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Iron(III) complexes of 2-methyl-6-(pyrimidin-2-yl-hydrazonomethyl)-phenol as spin-crossover molecular materials

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Abstract

Four new mononuclear Fe(III) complexes 1–4 of 2-methyl-6-(pyrimidin-2-yl-hydrazonomethyl)-phenol (H2L) have been synthesized and characterized by magnetic susceptibility measurements and single-crystal X-ray diffraction analysis. Complexes 1–3 are ionic compounds with the formula [Fe(HL)2]X·nsolvent (X = ClO4 (1), BF4 (2) and Cl (3)), while complex 4 ([Fe(HL)(L)]) is neutral. The central Fe(III) ion in complexes 1–4 is coordinated by four nitrogen and two oxygen atoms of two Schiff base ligands HL or L2−, and the coordination geometries of FeIII are all distorted octahedral. Magnetic measurements indicate that complex 1 shows an abrupt spin transition with a thermal hysteresis of 32 K (T1/2↓ = 158 K and T1/2↑ = 190 K), and complex 4 exhibits a gradual incomplete spin transition. Complexes 2 and 3 are high spin with a room-temperature χmT value of 4.32 cm3 K mol−1 and 4.39 cm3 K mol−1, respectively.

Graphical abstract: Iron(iii) complexes of 2-methyl-6-(pyrimidin-2-yl-hydrazonomethyl)-phenol as spin-crossover molecular materials

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Publication details

The article was received on 31 Aug 2017, accepted on 08 Nov 2017 and first published on 09 Nov 2017


Article type: Paper
DOI: 10.1039/C7DT03233A
Citation: Dalton Trans., 2017, Advance Article
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    Iron(III) complexes of 2-methyl-6-(pyrimidin-2-yl-hydrazonomethyl)-phenol as spin-crossover molecular materials

    J. Yuan, M. Liu, C. Liu and H. Kou, Dalton Trans., 2017, Advance Article , DOI: 10.1039/C7DT03233A

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