New Adducts of Triphenylboroxine and Bis-pyridines: Syntheses and Crystal Structures of (Ph3B3O3)(η1-4,4′-bpy), (Ph3B3O3)2(μ-4,4′-bpy) and (Ph3B3O3)2(μ-bpe)

The treatment of phenylboronic acid PhB(OH)(2) with 4,4'-bipyridine (4,4'-bpy) in a 3:1 ratio afforded adduct [(Ph3B3O3)(eta(1)-4,4'-bpy)] (1), whereas the reaction of PhB(OH)(2) with 4,4'-bpy in a 6:1 ratio afforded adduct [(Ph3B3O3)(2)(mu-4,4'-bpy)] (2). Similarly, the reaction of PhB(OH)(2) with trans-1,2-bis(4-pyridyl)ethylene (bpe) in a 6:1 ratio gave bpe bridged adduct [(Ph3B3O3)(2)(mu-bpe)] (3). The crystal structures of 1 center dot 1/2C(6)H(6), 2 center dot 2C(7)H(8), 2 center dot C6H14, and 3 center dot C6H6, along with other spectroscopic properties are reported. The weak N center dot center dot center dot H-C hydrogen-bonds exist in the one-dimensional chains of 1 center dot A1/2C(6)H(6). Graphical Abstract Treatment of PhB(OH)(2) with 4,4'-bpy or bpe under different conditions afforded three new adducts [(Ph3B3O3)(eta(1)-4,4'-bpy)] (1), [(Ph3B3O3)(2)(mu-4,4'-bpy)] (2) and [(Ph3B3O3)(2)(mu-bpe)] (3) through the B-N dative bonds. [GRAPHICS] .