Synthesis,structure and magnetic properties of an iron(II) complex with nitronyl nitroxides |
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| Institution: | Graduate School of Pure and Applied Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba 305-8571, Japan;Department of Chemistry, University of Florida, Gainesville, FL, USA |
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| Abstract: | An iron(II) complex with nitronyl nitroxides, FeII(dppNN)2](BF4)2 · CH3COCH3 (1) (dppNN = 2,6-di(pyrazol-1-yl)-4-(4,4,5,5-tetramethyl-1-oxido-3-ylooxy-4,5-dihydro-3H-imidazol-2′-yl)pyridine) was synthesized. In 1 the central iron(II) ion was coordinated by two tridentate ligands with nitronyl nitroxides. Magnetic susceptibility measurements showed that χmT values below 130 K was almost temperature independent, while upon increasing temperature χmT values showed gradual increase, suggesting an occurrence of a spin transition from low to high spin state. Green light irradiation on powder sample at 5 K resulted in spin conversion (LIESST). |
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