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Solvent‐Dependent Pseudopolymorphism of Tripyridoxycalix[4]arene: cone versus partial‐cone Conformation
Author(s) -
Dyker Gerald,
Mastalerz Michael,
Müller Iris M.,
Merz Klaus,
Koppe Karsten
Publication year - 2005
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/ejoc.200500643
Subject(s) - chemistry , solvent , molecule , hydrogen bond , intermolecular force , crystal structure , crystallography , clathrate hydrate , methanol , organic chemistry , hydrate
The preferred conformation of the tripyridoxycalixarene 1 in the crystalline state strongly depends on the applied solvents: The interaction with the clathrated solvent molecules influences the equilibrium between intra‐ and intermolecular hydrogen bonds and therefore the conformation of 1 . The paco ‐ 1 molecules form methanol‐containing channels; cone ‐ 1 crystallizes as a clathrate with ethyl acetate fixed in the lattice voids. The conformations and their interconversion were studied by X‐ray crystal structure analysis and DSC measurements. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)