Infrared spectra of Mn(NH)Zn(CN).2CH andMn(ethylenediamine)Zn(CN).2CH are reported. The spectral data suggest that these compounds are similar in structure toHofmann-T-type and the en-T-type clathrates,respectively. There is good evidence for H-bonding from ammoniaN–H to benzene as a π to σ H-bond.