Add time:07/13/2019         Source:sciencedirect.com

Adduct formation of Cu(chelate)2 (chelate = anion of thenoyltrifluoroacetone, TTA, and trifluoroacetylacetone, TFA) with alkylamines and alkylamine hydrochlorides, S (S = tri-n-butylamine, TBA, tri-n-hexylamine, THA, tri-n-octylamine, TOA, tri-n-laurylamine, TLA, tri-n-hexylamine hydrochloride, THA·HCl, tri-n-octylamine hydrochloride, TOA·HCl and tri-n-laurylamine hydrochloride, TLA·HCl) have been studied spectrophotometrically. Visible and i.r. spectra suggest that alkylamines and alkylamine hydrochlorides form different adducts through bonding of different atoms. In the alkylamines the nitrogen atom is bonded to copper(II) while in the alkylamine hydrochlorides the chlorine atom is bonded to copper(II). Equilibrium constants for the adduct-formation reactions are calculated from the spectral change upon addition of the adduct-forming ligands. It is found that alkylamines and alkylamine hydrochlorides do not interact with Cu(chelate)2 to the same extent. Furthermore, the complexes species, TOA·HTTA and TOA·HCl·HTTA, do not interact with Cu(chelate)2.

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