The vibrational spectra of the crystalline materials K2Zn(CN)4, K2Zn(13CN)4, K2Zn(Cthinsp;15N)4, K2thinsp;64Zn(CN)4, and K2thinsp;68Zn(CN)4have been observed using infrared and Raman spectroscopy. A number of the potential constants in this system have been calculated from the various isotopic frequencies. It was necessary to constrain several of the potential constants which are essentially indeterminate. An analysis of these constraints was made to show that they are justified. A comparison of the potential constants of Zn(CN)minus;24with isoelectronic Ni(CO)4shows that for the zinc complex there is negligible backhyphen;pgr; bonding of the zincdorbitals to the CN ligands. A number of interesting stretchndash;stretch and stretchndash;bend interactions are discussed.
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