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Fine tuning of π-stack separation distances of semiquinone radicals affects their magnetic and electric properties

Molčanov, Krešimir; Stilinović, Vladimir; Šantić, Ana; Maltar-Strmečki, Nadica; Pajić, Damir; Kojić-Prodić, Biserka (2016) Fine tuning of π-stack separation distances of semiquinone radicals affects their magnetic and electric properties. Crystal Growth and Design, 16 (9). pp. 4777-4782. ISSN 1528-7483

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Two salts of tetrachloro- (chloranil, Cl4Q) and tetrabromosemiquinone (bromanil, Br4Q) radical anions with an organic cation N- methylpyridinium (N-MePy), displaying a variety of tunable electrical and magnetic properties, are characterized. These systems comprise π- stacks of equidistant semiquinone radical anions, without Peierls deformation and diamagnetic spin coupling. Both are stable up to 150 and 120°C in air, respectively, and are semiconductors with conductivities of 10-6 – 10-7 (Ohm cm)-1 in the single crystals. The room-temperature concomitant crystallization of two polymorphs with different magnetic properties (antiferromagnetic and Peierls- distorted diamagnetic) has been observed for Cl4Q∙N-MePy. The semiquinone radical organic salts represent a novel class of potential (multi)functional materials with tunable properties.

Item Type: Article
Uncontrolled Keywords: semiquinone; crystal engineering; spin coupling; Peierls deformation; semiconductivity
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Physical Chemistry
Project titleProject leaderProject codeProject type
Karakterizacija niskotemperaturne molekulske dinamike sustava s neuređenom rešetkom metodom ESR-DESiReMarina Ilakovac KvederIP-11-2013-1108HRZZ
Multiferični i magnetoelektrični sustavi-FerMaElDamir PajićUIP-09-2014-8276HRZZ
Novi metal-organsi sustavi s oksalatnim i kinoidnim ligandima s podešenim svojstvima pogodnim za primjenu-NMOSBOQLWTPSFPKrešimir MolčanovIP-09-2014-4079HRZZ
Depositing User: Nadica Maltar Strmečki
Date Deposited: 15 Dec 2016 13:30
DOI: 10.1021/acs.cgd.6b00675

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