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Raman scattering in the spin-crossover system [Fe(pmd)(H2O){Au(CN)2}2]*H2Oreveals a complex three-phase spin-state transition in contrast to earlierobservations in magnetization measurements. We observe different spin statephases as function of temperature and electromagnetic radiation in the visiblespectral range. There exists a fluctuating spin state phase with an unexpectedwipeout of the low frequency phonon scattering intensity. Furthermore weobserve one phase with reduced symmetry that is attributed to a cooperativeJahn-Teller effect. Pronounced electron-phonon interaction manifests itself asa strong Fano-resonance of phonons related to {FeN6} and {FeN4O2} coordinationoctahedra. Density functional theory supports this interpretation.

Spectral sensitive phonon wipeout due to a fluctuating spin state in a Fe2+ coordination polymer