L. Menabue, M. Saladini, P. Morini
1989
Citations
0
Influential Citations
4
Citations
Journal
Polyhedron
Abstract
Abstract From the interaction between N-tosyl- dl -asparagine (TsasnH), N-tosyl- l -glutamine (TsglnH) (tosyl = 4-toluenesulphonyl) and copper(II) ion in aqueous solution, compounds of formula CuL 2 ·XH 2 O·YC 2 H 5 OH (L = tosyl-α-aminoacidate monoanion), Cu(LH –1 )·2H 2 O (LH –1 = tosyl-α-aminoacidate dianion) and K 2 [Cu(LH –1 ) 2 ] were isolated. By potentiometric and spectrophotometric measurements, the number and type of complex species and their cumulative formation constants were determined. The treatment of data confirmed, also in solution, the formation of the complexes separated in the solid state and defined the pH range in which they are stable. The coordination behaviour of these ligands is compared with that of parent amino acids and other N-tosyl-derivatives.