FeBr3 (0.591 g, 2 mmol) was dissolved with hexamethylenetetramine (0.476 g, 3.4 mmol) MeCN (25 ml) and 3,4-lutdine (0.35 ml, 3.1 mmol) was added. The reaction was stirred for four hours and then filtered and allowed to stand undisturbed overnight. Diffusion of iPrOH into this solution afforded dark brown plate-shaped crystals suitable for X-ray diffraction after 3 weeks. Elemental analysis (% C H N) calculated (found) for Br12C112Fe30H159N16O47: