1,5-DIAMINOPENTANETRIOLS AND 1,6-DIAMINOHEXANETETROLS, POTENT DIMER-FORMING LIGANDS FOR CU2- POTENTIOMETRIC AND SPECTROSCOPIC STUDIES( IONS)

A series of diaminoalcohols (1,5-diaminotriols and 1,6-diaminotetrols) have been synthesised and their co-ordination abilities towards Cu-II studied by potentiometry and spectroscopic techniques (UV/VIS, EPR an d CD). Both amino groups act as anchoring sites for two metal ions. Th us, two independent NH2, O- chelates are formed leading to dimeric com plexes in which two metal ions are bound to two N-terminal atoms of th e 1,5- or 1,6-diaminoalcohols. In all cases studied both ligand confor mation and absolute configuration have a distinct impact on the stabil ities of the complexes formed.