A Copper(I) N,N,N′,N′′,N′′-Pentamethyldiethylenetriamine Complex and Its Carbon Monoxide Adduct in Aqueous Solutions.

Copper(I) ion forms a stable 1:1 complex with pmdien (2,5,8-trimethyl-2,5,8-triazanonane, in CO-saturated or CH 3 CN-containing aqueous solutions, due to the formation of a stable 1:1 CO or CH 3 CN adduct. The formation constants of [Cu-(pmdien)(CO)] + and [Cu(pmdien)(NCCH 3 )] + have been established by the pH-metric titration and polarographic methods