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IV.C.1. (XIII.D.1.)

Compare vibrational frequencies in CCCBDB for C2H2N4 (sym-tetrazine)

PBEPBE/6-31G**

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3095 85 Ag 3010  
2 Ag 1389 -26 Ag 1415  
3 Ag 997 -12 Ag 1009  
4 Ag 722 -14 Ag 736  
5 Au 269 -66 Au 335  
6 B1u 3094 8 B1u 3086  
7 B1u 1170 -34 B1u 1204  
8 B1u 1046 -47 B1u 1093  
9 B2g 945 -49 B2g 994  
10 B2g 788 -13 B2g 801  
11 B2u 1407 -41 B2u 1448  
12 B2u 1105 1 B2u 1104  
13 B2u 963 80 B2u 883  
14 B3g 1479 -46 B3g 1525  
15 B3g 1265 -25 B3g 1290  
16 B3g 616 -24 B3g 640  
17 B3u 875 -54 B3u 929  
18 B3u 109 -145 B3u 254  
The calculated vibrational frequencies were scaled by 0.9863

See section XIII.C.3 List or set vibrational scaling factors to change the scale factors used here.
See section III.B.3.c Calculate a vibrational scaling factor for a set of molecules to determine the least squares best scaling factor.
See section III.B.3.b List of vibrational scaling factors and their uncertainties for information on where the above scaling factor is from.