Cyano vs isocyano

[806142023]

How do we know if it's the C or the N bound to the TM in a coordination complex if it's not directly stated?

[mohammada1f]

To determine whether a ligand binds through carbon (C) or nitrogen (N) in a coordination complex, consider the type of ligand and its typical binding behavior. Ligands like ammonia (NH₃), amines, or pyridine usually bind through nitrogen, while ligands like carbon monoxide (CO) or cyanide (CN⁻) typically bind through carbon. Resonance can also help; for example, CN⁻ binds through carbon because its lone pair is more available, while isocyanide (NC⁻) binds through nitrogen. If ambiguous, experimental techniques or specific context may be needed to confirm the binding site.

[806142023]

Yeah my question is how do we know if it's CN- or NC-?