Binding of Delta-, Delta-[Ni (phen)(3)](2+) to calf thymus DNA was studied
by circular dichroism and electrochemical methods. The selectivity of a iso
mer in binding to a right-handed duplex of DNA was found. Binding constants
and binding site sizes for Delta- and Delta-[Ni(phen)(3)](2+) with DNA wer
e determined from voltammetric data.