41587-80-8

Upstream product

• 15878-95-2 tris(2,2'-bipyridyl)cobalt(II) 
• 62651-67-6 Ru((CH₃)4C₁₂H₄N₂)3⁽³⁺⁾ 
• 41673-52-3 tris(1,10-phenanthroline)ruthenium(III)⁽³⁺⁾ 
• 75-05-8 acetonitrile 
• 66-71-7 1,10-Phenanthroline 
• 168749-89-1 [Co(OH)(H₂O)(2,2'-bipyridyl)2]⁽²⁺⁾ 
• 23641-57-8 [CoCl₂(2,2'-bipyridyl)2]⁽¹⁺⁾ 

Downstream Products

• 14099-01-5 rhenium(I) pentacarbonyl chloride 
• 15878-95-2 tris(2,2'-bipyridyl)cobalt(II) 
• 366-18-7 [2,2]bipyridinyl 
• 113162-16-6 Co(H₂O)⁽²⁺⁾ 
• 22541-53-3 cobalt(II) 

Relevant academic research and scientific papers

First investigation at elevated pressures to confirm the exact nature of the gated electron-transfer systems: Volume profiles of the gated reduction reaction and nongated reverse oxidation reaction involving a [Cu(dmp) 2(solvent)]2+/[Cu(dmp)2]+ couple (dmp = 2,9-Dimethyl-1,10-phenanthroline)

Redox reactions involving the [Cu(dmp)2]2+/+ couple (dmp = 2,9-dimethyl-1,10-phenanthroline) in acetonitrile were examined at elevated pressures up to 200 MPa. Activation volumes were determined as -8.8 and -6.3 cm3 mol-1 for the reduction cross-reaction by [Co(bipy)3]2+ (bipy = 2,2′-bipyridine) and for the oxidation cross-reaction by [Ni(tacn)2]3+ (tacn = 1,4,7-triazacyclononane), respectively. The activation volume for the hypothetical gated mode of the self-exchange reaction estimated from the reduction cross-reaction was -13.9 cm3 mol-1, indicating extensive electrostrictive rearrangement of solvent molecules around the Cu II complex during the change in the coordination geometry before the electron-transfer step. On the other hand, the activation volume for the self-exchange reaction estimated from the oxidation cross-reaction was -2.7 ± 1.5 cm3 mol-1. Although this value was within the range that can be interpreted by the concept of the ordinary concerted process, from theoretical considerations it was concluded that the reverse (oxidation) cross-reaction of the gated reduction reaction of the [Cu(dmp) 2(CH3CN)]2+/ [Cu(dmp)2]+ couple proceeds through the product excited state while the direct self-exchange reaction between [Cu(dmp)2(CH3CN)]2+ and [Cu(dmp)2]+ proceeds through an ordinary concerted process.

Homogenous Catalysis of the Photoreduction of Water. 6. Mediation by Polypyridine Complexes of Rhuthenium(II) and Cobalt(II) in Alkaline Media

The emission of (polypyridine)rhutenium(II) complexes (S) is quenched by (polypyridine)cobalt(II) (CoL32+) complexes via parallel oxidative, reductive, and energy-transfer paths, giving CoL3 +S+, CoL33+ + S-, respectively.The oxidative route provides the basis for a new water photoreduction sequence: in mixed acetonitrile-water solvents relatively high cage-escape yields of Ru(4,7-(CH3)2phen)33+ and Co(bpy)3+(S = Ru(4,7-(CH3)2phen)32+, phen = 1,10-phenanthroline, bpy = 2,2'-bipyridine) are obtained.The Ru(III) complex is reduced by triethanolamine (TEOA), and the Co(bpy)3+ reacts with water and/or TEOAH+ to give H2. the maximum H2 quantum yield obtained is 0.29 in 50percent acetonitrile-water.Unusual features of the system are the fact that, at low TEOA, Co(bpy)32+ scavenging of Ru(III) reduces the H2 yield and that the cage-escape and limiting H2 yields are strongly solvent dependent: for the Ru(4,7-(CH3)2phen)32+-Co(bpy)32+-TEOA system the H2 yield increases from cca.0.02 in H2O to 0.29 in the mixed solvent.Reduction potentials for CoL33+/2+ and CoL32+/+ couples are also reported.