Fourfold hydrogen donors or acceptors for hydrogen bonding, the diprotonated bisamidine 1-2H2+ and the deprotonated fumaric acid 22−, cocrystallize to form one-dimensional α-networks when the ratio of 1-2H+ to 22− is 1 : 1 and two-dimensional β-networks when the ratio is 1 : 2.
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Félix et al. (1997) studied this question.
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