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Tuning the Magnetic Properties of Columnar Benzo[ e ][1,2,4]triazin‐4‐yls with the Molecular Shape
Author(s) -
Jasiński Marcin,
Szymańska Katarzyna,
Gardias Anita,
Pociecha Damian,
Monobe Hirosato,
Szczytko Jacek,
Kaszyński Piotr
Publication year - 2019
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201800965
Subject(s) - homologous series , ferromagnetism , chemistry , antiferromagnetism , crystallography , phase (matter) , alkoxy group , materials science , condensed matter physics , alkyl , organic chemistry , physics
Abstract A homologous series of disc‐like 1,3,6‐trisubstituted benzo[ e ][1,2,4]triazin‐4‐yls 1[n] was synthesized and their structural, thermal, optical, magnetic, and electric properties were investigated. The results demonstrate that all members of the series display a Col h phase with clearing temperatures depending on the length of the alkoxy chains at the N(1) position, hence the shape of the disc. Powder XRD and magnetic data indicate a gradual change in the column diameter and magnetic behavior in the series in transition from half‐disc in 1[0] (antiferromagnetic interactions) to full‐disc geometry in the 1[12] homologue (ferromagnetic interactions with J / k B =+7.5 K). Studies of binary systems revealed that a 1 : 1 mixture of 1[0] and 1[12] exhibits modest stabilization of the Col h phase with an expanded range, and magnetic behavior typical for 1[0] in the rigid phase obtained from the melt. Electric measurements demonstrated hole mobility of ∼10 −3 cm 2 V −1 s −1 and dark conductivity of ∼10 −11 Scm −1 in the mixture and individual compounds. The latter is enhanced up to 4 times by simultaneous illumination with UV light.