An attractive couple: (Pro2H+)2(TCNQ.−)2⋅TCNQ (TCNQ=tetracyanoquinodimethane) contains an H-bonding network that supports a layered structure, composed of alternating TCNQ anions and proline cations (see picture). The cation is formed by two zwitterionic proline amino acids supported by a proton bridge between the carboxylates, whereas the anionic component involves a neutral TCNQ molecule sandwiched between two TCNQ.−.
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Qu et al. (2011) studied this question.
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