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Bis-amidinium calix[4]arene receptors were shown to coordinate bis-carboxylate anions in DMSO solution; the crystal structure of the malonate salt of one of the receptors revealed a number of different amidinium–carboxylate interactions, demonstrating the propensity of these species to form complex hydrogen bonding networks.

Solid-state and solution studies of bis-carboxylate binding by bis-amidinium calix[4]arenes†