No abstract

Hydrogen bonding from a urea group to hydrogen bond acceptor anions can adopt either R 1 2 (6) or R 2 2 (8) motifs depending on the proximity of hydrogen bond acceptor atoms. However, for the sterically bulky and weaker hydrogen bond acceptor triflate anion, hydrogen bond acceptor polymorphism is observed. CrystEngCommThis journal is

The interplay of anion binding, intra- and intermolecular hydrogen boning patterns in a range of receptors and sensors for chloride anion are discussed.