| Popis: |
Ground-state rotational spectra of a 1:1 complex of acetylene and bromine were observed with a Fourier-transform microwave spectrometer. Rotational, centrifugal distortion and Br nuclear hyperfine coupling constants were determined for the isotopomers C 2 H 2 ⋯ 79 Br 79 Br , C 2 H 2 ⋯ 79 Br 81 Br , C 2 H 2 ⋯ 81 Br 79 Br and C 2 H 2 ⋯ 81 Br 81 Br . The complex possesses a T-shaped, C2v geometry at equilibrium with a zero-point distance 3.144 A between the centre (∗) of the CC bond and the inner bromine atom. The inter- and intra-molecular electron transfers on complex formation are δ(∗→ Br i )e=0.010e and δ(Bri→Bro)e=0.037e, respectively, where i = inner and o = outer. The inter-molecular stretching force constant is k σ =7.80(6) N m −1 . |
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