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Anionic guest-dependent slow magnetic relaxation in Co(II) tripodal iminopyridine complexes

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Abstract

We report the syntheses and magnetic property characterizations of four mononuclear cobalt(II) complex salts featuring a tripodal iminopyridine ligand with external anion receptor groups, [CoL5-ONHtBu]X2 (X = Cl (1), Br (2), I (3) and ClO4 (4)). While all four salts exhibit anion binding through pendant amide moieties, only in the case of 1 is field-induced slow relaxation of magnetisation observed, whereas in the other salts this phenomenon is absent at the limits of our instrumentation. The effect of chloride inducing a seventh Co–N interaction and concomitant structural distortion is hypothesized as the origin of the observed dynamic magnetic properties observed in 1. Ab initio computational studies carried out on a 7-coordinate Co(II) model species survey the complex interplay of coordination number and trigonal twisting on the sign and magnitude of the axial anisotropy parameter (D), and identify structural features whose distortions can trigger large switches in the sign and magnitude of magnetic anisotropy.

Graphical abstract: Anionic guest-dependent slow magnetic relaxation in Co(ii) tripodal iminopyridine complexes

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Publication details

The article was received on 18 Feb 2019, accepted on 24 Feb 2019 and first published on 25 Feb 2019


Article type: Paper
DOI: 10.1039/C9DT00739C
Citation: Dalton Trans., 2019, Advance Article

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    Anionic guest-dependent slow magnetic relaxation in Co(II) tripodal iminopyridine complexes

    C. M. Klug, T. J. Ozumerzifon, I. Bhowmick, B. N. Livesay, A. K. Rappé and M. P. Shores, Dalton Trans., 2019, Advance Article , DOI: 10.1039/C9DT00739C

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