Same head, different scaffold: a plethora of structural motifs assembled from silver(I) and ditopic 2,2′-bipyridine ligands

摘要: The condensation of ethane-1,2-diamine, propane-1,3-diamine, butane-1,4-diamine or hydrazine with two equivalents 2,2′-bipyridine-6-carbaldehyde in the presence AgBF4 leads to formation silver(I) complexes ligands 4–7 which differ length spacer linking 2,2′-bipyridine-6-carbaldimine domains (4, carbon spacers; 5, three carbons; 6, four 7, no spacer). For containing 4–7, respectively, single crystal X-ray diffraction confirms assembly a [2 + 2] double helicate, non-helical side-by-side dinuclear complex, an infinite coordination polymer and cyclic tetramer structure that is hybrid grid helicate. Face-to-face π-stacking between bpy plays dominant role helical [Ag2(4)2]2+, polymeric [Ag3(6)2]n3n+ [Ag4(7)4]4+ cations. However, [Ag2(5)2]2+ cation [Ag2(5)2][BF4]2·2MeCN exhibits face-to-face embraces, inter-cation packing controlled by CH⋯N CH⋯π interactions.