6533b850fe1ef96bd12a8302
RESEARCH PRODUCT
Crystal structure and magnetic properties of the flexible self-assembled two-dimensional square network complex [Cu2(mal)2(H2O)2(4,4′-bpy)] (H2mal=malonic acid and 4,4′-bpy=4,4′-bipyridine)
Catalina Ruiz‐pérezYolanda Rodríguez-martínJoaquín SanchizMiguel JulveFrancesc Lloretsubject
Denticitychemistry.chemical_elementCrystal structureMalonic acidCopper44'-BipyridineInorganic Chemistrychemistry.chemical_compoundCrystallographyMalonatechemistryMaterials ChemistryMoleculePhysical and Theoretical ChemistrySingle crystaldescription
Abstract The copper(II) complex [Cu 2 (mal) 2 (H 2 O) 2 (4,4′-bpy)] ( 1 ) (H 2 mal=malonic acid and 4,4′-bpy=4,4′-bipyridine) has been prepared and its structure determined by single crystal X-diffraction methods. Compound 1 has a two-dimensional square grid network structure. The square grids are stacked parallel but in a staggered manner on each other along the c -axis, with an interlayer separation of 3.850(1) A. Each layer contains a large cavity of 15.784(1)×15.784(1) A with each edge shared by one malonate group and one 4,4′-bpy ligand and a small planar square of 4.644(1)×4.644(1) A with Cu(II) ions and malonate groups at each corner and side, respectively. Each copper atom is in a distorted square-pyramidal surrounding with three carboxylate-oxygen atoms from two malonate groups and one nitrogen atom from a 4,4′-bpy ligand building the equatorial plane and a water molecule in the axial position. Each 4,4′-bpy molecule exhibits the bis-monodentate bridging mode whereas the malonate simultaneously adopts the bidentate (at one copper atom) and monodentate (at the adjacent copper atom) coordination modes. The bridging carboxylato exhibits the anti – syn coordination mode. The magnetic properties of 1 have been investigated in the temperature range 1.9–300 K and they correspond to a dominant ferromagnetic coupling through bridging malonato within the small square defined by four copper(II) ions ( J =+12.4(1) cm −1 ) and much weaker intrasheet antiferromagnetic coupling between copper(II) ions through bridging 4,4′-bpy ( j eff =−0.052(1) cm −1 ).
year | journal | country | edition | language |
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2001-06-01 | Inorganica Chimica Acta |