Table 1 Methyl group rotational activation energy for each compound derived from the T1 relaxation experiments

From: Halogen bonding as a supramolecular dynamics catalyst

Compound

I···N/H···N bond length (Å)

Activation energy (kJ mol−1)

Note

1

3.0665(18)

2.84 ± 0.14

Halogen bonded

2

2.993(3)

3.24 ± 0.13

Halogen bonded

3

3.075(5)

3.62 ± 0.13

Halogen bonded

4

1.919

4.17 ± 0.09

Hydrogen bonded

5

1.809

5.02 ± 0.06

Hydrogen bonded

6

n/a

7.31 ± 0.17

Pure TMP

7

n/a

6.81 ± 0.16

HCl salt

8

n/a

13.64 ± 0.45

HBr salt

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