Crystallographic study on metal(II) complexes with N-(2-nitrophenylsulfonyl)glycine

The interaction of M-II ions (M-II = Mn-II, Co-II, Ni-II, Cu-II, Zn-II, Cd- II, Pb-II) with N-(2-nitrophenylsulfonyl)glycine (NO(2)psglyH(2)) leads to the formation at acidic pH of the complex carboxylate-type M(NO(2)psgly-O)( 2).xH(2)O species. At higher pH the deprotonation reaction of the sulfonami de nitrogen takes place, leading to the formation of the M(NO(2)psgly-N,O). xH(2)O species where the ligand acts as a chelating agent toward the metal ion through the carboxylic oxygen and the deprotonated sulfonamide nitrogen . In ternary systems the addition of 2,2'-bipyridine (bpy) allows the depro tonation of the sulfonamide nitrogen also in presence of metal ions such as Zn-II, Co-II and Ni-II, which were inactive in the binary system, and the solid compounds isolated are in the M/bpy/L molar ratio 1 : 1 : 1 (M-II = C u-II, Zn-II) or 1 : 2 : 1 (M-II = Co-II, Ni-II, Cd-II). Here we describe th e crystal and molecular structures of NO(2)psglyH(2) (1), [Pb(NO(2)psgly-N, O)](n) (2), [Cd(bpy)(2)(NO(2)psgly-N,O)].H2O (3) and [Cu(bpy)(NO(2)psgly-N, O)(H2O)] (4).