Abstract
New rare-earth cymantrenecarboxylates [Nd 2(μ 2-OOCCym) 4(OOCCym) 2(THF) 4] ( 1) and [Ln 2(μ 2-OOCCym) 4(OOCCym) 2(THF) 4]·THF (Ln = Gd ( 2), Eu ( 3); Cym = (η 5-C 5H 4)Mn(CO) 3) were synthesized starting from carboxycymantrene and lanthanide nitrates, and characterized by X-ray diffraction. The crystals of 1– 3 consist of isolated binuclear molecules; the Ln atoms are eight-coordinate. The magnetic properties of 2 are indicative of antiferromagnetic coupling between the Gd atoms at liquid helium temperature. The thermal decomposition of complexes 1– 3 was studied by differential scanning calorimetry (DSC) and thermogravimetry (TG). According to the X-ray powder diffraction patterns, the thermal decomposition of the complexes in air affords a mixture of LnMn 2O 5 and Mn 2O 3 as the final products.
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