Manganese(II) Trimeric Systems Derived from Pyridyldioximato Ligands: Synthesis, Crystal Structure, and Magnetic Characterization

Abstract

Abstract Three new manganese compounds have been obtained by reaction of the 2,6‐diacetylpyridine dioxime (dapdoH 2 ) ligand with several Mn II salts. By using a variety of manganese(II) carboxylates, three Mn II derivatives with general formula [Mn 3 (RCOO) 6 (dapdoH 2 ) 2 ], where RCOO – = formate ( 1 ), acetate ( 2 ), and benzoate ( 3 ), were obtained. Structural analysis reveals chains of trinuclear units for 1 and isolated trinuclear molecules for 2 . Compound 1 provides an example of a new topology for the [Mn 3 (RCOO) 6 (L) 2 ] general formula. Magnetic susceptibility studies reveal topological ferrimagnetism for 1 and conventional antiferromagnetic response for 2 and 3 , with coupling constants of –3.1, –3.2, and –1.4 cm –1 inside the trimeric units of 1 , 2 , and 3 , respectively.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)