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All results from a given calculation for HCOOHH2O (Formic acid water dimer)

using model chemistry: MP2/6-31+G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A
Energy calculated at MP2/6-31+G**
 hartrees
Energy at 0K-265.526085
Energy at 298.15K-265.530818
HF Energy-264.817753
Counterpoise corrected energy-265.522696
CP Energy at 298.15K-265.527208
Counterpoise optimized geometry corrected energy 
CP opt. Energy at 298.15K 
Nuclear repulsion energy123.083743
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 MP2/6-31+G**
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 3969 3733 124.92      
2 A 3776 3551 112.10      
3 A 3485 3278 578.22      
4 A 3188 2999 60.10      
5 A 1775 1670 329.62      
6 A 1625 1529 170.25      
7 A 1462 1375 0.59      
8 A 1397 1314 14.69      
9 A 1220 1148 251.40      
10 A 1080 1016 16.41      
11 A 915 860 164.04      
12 A 684 643 41.94      
13 A 544 512 153.69      
14 A 359 338 95.27      
15 A 253 238 126.73      
16 A 214 201 14.90      
17 A 180 169 50.23      
18 A 161 151 13.05      

Unscaled Zero Point Vibrational Energy (zpe) 13142.8 cm-1
Scaled (by 0.9406) Zero Point Vibrational Energy (zpe) 12362.2 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 MP2/6-31+G**
ABC
0.38644 0.16261 0.11501

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31+G**

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.388 0.969 0.003
O2 -0.586 1.141 0.007
O3 1.906 0.004 -0.081
C4 -1.216 -0.038 0.006
O5 -0.679 -1.140 0.005
H6 -2.298 0.104 0.008
H7 2.659 -0.057 0.517
H8 1.415 -0.831 -0.013

Atom - Atom Distances (Å)
  H1 O2 O3 C4 O5 H6 H7 H8
H10.98831.80121.89372.36402.82212.54532.0727
O20.98832.74021.33682.28312.00243.49642.8090
O31.80122.74023.12362.82874.20670.96370.9715
C41.89371.33683.12361.22601.09183.90872.7477
O52.36402.28312.82871.22602.04193.54702.1168
H62.82212.00244.20671.09182.04194.98643.8291
H72.54533.49640.96373.90873.54704.98641.5583
H82.07272.80900.97152.74772.11683.82911.5583

picture of Formic acid water dimer state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H1 O2 C4 108.130 H1 O3 H7 131.612
H1 O3 H8 91.773 O2 H1 O3 157.445
O2 C4 O5 125.907 O2 C4 H6 110.674
O5 C4 H6 123.419 H7 O3 H8 107.271
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at MP2/6-31+G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.482      
2 O -0.590      
3 O -0.822      
4 C 0.584      
5 O -0.616      
6 H 0.142      
7 H 0.388      
8 H 0.431      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.687 0.220 1.266 1.457
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -15.513 -2.094 3.685
y -2.094 -28.711 -0.074
z 3.685 -0.074 -23.926
Traceless
 xyz
x 10.805 -2.094 3.685
y -2.094 -8.991 -0.074
z 3.685 -0.074 -1.814
Polar
3z2-r2-3.628
x2-y213.198
xy-2.094
xz3.685
yz-0.074


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.845 -0.101 0.163
y -0.101 2.910 -0.163
z 0.163 -0.163 4.731


<r2> (average value of r2) Å2
<r2> 0.000
(<r2>)1/2 0.000