Synthesis and properties of cobalt(II) coordination polymers linked by 4′-(4-pyridyl)-2,2′:6′,2″-terpyridine

Abstract

The cationic one-dimensional coordination polymers [{Co(pyterpy)2}{M(hfac)2}]2+ (M = Co(II) or Zn(II); pyterpy = 4′-(4-pyridyl)-2,2′:6′,2″-terpyridine; hfac− = hexafluoroacetyloacetonate) feature alternating {Co(pyterpy)2} and {M(hfac)2} units linked through heteroditopic pyterpy ligands. Cocrystallization with [M(hfac)3]− (M = Co(II) or Zn(II)) counteranions has afforded the compounds: [{Co(pyterpy)2}{Co(hfac)2}][Co(hfac)3]2 (1) and [{Co(pyterpy)2}{Co0.7Zn0.3(hfac)2}][Zn(hfac)3]2 (2). Variable temperature crystallographic and magnetic studies indicate low spin cobalt(II) ions in the {Co(pyterpy)2} components of the coordination polymers up to room temperature; magnetic studies suggest the o..