Table 2. Experimental and Calculateda Lattice Constants and Metal–Oxygen Distances for Mg2(dobdc) with PBE, optB88-vdW, optB86b-vdW, vdW-DF2, rev-vdW-DF2, PBE-D2, PBE-D3, PBE-D3 BJ, and M06-L.
lattice constant
(Å) |
Mg–O distance
(Å) |
|||
---|---|---|---|---|
method | a | c | apical | basal |
exp (ND at 20 K)89 | 25.921(2) | 6.8625(8) | 2.08 | 2.01 |
PBE33 | 26.07 | 6.93 | 2.02 | 2.04 |
optB88-vdW | 26.03 | 6.91 | 2.03 | 2.04 |
optB86b-vdW | 26.01 | 6.90 | 2.02 | 2.03 |
vdW-DF2 | 26.21 | 6.95 | 2.04 | 2.05 |
rev-vdW-DF2 | 26.01 | 6.91 | 2.02 | 2.03 |
PBE-D2 | 26.01 | 6.88 | 2.01 | 2.03 |
PBE-D3 | 26.04 | 6.92 | 2.02 | 2.04 |
PBE-D3 BJ | 26.03 | 6.91 | 2.02 | 2.04 |
M06-L | 25.78 | 6.83 | 1.99 | 2.01 |
The primitive cell used for the calculations was converted to a conventional cell to compare with experiment. The basal Mg–O bond distances are the average of all four basal Mg–O bonds.