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All results from a given calculation for C4H5NO (Isoxazole, 5-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-282.637631
Energy at 298.15K-282.643934
HF Energy-282.032113
Nuclear repulsion energy218.314689
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 3311 3161 0.23      
2 A 3284 3135 1.73      
3 A 3177 3033 6.13      
4 A 3163 3019 7.08      
5 A 3096 2955 7.81      
6 A 1621 1547 8.61      
7 A 1579 1507 7.93      
8 A 1578 1506 21.96      
9 A 1499 1431 4.40      
10 A 1402 1338 16.58      
11 A 1348 1287 14.58      
12 A 1233 1177 11.20      
13 A 1174 1121 6.53      
14 A 1138 1086 4.01      
15 A 1070 1021 2.64      
16 A 1045 998 3.45      
17 A 947 904 6.73      
18 A 923 881 4.02      
19 A 867 827 8.72      
20 A 846 807 9.33      
21 A 808 771 43.93      
22 A 649 619 1.05      
23 A 641 612 1.08      
24 A 607 579 0.63      
25 A 326 311 1.74      
26 A 241 230 3.47      
27 A 92 87 0.73      

Unscaled Zero Point Vibrational Energy (zpe) 18831.5 cm-1
Scaled (by 0.9545) Zero Point Vibrational Energy (zpe) 17974.6 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
0.29358 0.11345 0.08311

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 -2.144 0.016 -0.000
H2 -2.497 -0.517 0.889
H3 -2.566 1.025 -0.000
H4 -2.497 -0.518 -0.888
C5 -0.645 0.108 -0.000
O6 0.061 -1.109 0.000
N7 1.519 -0.783 -0.000
C8 1.543 0.566 -0.000
H9 2.501 1.063 0.000
C10 0.236 1.158 0.000
H11 -0.004 2.209 -0.000

Atom - Atom Distances (Å)
  C1 H2 H3 H4 C5 O6 N7 C8 H9 C10 H11
C11.09461.09381.09461.50172.47513.74883.72724.76172.64013.0641
H21.09461.78091.77672.14742.77204.12194.27585.31703.32693.7994
H31.09381.78091.78092.12873.38464.46724.13425.06782.80572.8224
H41.09461.77671.78092.14742.77174.12174.27585.31713.32713.7998
C51.50172.14742.12872.14741.40732.34022.23493.28791.37102.1966
O62.47512.77203.38462.77171.40731.49432.23683.26722.27473.3194
N73.74884.12194.46724.12172.34021.49431.34932.09072.32683.3576
C83.72724.27584.13424.27582.23492.23681.34931.07981.43422.2567
H94.76175.31705.06785.31713.28793.26722.09071.07982.26722.7557
C102.64013.32692.80573.32711.37102.27472.32681.43422.26721.0780
H113.06413.79942.82243.79982.19663.31943.35762.25672.75571.0780

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 116.570 C1 C5 C10 133.524
H2 C1 H3 108.935 H2 C1 H4 108.498
H2 C1 C5 110.623 H3 C1 H4 108.935
H3 C1 C5 109.190 H4 C1 C5 110.621
C5 O6 N7 107.474 C5 C10 C8 105.608
C5 C10 H11 127.104 O6 C5 C10 109.907
O6 N7 C8 103.624 N7 C8 H9 118.370
N7 C8 C10 113.388 C8 C10 H11 127.288
H9 C8 C10 128.242
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 -0.596     -0.671
2 H 0.227     0.193
3 H 0.210     0.198
4 H 0.227     0.193
5 C 0.331     0.550
6 O -0.340     -0.143
7 N -0.178     -0.325
8 C 0.011     0.278
9 H 0.240     0.097
10 C -0.344     -0.615
11 H 0.213     0.246


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -1.772 2.745 0.000 3.267
CHELPG        
AIM        
ESP -1.752 2.680 0.000 3.202


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -31.981 3.518 0.000
y 3.518 -36.329 0.000
z 0.000 0.000 -37.061
Traceless
 xyz
x 4.714 3.518 0.000
y 3.518 -1.808 0.000
z 0.000 0.000 -2.906
Polar
3z2-r2-5.812
x2-y24.348
xy3.518
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 8.645 0.446 0.000
y 0.446 6.675 0.000
z 0.000 0.000 3.113


<r2> (average value of r2) Å2
<r2> 141.324
(<r2>)1/2 11.888