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

using model chemistry: B1B95/STO-3G

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/STO-3G
 hartrees
Energy at 0K-262.484275
Energy at 298.15K-262.490746
Nuclear repulsion energy129.892127
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/STO-3G
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 3846 3396 26.19      
2 A 3305 2919 0.59      
3 A 2869 2533 2929.85      
4 A 2205 1947 295.52      
5 A 2096 1850 170.80      
6 A 1849 1633 0.32      
7 A 1783 1575 174.13      
8 A 1639 1447 9.90      
9 A 1391 1228 23.83      
10 A 1361 1202 55.35      
11 A 993 876 1.22      
12 A 911 805 9.33      
13 A 885 782 9.17      
14 A 723 639 43.94      
15 A 716 632 79.85      
16 A 635 561 3.43      
17 A 618 545 0.41      
18 A 337 298 6.33      

Unscaled Zero Point Vibrational Energy (zpe) 14080.2 cm-1
Scaled (by 0.883) Zero Point Vibrational Energy (zpe) 12432.9 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/STO-3G
ABC
0.36995 0.23548 0.14606

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/STO-3G

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.731 0.800 -0.066
O2 -0.464 1.165 -0.003
O3 1.584 -0.000 -0.104
C4 -1.078 0.000 0.017
O5 -0.464 -1.165 -0.003
H6 -2.195 0.000 0.061
H7 1.948 0.000 0.843
H8 0.732 -0.800 -0.065

Atom - Atom Distances (Å)
  H1 O2 O3 C4 O5 H6 H7 H8
H11.25121.16951.98022.30043.03621.71571.5991
O21.25122.35791.31732.32982.08762.80802.3005
O31.16952.35792.66492.35803.78251.01461.1690
C41.98021.31732.66491.31711.11763.13641.9806
O52.30042.32982.35801.31712.08772.80861.2519
H63.03622.08763.78251.11762.08774.21573.0368
H71.71572.80801.01463.13642.80864.21571.7153
H81.59912.30051.16901.98061.25193.03681.7153

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 100.848 H1 O3 H7 103.312
H1 O3 H8 86.287 O2 H1 O3 153.832
O2 C4 O5 124.350 O2 C4 H6 117.817
O5 C4 H6 117.832 H7 O3 H8 103.311
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/STO-3G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.221      
2 O -0.255      
3 O -0.330      
4 C 0.131      
5 O -0.255      
6 H 0.082      
7 H 0.186      
8 H 0.221      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.514 0.001 1.271 1.371
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.342 0.001 2.556
y 0.001 -24.722 -0.001
z 2.556 -0.001 -19.920
Traceless
 xyz
x 2.979 0.001 2.556
y 0.001 -5.091 -0.001
z 2.556 -0.001 2.112
Polar
3z2-r24.224
x2-y25.381
xy0.001
xz2.556
yz-0.001


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.134 0.000 0.327
y 0.000 2.274 0.000
z 0.327 0.000 0.890


<r2> (average value of r2) Å2
<r2> 77.291
(<r2>)1/2 8.792