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 C4H8 (methylcyclopropane)

using model chemistry: CCSD=FULL/aug-cc-pVTZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at CCSD=FULL/aug-cc-pVTZ
 hartrees
Energy at 0K-156.970357
Energy at 298.15K 
HF Energy-156.152129
Nuclear repulsion energy124.991046
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 CCSD=FULL/aug-cc-pVTZ
Rotational Constants (cm-1) from geometry optimized at CCSD=FULL/aug-cc-pVTZ
ABC
0.52469 0.21512 0.18888

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.348 0.406 0.000
C2 -0.884 1.263 0.000
H3 1.284 0.943 0.000
C4 0.348 -0.889 0.752
C5 0.348 -0.889 -0.752
H6 1.251 -1.192 1.258
H7 1.251 -1.192 -1.258
H8 -0.565 -1.170 1.252
H9 -0.565 -1.170 -1.252
H10 -1.777 0.637 0.000
H11 -0.924 1.900 0.883
H12 -0.924 1.900 -0.883

Atom - Atom Distances (Å)
  C1 C2 H3 C4 C5 H6 H7 H8 H9 H10 H11 H12
C11.50101.07911.49751.49752.22452.22452.21022.21022.13802.15212.1521
C21.50102.19142.59122.59123.48763.48762.75442.75441.09051.08981.0898
H31.07912.19142.19072.19072.47842.47843.07473.07473.07642.56322.5632
C41.49752.59122.19071.50501.07752.22411.07852.22052.72263.06833.4745
C51.49752.59122.19071.50502.22411.07752.22051.07852.72263.47453.0683
H62.22453.48762.47841.07752.22412.51531.81623.09763.75423.79864.3442
H72.22453.48762.47842.22411.07752.51533.09761.81623.75424.34423.7986
H82.21022.75443.07471.07852.22051.81623.09762.50332.51013.11303.7566
H92.21022.75443.07472.22051.07853.09761.81622.50332.51013.75663.1130
H102.13801.09053.07642.72262.72263.75423.75422.51012.51011.76161.7616
H112.15211.08982.56323.06833.47453.79864.34423.11303.75661.76161.7662
H122.15211.08982.56323.47453.06834.34423.79863.75663.11301.76161.7662

picture of methylcyclopropane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H10 110.175 C1 C2 H11 111.345
C1 C2 H12 111.345 C1 C4 H5 59.834
C1 C4 H6 118.598 C1 C4 H8 117.259
C1 H5 C4 59.834 C1 H5 H7 118.598
C1 H5 H9 117.259 C2 C1 C3 115.304
C2 C1 C4 119.577 C2 C1 H5 119.577
C3 C1 C4 115.515 C3 C1 H5 115.515
C4 C1 H5 60.332 C4 H5 H7 117.957
C4 H5 H9 117.569 H5 C4 H6 117.957
H5 C4 H8 117.569 H6 C4 H8 114.781
H7 H5 H9 114.781 H10 C2 H11 107.794
H10 C2 H12 107.794 H11 C2 H12 108.247
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability