculated bond lengths (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 1.8806
6
1.8471
6
1.7481
6
1.7232
6
1.8024
6
1.7985
6
    1.7428
7
ROHF                 2.0505
1
density functional BLYP                 1.7687
6
B1B95 1.6991
1
1.6719
1
            1.7553
6
B3LYP 1.8849
6
1.8577
6
1.7665
6
1.7461
6
1.7970
6
1.7955
6
    1.7499
7
B3LYPultrafine                 1.7515
6
B3PW91                 1.7615
6
mPW1PW91                 1.7539
6
M06-2X                 1.7455
6
PBEPBE                 1.7634
7
PBEPBEultrafine                 1.7662
6
PBE1PBE                 1.7498
6
HSEh1PBE                 1.7502
6
TPSSh                 1.7563
6
wB97X-D 1.8861
6
1.8574
6
1.7630
6
1.7412
6
1.8312
6
1.8292
6
    1.7848
6
B97D3                 1.7923
6
Moller Plesset perturbation MP2 1.9079
6
1.8772
6
1.7751
6
1.7519
6
1.8295
6
1.8251
6
    1.7688
7
MP2=FULL                 1.7632
6
ROMP2                 2.0751
1
MP3                 1.7595
6
MP3=FULL                 1.7506
6
MP4                 1.7705
6
MP4=FULL                 1.7606
6
B2PLYP                 1.7532
6
B2PLYP=FULL                 1.7505
6
B2PLYP=FULLultrafine                 1.7505
6
Configuration interaction CID                 1.7570
6
CISD                 1.7578
6
Quadratic configuration interaction QCISD                 1.7648
6
QCISD(T)                 1.7671
6
QCISD(T)=FULL                 1.7575
6
Coupled Cluster CCD                 1.7623
6
CCSD                 1.7635
6
CCSD=FULL                 1.7545
6
CCSD(T)                 1.7666
6
CCSD(T)=FULL                 1.7571
6
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.