Two oxalato-bridged dinuclear copper(II) complexes, [Cu(Hdmpz)32(Î¼-ox)](ClO4)2Â·2H2O (1) and [Cu(Htmpz)32(Î¼-ox)](ClO4)2Â·2H2O (2) (Hdmpz = 3,5-dimethyl-1H-pyrazole and Htmpz = 3,4,5-trimethyl-1H-pyrazole), have been synthesized and structurally and magnetically characterized. The crystal structures of 1 and 2 consist of asymmetric bis-bidentate Î¼-oxalatodicopper(II) complex cations with two short [CuâOÂ =Â 1.976(2) (1) and 1.973(2) Ã (2)] and two long copperâoxygen bonds [CuâOÂ =Â 2.122(2) (1) and 2.110(2) Ã (2)]. The environment at each CuIIion in 1 and 2 is closer to the trigonal bipyramidal geometry than to the square pyramidal [ÏÂ =Â 0.633 (1) and 0.711 (2)]. The magnetic properties of 1 and 2 show moderate antiferromagnetic coupling between the CuIIions through the oxalato bridge [JÂ =Â â129 (1) and 161Â cmâ1(2); HÂ =Â âJS1Â· S2with S1= S2= SCu= Â½]. A thorough magneto-structural analysis has been carried out for the family of asymmetric Î¼-oxalatodicopper(II) complexes with different terminal ligands to determine the influence on the sign and strength of the magnetic coupling of subtle structural factors, such as the trigonal distortion of the metal geometry and the lengthening or the asymmetry of the metal-oxalato bond distances.
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|Titolo:||Magneto-structural correlations in asymmetric oxalato-bridged dicopper(II) complexes with polymethyl-substituted pyrazole ligands|
MARINO, Nadia (Corresponding)
|Data di pubblicazione:||2018|
|Appare nelle tipologie:||1.1 Articolo in rivista|