Novel heterometallic polymeric lanthanide acetylacetonates with bridging cymantrenecarboxylate groups - synthesis, magnetism and thermolysis

New isostructural complexes [Ln(CymCOO)(acac)(2)(H2O)](n) (Ln = Eu (1), Gd (2), Tb (3), Dy (4), Ho (5), Er (6), acac - acetylacetonate (pentane-2,4-dionate) anion) having a polymeric structure based on CymCOO-bridged {Ln(acac)(2)(H2O)} fragments were prepared by exchange reactions of hydrated Ln acetylacetonates with CymCOOH (Cym = (eta(5)-C5H4)Mn(CO)(3)) in a CHCl3-EtOH-H2O mixture. For the synthesized complexes comprising diamagnetic cymantrenyl moieties the temperature dependences of the dc magnetic susceptibility were studied in the temperature range of 300-2 K under an applied magnetic field of 5 kOe. Slow magnetic relaxation was found in complexes 4 and 6. The thermal decomposition of the complexes was studied by TGA and DSC in the 30-600 degrees C temperature range in air and under Ar atmosphere. In the former case, the reaction affords LnMnO(3) phases. The first step of the thermal decomposition of 6 was studied by the kinetic analysis. For the Dy and Ho complexes, standard thermodynamic functions were calculated from adiabatic calorimetry data. Manganites LnMnO(3) (La = Eu, Gd, Tb, Dy) were synthesized from the corresponding complexes, and their magnetic properties were studied. (C) 2015 Elsevier Ltd. All rights reserved.