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

using model chemistry: B1B95/6-31G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A
Energy calculated at B1B95/6-31G**
 hartrees
Energy at 0K-266.113835
Energy at 298.15K-266.118974
Nuclear repulsion energy125.112328
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 B1B95/6-31G**
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 3917 3740 75.34      
2 A 3696 3529 234.82      
3 A 3287 3138 649.29      
4 A 3086 2946 104.97      
5 A 1830 1747 329.46      
6 A 1672 1597 92.13      
7 A 1483 1416 3.85      
8 A 1409 1345 20.73      
9 A 1267 1209 190.72      
10 A 1082 1033 23.18      
11 A 998 953 122.65      
12 A 725 692 167.83      
13 A 673 643 163.68      
14 A 398 380 93.04      
15 A 318 304 69.28      
16 A 252 241 54.72      
17 A 215 205 7.51      
18 A 205 196 16.56      

Unscaled Zero Point Vibrational Energy (zpe) 13256.0 cm-1
Scaled (by 0.9548) Zero Point Vibrational Energy (zpe) 12656.8 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 B1B95/6-31G**
ABC
0.39344 0.17152 0.12066

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/6-31G**

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.429 0.934 -0.038
O2 -0.547 1.129 -0.003
O3 1.879 -0.012 -0.091
C4 -1.183 -0.025 0.017
O5 -0.665 -1.125 -0.001
H6 -2.270 0.123 0.053
H7 2.324 -0.068 0.760
H8 1.284 -0.783 -0.118

Atom - Atom Distances (Å)
  H1 O2 O3 C4 O5 H6 H7 H8
H10.99561.73201.87592.33142.81972.28781.9202
O20.99562.68211.31822.25711.99673.20292.6506
O31.73202.68213.06322.77814.15370.96240.9739
C41.87591.31823.06321.21521.09833.58482.5845
O52.33142.25712.77811.21522.03353.26041.9829
H62.81971.99674.15371.09832.03354.65233.6725
H72.28783.20290.96243.58483.26044.65231.5367
H81.92022.65060.97392.58451.98293.67251.5367

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 107.525 H1 O3 H7 113.104
H1 O3 H8 85.562 O2 H1 O3 158.226
O2 C4 O5 125.937 O2 C4 H6 111.110
O5 C4 H6 122.953 H7 O3 H8 105.045
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.358      
2 O -0.472      
3 O -0.636      
4 C 0.421      
5 O -0.466      
6 H 0.122      
7 H 0.329      
8 H 0.344      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.442 0.183 1.443 1.520
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.228 -1.454 3.738
y -1.454 -26.955 0.026
z 3.738 0.026 -22.143
Traceless
 xyz
x 5.321 -1.454 3.738
y -1.454 -6.269 0.026
z 3.738 0.026 0.948
Polar
3z2-r21.896
x2-y27.727
xy-1.454
xz3.738
yz0.026


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.355 -0.159 0.192
y -0.159 3.756 0.001
z 0.192 0.001 2.087


<r2> (average value of r2) Å2
<r2> 91.671
(<r2>)1/2 9.574