Electrochemical investigation of tris(2,2'-bipyridine) complexes of chromium(III)

Soignet, Donald M.; Hargis, L. G.

doi:10.1021/ic50116a012

Cited by 13 publications

(9 citation statements)

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“…, 11, 880(1972). We have prepared franj-[Ru(NH3)4(NO)Cl]Cl2 by two separate methods: via [Ru(NH3)4(NO)OH]C12 12 and by the direct reaction of NO with frans-[Ru(NH3)4Cl2]Cl. The spectra which we obtained were identical: Xmax ( , "1 cm"1) 453 (17), 315 (90), 245 (4.3 X 103).…”

Section: Resultsmentioning

confidence: 99%

Preparation and characterization of a new series of cis nitrosylruthenium complexes

Pell¹,

Armor²

1973

Inorg. Chem.

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Section: Resultsmentioning

confidence: 99%

Preparation and characterization of a new series of cis nitrosylruthenium complexes

Pell¹,

Armor²

1973

Inorg. Chem.

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“…Although no evidence for the tris complex was observed in the CV, this has been observed previously after prolonged electrolysis, and the scheme shown in Scheme 2 was proposed. 6 cis-[Cr(bpy) 2 (OH 2 )(OH)] 2+ has known pK a values of 3.5 and 6.1. 16a Therefore, in solution at neutral pH it will largely be in the bis-hydroxo form, and thus singly charged.…”

Section: Common Features Of Cyclic Voltammograms At Glassy Carbon (Gc...mentioning

confidence: 99%

“…Reduction of [Cr(bpy) 3 ] 3+ by one electron results in substitution of one or more of the bipyridine ligands by coordinated water takes place initially via an EC mechanism (where E = electrochemical [reduction] step, C = chemical [ligand substitution] step) as in the C1 step of Scheme 1. [6][7][8] In fact, the inclusion of the homogeneous electron transfer step C2 in Scheme 1 satisfies the criteria for an ? ECE / reaction of the type first described by Feldberg and Jeftic.…”

Section: Introductionmentioning

confidence: 99%

Electrochemistry and surface-enhanced Raman spectroscopy (SERS) of adsorbed chromium–bipyridyl complexes†

Taylor¹,

Crayston²,

Dines³

1998

Analyst

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= polyacrylic acid) were studied at silver and glassy carbon electrodes by cyclic voltammetry. On reduction, slow electron transfer reactions giving adsorbed species are evident from the cyclic voltammograms. In situ surface-enhanced Raman spectroscopy (SERS) of the aquahydroxo and dimer complexes shows a broad, intense Cr-O vibration at around 550 cm 21 . This arises as the exciting line (514.5 nm) is close to resonance with the lowest energy absorption band assigned to a ligand field transition ( 4 A 2g ? 4 T 2g ). At 20.4 V SERS spectra show features of both the normal Raman spectrum of [Cr(bpy) 3 ] 3+ and the colloidal SERS of [Cr(bpy) 3 ] 2+ and can be explained by the presence of partially-reduced adsorbed species. The electron is localized first on to the metal and then on to one of the bpy ligands as follows: [Cr III (bpy 0 ) 2 X 2 ] n+ + e ?[Cr II (bpy 0 ) 2 X 2 ] (n21)+ and [Cr II (bpy 0 ) 2 X 2 ] (n21)+ + e ?[Cr II (bpy 2 )(bpy 0 ) 2 X 2 ] (n22)+ . Although the SERS evidence suggested that the integrity of the complexes is maintained during the reaction, prolonged electrolysis leads to hydrolysis and/or substitution of the complexes. Thus [(PVP) 2 -Cr(bpy) 2 ] 3+ can be electrosynthesized by reduction of cis-[Cr(bpy)Cl 2 ] + at a PVP modified glassy carbon electrode and shows a characteristic peak at 20.32 V.

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“…6 A cyclic voltammogram of a solution of the unreduced bis complex, taken over a voltage range of -0.20 to -0.85 V and at a scan rate of 0.1 V/sec, contained a single cathodic wave (1) at -0.80 V on the first cathodic sweep. On the reverse anodic sweep, two anodic waves were observed, one at -0.68 V (2) and the other at -0.43 V (3). On the second and all subsequent scans, a second cathodic wave (4) appeared at -0.54 V. The ratio of peak currents between waves 3 and 1 was affected only slightly by temperature but significantly by pH (see Figure 2).…”

Section: Resultsmentioning

confidence: 99%

Electrochemical investigation of the dichlorobis(1,10-phenanthroline)chromium(III) complex ion

Soignet¹,

Hargis²

1975

Inorg. Chem.

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Electrochemical investigation of tris(2,2'-bipyridine) complexes of chromium(III)

Cited by 13 publications

References 1 publication

Preparation and characterization of a new series of cis nitrosylruthenium complexes

Preparation and characterization of a new series of cis nitrosylruthenium complexes

Electrochemistry and surface-enhanced Raman spectroscopy (SERS) of adsorbed chromium–bipyridyl complexes†

Electrochemical investigation of the dichlorobis(1,10-phenanthroline)chromium(III) complex ion

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