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 CH2CH(CH3)2 (Isobutyl radical)

using model chemistry: wB97X-D/TZVP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 2A'
Energy calculated at wB97X-D/TZVP
 hartrees
Energy at 0K-157.788135
Energy at 298.15K-157.796999
HF Energy-157.788135
Nuclear repulsion energy126.649955
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 wB97X-D/TZVP
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' 3153 3011 16.88      
2 A' 3128 2987 52.11      
3 A' 3122 2982 50.02      
4 A' 3047 2910 18.45      
5 A' 2956 2823 28.46      
6 A' 1520 1452 11.37      
7 A' 1504 1436 6.54      
8 A' 1475 1409 3.52      
9 A' 1423 1359 5.86      
10 A' 1334 1274 3.41      
11 A' 1216 1161 1.22      
12 A' 1100 1051 1.39      
13 A' 994 949 1.26      
14 A' 827 790 0.05      
15 A' 545 521 37.99      
16 A' 421 402 15.59      
17 A' 374 357 0.41      
18 A' 254 242 0.16      
19 A" 3258 3112 14.34      
20 A" 3125 2984 12.58      
21 A" 3119 2979 9.57      
22 A" 3044 2907 36.06      
23 A" 1496 1429 0.70      
24 A" 1493 1425 3.20      
25 A" 1409 1346 7.50      
26 A" 1342 1281 0.24      
27 A" 1194 1140 0.70      
28 A" 981 937 0.01      
29 A" 954 911 0.69      
30 A" 920 879 0.53      
31 A" 386 368 0.23      
32 A" 221 211 0.00      
33 A" 199 190 0.09      

Unscaled Zero Point Vibrational Energy (zpe) 25765.6 cm-1
Scaled (by 0.955) Zero Point Vibrational Energy (zpe) 24606.1 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 wB97X-D/TZVP
ABC
0.28253 0.26554 0.15504

See section I.F.4 to change rotational constant units
Geometric Data calculated at wB97X-D/TZVP

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.277 0.242 0.000
C2 0.867 1.205 0.000
H3 -1.211 0.819 0.000
H4 1.317 1.536 0.929
H5 1.317 1.536 -0.929
C6 -0.277 -0.625 -1.265
C7 -0.277 -0.625 1.265
H8 0.631 -1.230 -1.306
H9 -1.137 -1.298 -1.275
H10 -0.319 -0.012 -2.169
H11 0.631 -1.230 1.306
H12 -1.137 -1.298 1.275
H13 -0.319 -0.012 2.169

Atom - Atom Distances (Å)
  C1 C2 H3 H4 H5 C6 C7 H8 H9 H10 H11 H12 H13
C11.49541.09842.25342.25341.53351.53352.16702.17602.18452.16702.17602.1845
C21.49542.11331.08401.08402.50152.50152.77353.45042.75582.77353.45042.7558
H31.09842.11332.78702.78702.13512.13513.04942.47232.48873.04942.47232.4887
H42.25341.08402.78701.85823.46742.70573.62164.34833.83052.87443.76432.5712
H52.25341.08402.78701.85822.70573.46742.87443.76432.57123.62164.34833.8305
C61.53352.50152.13513.46742.70572.53061.09191.09221.09262.79342.76513.4890
C71.53352.50152.13512.70573.46742.53062.79342.76513.48901.09191.09221.0926
H82.16702.77353.04943.62162.87441.09192.79341.76961.76912.61233.12933.8030
H92.17603.45042.47234.34833.76431.09222.76511.76961.76663.12932.54983.7661
H102.18452.75582.48873.83052.57121.09263.48901.76911.76663.80303.76614.3386
H112.16702.77353.04942.87443.62162.79341.09192.61233.12933.80301.76961.7691
H122.17603.45042.47233.76434.34832.76511.09223.12932.54983.76611.76961.7666
H132.18452.75582.48872.57123.83053.48901.09263.80303.76614.33861.76911.7666

picture of Isobutyl radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H4 120.933 C1 C2 H5 120.933
C1 C6 H8 110.121 C1 C6 H9 110.816
C1 C6 H10 111.478 C1 C7 H11 110.121
C1 C7 H12 110.816 C1 C7 H13 111.478
C2 C1 H3 108.152 C2 C1 C6 111.350
C2 C1 C7 111.350 H3 C1 C6 107.282
H3 C1 C7 107.282 H4 C2 H5 117.980
C6 C1 C7 111.203 H8 C6 H9 108.236
H8 C6 H10 108.161 H9 C6 H10 107.918
H11 C7 H12 108.236 H11 C7 H13 108.161
H12 C7 H13 107.918
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at wB97X-D/TZVP Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.001      
2 C -0.363      
3 H 0.126      
4 H 0.139      
5 H 0.139      
6 C -0.385      
7 C -0.385      
8 H 0.118      
9 H 0.121      
10 H 0.125      
11 H 0.118      
12 H 0.121      
13 H 0.125      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.312 -0.024 0.000 0.313
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -28.134 0.308 0.000
y 0.308 -28.199 0.000
z 0.000 0.000 -27.380
Traceless
 xyz
x -0.345 0.308 0.000
y 0.308 -0.442 0.000
z 0.000 0.000 0.787
Polar
3z2-r21.574
x2-y20.065
xy0.308
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 6.921 0.612 0.000
y 0.612 7.172 0.000
z 0.000 0.000 7.494


<r2> (average value of r2) Å2
<r2> 94.369
(<r2>)1/2 9.714