Synthesis,structure and magnetic properties of a novel lead(II)complex containing nitronyl nitroxide radicals

摘要

The lead(II)complex with nitronyl nitroxide,[Pb(NIT2Py)2(NO3)2][NIT2Py=2-(2'-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide],has been prepared and characterized by magnetic and single-crystal X-ray diffraction studies.In the complex,the lead(II)ion is coordinated with two bidentate nitronyl nitroxide and two nitrate anions.The lead(II)ion shows seven-coordinate geometry.Magnetic susceptibility data for the title complex has been measured in the range 5-300 K.There are antiferromagnetic interaction between the coordinated nitronyl nitroxides(J=-19.35 cm~(-1))and intermolecular ferromagnetic interactions.Thus,we observe the sixth periodic IVA group metal element Pb(II)ion providing an effective pathway for the magnetic exchange interaction between nitronyl nitroxide radicals.