Sorry, I lost your molecule, please back up and select it again.
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 (Maleic Anhydride)

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

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at TPSSh/6-31+G**
 hartrees
Energy at 0K-379.318680
Energy at 298.15K-379.321893
HF Energy-379.318680
Nuclear repulsion energy273.947277
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 TPSSh/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 A1 3280 3157 0.30      
2 A1 1884 1813 54.04      
3 A1 1649 1587 2.51      
4 A1 1266 1218 145.38      
5 A1 1084 1043 23.33      
6 A1 872 840 7.25      
7 A1 625 602 0.72      
8 A1 395 380 10.08      
9 A2 972 936 0.00      
10 A2 751 723 0.00      
11 A2 258 248 0.00      
12 B1 849 818 72.95      
13 B1 632 608 0.14      
14 B1 164 158 2.98      
15 B2 3259 3137 0.21      
16 B2 1825 1756 649.59      
17 B2 1338 1288 1.35      
18 B2 1061 1021 51.28      
19 B2 894 860 137.97      
20 B2 694 668 41.85      
21 B2 551 531 3.69      

Unscaled Zero Point Vibrational Energy (zpe) 12150.4 cm-1
Scaled (by 0.9625) Zero Point Vibrational Energy (zpe) 11694.8 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 TPSSh/6-31+G**
ABC
0.22785 0.08140 0.05997

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.963
C2 0.000 1.133 0.162
C3 0.000 -1.133 0.162
O4 0.000 2.247 0.605
O5 0.000 -2.247 0.605
C6 0.000 0.670 -1.263
C7 0.000 -0.670 -1.263
H8 0.000 1.366 -2.091
H9 0.000 -1.366 -2.091

Atom - Atom Distances (Å)
  O1 C2 C3 O4 O5 C6 C7 H8 H9
O11.38751.38752.27522.27522.32502.32503.34613.3461
C21.38752.26581.19893.40871.49882.29802.26563.3649
C31.38752.26583.40871.19892.29801.49883.36492.2656
O42.27521.19893.40874.49372.44533.46372.83714.5082
O52.27523.40871.19894.49373.46372.44534.50822.8371
C62.32501.49882.29802.44533.46371.33921.08202.1975
C72.32502.29801.49883.46372.44531.33922.19751.0820
H83.34612.26563.36492.83714.50821.08202.19752.7316
H93.34613.36492.26564.50822.83712.19751.08202.7316

picture of Maleic Anhydride state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 O4 123.037 O1 C2 C6 107.258
O1 C3 O5 123.037 O1 C3 C7 107.258
C2 O1 C3 109.469 C2 C6 C7 108.007
C2 C6 H8 121.941 C3 C7 C6 108.007
C3 C7 H9 121.941 O4 C2 C6 129.705
O5 C3 C7 129.705 C6 C7 H9 130.052
C7 C6 H8 130.052
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at TPSSh/6-31+G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.317      
2 C 0.284      
3 C 0.284      
4 O -0.430      
5 O -0.430      
6 C 0.105      
7 C 0.105      
8 H 0.200      
9 H 0.200      


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 -4.357 4.357
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.314 0.000 0.000
y 0.000 12.147 0.000
z 0.000 0.000 7.285


<r2> (average value of r2) Å2
<r2> 172.327
(<r2>)1/2 13.127