Preparation, solid-state characterization, and computational study of a crown ether attached to a squaramide.
[structure: see text] Crystals of a disecondary squaramide covalently linked to a crown ether presents a great variety of inter- and intramolecular nonbonded interactions including C-H/pi contacts, C-H...O and N-H...O hydrogen bonds, and pi-pi stacking between squaramide rings. Latter interaction, the stacking between squaramide rings, can be considered as an experimental evidence for the proposed aromaticity of squaramide when it is forming hydrogen bonds, either as acceptor or donor.
Frontera
Antonio
A
Department of Chemistry, Universitat de les Illes Balears, 07122 Palma de Mallorca, Spain. tony.frontera@uib.es
Orell
Maria
M
Garau
Carolina
C
Quiñonero
David
D
Molins
Elies
E
Mata
Ignasi
I
Morey
Jeroni
J