Proton/Metal–Ligand Stability Constants of Complexes of Sr(II), Cr(II), and Al(III) with N-Phthaloyl Aminoacid and Benzimidazole Derivatives in Dioxane–Water Mixture

Formation of complexes Sr(II), Cr(II), and Al(III) with ligands (1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)acetic acid (L1), 2-(1-(2-(4-nitrophenyl)-1H-benzo[d]imidazol-1-yl)-1-oxobutan-2-yl)-2,3-dihydroinden-1-one(L2) and 2-(2-(2-(4-chlorophenyl)-1H-benzo [d] imidazol-1-yl)-2-oxoethyl)isoindoline-1,3-dione (L3) investigated using pH metric technique in 70% dioxane-water mixture. Proton ligand formation number and metal-ligand formation number determined. Proton-ligand stability constants pK values and metal – ligand stability constants log k values evaluated using half integral method. It indicates that Sr(II), Cr(II), and Al(III) metal ions formed 1 : 1 and 1 : 2 complexes with the ligands L1, L2, and L3. These can be of interest for specialists in the field of coordination chemistry.