Synthesis, Characterisation and Magnetic Behaviour of Ionic Metalloporphyrins: Metal–Tetrakis(N-Octyl-4-Pyridinium)–Porphyrins with Tetrabromoferrate(III) Anions

A series of magnetic, ionic-substituted tetrapyridyl metalloporphyrins, [tetrakis(N-octyl-4-pyridinium)–metal–porphy-rin][tetrabromoferrate(III)] 4 (metal=iron, cobalt, manganese, copper or zinc), have been synthesised. All compounds show weak ferromagnetic behaviour at room temperature and respond to an external neodymium magnet.