Liu, Ya-Nan; Hou, Jin-Le; Wang, Zhi; Gupta, Rakesh Kumar; Jaglicic, Zvonko; Jagodic, Marko; Wang, Wen-Guang; Tung, Chen-Ho; Sun, Di published the artcile< An Octanuclear Cobalt Cluster Protected by Macrocyclic Ligand: In Situ Ligand-Transformation-Assisted Assembly and Single-Molecule Magnet Behavior>, Quality Control of 366-18-7, the main research area is octanuclear cobalt silsesquioxane sandwich cluster preparation crystal mol structure; hexamethylcyclohexasiloxanolate cobalt octanuclear sandwich preparation single mol magnet; protected macrocyclic ligand transformation assisted mol magnet behavior.
Macrocyclic mols. with multiple coordination sites have been widely used as promising ligands to build polynuclear metal clusters; however, cyclic silsesquioxane-based metal clusters are still rare. Herein, authors report a new octanuclear Co-silsesquioxane cluster [Co8(OH)2{(MeSiO2)6}2(bpy)2(Obpy)2] (SD/Co8c; SD = SunDi), wherein the Co8 disk-like core is sandwiched by two hexamethylcyclohexasiloxanolate ligands (MeSiO2)6 at two poles and finally encircled by two bpy (bpy = 2,2′-bipyridine) and two Obpy (HObpy = 6-hydroxy-2,2′-bipyridine) ligands at the equatorial region. Interestingly, both MeSi(OMe)3 and bpy undergo in situ transformations to generate hexameric cyclic (MeSiO2)6 and Obpy, resp. The unusual hydroxylation of bpy and the OH- anion in the center of Co8 core provide addnl. binding sites to induce the formation of the larger cluster instead of the traditional hexanuclear cluster. The solution stability and fragmentation route in the gas phase were studied by cold-spray ionization and collision-induced dissociation mass spectrometry, resp. Both results reveal that the Co8 core is quite stable in solution as well as in the gas phase, even with increased collision voltage. Magnetic susceptibility studies of SD/Co8c show the slow magnetization relaxation indicative of single-mol. magnet (SMM) behavior. This work not only presents the multiple in situ ligand-transformation-assisted assembly of polynuclear cobalt cluster but also provides some new insights into the magnetism-structure relationship for SMMs.
Inorganic Chemistry published new progress about Crystal structure. 366-18-7 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2, Quality Control of 366-18-7.