Anion complexes between a macrocyclic cyclophane and squaric acid: The crystal structure reveals the ideal receptor topology ordered by the substrate

Michele Cesario Laboratoire de Cristallochimie, Institut de Chimie des Substances Naturelles, C.N.R.S., 91198, Gif-sur-Yvette, France

Jean Guilhem Laboratoire de Cristallochimie, Institut de Chimie des Substances Naturelles, C.N.R.S., 91198, Gif-sur-Yvette, France

Claudine Pascard Laboratoire de Cristallochimie, Institut de Chimie des Substances Naturelles, C.N.R.S., 91198, Gif-sur-Yvette, France

Abstract

The expected [1:2] complex between a tetraprotonated tetraazapara-cyclophane and squaric acid is not formed and the ligand undergoes drastic deformation. The peculiar features of this structure is the coexistence, in the same crystal cell, of 2 types of crystal lattice inclusions, corresponding to 2 different dissociation modes of squaric acid.

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Anion complexes between a macrocyclic cyclophane and squaric acid: The crystal structure reveals the ideal receptor topology ordered by the substrate

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Anion complexes between a macrocyclic cyclophane and squaric acid: The crystal structure reveals the ideal receptor topology ordered by the substrate

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