Kinetic studies on H+-catalysed aquation of chromium(III)-oxalato-asparaginato and chromium(III)-oxalato-histidinato complexes

Aquation reaction of iminodiacetate complex of oxidovanadium(IV) with 2,2’-bipyridine induced by Fe(III) ions: Kinetic studies

“…Recently, interest in the kinetics of the complexation reaction of transition metal compounds has increased. [1][2][3][4][5][6][7][8] For many coordination compounds, the aquation requires the introduction of a special promoter. The substitution reaction of complex compounds with special promoters may occur in acidic (the promoters are H + ions) or basic (the promoters are OHions) media or may be induced with Fe 3+ ions.…”

“…The substitution reaction of complex compounds with special promoters may occur in acidic (the promoters are H + ions) or basic (the promoters are OHions) media or may be induced with Fe 3+ ions. [1][2][3][4][5][6][7][8] Polycarboxylic anions are a group of organic compounds which are used in coordination chemistry as ligands, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] because they stabilize metal ions in solutions 14 and, moreover, they are noncytotoxic. 15 Furthermore, the polycarboxylate coordination compounds of cobalt(II), nickel(II), 12,16,18 oxidovanadium(IV), 15,17 and copper(II) 19,20 have interesting antioxidant, antibacterial, and antifungal activities.…”

“…The substitution reaction of complex compounds with special promoters may occur in acidic (the promoters are H + ions) or basic (the promoters are OH – ions) media or may be induced with Fe 3+ ions. 1–8…”

Optimization of Reaction Parameters for the Synthesis of Chromium Methionine Complex Using Response Surface Methodology

“…Compared to inorganic forms, organic forms are easier to be utilized by mammals and have higher biological activity. The most popular form is chromium(III) picolinate; however, the nutritional function of chromium(III) picolinate is still controversial because of conflicting clinical data. − Consequently, the preparation of higher bioactive and safer organically bound chromium, such as chromium methionine complex, is necessary and significant for the medical use of chromium …”

“…6−8 Consequently, the preparation of higher bioactive and safer organically bound chromium, such as chromium methionine complex, is necessary and significant for the medical use of chromium. 9 Methionine (Met) has a big advantage over picolinate as it is a naturally occurring and essential amino acid, which is indispensable for normal growth of mammals. Met can effectively eliminate the free radicals in the body, normalize the hematocrit, improve weight, and suppress abnormal activities of enzymes.…”