CH3-HC=CH-CH2CN














 









Nitrogen


Nuclear Quadrupole Coupling Constants


in trans 3-Pentenenitrile



 


















Calculations of the nitrogen nqcc tensors in trans 3-Pentenenitrile - syn and gauche - were made on approximate equilibrium structures, ~re given by MP2/6-311+G(3df,3pd) optimization with approximate equilibrium bond lengths.  These calculated nqcc's are compared with the experimental results [1] in Tables 1 and 2.  Structure parameters are given in Table 3,  rotational constants in Table 4.

 








syn


 gauche
















































In Tables 1 and 2, subscripts a,b,c refer to the principal axes of the inertia tensor; x,y,z to the principal axes of the nqcc tensor.  ETA = (Xxx - Xyy)/Xzz.  Ø (degrees) is the angle between its subscripted parameters.  RMS is the root mean square difference between calculated and experimental diagonal nqcc's (percentage of the average of the magnitudes of the experimental nqcc's).  RSD is the calibration residual standard deviation for the B3PW91/6-311+G(df,pd) model for calculation of the nitrogen  efg's/nqcc's.

 








 









   







Table 1.  Nitrogen nqcc's in syn conformer of trans 3-Pentenenitrile (MHz).  Calculation was made on ~re structure.

   










Calc

Exp [1]
   






14N Xaa
0.345





Xbb -
2.389





Xcc
2.044





Xab
2.899













RMS







RSD

0.030 (1.3 %)












Xxx
2.183





Xyy
2.044




Xzz -
4.227





ETA

0.0329





Øz,a

122.38





Øa,CN
121.82





Øz,CN
    0.56




 








 









 








 
   







Table 2.  Nitrogen nqcc's in gauche conformer of trans 3-Pentenenitrile (MHz).  Calculation was made on ~re structure.
   










Calc

Exp [1]
   






14N Xaa -
1.604





Xbb -
0.492





Xcc
2.096





Xab -
3.093





Xac -
0.141





Xbc -
0.230













RMS







RSD

0.030 (1.3 %)












Xxx
2.187





Xyy
2.015




Xzz -
4.201





ETA

0.0410





Øz,CN
0.31













 








 













Table 3. trans 3-Pentenenitrile:  MP2/6-311+G(3df,3pd) optimized structure parameters, with ~re bond lengths given in parentheses.





 C
 C,1,B1
 C,2,B2,1,A1
 C,3,B3,2,A2,1,D1,0
 C,4,B4,3,A3,2,D2,0
 N,5,B5,4,A4,3,D3,0
 H,1,B6,2,A5,3,D4,0
 H,1,B7,2,A6,3,D5,0
 H,1,B8,2,A7,3,D6,0
 H,2,B9,1,A8,3,D7,0
 H,3,B10,2,A9,1,D8,0
 H,4,B11,3,A10,2,D9,0
 H,4,B12,3,A11,2,D10,0
          syn







 B1=1.49453231     (1.4937)
 B2=1.33402785     (1.3310)
 B3=1.50622949     (1.5048)
 B4=1.45873679     (1.4596)
 B5=1.16937136     (1.1561)
 B6=1.09001956
 B7=1.08833597
 B8=1.09001956
 B9=1.08569321
 B10=1.08492096
 B11=1.09170647
 B12=1.09170647
 A1=124.00847177
 A2=125.37094748
 A3=113.01656772
 A4=178.74333942
 A5=110.68875012
 A6=111.41607157
 A7=110.68875012
 A8=117.2284671
 A9=119.76460987
 A10=110.20689354
 A11=110.20689354
 D1=180.
 D2=0.
 D3=0.
 D4=-120.74815847
 D5=0.
 D6=120.74815847
 D7=180.
 D8=0.
 D9=121.32542973
 D10=-121.32542973







************


 



 C
 C,1,B1
 C,2,B2,1,A1
 C,3,B3,2,A2,1,D1,0
 C,4,B4,3,A3,2,D2,0
 N,5,B5,4,A4,3,D3,0
 H,1,B6,2,A5,3,D4,0
 H,1,B7,2,A6,3,D5,0
 H,1,B8,2,A7,3,D6,0
 H,2,B9,1,A8,3,D7,0
 H,3,B10,2,A9,1,D8,0
 H,4,B11,3,A10,2,D9,0
 H,4,B12,3,A11,2,D10,0
               gauche









 B1=1.49405078     (1.4933)
 B2=1.33446374     (1.3314)
 B3=1.50384274     (1.5026)
 B4=1.46362465     (1.4643)
 B5=1.16953893     (1.1562)
 B6=1.09004778
 B7=1.08806573
 B8=1.09002679
 B9=1.08633401
 B10=1.08485267
 B11=1.09154273
 B12=1.08987698
 A1=124.38081373
 A2=123.31867769
 A3=111.50374553
 A4=178.94435196
 A5=110.8571219
 A6=111.18011141
 A7=110.69543409
 A8=117.12516833
 A9=120.03398843
 A10=110.78214688
 A11=110.36678243
 D1=179.75382728
 D2=119.4984223
 D3=17.41286252
 D4=-120.62794703
 D5=0.08998287
 D6=120.64390148
 D7=-179.88110429
 D8=-0.57587513
 D9=-120.46380133
 D10=-1.44099491









 













Table 4trans 3-Pentenenitrile, Rotational Constants (MHz).

 





   ~re    Expt [1]






syn Conformer
A   8128.



B   1970.



C   1617.







gauche Conformer
A
 12433.


B
   1507.


C
   1422.


 








 








[1]  P.Mishra, S.Fritz, B.M.Hays, and T.S.Zwier, Abstract WI06, 74th ISMS, Champaign-Urbana, Illinois, 2019.












J.R.Durig, T.K.Gounev, H.Zhen, A.Drew, S.Shen, G.A.Guirgis, J.Mol.Struct. 553,221(2000).






















4-Pentenenitrile







 









 








Table of Contents




Molecules/Nitrogen




 








 













t3PN.html






Last Modified 24 April 2019