Magnetic and Structural Properties of Rare Earth Hybrid Frameworks

G. PUNTE; C.G. POZZI; G. ECHEVERRÍA; E. BRUSAU; G. NARDA; J. ELLENA

Florencia, Italia

Congreso; XX IUCr Congress; 2005

Aliphatic dicarboxilates (AD), -O2C(CH2)nCO2-, have shown to be excellent ligands for crystal engineering transition metal molecular magnets [1]. With the aim of extending these studies to rare earth systems we have synthesized a series of organic inorganic hybrids of Ln(III) and AD anions, with 1 £ n £ 4, from solutions under ambient conditions. Their single crystal x ray structural analysis show the formation of inorganic polymeric arrangements of different dimensionalities. AC susceptibility, c´, measurements performed within the temperature range 13 < T < 330K show noticeable changes in the c´T curve slope at different T values. To investigate the potential structural contribution to those magnetic ordering variations, we performed single crystal x-ray analysis in the temperature ranges of interest in steps of 2K. We discuss possible links between modifications in superexchange paths connecting cations -and eventually in hydrogen bonds networks- and magnetic response.