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A doubly-interlocked [2]catenane – or Solomon link – undergoes a complex conformational change upon addition of sulfate in methanol. This transformation generates a single pocket where two SO42− anions bind through multiple hydrogen bonds and electrostatic interactions. Despite the close proximity of the two anions, binding is highly cooperative. [ABSTRACT FROM AUTHOR]

Single crystal X-ray analyses show that iodine in pyridinium periodates acts as a halogen bond (HaB) donor forming short and almost linear contacts with neutral and anionic electron donors. A combination of QTAIM and NCIplot computational tools proves the attractive nature of these contacts. [ABSTRACT FROM AUTHOR]

Herein we report the experimental observation (X-ray characterization) of two different binding modes in H-bonded anion–anion complexes (anion = citrate) in N-(1-(2-phenylethyl)-4-piperidinylium)-N-phenyl-propanamide-citrate (fentanyl citrate). High level DFT calculations indicate that both types of anion–anion complexes (one with two and the other with four H-bonds) are thermodynamically unstable but kinetically stable with respect to the isolated anions with activation barriers as high as 14 kcal mol−1. [ABSTRACT FROM AUTHOR]

Bis-pyridazine tectons support the structure of metallosupramolecular cavitand Cu2L44+, which is capable of selective encapsulation of SiF62− anions by a set of multiple host–guest interactions. [ABSTRACT FROM AUTHOR]