Crystallization of N-chlorosaccharin with quinuclidine (QN) produced QN-Cl+ cations showing a covalent bond between chlorine and a tertiary nitrogen atom. Strong (supramolecular) halogen bonds between the QN-Cl+ and Cl− anions in their 2 : 1 and 1 : 1 complexes comprise a large contribution of orbital (covalent) interactions.
M. Hardin, M. Zeller and S. V. Rosokha, CrystEngComm, 2024, 26, 6784 DOI: 10.1039/D4CE01053A
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