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All results from a given calculation for C4H4N2 (1,3-Diazine)

using model chemistry: HF/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at HF/3-21G
 hartrees
Energy at 0K-261.206190
Energy at 298.15K-261.212501
Nuclear repulsion energy210.199511
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/3-21G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 3419 3096 5.27      
2 A1 3413 3090 20.67      
3 A1 3378 3060 3.35      
4 A1 1722 1559 36.12      
5 A1 1548 1402 95.67      
6 A1 1262 1142 9.00      
7 A1 1173 1062 0.44      
8 A1 1079 977 2.78      
9 A1 772 700 6.48      
10 A2 1161 1051 0.00      
11 A2 490 444 0.00      
12 B1 1216 1101 1.36      
13 B1 1145 1037 0.61      
14 B1 949 860 8.96      
15 B1 837 758 68.47      
16 B1 447 405 4.98      
17 B2 3384 3065 25.29      
18 B2 1720 1558 79.68      
19 B2 1627 1474 21.36      
20 B2 1524 1380 1.31      
21 B2 1350 1222 10.26      
22 B2 1176 1065 2.16      
23 B2 1124 1018 1.43      
24 B2 707 640 17.06      

Unscaled Zero Point Vibrational Energy (zpe) 18311.0 cm-1
Scaled (by 0.9056) Zero Point Vibrational Energy (zpe) 16582.5 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/3-21G
ABC
0.20991 0.20759 0.10437

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/3-21G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.348
C2 0.000 0.000 -1.324
C3 0.000 1.178 0.625
C4 0.000 -1.178 0.625
N5 0.000 1.176 -0.707
N6 0.000 -1.176 -0.707
H7 0.000 0.000 2.417
H8 0.000 0.000 -2.391
H9 0.000 2.132 1.110
H10 0.000 -2.132 1.110

Atom - Atom Distances (Å)
  C1 C2 C3 C4 N5 N6 H7 H8 H9 H10
C12.67271.38191.38192.36792.36791.06893.73982.14482.1448
C22.67272.27782.27781.32871.32873.74161.06703.23593.2359
C31.38192.27782.35541.33202.70482.14433.23851.07013.3446
C41.38192.27782.35542.70481.33202.14433.23853.34461.0701
N52.36791.32871.33202.70482.35293.33812.05482.05273.7741
N62.36791.32872.70481.33202.35293.33812.05483.77412.0527
H71.06893.74162.14432.14433.33813.33814.80872.50032.5003
H83.73981.06703.23853.23852.05482.05484.80874.09954.0995
H92.14483.23591.07013.34462.05273.77412.50034.09954.2631
H102.14483.23593.34461.07013.77412.05272.50034.09954.2631

picture of 1,3-Diazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 N5 121.494 C1 C3 H9 121.503
C1 C4 N6 121.494 C1 C4 H10 121.503
C2 N5 C3 117.757 C2 N6 C4 117.757
C3 C1 C4 116.904 C3 C1 H7 121.548
C4 C1 H7 121.548 N5 C2 N6 124.594
N5 C2 H8 117.703 N5 C3 H9 117.004
N6 C2 H8 117.703 N6 C4 H10 117.004
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.388 -0.756   -0.861
2 C 0.340 0.942   0.958
3 C 0.139 0.701   0.726
4 C 0.139 0.701   0.726
5 N -0.652 -0.884   -0.903
6 N -0.652 -0.884   -0.903
7 H 0.259 0.223   0.265
8 H 0.274 -0.049   -0.039
9 H 0.271 0.003   0.016
10 H 0.271 0.003   0.016


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 2.511 2.511
CHELPG 0.000 0.000 2.502 2.502
AIM        
ESP 0.000 0.000 2.521 2.521


Electric Quadrupole moment
Quadrupole components in D Å


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.193 0.000 0.000
y 0.000 7.331 0.000
z 0.000 0.000 8.068


<r2> (average value of r2) Å2
<r2> 114.095
(<r2>)1/2 10.682