AUTHOR=Avilés–Moreno Juan Ramón , Berden Giel , Oomens Jos , Martínez–Haya Bruno TITLE=A Cl− Hinge for Cyclen Macrocycles: Ionic Interactions and Tweezer–Like Complexes JOURNAL=Frontiers in Chemistry VOLUME=7 YEAR=2019 URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2019.00143 DOI=10.3389/fchem.2019.00143 ISSN=2296-2646 ABSTRACT=
The supramolecular networks derived from the complexation of polyazamacrocycles with halide anions constitute fundamental building blocks of a broad range of modern materials. This study provides insights into the conformational framework that supports the binding of protonated cyclen macrocyles (1,4,7,10-Tetraazacyclododecane) by chloride anions through NHδ+···Cl− interactions. The isolated complex comprised of two cyclen hosts linked by one Cl− anion is characterized by means of infrared action spectroscopy and ion mobility mass spectrometry, in combination with quantum chemical computations. The Cl− anion is found to act as a hinge that bridges the protonated