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Comparison of levels of theory for Mg-Br


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 2.1216
1
PM3 2.3716
1
PM6 2.3584
1
composite G2 2.3420
1
G3 2.3670
1
G3B3 2.3675
1
G4 2.3562
1
CBS-Q 2.3444
1

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 daug-cc-pVDZ daug-cc-pVTZ
hartree fock HF 2.2176
1
2.4052
1
2.3169
1
2.3955
1
  2.3420
1
2.3522
1
2.3612
1
2.3612
1
2.3370
1
2.3551
1
2.3734
1
2.3636
1
2.3572
1
2.3566
1
2.3726
1
2.3582
1
2.3567
1
2.3714
1
2.3580
1
density functional BLYP 2.2320
1
2.4088
1
2.3203
1
2.4039
1
2.3564
1
2.3562
1
2.3704
1
2.3793
1
2.3791
1
2.3495
1
2.3719
1
2.3932
1
2.3792
1
2.3728
1
  2.3897
1
2.3741
1
  2.3882
1
2.3739
1
B1B95 2.2157
1
2.3039
1
2.3039
1
2.3836
1
2.3327
1
2.3327
1
2.3421
1
2.3509
1
2.3507
1
2.3259
1
2.3436
1
2.3641
1
2.3553
1
2.3449
1
  2.3629
1
2.3457
1
  2.3614
1
2.3455
1
B3LYP 2.2226
1
2.3963
1
2.3084
1
2.3904
1
2.3410
1
2.3409
1
2.3530
1
2.3619
1
2.3619
1
2.3343
1
2.3544
1
2.3749
1
2.3630
1
2.3557
1
2.3552
1
2.3721
1
2.3567
1
2.3547
1
2.3706
1
2.3565
1
B3LYPultrafine   2.3963
1
    2.3410
1
2.3409
1
2.3530
1
2.3619
1
  2.3343
1
2.3544
1
2.3749
1
2.3630
1
2.3557
1
  2.3721
1
2.3567
1
  2.3706
1
2.3565
1
B3PW91 2.2200
1
2.4008
1
2.3115
1
2.3899
1
2.3390
1
2.3389
1
2.3488
1
2.3571
1
2.3577
1
2.3319
1
2.3494
1
2.3706
1
2.3616
1
2.3508
1
  2.3692
1
2.3517
1
  2.3675
1
2.3517
1
mPW1PW91 2.2174
1
2.3977
1
2.3089
1
2.3869
1
2.3356
1
2.3355
1
2.3451
1
2.3533
1
2.3532
1
2.3284
1
2.3457
1
2.3659
1
2.3580
1
2.3473
1
  2.3657
1
2.3482
1
  2.3641
1
2.3481
1
M06-2X 2.2125
1
2.3914
1
2.3056
1
2.3763
1
2.3280
1
2.3279
1
2.3376
1
2.3453
1
2.3453
1
2.3236
1
2.3395
1
2.3596
1
2.3505
1
2.3416
1
  2.3578
1
2.3422
1
  2.3564
1
2.3421
1
PBEPBE 2.2247
1
2.4063
1
2.3173
1
2.3976
1
2.3480
1
2.3478
1
2.3602
1
2.3675
1
2.3676
1
2.3403
1
2.3600
1
2.3813
1
2.3714
1
2.3614
1
  2.3802
1
2.3625
1
  2.3785
1
2.3623
1
PBEPBEultrafine   2.4063
1
    2.3480
1
2.3478
1
2.3602
1
2.3675
1
  2.3403
1
2.3600
1
2.3813
1
2.3714
1
2.3614
1
  2.3802
1
2.3625
1
  2.3785
1
2.3623
1
PBE1PBE 2.2164
1
2.3072
1
2.3072
1
2.3860
1
2.3344
1
2.3344
1
2.3437
1
2.3523
1
2.3522
1
2.3271
1
2.3447
1
2.3655
1
2.3569
1
2.3464
1
  2.3645
1
2.3472
1
  2.3629
1
2.3471
1
HSEh1PBE 2.2165
1
2.3970
1
2.3085
1
2.3876
1
2.3363
1
2.3362
1
2.3460
1
2.3550
1
2.3552
1
2.3290
1
2.3470
1
2.3683
1
2.3589
1
2.3489
1
  2.3667
1
2.3497
1
  2.3652
1
2.3496
1
TPSSh 2.2213
1
2.4050
1
2.3160
1
2.3946
1
2.3434
1
2.3433
1
2.3535
1
2.3613
1
2.3615
1
2.3357
1
2.3539
1
2.3752
1
2.3663
1
2.3550
1
2.3550
1
2.3738
1
2.3559
1
2.3549
1
2.3722
1
2.3559
1
wB97X-D 2.2147
1
2.4068
1
2.3164
1
2.3853
1
2.3343
1
2.3342
1
2.3451
1
2.3540
1
2.3537
1
2.3279
1
2.3458
1
2.3661
1
2.3573
1
2.3486
1
2.3472
1
2.3662
1
2.3495
1
  2.3648
1
2.3492
1
B97D3 2.2359
1
2.4191
1
2.3274
1
2.4063
1
2.3576
1
2.3574
1
2.3705
1
2.3813
1
2.3812
1
2.3520
1
2.3740
1
2.3954
1
2.3808
1
2.3748
1
2.3747
1
2.3913
1
2.3762
1
2.3744
1
2.3900
1
2.3760
1
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 daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2 2.2178
1
2.4106
1
2.3169
1
2.4035
1
2.3501
1
2.3494
1
2.3608
1
2.3567
1
2.3557
1
2.3391
1
2.3585
1
2.3747
1
2.3612
1
  2.3459
1
2.3785
1
2.3525
1
2.3489
1
2.3767
1
2.3517
1
MP2=FULL 2.2183
1
2.4105
1
2.3138
1
2.4022
1
2.3436
1
2.3428
1
2.3535
1
2.3514
1
2.3506
1
2.3170
1
2.3410
1
2.3751
1
2.3583
1
2.3260
1
2.3288
1
2.3764
1
2.3269
1
2.3249
1
2.3742
1
2.3269
1
MP3         2.3490
1
  2.3597
1
      2.3567
1
2.3752
1
2.3599
1
2.3488
1
        2.3753
1
2.3503
1
MP4   2.4141
1
    2.3506
1
      2.3574
1
  2.3594
1
2.3781
1
2.3616
1
2.3513
1
  2.3794
1
2.3541
1
  2.3775
1
2.3532
1
MP4=FULL   2.4141
1
    2.3449
1
      2.3526
1
  2.3440
1
  2.3589
1
2.3254
1
  2.3776
1
2.3285
1
  2.3753
1
2.3286
1
B2PLYP 2.2190
1
2.3980
1
2.3084
1
2.3919
1
2.3407
1
2.3404
1
2.3521
1
2.3566
1
2.3562
1
2.3329
1
2.3524
1
2.3711
1
2.3588
1
2.3505
1
  2.3709
1
2.3526
1
  2.3689
1
2.3527
1
B2PLYP=FULL 2.2190
1
2.3980
1
2.3075
1
2.3915
1
2.3386
1
2.3383
1
2.3498
1
2.3550
1
2.3546
1
2.3260
1
2.3472
1
2.3713
1
2.3579
1
2.3431
1
  2.3702
1
2.3444
1
  2.3698
1
2.3445
1
B2PLYP=FULLultrafine 2.2190
1
2.3980
1
2.3075
1
2.3915
1
2.3386
1
2.3383
1
2.3498
1
2.3550
1
2.3546
1
2.3260
1
2.3472
1
2.3713
1
2.3579
1
2.3431
1
  2.3702
1
2.3444
1
  2.3698
1
2.3444
1
Configuration interaction CID   2.4094
1
2.3147
1
2.4021
1
2.3457
1
    2.3548
1
    2.3519
1
  2.3589
1
2.3453
1
        2.3704
1
 
CISD   2.4101
1
2.3149
1
2.4028
1
2.3459
1
    2.3553
1
    2.3522
1
  2.3592
1
2.3456
1
        2.3707
1
2.3459
1
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 daug-cc-pVDZ daug-cc-pVTZ
Quadratic configuration interaction QCISD   2.4140
1
2.3172
1
2.4069
1
2.3500
1
2.3494
1
2.3608
1
2.3573
1
2.3563
1
2.3388
1
2.3575
1
2.3767
1
2.3617
1
2.3498
1
  2.3785
1
2.3519
1
  2.3766
1
2.3510
1
QCISD(T)         2.3509
1
    2.3585
1
    2.3593
1
2.3785
1
2.3622
1
2.3510
1
  2.3798
1
2.3541
1
  2.3774
1
2.3531
1
QCISD(T)=FULL         2.3447
1
  2.3548
1
      2.3443
1
  2.3595
1
2.3261
1
  2.3779
1
2.3290
1
  2.3760
1
2.3288
1
Coupled Cluster CCD   2.4119
1
2.3163
1
2.4051
1
2.3491
1
2.3483
1
2.3597
1
2.3560
1
2.3550
1
2.3377
1
2.3565
1
2.3758
1
2.3605
1
2.3489
1
  2.3771
1
2.3510
1
  2.3752
1
2.3501
1
CCSD         2.3497
1
2.3490
1
2.3604
1
2.3569
1
2.3560
1
2.3385
1
2.3572
1
2.3766
1
2.3614
1
2.3496
1
2.3456
1
2.3780
1
2.3517
1
  2.3761
1
2.3507
1
CCSD=FULL         2.3438
1
        2.3179
1
2.3429
1
2.3777
1
2.3589
1
2.3267
1
  2.3764
1
2.3269
1
  2.3740
1
2.3272
1
CCSD(T)         2.3507
1
2.3500
1
2.3615
1
2.3583
1
2.3578
1
2.3408
1
2.3594
1
2.3789
1
2.3619
1
2.3509
1
2.3492
1
2.3795
1
2.3538
1
2.3495
1
2.3774
1
2.3533
1
CCSD(T)=FULL         2.3445
1
          2.3441
1
2.3793
1
2.3592
1
2.3260
1
    2.3287
1
  2.3754
1
2.3296
1
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 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 2.4201
1
  2.4199
1
  2.4195
1
2.4172
1
    2.3573
1
density functional BLYP                 2.3722
1
B1B95                 2.3453
1
B3LYP 2.4324
1
  2.4326
1
  2.4296
1
2.4223
1
    2.3553
1
B3LYPultrafine                 2.3553
1
B3PW91                 2.3512
1
mPW1PW91                 2.3474
1
M06-2X                 2.3427
1
PBEPBE                 2.3614
1
PBEPBEultrafine                 2.3614
1
PBE1PBE                 2.3465
1
HSEh1PBE                 2.3489
1
TPSSh                 2.3550
1
wB97X-D 2.4203
1
  2.4206
1
  2.4189
1
2.4137
1
    2.3493
1
B97D3                 2.3752
1
Moller Plesset perturbation MP2 2.4367
1
  2.4353
1
  2.4241
1
2.4281
1
    2.3550
1
MP2=FULL                 2.3431
1
MP3                 2.3547
1
MP4                 2.3565
1
MP4=FULL                 2.3462
1
B2PLYP                 2.3521
1
B2PLYP=FULL                 2.3486
1
B2PLYP=FULLultrafine                 2.3486
1
Configuration interaction CID                 2.3494
1
CISD                 2.3497
1
Quadratic configuration interaction QCISD                 2.3552
1
QCISD(T)                 2.3564
1
QCISD(T)=FULL                 2.3463
1
Coupled Cluster CCD                 2.3543
1
CCSD                 2.3550
1
CCSD=FULL                 2.3456
1
CCSD(T)                 2.3565
1
CCSD(T)=FULL                 2.3461
1
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.