# Why isn't N2 a Lewis base?

Why is $\ce{N2}$ (dinitrogen) not a Lewis base even with two lone pairs?

The lone electron pairs in dinitrogen are in $\mathrm{sp}$ hybridization state, and nitrogen is quite electronegative, so they are not easily donated. Still, if a Lewis acid is strong enough, dinitrogen may form a complex.
It is known that dinitrogen adsorbs on acidic $\ce{OH}$-groups in zeolites, forming complex with IR-active frequency. The nature of the complex may be debated, as no full proton transfer occurs, but the electron pairs are definitely involved.