Figure 1
Experimental bond lengths (Å) and angles (°) for the bipyridine species in (a) solid 2,2′-bipyridine (Merritt & Schroeder, 1956; s.u.'s not given), (b) the 2,2′-pyridylpyridinium cation (Lipkowski et al., 1976) and (c) the 2,2′-bipyridinium dication (present work). |