Abstract
A representative form of cupric impurity ion complexes in asparagine monohydrate crystals is a trans bisasparaginato Cu(II) dihydrate, in which the ion is coordinated by two α amino groups, two carboxyl oxygens, and two H 2O. The complex structure characterized by the ligand nitrogen hyperfine structure in EPR spectra has been found to depend on pH of the solution from which the crystals were grown. In asparagine crystals, water molecules of hydration are directly involved in the impurity complexes and therefore considered to be responsible for the observed pH dependence. The EPR results have indicated that the magnetic structure is asymmetrical, depending on the surrounding proton configuration due to charge compensation for divalent impurity ions.
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