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 C4H10O2 (Ethane, 1,2-dimethoxy-)

using model chemistry: HF/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2H 1Ag
Energy calculated at HF/3-21G
 hartrees
Energy at 0K-305.282033
Energy at 298.15K-305.293868
Nuclear repulsion energy250.842567
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 HF/3-21G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Ag 3290 2979 0.00      
2 Ag 3203 2900 0.00      
3 Ag 3175 2875 0.00      
4 Ag 1706 1545 0.00      
5 Ag 1690 1531 0.00      
6 Ag 1639 1484 0.00      
7 Ag 1567 1419 0.00      
8 Ag 1328 1203 0.00      
9 Ag 1229 1113 0.00      
10 Ag 1139 1031 0.00      
11 Ag 1044 946 0.00      
12 Ag 404 366 0.00      
13 Ag 336 304 0.00      
14 Au 3257 2949 116.63      
15 Au 3217 2913 121.52      
16 Au 1675 1517 12.40      
17 Au 1343 1216 14.41      
18 Au 1269 1149 3.09      
19 Au 934 846 0.34      
20 Au 244 221 18.70      
21 Au 128 116 13.47      
22 Au 69 63 6.46      
23 Bg 3227 2922 0.00      
24 Bg 3217 2913 0.00      
25 Bg 1675 1517 0.00      
26 Bg 1442 1306 0.00      
27 Bg 1282 1161 0.00      
28 Bg 1246 1128 0.00      
29 Bg 225 204 0.00      
30 Bg 125 113 0.00      
31 Bu 3290 2979 72.51      
32 Bu 3207 2904 69.97      
33 Bu 3174 2874 80.75      
34 Bu 1714 1552 3.43      
35 Bu 1693 1533 19.54      
36 Bu 1632 1478 10.73      
37 Bu 1500 1359 39.04      
38 Bu 1313 1189 130.90      
39 Bu 1233 1117 254.35      
40 Bu 983 891 48.16      
41 Bu 511 462 10.12      
42 Bu 144 130 7.99      

Unscaled Zero Point Vibrational Energy (zpe) 33357.1 cm-1
Scaled (by 0.9056) Zero Point Vibrational Energy (zpe) 30208.2 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 HF/3-21G
ABC
0.64163 0.04203 0.04063

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/3-21G

Point Group is C2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 1.379 1.152 0.000
O2 -1.379 -1.152 0.000
C3 -1.602 -2.567 0.000
C4 1.602 2.567 0.000
C5 0.000 0.758 0.000
C6 0.000 -0.758 0.000
H7 2.671 2.715 0.000
H8 -2.671 -2.715 0.000
H9 -1.175 -3.035 0.882
H10 -1.175 -3.035 -0.882
H11 1.175 3.035 0.882
H12 1.175 3.035 -0.882
H13 -0.517 1.123 0.880
H14 -0.517 1.123 -0.880
H15 0.517 -1.123 0.880
H16 0.517 -1.123 -0.880

Atom - Atom Distances (Å)
  O1 O2 C3 C4 C5 C6 H7 H8 H9 H10 H11 H12 H13 H14 H15 H16
O13.59294.76581.43281.43382.35542.02865.59954.98284.98282.08952.08952.09002.09002.58662.5866
O23.59291.43284.76582.35541.43385.59952.02862.08952.08954.98284.98282.58662.58662.09002.0900
C34.76581.43286.05163.69082.41636.79421.07931.08561.08566.31446.31443.94543.94542.71092.7109
C41.43284.76586.05162.41633.69081.07936.79426.31446.31441.08561.08562.71092.71093.94543.9454
C51.43382.35543.69082.41631.51613.31144.38174.06764.06762.70982.70981.08361.08362.13982.1398
C62.35541.43382.41633.69081.51614.38173.31142.70982.70984.06764.06762.13982.13981.08361.0836
H72.02865.59956.79421.07933.31144.38177.61776.97416.97411.76551.76553.67053.67054.48854.4885
H85.59952.02861.07936.79424.38173.31147.61771.76551.76556.97416.97414.48854.48853.67053.6705
H94.98282.08951.08566.31444.06762.70986.97411.76551.76336.50926.74384.20974.56332.55333.1019
H104.98282.08951.08566.31444.06762.70986.97411.76551.76336.74386.50924.56334.20973.10192.5533
H112.08954.98286.31441.08562.70984.06761.76556.97416.50926.74381.76332.55333.10194.20974.5633
H122.08954.98286.31441.08562.70984.06761.76556.97416.74386.50921.76333.10192.55334.56334.2097
H132.09002.58663.94542.71091.08362.13983.67054.48854.20974.56332.55333.10191.75972.47213.0344
H142.09002.58663.94542.71091.08362.13983.67054.48854.56334.20973.10192.55331.75973.03442.4721
H152.58662.09002.71093.94542.13981.08364.48853.67052.55333.10194.20974.56332.47213.03441.7597
H162.58662.09002.71093.94542.13981.08364.48853.67053.10192.55334.56334.20973.03442.47211.7597

picture of Ethane, 1,2-dimethoxy- state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C4 H7 106.864 O1 C4 H11 111.387
O1 C4 H12 111.387 O1 C5 C6 105.936
O1 C5 H13 111.480 O1 C5 H14 111.480
O2 C3 H8 106.864 O2 C3 H9 111.387
O2 C3 H10 111.387 O2 C6 C5 105.936
O2 C6 H15 111.480 O2 C6 H16 111.480
C3 O2 C6 114.895 C4 O1 C5 114.895
C5 C6 H15 109.671 C5 C6 H16 109.671
C6 C5 H13 109.671 C6 C5 H14 109.671
H7 C4 H11 109.276 H7 C4 H12 109.276
H8 C3 H9 109.276 H8 C3 H10 109.276
H9 C3 H10 108.609 H11 C4 H12 108.609
H13 C5 H14 108.568 H15 C6 H16 108.568
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.661 -0.494   -0.493
2 O -0.661 -0.494   -0.488
3 C -0.249 0.194   0.039
4 C -0.249 0.194   0.033
5 C -0.071 0.241   0.192
6 C -0.071 0.241   0.153
7 H 0.215 0.036   0.084
8 H 0.215 0.036   0.082
9 H 0.181 0.001   0.055
10 H 0.181 0.001   0.055
11 H 0.181 0.001   0.055
12 H 0.181 0.001   0.055
13 H 0.202 0.010   0.041
14 H 0.202 0.010   0.041
15 H 0.202 0.010   0.048
16 H 0.202 0.010   0.048


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 0.000 0.000
CHELPG 0.000 0.000 0.000 0.000
AIM        
ESP -0.010 -0.010 0.000 0.014


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -41.422 3.146 0.000
y 3.146 -27.446 0.000
z 0.000 0.000 -38.358
Traceless
 xyz
x -8.520 3.146 0.000
y 3.146 12.444 0.000
z 0.000 0.000 -3.924
Polar
3z2-r2-7.847
x2-y2-13.976
xy3.146
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 6.867 1.296 0.000
y 1.296 7.671 0.000
z 0.000 0.000 5.880


<r2> (average value of r2) Å2
<r2> 274.423
(<r2>)1/2 16.566