posted on 1997-01-29, 00:00authored byPaul V. Bernhardt
The synthesis, spectroscopy, and electrochemistry of
the acyclic tertiary tetraamine copper(II) complex
[CuL1](ClO4)2
(L1 =
N,N‘-bis(2‘-(dimethylamino)ethyl)-N,N‘-dimethylpropane-1,3-diamine)
is reported. The X-ray
crystal structure of
[CuL1(OClO3)2] reveals a
tetragonally elongated CuN4O2 coordination
sphere, exhibiting relatively
long Cu−N bond lengths for a CuII tetraamine, and a small
tetrahedral distortion of the CuN4 plane. The
[CuL1]2+
ion displays a single, reversible, one-electron reduction at −0.06 V
vs Ag/AgCl. The results presented herein
illustrate
the inherent difficulties associated with the separation and
characterization of CuII complexes of tertiary
tetraamines,
and some previously incorrect assertions and unexplained observations
of other workers are discussed.