What is "nickelocene"

n. (context organic compound English) The nickel metallocene bis(cyclopentadienyl)nickel.

Nickelocene is the organonickel compound with the formula Ni( η-CH). Also known as bis(cyclopentadienyl)nickel or NiCp, this bright green paramagnetic solid is of enduring academic interest, although it does not yet have any known practical applications.