DIIRON(III) AND POLYMERIC IRON(III)-SODIUM COMPLEXES WITH BRIDGING AND TERMINAL PYRIDONATE LIGANDS - STRUCTURES AND MAGNETIC-PROPERTIES

The reaction of anhydrous iron(III) chloride or [NEt(4)](2)[Fe2Cl6O] w ith equimolar quantities of 6-chloro-2-pyridone (Hchp) and NaOMe in Me OH afforded, after recrystallisation from tetrahydrofuran (thf), the o ne-dimensional polymer [{Fe(mu-chp)(6)Na-3(mu-MeOH)(6) . 2thf}(n)]1. W hen the reaction of FeCl3 with NaOMe and Hchp was performed in the pre sence of 4,4'-dimethyl-2,2'-bipyridine (dmbipy) or 1,10-phenanthroline (phen) the dinuclear complexes [Fe-2(mu-OMe)(2)(chp)(4)(dmbipy)(2)]. 2MeOH 2 or [Fe-2(mu-OMe)(2)(chp)(4)(phen)(2)]. 2MeOH3 resulted. The mo lecular structures at 150 K and magnetic properties between 1.8 and 28 0 K of 1-3 have been investigated. Complex 1 displays magnetic behavio ur consistent with a paramagnet while 2 and 3 exhibit antiferromagneti c exchange interactions between the spins of the iron(III) ions throug h OMe bridges (J = -26.8 to -28.6 cm(-1)).