The tris(aminoethyl)amine derivative tris{ [(para-nitrobenzyl)phenyl]aminoethyl}amine [(p-NO 2 BP) 3 tren] was reacted with copper(II) nitrate in thf to yield three different solvates of [Cu(p-NO 2 BP) 3 trenNO 3 ]NO 3 (C1) in the solid state, namely α-C1·2thf (C2), β-C1·2.5thf (C3) and α-C1·(thf) 1.5 · (iPr 2 O) 0.25 (C4). The light green-yellow coloured complexes, C2 and C4, are different solvates of the one distortion isomer, while the dark-green C3 is a different distortion isomer. The spectral properties of these distortion isomers were examined, and the structures of C3 and C4 were determined by Xray crystallography. The difference in the physical properties (EPR and reflectance electronic spectra) of the light and dark
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