return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for H2OHCOOH (Water formic acid dimer 2)

using model chemistry: PBE1PBE/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A
Energy calculated at PBE1PBE/6-31G*
 hartrees
Energy at 0K-265.889031
Energy at 298.15K-265.893338
HF Energy-265.889031
Nuclear repulsion energy118.361299
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at PBE1PBE/6-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A 3883 3690 70.33      
2 A 3728 3543 6.23      
3 A 3723 3538 192.69      
4 A 3157 3000 14.43      
5 A 1854 1761 357.20      
6 A 1743 1656 73.52      
7 A 1415 1345 5.36      
8 A 1358 1290 19.63      
9 A 1190 1131 216.30      
10 A 1096 1042 1.79      
11 A 730 693 163.36      
12 A 648 616 21.68      
13 A 609 579 375.41      
14 A 292 278 97.06      
15 A 219 208 108.77      
16 A 187 178 1.50      
17 A 111 105 15.40      
18 A 104 99 11.28      

Unscaled Zero Point Vibrational Energy (zpe) 13023.1 cm-1
Scaled (by 0.9503) Zero Point Vibrational Energy (zpe) 12375.8 cm-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.
Rotational Constants (cm-1) from geometry optimized at PBE1PBE/6-31G*
ABC
0.76692 0.09749 0.08716

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBE1PBE/6-31G*

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 -1.726 0.429 -0.139
O2 -2.368 -0.299 -0.091
O3 0.196 0.951 0.001
H4 -2.761 -0.202 0.784
C5 0.644 -0.172 -0.002
O6 1.943 -0.464 0.011
H7 0.030 -1.081 -0.017
H8 2.423 0.384 0.018

Atom - Atom Distances (Å)
  H1 O2 O3 H4 C5 O6 H7 H8
H10.97171.99681.52322.44933.77902.31964.1529
O20.97172.85360.96463.01564.31462.52304.8406
O31.99682.85363.26841.20912.24762.03852.2985
H41.52320.96463.26843.49454.77373.03375.2728
C52.44933.01561.20913.49451.33101.09671.8642
O63.77904.31462.24764.77371.33102.00980.9742
H72.31962.52302.03853.03371.09672.00982.8059
H84.15294.84062.29855.27281.86420.97422.8059

picture of Water formic acid dimer 2 state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H1 O2 H4 103.741 H1 O3 C5 96.543
O2 H1 O3 145.865 O3 C5 O6 124.401
O3 C5 H7 124.206 C5 O6 H8 106.916
O6 C5 H7 111.393
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBE1PBE/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.427      
2 O -0.837      
3 O -0.448      
4 H 0.397      
5 C 0.361      
6 O -0.531      
7 H 0.203      
8 H 0.429      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  1.992 0.450 1.456 2.508
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -21.469 0.893 -4.491
y 0.893 -25.132 -0.452
z -4.491 -0.452 -22.167
Traceless
 xyz
x 2.181 0.893 -4.491
y 0.893 -3.315 -0.452
z -4.491 -0.452 1.134
Polar
3z2-r22.268
x2-y23.663
xy0.893
xz-4.491
yz-0.452


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.441 -0.074 -0.203
y -0.074 3.405 0.020
z -0.203 0.020 2.100


<r2> (average value of r2) Å2
<r2> 120.712
(<r2>)1/2 10.987