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IR spectroscopy was used to study (5-nitrotetrazolato-N 2 )pentaaminecobalt(III) perchlorate (1) and {bis-[cis-(5-nitrotetrazolato-N 2 )]}tetraaminecobalt(III) perchlorate (2) and products of their decomposition under the action of laser light resonant in energy with d-d transitions observed in these complexes. The electronic spectra of complexes 1 and 2 are governed by d-d transitions of cobalt ions ( 1 A 1g → 1 T 2g at 328-330 nm and 1 A 1g → 1 T 1g at 455-466 nm) and ligand-metal charge transfer in a shorter wavelength range. Comparison of the vibration spectra of the decomposition products and starting complexes suggests that cobalt amminates decompose to give additional [-NO 2 ] groups in unknown compounds.

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