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EPR study of a copper center in a single crystal of cytosine monohydrate

Copper is found incorporated into the crystal matrix of cytosine monohydrate grown from aqueous solution of commercially available cytosine. Upon ionizing irradiation the crystals exhibited the electron paramagnetic resonance (EPR) spectra characteristic of Cu(II) complex. The planar coordination bonding, having three nitrogen atoms and an oxygen as ligands, is interpreted to bridge two cytosine molecules, replacing the two cytosine-cytosine hydrogen bonds present in pure crystals. The EPR signals are much stronger for the crystals grown from the solutions to which small amount of copper powder is added.

copper-cytosine complex; cytosine crystals; EPR

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