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 CH3CH(NH2)COOH (Alanine)

using model chemistry: HF/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A
Energy calculated at HF/6-31G(2df,p)
 hartrees
Energy at 0K-321.907257
Energy at 298.15K-321.917026
Nuclear repulsion energy252.064176
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 HF/6-31G(2df,p)
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 4046 3664 184.92      
2 A 3825 3464 10.67      
3 A 3736 3383 5.06      
4 A 3285 2975 12.76      
5 A 3235 2930 40.55      
6 A 3181 2880 16.82      
7 A 3173 2873 20.58      
8 A 2041 1848 349.84      
9 A 1798 1628 37.28      
10 A 1616 1463 15.20      
11 A 1608 1456 1.95      
12 A 1545 1399 278.75      
13 A 1537 1392 25.97      
14 A 1511 1368 144.52      
15 A 1445 1308 79.47      
16 A 1339 1212 6.46      
17 A 1322 1197 8.08      
18 A 1249 1131 13.04      
19 A 1185 1073 60.52      
20 A 1096 993 0.56      
21 A 1012 916 40.62      
22 A 958 867 99.51      
23 A 881 798 4.93      
24 A 812 735 9.20      
25 A 784 710 123.38      
26 A 601 544 11.45      
27 A 568 515 1.98      
28 A 440 398 6.98      
29 A 384 347 12.07      
30 A 303 274 22.31      
31 A 298 269 9.29      
32 A 246 222 0.91      
33 A 70 63 1.55      

Unscaled Zero Point Vibrational Energy (zpe) 25562.0 cm-1
Scaled (by 0.9055) Zero Point Vibrational Energy (zpe) 23146.4 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 HF/6-31G(2df,p)
ABC
0.16641 0.11575 0.07250

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/6-31G(2df,p)

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 1.045 1.373 -0.076
C2 1.498 -1.104 -0.154
C3 0.638 0.043 0.366
C4 -0.844 -0.184 0.047
O5 -1.557 0.916 -0.098
O6 -1.324 -1.259 -0.024
H7 1.311 1.365 -1.040
H8 1.827 1.704 0.447
H9 1.134 -2.053 0.217
H10 1.475 -1.139 -1.240
H11 0.679 0.047 1.453
H12 2.528 -0.971 0.162
H13 -0.973 1.661 -0.050

Atom - Atom Distances (Å)
  N1 C2 C3 C4 O5 O6 H7 H8 H9 H10 H11 H12 H13
N12.51941.45862.45122.64173.54111.00080.99813.43902.80192.05612.78372.0385
C22.51941.52582.52483.66302.82922.63052.89111.08151.08672.14051.08573.7104
C31.45861.52581.53332.40712.38702.04432.04432.15922.16331.08792.15472.3208
C42.45122.52481.53331.31861.17912.86913.29622.72652.81962.08613.46491.8527
O52.64173.66302.40711.31862.18853.05283.51754.01893.83712.85634.50720.9485
O63.54112.82922.38701.17912.18853.85574.35132.59393.05442.81083.86722.9417
H71.00082.63052.04432.86913.05283.85571.61083.64622.51782.89042.89542.5075
H80.99812.89112.04433.29623.51754.35131.61083.82733.32522.25272.78002.8445
H93.43901.08152.15922.72654.01892.59393.64623.82731.75322.47931.76554.2784
H102.80191.08672.16332.81963.83713.05442.51783.32521.75323.04901.76133.9057
H112.05612.14051.08792.08612.85632.81082.89042.25272.47933.04902.47462.7555
H122.78371.08572.15473.46494.50723.86722.89542.78001.76551.76132.47464.3853
H132.03853.71042.32081.85270.94852.94172.50752.84454.27843.90572.75554.3853

picture of Alanine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C2 115.153 N1 C3 C4 109.994
N1 C3 H11 106.784 C2 C3 C4 111.242
C2 C3 H11 108.807 C3 N1 H7 111.075
C3 N1 H8 111.253 C3 C2 H9 110.662
C3 C2 H10 110.676 C3 C2 H12 110.057
C3 C4 O5 114.926 C3 C4 O6 122.755
C4 C3 H11 104.176 C4 O5 H13 108.516
O5 C4 O6 122.281 H7 N1 H8 107.385
H9 C2 H10 107.922 H9 C2 H12 109.110
H10 C2 H12 108.348
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.677      
2 C -0.417      
3 C -0.087      
4 C 0.604      
5 O -0.510      
6 O -0.448      
7 H 0.279      
8 H 0.283      
9 H 0.177      
10 H 0.140      
11 H 0.158      
12 H 0.132      
13 H 0.366      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  4.539 2.478 0.302 5.180
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -38.785 -0.986 -0.439
y -0.986 -37.520 -0.443
z -0.439 -0.443 -33.119
Traceless
 xyz
x -3.465 -0.986 -0.439
y -0.986 -1.568 -0.443
z -0.439 -0.443 5.033
Polar
3z2-r210.067
x2-y2-1.265
xy-0.986
xz-0.439
yz-0.443


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 6.559 0.256 0.073
y 0.256 6.970 -0.013
z 0.073 -0.013 5.257


<r2> (average value of r2) Å2
<r2> 0.000
(<r2>)1/2 0.000