Journal article

Effect of N-4-Substituent Choice on Spin Crossover in Dinuclear Iron(II) Complexes of Bis-Terdentate 1,2,4-Triazole-Based Ligands

Jonathan A Kitchen, Juan Olguin, Rafal Kulmaczewski, Nicholas G White, Victoria A Milway, Guy NL Jameson, Jeffery L Tallon, Sally Brooker

INORGANIC CHEMISTRY | AMER CHEMICAL SOC | Published : 2013

Abstract

Seven new dinuclear iron(II) complexes of the general formula [Fe(II)2(PMRT)2](BF4)4·solvent, where PMRT is a 4-substituted-3,5-bis{[(2-pyridylmethyl)-amino]methyl}-4H-1,2,4-triazole, have been prepared in order to investigate the substituent effect on the spin crossover event. Variable temperature magnetic susceptibility and (57)Fe Mössbauer spectroscopy studies show that two of the complexes, [Fe(II)2(PMPT)2](BF4)4·H2O (N(4) substituent is pyrrolyl) and [Fe(II)2(PM(Ph)AT)2](BF4)4 (N(4) is N,N-diphenylamine), are stabilized in the [HS-HS] state between 300 and 2 K with weak antiferromagnetic interactions between the iron(II) centers. Five of the complexes showed gradual half spin crossover,..

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University of Melbourne Researchers

Grants

Funding Acknowledgements

This work was supported by grants from the University of Otago, the MacDiarmid Institute for Advanced Materials and Nanotechnology, and the RSNZ Marsden Fund.