Incorporation of the three synthetic hemins, Fe(II1) meso-tetraalkylporphyrins with the methyl, ethyl, or n-propyl groups, into apomyoglobin was followed by spectrophotometry, and the stoichiometric complex formation was confirmed. The reconstituted myoglobins bind with an equimolar amount of cyanide to exhibit visible absorption peaks at 419, 570, and 608 nm. The spectral feature was independe...

Crystal structures of the complexes formed between cytochrome c peroxidase and cyanide, nitric oxide, carbon monoxide, and fluoride have been determined and refined to 1.85 A. In all four complexes significant changes occur in the distal heme pocket due to movement of Arg-48, His-52, and a rearrangement of active site water molecules. In the cyanide, nitric oxide, and carbon monoxide complexes,...

A series of coordination compounds has been prepared comprising manganese, iron, nickel, and zinc bound by a hexaanionic cryptand where carboxamides are anionic N-donors. The metal complexes have been investigated by X-ray crystallography, and possess metal centers in trigonal monopyramidal geometries with intermetallic distances spanning d(Mn,avg) = 6.080 Å to d(Ni,avg) = 6.495 Å. All complexe...

Crystal structures of the complexes formed between cytochrome c peroxidase and cyanide, nitric oxide, carbon monoxide, apd fluoride have been determined and refined to 1.85 A. In all four complexes significant changes occur in the distal heme pocket due to movement of Arg-48, His-52, and a rearrangement of active site water molecules. In the cyanide, nitric oxide, and carbon monoxide complexes,...

Two cyanide-bridged enantiopure one-dimensional single chain complexes, [Mn((R,R)-Salcy)Fe(pcq)(CN)3]2n·1.5nDMF (1) and [Mn((S,S)-Salcy)Fe(pcq)(CN)3]2n·1.5nDMF (2), have been synthesized and structurally characterized. Systematically magnetic investigations show the antiferromagnetic coupling between the cyanide-bridged Mn(III)-Fe(III) centers and the interesting metamagnetic behavior at about ...

The complexes [Ru(CN)4(HAT)]2-, [{Ru(CN)4}2(mu2-HAT)]4- and [{Ru(CN)4}3(mu3-HAT)]6- (HAT = hexaaza-triphenylene) contain four, eight and twelve externally-directed cyanide ligands, respectively; they show strongly solvatochromic and intense MLCT absorptions, and [3]6- forms a high-dimensionality cyanide-bridged coordination network with Nd(III), in which Ru --> Nd energy transfer results in sen...

Soils on sites of former manufactured gas plants are usually contaminated with iron-cyanide complexes. We investigated the extraction of cyanide from 23 contaminated soils by three methods, which are prescribed by the German Federal Soil Protection Act and Ordinance: the soil-saturation extract with water, SSE, with a very narrow soil:solution ratio; the so-called S4 water extract with a soil:s...

Wastewater discharged from metal-finishing processes usually contains cyanide, a hazardous substance that is used extensively in the surface finishing industry. In the present study, a synthetic solution resembling the contaminated wastewater was chemically treated using ferrous sulfate. This simple one-step process was applied successfully to remove cyanide from metal finishing wastewater. The...

Rapid injection of pyruvonitrile or benzoyl cyanide into solutions of Me2CuLi in THF-d8 at -100 °C gave complexes that were stable at this temperature. 1D NMR with multiply labelled substrates ((13)C/(15)N) and 2D NMR ((1)H/(13)C) identified them as the first cuprate-carbonyl π-complexes.

A native cyanide-degrading bacterial consortium was isolated from goldmine tailing sediments. Mine tailings are toxic effluents due to their metal–cyanide complexes. The able degrade an initial sodium cyanide concentration ranging 5 120 mg L−1 in alkaline synthetic wastewater (pH > 9.2), for a maximum of 15 days. free biodegradation efficiency 98% the highest tested and followed first-order ...