a generic (μ2-Dinitrogen)-bis(bis(η5cyclopentadienyl)-zirconium) Illustrating a Syn vs an Anti isomer In the Anti-Isomer the C2 lies along the N-N bond, so rotation about the C2 DOES NOT make the two Ns equivalent In the Syn-Isomer the C2 lies perpendicular the N-N bond, so rotation about the C2 axis makes the two Ns equivalent