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 C4H4O (Furan)

using model chemistry: PBEPBE/aug-cc-pVTZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at PBEPBE/aug-cc-pVTZ
 hartrees
Energy at 0K-229.831624
Energy at 298.15K 
HF Energy-229.831624
Nuclear repulsion energy160.299647
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 PBEPBE/aug-cc-pVTZ
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 3210 3189 0.02 231.65 0.11 0.20
2 A1 3183 3162 0.28 36.65 0.28 0.44
3 A1 1465 1456 17.28 61.96 0.11 0.19
4 A1 1375 1366 2.26 14.84 0.35 0.52
5 A1 1132 1125 0.14 35.02 0.11 0.20
6 A1 1066 1059 7.16 7.87 0.11 0.20
7 A1 986 979 41.56 2.11 0.21 0.35
8 A1 857 851 13.04 0.05 0.73 0.84
9 A2 853 847 0.00 0.32 0.75 0.86
10 A2 699 695 0.00 1.41 0.75 0.86
11 A2 599 595 0.00 0.03 0.75 0.86
12 B1 815 810 0.03 1.29 0.75 0.86
13 B1 729 724 111.38 0.06 0.75 0.86
14 B1 609 606 19.03 0.71 0.75 0.86
15 B2 3203 3182 0.23 13.25 0.75 0.86
16 B2 3172 3152 2.03 104.00 0.75 0.86
17 B2 1542 1532 0.01 0.06 0.75 0.86
18 B2 1240 1232 0.17 0.60 0.75 0.86
19 B2 1164 1157 17.08 0.19 0.75 0.86
20 B2 1026 1019 2.31 4.88 0.75 0.86
21 B2 863 857 0.65 1.84 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 14894.4 cm-1
Scaled (by 0.9935) Zero Point Vibrational Energy (zpe) 14797.6 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 PBEPBE/aug-cc-pVTZ
ABC
0.31444 0.30668 0.15526

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/aug-cc-pVTZ

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 1.166
C2 0.000 1.098 0.348
C3 0.000 -1.098 0.348
C4 0.000 0.717 -0.962
C5 0.000 -0.717 -0.962
H6 0.000 2.058 0.850
H7 0.000 -2.058 0.850
H8 0.000 1.376 -1.824
H9 0.000 -1.376 -1.824

Atom - Atom Distances (Å)
  O1 C2 C3 C4 C5 H6 H7 H8 H9
O11.36901.36902.24542.24542.08232.08233.29093.2909
C21.36902.19581.36452.23811.08363.19582.18923.2919
C31.36902.19582.23811.36453.19581.08363.29192.1892
C42.24541.36452.23811.43322.25483.31421.08492.2632
C52.24542.23811.36451.43323.31422.25482.26321.0849
H62.08231.08363.19582.25483.31424.11642.75914.3524
H72.08233.19581.08363.31422.25484.11644.35242.7591
H83.29092.18923.29191.08492.26322.75914.35242.7525
H93.29093.29192.18922.26321.08494.35242.75912.7525

picture of Furan state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C4 110.455 O1 C2 H6 115.718
O1 C3 C5 110.455 O1 C3 H7 115.718
C2 O1 C3 106.638 C2 C4 C5 106.226
C2 C4 H8 126.325 C3 C5 C4 106.226
C3 C5 H9 126.325 C4 C2 H6 133.828
C4 C5 H9 127.448 C5 C3 H7 133.828
C5 C4 H8 127.448
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/aug-cc-pVTZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.228      
2 C -0.385      
3 C -0.385      
4 C -0.467      
5 C -0.467      
6 H 0.594      
7 H 0.594      
8 H 0.372      
9 H 0.372      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 -0.590 0.590
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -32.126 0.000 0.000
y 0.000 -24.677 0.000
z 0.000 0.000 -28.309
Traceless
 xyz
x -5.633 0.000 0.000
y 0.000 5.541 0.000
z 0.000 0.000 0.092
Polar
3z2-r20.184
x2-y2-7.449
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.275 0.000 0.000
y 0.000 9.003 0.000
z 0.000 0.000 8.130


<r2> (average value of r2) Å2
<r2> 82.139
(<r2>)1/2 9.063