Unraveling the Coordination Geometry of Copper(II) Ions in Aqueous Solution through Absorption Intensity


  • Financial support from the Spanish Ministerio de Ciencia e Innovación (project numbersMAT2008-06873-C02-01 and MAT2011-28868-C02-01) is acknowledged. This work has been carried out within the framework of the MALTA Consolider Ingenio 2010 (grant number CSD2007-00045).


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Strong colors: The solvation structure of copper(II) ions in water can be determined by optical absorption spectroscopy. Focus is placed on the absorption intensity (green: Cs2Cu(SO4)2⋅6 H2O, black: CuSO4⋅5 H2O, red: Cu2+ in aqueous solution, and blue: Cu2+ in glass). A dynamical model based on a Jahn–Teller-distorted complex describes the coordination of copper(II) ions in hydrate crystals and aqueous solution.