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All results from a given calculation for C4H5NO (Isoxazole, 5-methyl-)

using model chemistry: MP2/CEP-31G

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/CEP-31G
 hartrees
Energy at 0K-50.563388
Energy at 298.15K-50.569550
HF Energy-50.018338
Nuclear repulsion energy112.733944
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/CEP-31G
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 3276 3165 0.94      
2 A 3252 3143 4.03      
3 A 3160 3054 24.95      
4 A 3149 3043 24.87      
5 A 3048 2945 27.81      
6 A 1612 1558 18.28      
7 A 1523 1472 13.51      
8 A 1498 1447 11.81      
9 A 1464 1415 2.16      
10 A 1406 1358 18.20      
11 A 1308 1264 15.31      
12 A 1229 1188 14.10      
13 A 1163 1124 7.74      
14 A 1097 1060 1.89      
15 A 1047 1012 8.09      
16 A 1028 994 3.88      
17 A 920 889 5.43      
18 A 886 856 6.48      
19 A 839 810 14.54      
20 A 815 788 9.30      
21 A 792 766 59.00      
22 A 628 606 1.09      
23 A 610 589 0.69      
24 A 574 555 0.08      
25 A 312 302 2.69      
26 A 235 227 4.74      
27 A 96 93 0.99      

Unscaled Zero Point Vibrational Energy (zpe) 18483.3 cm-1
Scaled (by 0.9663) Zero Point Vibrational Energy (zpe) 17860.4 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/CEP-31G
ABC
0.28396 0.10961 0.08031

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-31G

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -2.185 0.014 0.000
H2 -2.539 -0.530 0.900
H3 -2.627 1.030 -0.001
H4 -2.538 -0.532 -0.898
C5 -0.663 0.128 0.000
O6 0.060 -1.110 -0.000
N7 1.514 -0.818 0.000
C8 1.587 0.559 -0.000
H9 2.579 1.017 0.000
C10 0.264 1.193 -0.000
H11 0.036 2.260 -0.000

Atom - Atom Distances (Å)
  C1 H2 H3 H4 C5 O6 N7 C8 H9 C10 H11
C11.10911.10831.10911.52652.51023.79143.81074.86852.71743.1585
H21.10911.80371.79812.18212.81014.16134.36035.42143.41003.9012
H31.10831.80371.80372.16173.43504.53514.24015.20642.89532.9330
H41.10911.79811.80372.18202.80904.16074.36035.42163.41053.9023
C51.52652.18212.16172.18201.43342.37362.29013.36141.41102.2435
O62.51022.81013.43502.80901.43341.48342.26213.29712.31153.3703
N73.79144.16134.53514.16072.37361.48341.37922.12172.36793.4152
C83.81074.36034.24014.36032.29012.26211.37921.09301.46692.3023
H94.86855.42145.20645.42163.36143.29712.12171.09302.32222.8314
C102.71743.41002.89533.41051.41102.31152.36791.46692.32221.0918
H113.15853.90122.93303.90232.24353.37033.41522.30232.83141.0918

picture of Isoxazole, 5-methyl- state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C5 O6 115.969 C1 C5 C10 135.320
H2 C1 H3 108.858 H2 C1 H4 108.311
H2 C1 C5 110.772 H3 C1 H4 108.860
H3 C1 C5 109.229 H4 C1 C5 110.765
C5 O6 N7 108.919 C5 C10 C8 105.442
C5 C10 H11 126.909 O6 C5 C10 108.711
O6 N7 C8 104.355 N7 C8 H9 117.772
N7 C8 C10 112.572 C8 C10 H11 127.649
H9 C8 C10 129.655
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability