X-irradiation of single crystals of several tri-coordinated Cu(I) monomer a
nd dimer complexes studied by EPR revealed that Cu(I) monomer complexes for
m Cu(II) complexes while X-irradiation of the Cu(I) dimer complexes has no
such effect. The formation of Cu(II) complexes is attributed to the additio
n of a radiogenic atom on the Cu(I) precursor. The absence of any structura
l changes due to the X-irradiation of the Cu(I) dimer complexes is discusse
d based on the electronic structure of these complexes. (C) 1999 Elsevier S
cience B.V. All rights reserved.