4.5 Article

Tuning the Magnetic Properties of Columnar Benzo[e][1,2,4]triazin-4-yls with the Molecular Shape

Journal

CHEMPHYSCHEM
Volume 20, Issue 4, Pages 636-644

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201800965

Keywords

columnar phase; liquid crystals; magnetic properties; stable radicals; synthesis

Funding

  1. FNP [TEAM-3/2016-3/24]
  2. National Science Center of Poland [2013/09/B/ST5/01230, 2013/11/B/ST3/04193, 2014/13/B/ST5/04525]

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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 similar to 10(-3) cm(2) V-1 s(-1) and dark conductivity of similar to 10(-11) Scm(-1) in the mixture and individual compounds. The latter is enhanced up to 4 times by simultaneous illumination with UV light.

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