The pronounced melting point alternation of α,ω-alkanedicarboxylic acids (HOOC–(CH2)n−2–COOH, n = 4–10) is maintained in co-crystals of the same acids with 1,2-bis(4-pyridyl)ethane (BPA), which contains an even number of carbon atoms in the chain, and is reversed in co-crystals with 1,2-bis(4-pyridyl)propane (BPP), which contains an odd number of carbon atoms in the aliphatic chain.
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Braga et al. (2010) studied this question.
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