Issue 28, 2015

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

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

Supplementary files

Article information

Article type
Communication
Submitted
27 Mar 2015
Accepted
28 May 2015
First published
28 May 2015

Dalton Trans., 2015,44, 12484-12487

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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