Temperature-Induced Single-Crystal-to-Single-Crystal Transformations and Structure-Directed Effects on Magnetic Properties - Archive ouverte HAL
Article Dans Une Revue Inorganic Chemistry Année : 2007

Temperature-Induced Single-Crystal-to-Single-Crystal Transformations and Structure-Directed Effects on Magnetic Properties

Résumé

The binding of CoII, NiII, and CuII cations to the lithium 3-pyridinesulfonate ligand in an aqueous solution leads to single crystals of coordination polymers 1-3. The solid-state architectures of 1-3 which resulted from the combination of ligand-water heterocomplexation processes are linear coordination polymers packed into parallel alternatively stratified layers. These layers are interconnected through intermolecular hydrogen-bonding interactions occurring between the coordinated water molecules and the noncoordinating oxygen atoms of the sulfonate groups. Consequently, this leads to the formation of the cross-linked 3D (1, 2) or layered 2D (3) networks exhibiting 12- point or four-point hydrogen bond contacts between each unit with eight or four adjacent neighbors, respectively. The reversible structural rearrangement of these frameworks proceeds from the “relaxed” room-temperature phase to the “contracted” low-temperature phase in response to an external thermal stimulus. The reversibility of the contraction/relaxation process has been tested and confirmed by X-ray analysis. Motions toward shortening intermolecular distances have the consequence of increasing the degree of magnetic interaction between the metal ions. The magnetic measurements carried out in the range 1.8-400 K on the three compounds show an unusual change from antiferromagnetic to ferromagnetic behavior related to the structural variations recorded at low temperatures and to the loss of water above 350 K.

Dates et versions

hal-00449818 , version 1 (22-01-2010)

Identifiants

Citer

Yves-Marie Legrand, Arie Van-Der-Lee, Nathalie Masquelez, Pierre Rabu, Mihai Barboiu. Temperature-Induced Single-Crystal-to-Single-Crystal Transformations and Structure-Directed Effects on Magnetic Properties. Inorganic Chemistry, 2007, 46 (22), pp.9083-9089. ⟨10.1021/ic700867b⟩. ⟨hal-00449818⟩
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