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All results from a given calculation for C3H3NO (Isoxazole)

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-243.737777
Energy at 298.15K 
HF Energy-243.203535
Nuclear repulsion energy157.183937
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' 3289 3161 0.32      
2 A' 3262 3135 0.07      
3 A' 3240 3114 1.62      
4 A' 1563 1502 9.04      
5 A' 1394 1340 23.98      
6 A' 1371 1318 6.27      
7 A' 1232 1184 5.88      
8 A' 1159 1114 12.97      
9 A' 1033 993 3.52      
10 A' 995 957 11.30      
11 A' 931 895 5.68      
12 A' 889 854 0.67      
13 A' 799 768 15.33      
14 A" 896 861 6.73      
15 A" 882 847 0.90      
16 A" 778 748 65.42      
17 A" 621 597 10.92      
18 A" 563 541 9.64      

Unscaled Zero Point Vibrational Energy (zpe) 12447.4 cm-1
Scaled (by 0.9611) Zero Point Vibrational Energy (zpe) 11963.2 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
0.31154 0.29826 0.15238

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 1.131 0.403 0.000
C2 0.652 -0.967 0.000
C3 0.000 1.162 0.000
N4 -0.675 -1.071 0.000
O5 -1.150 0.353 0.000
H6 2.159 0.735 0.000
H7 1.247 -1.872 0.000
H8 -0.178 2.227 0.000

Atom - Atom Distances (Å)
  C1 C2 C3 N4 O5 H6 H7 H8
C11.45091.36232.33112.28221.08002.27722.2459
C21.45092.22631.33122.23422.27311.08283.3005
C31.36232.22632.33251.40612.20043.27961.0806
N42.33111.33122.33251.50153.36042.08203.3359
O52.28222.23421.40611.50153.33113.27062.1117
H61.08002.27312.20043.36043.33112.76172.7724
H72.27721.08283.27962.08203.27062.76174.3397
H82.24593.30051.08063.33592.11172.77244.3397

picture of Isoxazole state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N4 113.769 C1 C2 H7 127.394
C1 C3 O5 111.037 C1 C3 H8 133.332
C2 C1 C3 104.580 C2 C1 H6 127.220
C2 N4 O5 103.972 C3 C1 H6 128.200
C3 O5 N4 106.642 N4 C2 H7 118.837
O5 C3 H8 115.630
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability