title: Substituent-Dependent Magnetic Behavior of Discotic Benzo[e][1,2,4]triazinyls.
abstract: Discotic mesogens containing the benzo[e][1,2,4]triazinyl radical as the central unit exhibit a Colh phase below 80 °C. Depending on the substituent at the N(1) position, they show different modes of thermal expansion and magnetic behavior, presumably due to differences in molecular organization. Thus, for 1-phenyl (1a) and 1-PhF-m (1b) derivatives, the Colh phase has positive thermal expansion coefficient κ and antiferromagnetic interactions, while for the 1-(3,4,5-(C12H25X)3C6H2) derivatives 1c (X = O) and 1d (X = S), κ is negative and weak ferromagnetic interactions in the crystalline phase are observed for 1c (J/kB = +4.76 K). Compounds 1a and 1c exhibit photoinduced hole transport (μ ≈ 1.3 × 10(-3) cm(2) V(-1) s(-1)) in the Colh phase.
authors.affiliation: Faculty of Chemistry, University of Łódź , Tamka 12, 91-403 Łódź, Poland.
authors.forename: Marcin
authors.initials: M
authors.lastname: Jasiński
authors.affiliation: Institute of Experimental Physics, Faculty of Physics, University of Warsaw , Pasteura 5, 02-093 Warsaw, Poland.
authors.forename: Jacek
authors.initials: J
authors.lastname: Szczytko
authors.affiliation: Department of Chemistry, University of Warsaw , Żwirki i Wigury 101, 02-089 Warsaw, Poland.
authors.forename: Damian
authors.initials: D
authors.lastname: Pociecha
authors.affiliation: National Institute of Advanced Industrial Science and Technology (AIST) , Kansai Centre, Ikeda, Osaka 563-8577, Japan.
authors.forename: Hirosato
authors.initials: H
authors.lastname: Monobe
authors.affiliation: Faculty of Chemistry, University of Łódź , Tamka 12, 91-403 Łódź, Poland.|Center for Molecular and Macromolecular Studies, Polish Academy of Sciences , Sienkiewicza 112, 90-363 Łódź, Poland.|Department of Chemistry, Middle Tennessee State University , Murfreesboro, Tennessee 37-132, United States.
authors.forename: Piotr
authors.initials: P
authors.lastname: Kaszyński