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Articles by Miguel Julve
Total Records ( 2 ) for Miguel Julve
  Jose Martinez-Lillo , Francisco Lloret , Miguel Julve and Juan Faus
  The mononuclear complexes [ReCl4(bpym)] (1) and [ReBr4(bpym)] (2) (bpym = 2,2′-bipyrimidine) are weak ferromagnets. Magnetic ordering occurs below 7.0 (1) and 20.0 K (2) and good hysteresis loops are observed for the two compounds at 2.0 K. A spin-canting phenomenon, i.e., a non-strict linearity of the individual spins aligned in an anti-parallel way by intermolecular antiferromagnetic coupling occurring in many Re(IV) complexes, accounts for these magnetic features which are unusual in molecular solids such as 1 and 2.
  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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