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: MP2/6-311G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A
Energy calculated at MP2/6-311G*
 hartrees
Energy at 0K-322.910634
Energy at 298.15K-322.920263
HF Energy-321.936370
Nuclear repulsion energy250.288251
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 MP2/6-311G*
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 3656 3475 7.78      
2 A 3556 3379 10.64      
3 A 3534 3358 203.94      
4 A 3198 3039 6.46      
5 A 3168 3010 23.78      
6 A 3095 2941 11.77      
7 A 3081 2928 12.69      
8 A 1860 1767 231.70      
9 A 1735 1648 47.79      
10 A 1537 1460 17.97      
11 A 1528 1452 4.30      
12 A 1466 1393 432.24      
13 A 1445 1373 10.90      
14 A 1426 1355 4.71      
15 A 1347 1280 18.20      
16 A 1271 1208 5.54      
17 A 1239 1178 12.02      
18 A 1185 1126 6.88      
19 A 1126 1071 61.56      
20 A 1041 990 0.95      
21 A 976 927 89.28      
22 A 926 880 52.71      
23 A 894 849 108.79      
24 A 821 780 12.38      
25 A 744 707 9.25      
26 A 569 540 6.97      
27 A 540 514 0.64      
28 A 417 397 5.25      
29 A 379 360 16.96      
30 A 310 295 12.33      
31 A 288 273 11.79      
32 A 247 234 1.20      
33 A 72 68 1.27      

Unscaled Zero Point Vibrational Energy (zpe) 24336.9 cm-1
Scaled (by 0.9503) Zero Point Vibrational Energy (zpe) 23127.3 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 MP2/6-311G*
ABC
0.16199 0.11615 0.07206

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-311G*

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 1.037 1.366 -0.091
C2 1.482 -1.124 -0.153
C3 0.642 0.028 0.377
C4 -0.847 -0.180 0.050
O5 -1.520 0.968 -0.103
O6 -1.355 -1.272 -0.027
H7 1.387 1.307 -1.043
H8 1.779 1.746 0.482
H9 1.089 -2.075 0.209
H10 1.452 -1.144 -1.246
H11 0.693 0.042 1.473
H12 2.522 -1.021 0.167
H13 -0.844 1.671 -0.004

Atom - Atom Distances (Å)
  N1 C2 C3 C4 O5 O6 H7 H8 H9 H10 H11 H12 H13
N12.53071.47122.44112.58843.56181.01501.01183.45422.79392.07792.82341.9073
C22.53071.52182.52143.66032.84422.59132.95441.09021.09422.15071.09263.6394
C31.47121.52181.53852.40612.41732.05062.06242.15672.16001.09682.16362.2470
C42.44112.52141.53851.33971.20702.89713.28502.71302.80952.10793.47431.8514
O52.58843.66032.40611.33972.24723.07403.44044.02013.82152.87004.51360.9807
O63.56182.84422.41731.20702.24723.89904.38082.58313.06332.85813.89042.9868
H71.01502.59132.05062.89713.07403.89901.63413.61842.46072.89972.85912.4870
H81.01182.95442.06243.28503.44044.38081.63413.89203.38292.25062.88232.6687
H93.45421.09022.15672.71304.02012.58313.61843.89201.76492.49691.77954.2197
H102.79391.09422.16002.80953.82153.06332.46073.38291.76493.06181.77663.8388
H112.07792.15071.09682.10792.87002.85812.89972.25062.49693.06182.48662.6818
H122.82341.09262.16363.47434.51363.89042.85912.88231.77951.77662.48664.3133
H131.90733.63942.24701.85140.98072.98682.48702.66874.21973.83882.68184.3133

picture of Alanine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C2 115.448 N1 C3 C4 108.381
N1 C3 H11 107.123 C2 C3 C4 110.955
C2 C3 H11 109.359 C3 N1 H7 109.770
C3 N1 H8 110.965 C3 C2 H9 110.216
C3 C2 H10 110.248 C3 C2 H12 110.627
C3 C4 O5 113.252 C3 C4 O6 122.946
C4 C3 H11 104.996 C4 O5 H13 104.796
O5 C4 O6 123.778 H7 N1 H8 107.456
H9 C2 H10 107.795 H9 C2 H12 109.221
H10 C2 H12 108.669
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability