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Tris(4,4'-dimethylbipyridine)chromium(III), also known as [Cr(4,4'-Me2bpy)3]3+, is a coordination complex consisting of a central chromium(III) ion coordinated to three 4,4'-dimethyl-2,2'-bipyridine ligands. This complex is widely used as a redox indicator in titrations, particularly in the determination of iron(II) ions. It exhibits a color change from violet in its reduced form to blue-green in its oxidized form. The complex is also known for its potential applications in solar energy conversion and as a catalyst in various chemical reactions. Its stability and unique electronic properties make it a subject of interest in inorganic chemistry and materials science.

58220-56-7

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58220-56-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 58220-56-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,8,2,2 and 0 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 58220-56:
(7*5)+(6*8)+(5*2)+(4*2)+(3*0)+(2*5)+(1*6)=117
117 % 10 = 7
So 58220-56-7 is a valid CAS Registry Number.

58220-56-7Downstream Products

58220-56-7Relevant academic research and scientific papers

Oxidation of a series of tris(polypyridyl)chromium(II) ions by several cobalt(III) complexes

Zahir, Khurram,Espenson, James H.,Bakac

, p. 3144 - 3146 (2008/10/08)

The kinetics of the outer-sphere oxidation of Cr(NN)32+ ions (NN = 2,2′-bipyridine, 1,10-phenanthroline, and their substituted derivatives) by tris(chelating ligand) complexes of Co(III) were studied. The second-order rate constants increase with the driving force of the reaction. The rate constants for Co(en)33+ at 23 ± 2°C increase from 2.2 (±0.3) × 103 M-1 s-1 for Cr(bpy)32+ to 1.1 (±0.2) × 105 M-1 s-1 for Cr(4,7-Me2-phen)32+ and agree very well with the values calculated by the Marcus cross relation. For Co(bpy)33+ and Co(phen)33+, on the other hand, the experimental rate constants are lower than the calculated values. It is suggested that the reactions of these two species are mildly nonadiabatic, the extent of nonadiabaticity increasing with an increase in the standard free energy of the reaction.

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