Abstract
AbstractA number of terminal N‐alkylated linear tetraaza and pentaaza ligands were prepared. Their ligand protonation constants and some transition and post‐transition metal (Ni2+, Cu2+, Zn2+, and Cd2+) complex stability constants were determined by potentiometric titration methods. In general, methylation and ethylation at the terminal nitrogen atoms caused the corresponding ligand nitrogen basicity to increase; however, the corresponding metal complex stabilities were decreased compared to the non‐alkylated structural analogs, presumably due to a steric effect.
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