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: MP2=FULL/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 MP2=FULL/6-31G(2df,p)
 hartrees
Energy at 0K-323.072129
Energy at 298.15K-323.081727
HF Energy-321.897769
Nuclear repulsion energy251.640437
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=FULL/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 3668 3448 13.60      
2 A 3567 3353 1.98      
3 A 3520 3308 276.31      
4 A 3235 3041 2.69      
5 A 3208 3015 14.06      
6 A 3125 2937 8.83      
7 A 3116 2929 7.76      
8 A 1875 1762 227.44      
9 A 1682 1581 34.17      
10 A 1537 1445 12.81      
11 A 1529 1437 4.43      
12 A 1454 1367 381.13      
13 A 1431 1345 5.07      
14 A 1416 1331 10.35      
15 A 1346 1265 25.30      
16 A 1269 1192 10.72      
17 A 1238 1163 6.65      
18 A 1190 1118 6.44      
19 A 1129 1062 44.19      
20 A 1038 976 0.88      
21 A 965 907 43.92      
22 A 919 864 68.24      
23 A 883 830 94.46      
24 A 827 778 10.90      
25 A 751 706 7.40      
26 A 575 540 5.73      
27 A 542 509 0.64      
28 A 416 391 5.07      
29 A 365 343 16.50      
30 A 298 280 16.55      
31 A 286 269 15.78      
32 A 242 227 1.04      
33 A 72 68 1.41      

Unscaled Zero Point Vibrational Energy (zpe) 24357.3 cm-1
Scaled (by 0.9399) Zero Point Vibrational Energy (zpe) 22893.4 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=FULL/6-31G(2df,p)
ABC
0.16338 0.11781 0.07307

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-31G(2df,p)

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 1.071 1.338 -0.041
C2 1.436 -1.151 -0.195
C3 0.640 0.003 0.383
C4 -0.846 -0.158 0.057
O5 -1.474 1.001 -0.144
O6 -1.394 -1.228 0.015
H7 1.376 1.308 -1.007
H8 1.865 1.650 0.503
H9 1.010 -2.097 0.129
H10 1.399 -1.125 -1.284
H11 0.698 -0.019 1.474
H12 2.477 -1.099 0.119
H13 -0.758 1.669 -0.088

Atom - Atom Distances (Å)
  N1 C2 C3 C4 O5 O6 H7 H8 H9 H10 H11 H12 H13
N12.51991.46482.43302.56963.55871.01391.01103.43952.77842.06792.81791.8594
C22.51991.51662.50093.61972.83912.59022.91821.08691.09042.14741.08893.5741
C31.46481.51661.52942.39632.40632.04362.05562.14802.15191.09302.15902.2246
C42.43302.50091.52941.33351.20352.86623.28812.68532.78812.10013.45421.8341
O52.56963.61972.39631.33352.23612.99393.46213.98073.75222.89424.48270.9806
O63.55872.83912.40631.20352.23613.89234.37512.55953.08292.82263.87532.9674
H71.01392.59022.04362.86622.99393.89231.62333.60812.44882.89472.87662.3513
H81.01102.91822.05563.28813.46214.37511.62333.86153.33332.25672.84262.6883
H93.43951.08692.14802.68533.98072.55953.60813.86151.75892.49491.77434.1659
H102.77841.09042.15192.78813.75223.08292.44883.33331.75893.05361.76983.7268
H112.06792.14741.09302.10012.89422.82262.89472.25672.49493.05362.48372.7221
H122.81791.08892.15903.45424.48273.87532.87662.84261.77431.76982.48374.2626
H131.85943.57412.22461.83410.98062.96742.35132.68834.16593.72682.72214.2626

picture of Alanine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C2 115.372 N1 C3 C4 108.674
N1 C3 H11 106.993 C2 C3 C4 110.380
C2 C3 H11 109.680 C3 N1 H7 109.727
C3 N1 H8 110.920 C3 C2 H9 110.091
C3 C2 H10 110.190 C3 C2 H12 110.843
C3 C4 O5 113.477 C3 C4 O6 122.960
C4 C3 H11 105.207 C4 O5 H13 103.809
O5 C4 O6 123.544 H7 N1 H8 106.579
H9 C2 H10 107.771 H9 C2 H12 109.269
H10 C2 H12 108.606
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability