Mercury , phenanthroline complexes

A trial was made to take a look at the valence of iron in adrenodoxin (29) using 3 moles of p-chloromercuribenzoate (PCMB) per gram atom of iron (less than saturated level of PCMB), all of the iron could be extracted by 5% trichloroacetic acid solution as ferric iron, which produces a ferrous-o-phenanthroline complex only by the addition of ascorbate as reductant. In the absence of the mercurial, some 50% or more of the iron atoms in the protein can be removed in the ferrous state. This result indicates that the acid extraction causes intramolecular reduction of the protein-bound iron. As shown in Fig. 10, 5.7 M urea as a protein denaturant can slowly bleach the visible absorption under aerobic conditions. About 10% of the residual absorption remains at 414 mp after the reaction is completed. In the presence of both urea and o-phenanthroline, all of the iron present in adrenodoxin reacts with o-phenanthroline to produce the ferrous complex under aerobic conditions. Similar experiments under anaerobic conditions reveal that the... 

The helical disposition of the aromatic ligands in the tris complexes confers optical rotatory strength on the ligand transitions [372, 495). This fact may be used to arrive at the absolute configuration of the complex, e.g., (-l-)Ru(phen) + has been shown to exist as a left-handed helix [495). The optical rotatory dispersion of phenanthroline complexes of zinc, cadmium, and mercury has also been studied [419). 

Mercury, tris(l,10-phenanthroline)-structure, 64 Mercury(II) complexes masking agent, 536 Mercury electrodes potential range aqueous solution, 480 Metal carbonyls structure, 16 Metallocenes nomenclature, 126,127 Metallochromic indicators, 554 Metallofluorescent indicators, 558 Metallothionein proteins, 142 Mettd-metal bonding, 137,169 gravimetry, 525 history, 21,23 nomenclature, 122, 123 Metal nitrosyls structure, 16 Metal-phthalein metallochromic indicator, 557 Metal template reactions, 416,433 equilibrium kinetic, 434 thermodynamic, 434 Methane, dichloro-... 

Kirschner and Magnell have reported that the magnitude of the Pfeiffer effect increases for the series of tris(ort/io-phenanthroline) complexes of zinc(II), cadmium(II), and mercury(II). The stability constants of these complexes, however, have been shown to be in the reverse order, indicating that the mercury complex is the most labile of the three, and, therefore, would be expected to be able to undergo the Pfeiffer effect with the greatest facility and to the greatest extent. 

Gross, H. and Geier, G. (1987) Kinetics and equilibria of mercury(II) complexes with phenanthroline, bipyridyl and OH in aqueous solution. T-jump study with a novel computational technique for multi-step relaxation processes. Inorg. Chem., 26, 3044-3050. 

Discussion. Silver can be extracted from a nearly neutral aqueous solution into nitrobenzene as a blue ternary ion association complex formed between silver(I) ions, 1,10-phenanthroline and bromopyrogallol red. The method is highly selective in the presence of EDTA, bromide and mercury(II) ions as masking agents and only thiosulphate appears to interfere.8... 

Numerous experimental systems verified the theory of surface electrode reactions. Reductions of methylene blue [92], azobenzene [79, 82] alizarine red S [93], probucol [94], molybdenum(V)-fulvic acid complex [95], molybdeniun(VI)-1,10 phenanthroline-fulvic acid complex [96], indigo [97], and reduction of vana-dium(V) [98] at a mercury electrode are some of the examples for surface electrode... 

In the presence of 1,10-phenanthroline, Fe2+ forms a complex which has a broad absorption band centred at 510 nm. The quantum yield of the reaction is wavelength dependent, but the useful wavelength range is quite wide. The quantum yields are 1.25 at 254 nm, 1.21 at 365 nm and 1.01 at 436 nm (these being important emission lines of mercury arcs). 

These polyfluoroaryl groups enhance the acceptor properties of mercury and neutral 1 1 coordination complexes can be isolated with bipyridyl, 1,2-bis(diphenylphosphi-no)ethane, 1,10-phenanthroline, and so on [45, 63]. 

Mercury(II) forms with 1,10-phenanthroline a cationic complex which gives ion-associates with the acid dyes Rose Bengal B [57] and eosin [58] the associates have also been used for determining mercury in aqueous medium. 

Chelating agents may manifest their antiviral activity by metal sequestration and, as with bacteria and parasites, the natural differences between the host and invading cells may be exploited. Chelating agents with antiviral activity include the thiosemicarbazones, 1,10-phenanthrolines and phosphonoacetates. The latter compounds may act by zinc chelation. Metal complexes with antiviral action are platinum and palladium amines, as well as the antibacterial silver and mercury species. 

The mass of complex (0.0117 g) spread on the slide, was irradiated for 1 hour with Hanovia Chromatolite low pressure mercury lamp. After reacting with iron(Ill) chloride and phenanthroline, the absorbance of the [Fefphen) ] complex formed, measured in a 1 cm cell, was 0.847 at 510 nm. 

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