title: Substantial increase of the ordering temperature for [MnII/MoIII(CN)7]-based magnets as a function of the 3d ion site geometry: example of two supramolecular materials with Tc = 75 and 106 K.
abstract: Two molecule-based magnets, [Mn(2)(tea)Mo(CN)(7)].H(2)O, 1, and [Mn(2)(tea)Mo(CN)(7)], 2 (tea stands for triethanolamine), formed with the 4d ion building block, [Mo(CN)(7)](4)(-), Mn(II) ions, and an additional ligand, tea, have been prepared and structurally characterized by single-crystal X-ray analyses. Whereas 1 is obtained by a self-assembling process in solution, compound 2 is quantitatively formed through a smooth thermal treatment of 1. Their magnetic properties revealed that these compounds exhibit magnetic ordering at T(c) = 75 and 106 K respectively for compounds 1 and 2. The difference for their critical temperature is attributed to the geometry of the coordination sphere of a Mn(II) site found to be square-pyramidal for 1 and tetrahedral for 2.
authors.affiliation: Institut de Chimie de la Matière Condensée de Bordeaux, UPR CNRS No. 9048, F-33608 Pessac, France.
authors.forename: Stéfania
authors.initials: S
authors.lastname: Tanase
authors.forename: Floriana
authors.initials: F
authors.lastname: Tuna
authors.forename: Philippe
authors.initials: P
authors.lastname: Guionneau
authors.forename: Thierry
authors.initials: T
authors.lastname: Maris
authors.forename: Guillaume
authors.initials: G
authors.lastname: Rombaut
authors.forename: Corine
authors.initials: C
authors.lastname: Mathonière
authors.forename: Marius
authors.initials: M
authors.lastname: Andruh
authors.forename: Olivier
authors.initials: O
authors.lastname: Kahn
authors.forename: Jean-Pascal
authors.initials: JP
authors.lastname: Sutter