R₁,R₂-C=Te

R₁

R₂

N_f

C=Te

C–N

N

N

10

2.070 (0.012)

1.358 (0.009)

N³

N³

10

2.070 (0.012)

1.358 (0.009)

N

C

3

2.056 (0.018)

1.316 (0.007)

N³

C³

2

2.062 (0.008)

1.313 (0.006)

N³

C⁴

1

2.045

1.322

C

C

–

–

–