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Issue 28, 2015
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A mononuclear Ni(ii) complex: a field induced single-molecule magnet showing two slow relaxation processes

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Abstract

The mononuclear complex [Ni(pydc)(pydm)]·H2O, pyridine-2,6-dicarboxylato-2,6-bis(hydroxymethyl)pyridine nickel(II) monohydrate, features a highly axially compressed pseudo-octahedral chromophore with significant rhombic contribution that is responsible for the sizable magnetic anisotropy of the Ni(II) ion, D/hc ≈ −14 cm−1. This complex displays superparamagnetic behaviour in an applied external field that culminates at BDC = 0.2 T. Two relaxation processes are evidenced; the faster can be analyzed in terms of the Orbach, direct, and Raman processes yielding U/kB = 21.2 (±1.3) K and τ0 = 3.83 (±1.21) × 10−7 s. This is the first example of a field-induced single-molecule magnet in the class of hexacoordinate Ni(II) complexes.

Graphical abstract: A mononuclear Ni(ii) complex: a field induced single-molecule magnet showing two slow relaxation processes

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Supplementary files

Article information


Submitted
27 Mar 2015
Accepted
28 May 2015
First published
28 May 2015

Dalton Trans., 2015,44, 12484-12487
Article type
Communication

A mononuclear Ni(II) complex: a field induced single-molecule magnet showing two slow relaxation processes

J. Miklovič, D. Valigura, R. Boča and J. Titiš, Dalton Trans., 2015, 44, 12484 DOI: 10.1039/C5DT01213A

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