The Vibrational Spectrum and Thermodynamic Properties of Nickel Carbonyl

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Abstract
The infra‐red absorption spectrum of nickel carbonyl has been measured in the gas phase from 4 to 23μ, and in the liquid phase from 1 to 8μ. Normal coordinate treatments of both the square and tetrahedral models of the AB4C4 molecule have been applied to the infra‐red and Raman data; the results give further evidence of the tetrahedral structure of nickel carbonyl. An analysis of the vibrational spectrum has been made, based on the tetrahedral model, and has been applied to the statistical calculation of the entropy, heat capacity, and free energy function.