Synthesis, structure and magnetic properties of an iron(II) complex with nitronyl nitroxides
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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 nitroniyl 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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