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Structural and Magnetic Modulation of a Purely Organic Open Framework by Selective Guest Inclusion
Author(s) -
Maspoch Daniel,
Domingo Neus,
Roques Nans,
Wurst Klaus,
Tejada Javier,
Rovira Concepció,
RuizMolina Daniel,
Veciana Jaume
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200700353
Subject(s) - hydrogen bond , chemistry , solvent , adduct , molecule , benzoic acid , crystallography , antiferromagnetism , radical , acceptor , crystal engineering , phase (matter) , organic chemistry , physics , condensed matter physics
Solvent inclusion/evacuation caused variations in the structural and magnetic characteristics of the purely organic porous magnet based on the tricarboxylic‐substituted PTMTC radical. Whereas no inclusion is observed for nonpolar solvents, the exposure of crystals of the α‐phase of PTMTC to vapors of polar organic solvents with hydrogen acceptor and/or donor functionalities, such as, ethanol, benzoic alcohol, n ‐decanol, THF, and DMSO results in the inclusion of these solvents in the highly polar tubular channels of the α‐phase. The resulting inclusion compounds of formula PTMTC ⋅ x (guest) show several structural rearrangements, as confirmed by IR and XRPD (X‐ray powder diffraction) measurements. The crystal transformations have been studied for a specific case: the PTMTC ⋅ EtOH adduct. The crystal structure reveals that included guest solvent molecules participate in the formation of new hydrogen bonds with the carboxylic groups of PTMTC radicals, inducing the disruption of several direct hydrogen bonds among these radicals. As expected, the interruption of direct hydrogen bonds between PTMTC radicals induces large transformations in the magnetic properties. From the ferromagnetic behavior of the α‐phase, predominant antiferromagnetic interactions are observed for the inclusion adducts. Interestingly, both structural and magnetic changes are reversible after removal of guest solvent molecules.