Appropriately designed charged or neutral redox- and/or photo-active transition-metal organometallic and coordination receptor systems can selectively recognise and sense anionic guest species by electrochemical and/or optical methodologies. The topological positioning of the transition-metal Lewis-acid centres and of the ubiquitous hydrogen-bonding functionalities, such as amide (CO–NH) groups, dictates the anion selectivity trend and sensing proficiency the particular receptor displays.
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Paul D. Beer (1996) studied this question.
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