X-Ray and infrared evidence of new ligand formation by addition of 3,5-dimethylpyrazole of the cynate group in a copper(II) complex

Abstract
Two forms of the compound [Cu(NCO)2(dmpz)2] have been prepared (dmpz = 3,5-dimethylpyrazole); in the nearly planar molecules of the α-form the uncoordinated dmpz nitrogen atom is linked t o the carbon atom of the NCO group, thus forming a new chelating ligand with a bent NCO skeleton.

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