Manganese complexes azides

Narang, K. K. et al., Synth. React, lnorg. Met.-Org. Chem., 1996, 26(4), 573 The explosive properties of a series of 5 amminecobalt(III) azides were examined in detail. Compounds were hexaamminecobalt triazide, pentaammineazidocobalt diazide, cis- and fram-tetraamminediazidocobalt azide, triamminecobalt triazide [1], A variety of hydrazine complexed azides and chloroazides of divalent metals have been prepared. Those of iron, manganese and copper could not be isolated cobalt, nickel, cadmium and zinc gave products stable at room temperature but more or less explosive on heating [2],... 

Irradiation of manganese azides derived from Mn(III) porphyrin, cyclam, and polyamide complexes represents one of the earliest methods reported for the preparation of nitrido manganese complexes (Eq. (40)) [50], Additional methods have become available for the synthesis of manganese nitrides that utilize ammonia in combination with oxidants such as Cl2, PhIO, NaCIO, and NBS (Eq. (41)) [51-53]. Employing these methods, the manganese nitrides incorporating porphyrin, phath-locyanine, cyclam, salen, and bidentate Schiff base complexes have been documen-... 

Crystal structures of manganese catalases (in the (111)2 oxidation state) from Lactobacillus plantarum,its azide-inhibited complex, " and from Thermus thermophilus have been determined. There are differences between the structures that may reflect distinct biological functions for the two enzymes, the L. plantarum enzyme functions only as a catalase, while the T. thermo-philus enzyme may function as a catalase/peroxidase. The active sites are conserved in the two enzymes and are shown schematically in Figure 32. Each subunit contains an Mu2 active site,... 

One of the earliest Schiff base macrocycles to exhibit a haemocyanine-like structure was the copper(II) perchlorate complex of 5.5 which binds readily to azide or hydroxide.8 The azide complex exhibits two square pyramidal copper binding domains with the basal plane occupied by one pyridyl nitrogen atom and two imine functionalities as well as a terminal azide ligand. The apices of the two pyramidal coordination polyhedra are linked by a single bridging azide anion. Continuing the biomimetic theme, manganese (II) cascade complexes of the unsymmetrical 5.6 have... 

Ce, Ni, Co, Cu, Cr207, and UO2 ) also interfere. Fe(lll) ions are masked as a colourless complex by phosphoric acid. The effect of Fe(lII) on the determination of manganese as Mn04 has been studied in detail [13]. Interference from coloured ions other than Ce(IV) is overcome by measuring the absorbance before and after reduction of the Mn(VlI) by sodium azide (20-30 mg NaN3), hydrogen peroxide, or sodium nitrite. 

Nalbandyan, 1982 Hodgson and Fridovich, 1975 Asada et al., 1975), whereas azide inhibits the enzymes in the following order iron > manganese > copper/zinc superoxide dismutase (Misra and Fridovich, 1978). Diethyldithiocarbamate is another well-characterized inhibitor of the copper/zinc superoxide dismutase (Heikkila et al., 1977). It forms a complex with the copper and removes the metal from all the protein ligands. The copper-diethyldithiocarbamate complex can be separated without affecting the zinc content of the protein (Cocco et al., 1981). 

Manganese(tl) complexes,, 3, 9-82 acctylacetonates, 48 acetylides, 14 alcohols, 37 alkoxides, 37 alkyl phosphines, 13 alkyls, 12 amides, 15, 16 amine oxides, 39 amines, 16 amino acids, 43, 62 sulfur containing, 70 ammines, 15 antimony ligands, 31-34 arsenates, 4,5, 46 arsenic ligands, 31-34 arsenic oxides, 39 aryls, 12, 14 azides, 22 binary alkyls, 13 bipyridyl, 24, 25 anions, 25... 

The ESR spectrum of Mn in sodium azide [28] shows a remarkable similarity to that of Mn in sodium chloride. In both cases the divalent manganese ion is located substitutionally at a monovalent sodium ion site, and the extra positive charge is compensated by a cation vacancy. The same mobility and coagulation effects are seen for both materials, and multiple sets of Mn —cation vacancy complexes are also observed. Vacancy hopping, which produces lifetime broadening of the resonance lines, is observed in NaNa (as well as in potassium and rubidium azides). As mentioned earlier. Miller and King [13] used the ESR spectrum of Mn " to observe the phase transition at 19°C. 

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