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: PBE1PBE/6-31G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at PBE1PBE/6-31G**
 hartrees
Energy at 0K-229.756975
Energy at 298.15K 
HF Energy-229.756975
Nuclear repulsion energy161.341750
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
(Å4/u)
Dep P Dep U
1 A1 3331 3175 0.02 192.18 0.12 0.22
2 A1 3302 3147 0.73 29.74 0.27 0.42
3 A1 1553 1480 20.26 31.49 0.24 0.38
4 A1 1453 1385 2.99 13.36 0.44 0.61
5 A1 1187 1132 0.94 25.83 0.26 0.41
6 A1 1125 1072 14.54 7.49 0.26 0.42
7 A1 1038 989 38.16 0.92 0.36 0.53
8 A1 891 849 14.16 0.47 0.66 0.80
9 A2 882 841 0.00 1.06 0.75 0.86
10 A2 736 701 0.00 1.92 0.75 0.86
11 A2 618 589 0.00 0.05 0.75 0.86
12 B1 843 803 0.24 0.06 0.75 0.86
13 B1 766 730 91.99 1.07 0.75 0.86
14 B1 633 603 20.41 2.37 0.75 0.86
15 B2 3325 3169 1.60 14.34 0.75 0.86
16 B2 3291 3136 2.10 97.05 0.75 0.86
17 B2 1636 1559 0.76 0.28 0.75 0.86
18 B2 1301 1240 0.99 0.60 0.75 0.86
19 B2 1257 1198 17.19 0.92 0.75 0.86
20 B2 1085 1034 3.13 4.76 0.75 0.86
21 B2 892 850 0.27 3.78 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 15571.2 cm-1
Scaled (by 0.9531) Zero Point Vibrational Energy (zpe) 14840.9 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 PBE1PBE/6-31G**
ABC
0.31863 0.31049 0.15725

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 1.155
C2 0.000 1.088 0.348
C3 0.000 -1.088 0.348
C4 0.000 0.715 -0.958
C5 0.000 -0.715 -0.958
H6 0.000 2.043 0.851
H7 0.000 -2.043 0.851
H8 0.000 1.373 -1.815
H9 0.000 -1.373 -1.815

Atom - Atom Distances (Å)
  O1 C2 C3 C4 C5 H6 H7 H8 H9
O11.35431.35432.23012.23012.06592.06593.27213.2721
C21.35432.17611.35812.22641.07963.17162.18223.2771
C31.35432.17612.22641.35813.17161.07963.27712.1822
C42.23011.35812.22641.43032.24403.29871.08112.2578
C52.23012.22641.35811.43033.29872.24402.25781.0811
H62.06591.07963.17162.24403.29874.08692.74924.3340
H72.06593.17161.07963.29872.24404.08694.33402.7492
H83.27212.18223.27711.08112.25782.74924.33402.7467
H93.27213.27712.18222.25781.08114.33402.74922.7467

picture of Furan state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C4 110.606 O1 C2 H6 115.701
O1 C3 C5 110.606 O1 C3 H7 115.701
C2 O1 C3 106.914 C2 C4 C5 105.937
C2 C4 H8 126.559 C3 C5 C4 105.937
C3 C5 H9 126.559 C4 C2 H6 133.693
C4 C5 H9 127.504 C5 C3 H7 133.693
C5 C4 H8 127.504
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 O -0.396      
2 C 0.056      
3 C 0.056      
4 C -0.227      
5 C -0.227      
6 H 0.190      
7 H 0.190      
8 H 0.180      
9 H 0.180      


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 -0.594 0.594
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -31.212 0.000 0.000
y 0.000 -23.413 0.000
z 0.000 0.000 -27.350
Traceless
 xyz
x -5.830 0.000 0.000
y 0.000 5.867 0.000
z 0.000 0.000 -0.038
Polar
3z2-r2-0.076
x2-y2-7.798
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.573 0.000 0.000
y 0.000 7.126 0.000
z 0.000 0.000 6.655


<r2> (average value of r2) Å2
<r2> 80.699
(<r2>)1/2 8.983