Abstract
Three lanthanide complexes with mellitic acid [Ce 2{C 6(COO) 6}(H 2O) 8]·H 2O ( 1), [Eu 2{C 6(COO) 6}(H 2O) 8]·H 2O ( 2) and [Yb 2{C 6(COO) 6}(H 2O) 10]·2H 2O ( 3), have been synthesized and structurally characterized by X-ray crystallography and magnetic properties. The three compounds crystallize in the monoclinic space space P2 1/ n, with unit cell dimensions of: a = 8.627(2), b = 13.218(2), c = 9.650(1) A ̊ , β = 95.93(1)° and Z = 2 for 1;a = 8.505(2), b = 13.145(1), c=9.536(2) A ̊ , β=94.73(2)° and Z=2 for 2; a = 8.420(1), b = 9.224(4), c = 16.229(1) A ̊ , β = 100.267(9)° and Z = 2 for 3. All three structures consist of an extended network of metal ions, coordinated to mellitate anions and water molecules linked by a complex hydrogen bonding. 1 and 2 are isomorphous with near isostructural [M 2{C 6(COO) 6}(H 2O) 8] units in which the metal ion is coordinated by four water molecules and five oxygen atoms of the mellitate anions, and each mellitate group involves a tetrakis(bidentate) and bis(unidentate) coordination mode bridging six metal ions forming a three-dimensional framework. In 3 the ytterbium atom is bound with five water molecules and three oxygen atoms of the mellitate anion, and each mellitate moiety bridges four dodecahedral Yb(III) ions yielding a two-dimensional sheet structure. The magnetic susceptibility of 1 and 3 as a function of temperature (5.0–300 K) exhibits a sharp maximum at 6.0 K for both compounds.
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