First NiII-LnIII coordination Polymers Constructed by Using [Ni(bpca)2] as a Building Block [Hbpca = bis(2-pyridylcarbonyl)amine]: Synthesis, Crystal Structures and Magnetic Properties. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue European Journal of Inorganic Chemistry Année : 2007

First NiII-LnIII coordination Polymers Constructed by Using [Ni(bpca)2] as a Building Block [Hbpca = bis(2-pyridylcarbonyl)amine]: Synthesis, Crystal Structures and Magnetic Properties.

Résumé

Three new heterobimetallic 1D coordination polymers have been obtained by assembling the [Ni(bpca)2] complex, as a building block, with lanthanide cations: [{Ln(O2NO)(H2O)3}- {Ni(bpca)2}](NO3)2·3H2O (Ln Gd 1; Tb 2; Dy 3). The three compounds are isostructural and their structure consists of infinite cationic chains with LnIII ions connected by [Ni- (bpca)2] complexes acting as bridging bis-bidentate ligands. The charge of the chains is counterbalanced by uncoordinated nitrate ions. The LnIII ions display a coordination number of nine: four oxygen atoms from the carbonyl groups of the bpca ligands belonging to two {Ni(bpca)2} moieties, two oxygen atoms from a chelating nitrato ion and threewater molecules. The magnetic investigation of the gadolinium derivative 1 revealed very weak intrachain NiII–GdIIIferromagnetic interactions (θ = +0.15 K). The weak intrachain- exchange interactions, as well as the bad magnetic isolation of the chains in the crystals, preclude the single-chain magnet behaviour of compounds 2 and 3. The out-of-phase, χ, signal observed with compounds 2 and 3 can be ascribed to the magnetic slow relaxation of the lanthanide ions (TbIII, DyIII).

Dates et versions

hal-00525368 , version 1 (11-10-2010)

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Augustin M. Madalan, Kevin Bernot, Fabrice Pointillart, Marius Andruh, Andrea Caneschi. First NiII-LnIII coordination Polymers Constructed by Using [Ni(bpca)2] as a Building Block [Hbpca = bis(2-pyridylcarbonyl)amine]: Synthesis, Crystal Structures and Magnetic Properties.. European Journal of Inorganic Chemistry, 2007, pp.5533-5340. ⟨10.1002/ejic.200700717⟩. ⟨hal-00525368⟩
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