return to home page

IV.D.7. (XVIII.A.2.)

Bad Calculated Bond Lengths

List of molecules with calculated bond lengths that differ by more than 0.050 Å from experimental bond lengths.

Calculated at MP2FU/cc-pVTZ

Species Name Bond type Bond Length (Å)
Experimental Calculated Difference
C2H5NO3 Nitric acid, ethyl ester rCO 1.430 2.334 0.904
Be2 Beryllium diatomic rBeBe 2.460 1.999 -0.461
C4H6O2 2,3-Butanedione rCH 1.114 1.527 0.413
CH2ClCH2CH3 Propane, 1-chloro- rCH 1.113 1.518 0.405
CH2ClCH2CH3 Propane, 1-chloro- rCH 1.113 1.515 0.402
C4H8O2 1,3-Dioxane rCH 1.095 1.398 0.303
Al2 Aluminum diatomic rAlAl 2.701 2.975 0.274
Al2 Aluminum diatomic rAlAl 2.701 2.453 -0.248
B2 Boron diatomic rBB 1.590 1.375 -0.215
Si2 Silicon diatomic rSiSi 2.246 2.066 -0.180
AlN Aluminum nitride rNAl 1.786 1.634 -0.152
NO3 Nitrogen trioxide rNO 1.238 1.370 0.132
Ne2 Neon dimer rNeNe 3.100 2.977 -0.123
ClF+ clorine monofluoride cation rFCl 1.448 1.527 0.079
NS Mononitrogen monosulfide rNS 1.497 1.420 -0.078
B2 Boron diatomic rBB 1.590 1.513 -0.077
SO+ sulfur monoxide cation rOS 1.424 1.349 -0.075
CO Carbon monoxide rCO 1.206 1.135 -0.070
CO Carbon monoxide rCO 1.206 1.135 -0.070
C2 Carbon diatomic rCC 1.243 1.311 0.069
ONNO NO dimer rNN 2.236 2.174 -0.063
HCF Fluoromethylene rCH 1.138 1.076 -0.062
Na2+ sodium dimer cation rNaNa 3.540 3.597 0.057
C3H8O2 1,3-Propanediol rCH 1.140 1.087 -0.053
C6H6 Fulvene rCH 1.130 1.078 -0.052
25 molecules.