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 C4H3ClO (Furan, 2-chloro)

using model chemistry: QCISD/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at QCISD/3-21G
 hartrees
Energy at 0K-684.604693
Energy at 298.15K-684.608347
HF Energy-684.046729
Nuclear repulsion energy257.520585
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 QCISD/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' 3298 3196 0.03      
2 A' 3276 3175 0.44      
3 A' 3250 3149 0.97      
4 A' 1598 1548 16.73      
5 A' 1501 1455 35.01      
6 A' 1379 1337 17.20      
7 A' 1276 1237 13.75      
8 A' 1177 1141 19.20      
9 A' 1105 1071 42.45      
10 A' 1022 990 18.04      
11 A' 1004 973 7.59      
12 A' 908 880 5.49      
13 A' 890 863 34.03      
14 A' 439 425 3.40      
15 A' 271 262 0.11      
16 A" 847 821 2.04      
17 A" 839 814 21.38      
18 A" 751 728 64.81      
19 A" 624 605 2.84      
20 A" 595 577 9.71      
21 A" 220 214 2.95      

Unscaled Zero Point Vibrational Energy (zpe) 13134.7 cm-1
Scaled (by 0.9692) Zero Point Vibrational Energy (zpe) 12730.2 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 QCISD/3-21G
ABC
0.29881 0.06624 0.05422

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.255 0.000
C2 1.324 -0.048 0.000
C3 1.398 -1.514 0.000
C4 0.115 -1.982 0.000
O5 -0.806 -0.891 0.000
Cl6 -0.864 1.840 0.000
H7 2.145 0.653 0.000
H8 2.302 -2.108 0.000
H9 -0.335 -2.962 0.000

Atom - Atom Distances (Å)
  C1 C2 C3 C4 O5 Cl6 H7 H8 H9
C11.35822.25492.24001.40151.80492.18183.29913.2349
C21.35821.46782.28042.29062.88991.08012.28033.3530
C32.25491.46781.36552.29024.04552.29251.08172.2581
C42.24002.28041.36551.42743.94523.32642.19061.0787
O51.40152.29062.29021.42742.73203.33093.33762.1240
Cl61.80492.88994.04553.94522.73203.23465.06064.8315
H72.18181.08012.29253.32643.33093.23462.76574.3842
H83.29912.28031.08172.19063.33765.06062.76572.7715
H93.23493.35302.25811.07872.12404.83154.38422.7715

picture of Furan, 2-chloro state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 105.804 C1 C2 H7 126.591
C1 O5 C4 104.714 C2 C1 O5 112.193
C2 C1 Cl6 131.503 C2 C3 C4 107.138
C2 C3 H8 126.196 C3 C2 H7 127.605
C3 C4 O5 110.152 C3 C4 H9 134.664
C4 C3 H8 126.666 O5 C1 Cl6 116.304
O5 C4 H9 115.184
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability