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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: MP2/LANL2DZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at MP2/LANL2DZ
 hartrees
Energy at 0K-263.128004
Energy at 298.15K-263.133703
HF Energy-262.574106
Nuclear repulsion energy203.057194
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/LANL2DZ
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 Ag 3233 3114 0.00      
2 Ag 1530 1473 0.00      
3 Ag 1238 1192 0.00      
4 Ag 955 919 0.00      
5 Ag 598 576 0.00      
6 Au 867 835 0.00      
7 Au 334 322 0.00      
8 B1g 892 859 0.00      
9 B1u 3201 3083 3.63      
10 B1u 1468 1414 9.86      
11 B1u 1128 1086 0.33      
12 B1u 979 943 23.69      
13 B2g 886 853 0.00      
14 B2g 750 722 0.00      
15 B2u 3227 3108 59.67      
16 B2u 1398 1346 36.55      
17 B2u 1193 1149 11.29      
18 B2u 1045 1006 4.13      
19 B3g 3201 3083 0.00      
20 B3g 1480 1425 0.00      
21 B3g 1363 1313 0.00      
22 B3g 699 673 0.00      
23 B3u 770 741 53.93      
24 B3u 427 412 28.96      

Unscaled Zero Point Vibrational Energy (zpe) 16430.1 cm-1
Scaled (by 0.9631) Zero Point Vibrational Energy (zpe) 15823.9 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/LANL2DZ
ABC
0.20094 0.18843 0.09724

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/LANL2DZ

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.444
N2 0.000 0.000 -1.444
C3 0.000 1.173 0.713
C4 0.000 -1.173 0.713
C5 0.000 -1.173 -0.713
C6 0.000 1.173 -0.713
H7 0.000 2.102 1.287
H8 0.000 -2.102 1.287
H9 0.000 -2.102 -1.287
H10 0.000 2.102 -1.287

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.88851.38281.38282.45532.45532.10762.10763.44603.4460
N22.88852.45532.45531.38281.38283.44603.44602.10762.1076
C31.38282.45532.34682.74561.42511.09153.32503.83702.2042
C41.38282.45532.34681.42512.74563.32501.09152.20423.8370
C52.45531.38282.74561.42512.34683.83702.20421.09153.3250
C62.45531.38281.42512.74562.34682.20423.83703.32501.0915
H72.10763.44601.09153.32503.83702.20424.20334.92852.5733
H82.10763.44603.32501.09152.20423.83704.20332.57334.9285
H93.44602.10763.83702.20421.09153.32504.92852.57334.2033
H103.44602.10762.20423.83703.32501.09152.57334.92854.2033

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 121.946 N1 C3 H7 116.318
N1 C4 C5 121.946 N1 C4 H8 116.318
N2 C5 C4 121.946 N2 C5 H9 116.318
N2 C6 C3 121.946 N2 C6 H10 116.318
C3 N1 C4 116.107 C3 C6 H10 121.736
C4 C5 H9 121.736 C5 N2 C6 116.107
C5 C4 H8 121.736 C6 C3 H7 121.736
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability