Crystal structures of four co-crystals of (E)-1,2-di(pyridin-4-yl)ethene with 4-alk­oxy­benzoic acids: 4-meth­oxy­benzoic acid–(E)-1,2-di(pyridin-4-yl)ethene (2/1), 4-eth­oxy­benzoic acid–(E)-1,2-di(pyridin-4-yl)ethene (2/1), 4-n-propoxybenzoic acid–(E)-1,2-di(pyridin-4-yl)ethene (2/1) and 4-n-but­oxy­benzoic acid–(E)-1,2-di(pyridin-4-yl)ethene (2/1)

Acta Crystallographica Section E
Acta Crystallographica
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Figure 4
A partial packing diagram of compound (III)

, showing the two independent layers. H atoms not involved in the O—H⋯N hydrogen bonds (dashed lines) have been omitted.

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