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Self‐Assembled Fibers Containing Stable Organic Radical Moieties: Alignment and Magnetic Properties in Liquid Crystals
Author(s) -
Eimura Hiroki,
Umeta Yoshikazu,
Tokoro Hiroko,
Yoshio Masafumi,
Ohkoshi Shinichi,
Kato Takashi
Publication year - 2016
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.201505213
Subject(s) - squid , intermolecular force , radical , liquid crystal , moiety , hydrogen bond , antiferromagnetism , chemistry , materials science , chemical engineering , crystallography , organic chemistry , molecule , ecology , physics , optoelectronics , engineering , biology , condensed matter physics
Macroscopically oriented stable organic radicals have been obtained by using a liquid–crystalline (LC) gel composed of an l ‐isoleucine‐based low molecular weight gelator containing a 2,2,6,6‐tetramethylpiperidine 1‐oxyl moiety. The LC gel has allowed magnetic measurements of the oriented organic radical. The gelator has formed fibrous aggregates in liquid crystals via intermolecular hydrogen bonds. The fibrous aggregates of the radical gelator are formed and oriented on cooling by applying a magnetic field to the mixture of liquid crystals and the gelator. Superconducting quantum interference device (SQUID) measurements have revealed that both oriented and nonoriented fibrous aggregates exhibited antiferromagnetic interactions, in which super‐exchange interaction constant J is estimated as −0.89 cm −1 .