Supramolecular Cobalt Cages and Coordination Polymers Templated by Anion Guests: Self‐Assembly, Structures, and Magnetic Properties
Résumé
Abstract We report the anion‐templated syntheses of a variety of supramolecular assemblies of Co II . Remarkably in the presence of a weakly coordinating ion such as BF 4 − , a discrete three‐dimensional cage [BF 4 ⊂(BF 4 ) 2 Co 2 (L 1 ) 4 ][BF 4 ] ( 2 ) is formed with three coordinated BF 4 − ions, a rare example in supramolecular chemistry (L 1 =di(benzimidazole)‐1,4‐phenylene). Switching to stronger coordinating ions, such as NO 3 − or Cl − , a one‐dimensional coordination polymer [{Co(L 1 )(NO 3 ) 2 } n ] ( 3 ) and a metallomacrocycle [Co 2 (L 1 ) 2 (Cl) 4 ] ( 5 ) were formed, respectively. These results illustrate the powerful effect of the anion‐templating chemistry. Finally the magnetic properties of these assemblies 1 b , 2 , 3 , and 5 are presented and discussed.