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 C4H8O2 (1,3-Dioxolane, 2-methyl-)

using model chemistry: MP2/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A
Energy calculated at MP2/3-21G
 hartrees
Energy at 0K-304.734335
Energy at 298.15K-304.744750
HF Energy-304.136743
Nuclear repulsion energy257.922286
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 MP2/3-21G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A 3193 3048 28.44      
2 A 3191 3045 21.72      
3 A 3189 3043 13.55      
4 A 3181 3036 13.28      
5 A 3108 2967 9.53      
6 A 3105 2963 54.84      
7 A 3097 2957 42.60      
8 A 3093 2952 24.73      
9 A 1605 1532 0.32      
10 A 1598 1525 2.49      
11 A 1593 1520 2.13      
12 A 1587 1515 3.63      
13 A 1491 1423 12.49      
14 A 1456 1389 38.90      
15 A 1415 1350 1.29      
16 A 1409 1345 17.53      
17 A 1341 1280 8.28      
18 A 1263 1205 5.84      
19 A 1229 1173 0.20      
20 A 1181 1128 19.21      
21 A 1162 1110 9.30      
22 A 1143 1091 31.02      
23 A 1123 1072 112.13      
24 A 1041 994 14.32      
25 A 991 946 33.61      
26 A 932 890 12.49      
27 A 919 877 3.90      
28 A 838 799 27.20      
29 A 814 777 9.97      
30 A 682 651 2.54      
31 A 622 594 5.46      
32 A 459 438 16.04      
33 A 346 331 2.52      
34 A 251 239 0.83      
35 A 233 223 0.66      
36 A 52 49 12.28      

Unscaled Zero Point Vibrational Energy (zpe) 26965.7 cm-1
Scaled (by 0.9545) Zero Point Vibrational Energy (zpe) 25738.8 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 MP2/3-21G
ABC
0.20519 0.11474 0.08694

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/3-21G

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.986 0.006 0.394
H2 2.551 -0.928 0.345
H3 2.621 0.839 0.082
H4 1.650 0.168 1.421
C5 0.761 -0.079 -0.504
H6 1.008 -0.207 -1.562
O7 -0.051 1.157 -0.404
O8 -0.069 -1.201 -0.021
C9 -1.462 -0.688 0.016
H10 -2.001 -1.265 0.767
H11 -1.943 -0.775 -0.964
C12 -1.252 0.791 0.389
H13 -1.064 0.893 1.463
H14 -2.063 1.448 0.075

Atom - Atom Distances (Å)
  C1 H2 H3 H4 C5 H6 O7 O8 C9 H10 H11 C12 H13 H14
C11.09301.09281.09281.52072.19692.47102.41943.53664.20094.22983.33113.35064.3098
H21.09301.78781.78092.15472.55593.41652.65934.03284.58354.68314.17314.19865.1969
H31.09281.78781.78522.15512.52942.73383.37804.35905.12424.95293.88513.93524.7237
H41.09281.78091.78522.13483.07452.68362.62903.51983.97624.41493.14232.80904.1521
C51.52072.15472.15512.13481.09411.48181.47742.36243.26372.83032.36772.85363.2628
H62.19692.55592.52943.07451.09412.07912.12692.96993.94963.06473.14823.82813.8544
O72.47103.41652.73382.68361.48182.07912.38912.35983.32272.76181.48522.14072.0896
O82.41942.65933.37802.62901.47742.12692.38911.48472.08742.14092.35302.75263.3177
C93.53664.03284.35903.51982.36242.96992.35981.48471.09041.09541.53922.17942.2197
H104.20094.58355.12423.97623.26373.94963.32272.08741.09041.80022.22052.45302.8006
H114.22984.68314.95294.41492.83033.06472.76182.14091.09541.80022.18203.07342.4570
C123.33114.17313.88513.14232.36773.14821.48522.35301.53922.22052.18201.09521.0905
H133.35064.19863.93522.80902.85363.82812.14072.75262.17942.45303.07341.09521.7984
H144.30985.19694.72374.15213.26283.85442.08963.31772.21972.80062.45701.09051.7984

picture of 1,3-Dioxolane, 2-methyl- state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C5 H6 113.310 C1 C5 O7 110.763
C1 C5 O8 107.593 H2 C1 H3 109.752
H2 C1 H4 109.126 H2 C1 C5 109.968
H3 C1 H4 109.529 H3 C1 C5 110.014
H4 C1 C5 108.427 C5 O7 C12 105.883
C5 O8 C9 105.798 H6 C5 O7 106.660
H6 C5 O8 110.721 O7 C5 O8 107.679
O7 C12 C9 102.549 O7 C12 H13 111.217
O7 C12 H14 107.449 O8 C9 H10 107.326
O8 C9 H11 111.262 O8 C9 C12 102.166
C9 C12 H13 110.509 C9 C12 H14 114.064
H10 C9 H11 110.895 H10 C9 C12 114.135
H11 C9 C12 110.698 H13 C12 H14 110.742
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at MP2/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.551     -0.540
2 H 0.195     0.134
3 H 0.193     0.136
4 H 0.199     0.170
5 C 0.271     0.603
6 H 0.194     0.008
7 O -0.493     -0.468
8 O -0.494     -0.447
9 C -0.153     0.013
10 H 0.205     0.098
11 H 0.192     0.069
12 C -0.153     0.093
13 H 0.191     0.056
14 H 0.204     0.075


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -1.183 0.025 0.463 1.271
CHELPG        
AIM        
ESP -1.203 0.030 0.489 1.299


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -31.483 -0.198 -1.356
y -0.198 -42.433 1.315
z -1.356 1.315 -36.439
Traceless
 xyz
x 7.953 -0.198 -1.356
y -0.198 -8.472 1.315
z -1.356 1.315 0.519
Polar
3z2-r21.037
x2-y210.950
xy-0.198
xz-1.356
yz1.315


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 7.776 -0.076 -0.368
y -0.076 5.759 0.048
z -0.368 0.048 5.827


<r2> (average value of r2) Å2
<r2> 150.960
(<r2>)1/2 12.287