Crystal structures of three co-crystals of 4,4′-bipyridyl with 4-alk­oxy­benzoic acids: 4-eth­oxy­benzoic acid–4,4′-bipyridyl (2/1), 4-n-propoxybenzoic acid–4,4′-bipyridyl (2/1) and 4-n-but­oxy­benzoic acid–4,4′-bipyridyl (2/1)

Acta Crystallographica Section E
Acta Crystallographica
Section E CRYSTALLOGRAPHIC COMMUNICATIONS

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Figure 8
A packing diagram of compound (III)

viewed along the a axis, showing a layer aggregate. H atoms not involved in the O—H⋯N hydrogen bonds (dashed lines) have been omitted.

CRYSTALLOGRAPHIC
COMMUNICATIONS

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