The Cu-4 derivatives of [EtSiO2]Na have been synthesised and their cyclic v
oltammetry, spectroscopic behaviour and X-ray structure determination descr
ibed. The changes in the alkali cation, Na+ in place of K+, might have a "t
uning" effect in the organisation on the siloxanolate clusters resulting in
a macrocyclic ([EtSiO2](12)) ligand instead of two cyclic ([EtSiO2](6)) li
gands.