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Figure 4
(a) Hydrogen-bonded chains of base and acid units in co-crystals of bis­(4-pyridyl)­ethene (BPE), and 1,2-bis­(4-pyridyl)­propane (BPP) with di­carb­oxy­lic acids with the total number (Cn) of carbon atoms in the diacid molecule ranging between 4 and 10 (hence the adducts are identified as BPY·Cn, BPA·Cn, BPE·Cn, and BPP·Cn). (b) Melting point alternation found the even–odd alternating pattern associated with the sequence glutaric, adipic, pimelic, suberic, azelaic and sebacic acid was reversed in co-crystals BPP.

IUCrJ
Volume 4| Part 4| July 2017| Pages 369-379
ISSN: 2052-2525
https://doi.org/10.1107/S2052252517005917