Asian Science Citation Index is committed to provide an authoritative, trusted and significant information by the coverage of the most important and influential journals to meet the needs of the global scientific community.  
ASCI Database
308-Lasani Town,
Sargodha Road,
Faisalabad, Pakistan
Fax: +92-41-8815544
Contact Via Web
Suggest a Journal
Polyhedron
Year: 2009  |  Volume: 28  |  Issue: 11  |  Page No.: 2249 - 2257

Preparation, crystal structures and magnetic properties of three thiocyanato-bridged copper(II) complexes with 2,2′-biimidazole or 2-(2′-pyridyl)imidazole as terminal ligands

Jose Carranza, Jorunn Sletten, Francesc Lloret and Miguel Julve    

Abstract: 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.

View Fulltext    |   Related Articles   |   Back
   
 
 
 
  Related Articles

 
 
 
 
Copyright   |   Desclaimer   |    Privacy Policy   |   Browsers   |   Accessibility