Planar Ni(II), Cu(II) and Co(II) tetraaza[14]annulenes: Structural, electronic and magnetic properties and application to field effect transistors

Alexander M. Whyte, Yoshiaki Shuku, Gary S. Nichol, Michio M. Matsushita, Kunio Awaga, Neil Robertson

Research output: Contribution to journalArticlepeer-review

Abstract

A series of planar Ni(II), Cu(II) and Co(II) tetraaza[14]annulenes has been prepared and studied optically, electrochemically and magnetically. Thin films of each of these complexes have been prepared by vacuum deposition to evaluate the field-effect transistor (FET) performance as well as the morphology and crystallinity of the film formed. The electrochemistry and UV/Vis absorption studies indicate the materials are redox active and highly coloured, with molar extinction coefficients as large as 80 000 M-1 cm-1 in the visible region. The paramagnetic complexes display weak antiferromagnetic interactions, fit to the Bonner-Fisher chain model. Each of the materials formed polycrystalline films when vacuum deposited and showed field-effect transistor behaviour, with charge carrier mobilities in the range of 10-5 to 10-9 cm2 V-1 s-1. SEM imaging of the substrates indicates that the central metal ion, and its sublimation temperature, has a crucial role in defining the morphology of the resulting film.

Original languageEnglish
Pages (from-to)17967-17975
Number of pages9
JournalJournal of Materials Chemistry
Volume22
Issue number34
Early online date30 Jul 2012
DOIs
Publication statusPublished - 14 Sep 2012

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