N-B Vibration of 1:1 EDA Complexes of N-Aromatic Heterocyclic Molecules with BCl3

(The vibration is basically the shifted ring breathing mode of the free azine)

Pyridine-BCl3(N-B =1.63Å) (KEDA =1.33x104 M-1 )

N-B vib. calc. 1160 cm-1

(Expt. 1107 cm-1)

Quinoline-BCl3(N-B=1.62Å) (KEDA =4.4 x 103 M-1 )

N-B vib. calc. 929 cm-1

(Expt. 994 cm-1)

Acridine-BCl3 (N-B=1.62Å) (KEDA=1.40 x 105 M-1 )

N-B vib. calc. 1469 cm-1
(also 1496 and 1530 cm-1 )

(Expt. intense triplet
1380-1470 cm-1)

 

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