A cyanide-bridged wheel featuring a seven-coordinate Mo(iii) center.

A new cyclicmolecule incorporating [Mo-III(CN)(7)](4-) has been characterized by single crystal X-ray methods, SQUID magnetometry and theoretical calculations. The wheel molecule [Mo-III(CN)(7)](6)[Ni(L)](12)(H2O)(6) exhibits ferromagnetic Mo- Ni coupling which did not exist for the previously reported octacyanometallate analogue [Mo-IV(CN)(8)](6)[Ni(L)](12)(H2O)(6). These results indicate that known supramolecular architectures incorporating octacyanometallates can be used as platforms for making new molecules incorporating seven-coordinate cyanide precursors.