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Host-mediated liquid–liquid extraction is a convenient method for the separation of inorganic salts. 

Bambusuril-containing ChemFET sensor membranes show excellent selectivity for HS⁻and inform on its placement in the Hofmeister series. 

The short C–H⋯S contacts found in available structural data for both small molecules and larger biomolecular systems suggest that such contacts are an often overlooked yet important stabilizing interaction. Moreover, many of these short C–H⋯S contacts meet the definition of a hydrogen bonding interaction. Using available structural data from the Cambridge Structural Database (CSD), as well as selected examples from the literature in which important C–H⋯S contacts may have been overlooked, we highlight the generality of C–H⋯S hydrogen bonding as an important stabilizing interaction. To uncover and establish the generality of these interactions, we compare C–H⋯S contacts with other traditional hydrogen bond donors and acceptors as well as investigate how coordination number and metal bonding affect the preferred geometry of interactions in the solid state. This work establishes that the C–H⋯S bond meets the definition of a hydrogen bond and serves as a guide to identify C–H⋯S hydrogen bonds in diverse systems. 

We highlight a convenient synthesis to selectively deuterate an aryl C–H hydrogen bond donor in an arylethynyl bisurea supramolecular anion receptor and use the Perrin method of competitive titrations to study the deuterium equilibrium isotope effects (DEIE) of anion binding for HS − , Cl − , and Br − . This work highlights the utility and also challenges in using this method to determine EIE with highly reactive and/or weakly binding anions. 

Synthetic supramolecular receptors have been widely used to study reversible solution binding of anions; however, few systems target highly-reactive species. In particular, the hydrochalcogenide anions hydrosulfide (HS − ) and hydroselenide (HSe − ) have been largely overlooked despite their critical roles in biological systems. Herein we present the first example of reversible HSe − binding in two distinct synthetic supramolecular receptors, using hydrogen bonds from N–H and aromatic C–H moieties. The arylethynyl bisurea scaffold 1tBu achieved a binding affinity of 460 ± 50 M −1 for HSe − in 10% DMSO- d 6 /CD 3 CN, whereas the tripodal-based receptor 2CF3 achieved a binding affinity of 290 ± 50 M −1 in CD 3 CN. Association constants were also measured for HS − , Cl − , and Br − , and both receptors favored binding of smaller, more basic anions. These studies contribute to a better understanding of chalcogenide hydrogen bonding and provide insights into further development of probes for the reversible binding, and potential quantification, of HSe − and HS − .