The reaction of Ni(CIO4)(2)center dot 6H(2)O with 3-ferrocenyl-5-(2-pyridyl)pyrazole (Hfcpp) and Et3N in acetonitrile yielded a pentadecanuclear heterometallic complex of [Ni-7(fcpp)(8)(OH)(4)]-(CIO4)(2)center dot 6CH(3)CN (1). Complex 1 has a heptanuclear wheel core composed of seven Ni-II ions, and eight ferrocenyl groups are attached to the core through pyrazolyl groups. Magnetic susceptibility measurements for 1 revealed that overall antiferromagnetic interactions are operative within the heptanuclear core.