Abstract
The treatment of aromatic aldehydes with ammonia and hypophosphorus acid gave novel C2-symmetric N,N-bis(phosphinomethyl)amines as a new class of 1-aminophosphinic acid compounds. Complexation properties of N,N-bis(phosphinomethyl)amines with transition metals such as Co2+, Ni2+, Zn2+, Cu2+, and Cd2+ and lanthanide ions La3+ and Gd3+ were studied in aqueous solution by the pH-potentiometric method. Dissociation constants (pK) of the compound were determined by the pH-potentiometric technique. The complexation studies with compound dl-2a showed the best fit of the titration curves were obtained when the ligand–metal stoichiometric ratio was 1:1 and 2:1.
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