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Articles by Francesc Lloret
Total Records ( 1 ) for Francesc Lloret
  Jose Carranza , Jorunn Sletten , Francesc Lloret and Miguel Julve
  The synthesis, crystal structures and variable temperature magnetic investigation of three new thiocyanato-bridged copper(II) complexes with 2,2′-biimidazole (H2bim) or 2-(2′-pyridyl)imidazole) (pyim) as coligands, {[Cu(H2bim)2][Cu(H2bim)(NCS)2(SCN)0.6667(NO3)0.3333]2} · 2H2O (1), [Cu(H2bim)(NCS)2]n (2) and [Cu(pyim)(NCS)2]n (3) are reported. Complex 1 contains centrosymmetric trinuclear species where central [Cu(2)(H2biim)2]2+ cations and peripheral [Cu(1)(H2biim)(NCS)2(SCN)] anions are linked through single end-to-end thiocyanato bridges. Complexes 2 and 3 are made up of neutral zigzag chains of copper(II) ions linked by single (2) and double (3) end-to-end thiocyanato bridges. A bidentate H2bim ligand (2) or pyim (3) and a terminal N-thiocyanate group (2) complete the coordination spheres around each copper atom. The values of the intramolecular (1) and intrachain (2 and 3) copper–copper separations are 5.6143(5) (1), 5.6744(3) (2) and 6.0797(11) Å (3). Magnetic susceptibility measurements for 13 in the temperature range 1.9–295 K show the occurrence of weak intramolecular (1) and intrachain (2 and 3) antiferromagnetic interactions [J = −0.10 (1), −0.24 (2) and −0.03 cm−1 (3), the Hamiltonians used being (1) and H = −Ji( ) (2 and 3)]. The magnitude and nature of these magnetic interactions are discussed in the light of the respective structures and they are compared with those reported for related systems.
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