| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1306312 | Inorganica Chimica Acta | 2011 | 8 Pages |
Reaction of sodium picolinate with FeIII oxo-centered carboxylate triangles in MeCN in the presence of PPh4Cl yields (PPh4)[Fe4O2(O2CR)7(pic)2] (R = Ph (1), But (2)). Omitting the phosphonium cation produces [Fe8Na4O4(O2CPh)16(pic)4(H2O)4] (3), which contains two Fe4Na2 units bridged by two picolinate ligands. X-ray crystal structures of 1 and 3 are reported.Voltammetric profiles in MeCN show four one-electron reduction steps for complexes 1 and 2. Variable-temperature magnetic susceptibility measurements in polycrystalline samples of 1 and 3 reveal strong antiferromagnetic couplings leading to S = 0 ground states.
Graphical abstractCompounds (PPh4)[Fe4O2(O2CR)7(pic)2] (R = Ph (1), But (2)) and [Fe8Na4O4(O2CPh)16(pic)4(H2O)4] (3) were prepared from sodium picolinate and “basic iron carboxylates” in MeCN. Voltammetric profiles for 1 and 2, and X-ray crystal structures and variable-temperature magnetic susceptibility measurements of 1 and 3 are reported.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► {Fe3O} triangles react with sodium picolinate to give {Fe4O2} or {Fe8Na4O4} cores. ► {Fe4O2} complexes show four one-electron reduction steps in acetonitrile. ► Studied {Fe4O2} and {Fe8Na4O4} cores posses S = 0 ground states.
