Cobalt-phenanthroline

Carter et al [77] also investigated cobalt phenanthroline and DNA interactions in their previous paper which contained explanations about the dependence of the redox behavior on the nature of the ligands coordinated to the metal center. 

Figure 7.42. Cobalt-phenanthroline Co(phen)3 (left). Incorporation into minor groove of DNA (right)...

Figure 7.43. Hybridization detection by means of reporter molecule cobalt phenanthroline...

Karadeniz H, Guhnez B, Erdem A, Ozsoz M, Palecek E (2006) Echinomycin and cobalt-phenanthroline as redox indicatius of DNA hybridizatitm at gold electrodes. Eront Biosci 11 1870-1877... 

Hawecker et a/.141 used Re(bpy)(CO)3X (X = Cl, Br) complexes as photosensitizers and succeeded in improving markedly the efficiency of CO formation using a system similar to that described above, where DMF was used as a solvent and 2,9-dimethyl- 1,10-phenanthroline was added, as a ligand for the cobalt ion, to a solution containing Ru(bpy)3+, Co2+, and triethanolamine. 

Preparation by oxidising tris(phenanthroline)cobalt(III) tetrafluoroborate with nitric acid in sulfuric acid with potassium bromide catalysis is potentially explosive. See Nitric acid... 

Using the tri-iodide/iodide redox couple and the sensitizers (22) and (56), several groups have reported up to 8-10% solar cell efficiency where the potential mismatch between the sensitizer and the redox couple is around 0.5 V vs. SCE. If one develops a suitable redox couple that decreases the potential difference between the sensitizer and the redox couple, then the cell efficiency could increase by 30%, i.e., from the present value of 10% up to 13%. Towards this goal, Oskam et al. have employed pseudohalogens in place of the triiodide/iodide redox couples, where the equilibrium potential is 0.43 V more positive than that of the iodide/iodide redox couple.17 Yamada and co-workers have used cobalt tris-phenanthroline complexes as electron relays (based on the CoII/m couple) in dye-sensitized solar cells.95... 

Trihydrazinecobalt(II) nitrate, 4205 Trihydrazinenickel(II) nitrate, 4592 Tris(2,2/-bipyridine)chromium(II) perchlorate, 3874 Tris(2,2/-bipyridine)silver(II) perchlorate, 3873 Tris(2,3-diaminobutane)nickel(II) nitrate, 3589 Tris(l,2-diaminoethane)chromium(III) perchlorate, 2619 Tris(l,2-diaminoethane)cobalt(III) nitrate, 2622 Tris(l,2-diaminoethane)ruthenium(III) perchlorate, 2621 Tris(4-methoxy-2,2/bipyridine)ruthenium(II) perchlorate, 3886 Tris(3-methylpyrazole)zinc sulfate, 3540 Tris(l,10-phenanthroline)cobalt(III) perchlorate, 3890 Tris(l,10-phenanthroline)ruthenium(II) perchlorate, 3889... 

As an active initiator for a co-polymerization, acyl-cobalt complexes also work well. As demonstrated by Alper and Lee, an equimolar mixture of Go2(GO)s, benzyl bromide (BnBr), and dihydro-1,10-phenanthroline 17, possibly generating BnGOGo(GO)4 under the reaction conditions, co-polymerized PO or 1,2-butene oxide with GO, and the... 

Murray et al. (2) prepared permeable membranes for selectively removing phosphate, nitrate, and ferric cations by polymerizing and crosslinking with the modified matrix monomer, (bis-acrylamindo-phenanthroline)dinitrate, (IV), to produce an ion permeability substrate. Kulkami et al. (3) selectively removed cobalt cations from solution using 2-hydroxy ethyl methacrylate copolymers,... 

It has long been known that, when bound to cobalt(II), the pyridine-based chelate ligands 2,2 -bipyridine (bipy), 1,10-phenanthroline (phen), and 2,2 6, 2"-terpyridine (terpy) form complexes that react with dioxygen in aqueous solution (32-34). The mixed-ligand complexes [Co(terpy)(bipy)]2+ and [Co(terpy)(phen)]2+ can act as oxygen carriers in aqueous solutions at pH values as low as 3.0 (34b), and the superoxo species thus formed are apparently dinuclear. In addition, the dinuclear bipyridine complex [(bipy)2Coin(/ 2-0 )(/ 2-02 )CoIn(bipy)2 ]3+ has been shown to catalyze the oxidation of 2,6-di-ter -butylphenol to the feri-butyl-substituted diphenoquinone and quinone (35). 

A much milder route to 5-nitro-1,10-phenanthroline involves nitration of the tris-phenanthroline complex of cobalt(III) which is readily nitrated in concentrated sulfuric acid at 80°. The free 5-nitro-l,10-phenanthroline can be isolated in 70% yield from the nitrated complex.276... 

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