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 CuL2·XH2O·YC2H5OH (L = tosyl-α-aminoacidate monoanion), Cu(LH–1)·2H2O (LH–1 = tosyl-α-aminoacidate dianion) and K2[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.
Influence of 4-toluenesulphonyl group on the coordination properties of DL-asparagine and L-glutamine / Menabue, Ledi; Saladini, Monica; P., Morini. - In: POLYHEDRON. - ISSN 0277-5387. - STAMPA. - 8:(1989), pp. 739-744. [10.1016/S0277-5387(00)83841-3]
Influence of 4-toluenesulphonyl group on the coordination properties of DL-asparagine and L-glutamine.
MENABUE, Ledi;SALADINI, Monica;
1989
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 CuL2·XH2O·YC2H5OH (L = tosyl-α-aminoacidate monoanion), Cu(LH–1)·2H2O (LH–1 = tosyl-α-aminoacidate dianion) and K2[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.
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