Lanthanoid single-ion magnets based on polyoxometalates with a 5-fold symmetry: The series [LnP5W30O110]12– (Ln3+ = Tb, Dy, Ho, Er, Tm, and Yb)

A robust, stable and processable family of mononuclear lanthanoid complexes based on polyoxometalates (POMs) that exhibit single-molecule magnetic behavior is described here. Preyssler polyanions of general formula [LnP 5W 30O 110] 12- (Ln 3+ = Tb, Dy, Ho, Er, Tm, and Yb) have been characterized with static and dynamic magnetic measurements and heat capacity experiments. For the Dy and Ho derivatives, slow relaxation of the magnetization has been found. A simple interpretation of these properties is achieved by using crystal field theory. © 2012 American Chemical Society.The present work has been funded through the EU (Project ELFOS and ERC Advanced Grant SPINMOL), the Spanish MINECO (Grants MAT2011-61584, MAT2009-13977-C03, MAT2007-61584, CTQ2008-06720 and the CONSOLIDER project on Molecular Nanoscience, CSD-2007-00010), the Generalidad Valenciana (Prometeo and ISIC Programmes of Excellence), and the Gobierno de Aragón (Project MOLCHIP).Peer Reviewe