92. Complex formation in salt solutions. Part I

Polarographic Behavior of Manganese(II) in the Presence of Oxalate Ions in Perchlorate and Sulfate Solutions

“…The majority of literature studies report the stability constant only for the first oxalate complex [22][23][24][25][26][27]. Generally, the value of log 10 β 1 obtained herewith is 1.1-1.3 units lower than the corresponding values obtained by other methods, both at an ionic strength of 0.1 mol·L −1 or extrapolated to zero concentration, but is approximately equal to that obtained polarographically by Verdier and Piro [10,11].…”

Kinetics And Mechanism Of Oxidation By Permanganate

“…Malcolm and Noyes (96) propose the following mechanism, which obviates the requirement of a rapid reaction between manganous and permanganate ions: Mn2+ + C204_ MnC204 (rapid equilibrium) (15) MnC20< + -> Mn(III) + Mn04~(fast relative to (16) reaction 19) + 3Mn(II) + 8H+ -> 4Mn(III) + 4H20 (17) (very fast series of steps) + MCsO + 8H+ -> Mn(III) + 3C02 + 4H20 (18) (fast series of steps) Mn(III) -» Mn(II) + 020 (measurable) (19) Mn(III) + 020 -> Mn(II) + 2C02 (very fast) (20) Mn(II) and Mn(III) refer to any divalent and trivalent species, respectively. The intervention of manganous oxalate in the permanganate-oxalate reaction had been previously suggested by Fessenden and Redmon (49) and is in accord with the work of Money and Davies (101,102). Participation of the manganate ion, which will have a very short life in acid media, had previously been proposed by Waterbury, Hayes, and Martin (138) to allow for the radiochemical restrictions and to account for their results in the reaction between periodate and manganous ions.…”

“…will therefore be larger and the rate will be lower than for the decomposition of the MnC2OÍ complex. The validity of this reasoning is doubtful in the light of the work of Scholder and Linstrom (118) and Money and Davies (102), who find evidence for the existence of the [Mn(C204)2]2-ion, and of Brintzinger and Eckardt (26), whose work suggests the existence of the dimeric manganousoxalato complex [Mn2(C204)4]4-.…”

The Chemistry of the Metal Oxalato Complexes.

“…-Ag(I) (383) T1(I) (113) TIO * (398) MoO, * (391) NpO, + (96, 175) in...... 14(0,0,),-AI(III) (34,126) Cr(III) (438) Mn(III) (75,407) Fe(III) (22) Co(III) (7) Oa(III) (120,305) Y(I1I) (137) In(III) (292) Sb (III) (310) Ce(III) (94) Nd(III) (94) Od(III) (361) Yb(III) (93) Rh(III) (36) Ir(III) (119) Po(III) (380) Pu(III) (163) Am(III) (300) lib...... M(C,0,),'~Be(II) (386) Mg(II) (34) Ca(II) (68) Sr(II) (68) Ba(II) (68) Mn(II) (296) Fe(II) (173) Co(II) (142) Ni (II) (11,67) Cu(II) (60a, 348, 349) Zn(II) (60a, 235) Cd(II) (235,423) Pb(lT) (231) Pt(II) (172) TiO*+ (25) VO*+ (116,418) OeO>>+ (446) UO>+ (79,…”