Azides systems

I think in the current paper, Dr. Wilmarth s paper worked on by Dr. Haim, the acid catalysis of the aquation of the azide system is an example of what I call an off-site reaction. The attachment of hydrogen to nitrogen, which is three atoms away from the cobalt atom bringing about a weakening of the cobalt nitrogen bond and—if I remember the figures correctly—a 3500-or 5800-fold increase in the rate of aquation. 

I also hope that someone would comment regarding Dr. Yalman s comments about the reaction between the nitrite ion and the azido complex. One finds that the scavenging activity of—I believe it was bromide and thiocyanate—is much more effective in the presence than in the absence of nitrite in the azide system. The... 

Bridging ligands such as cyano and azido are used to form one-, two-, and three-dimensional polymeric systems and represent a fast growing research field because of their interesting magnetic properties. In addition to the polymeric binary dicyanamide and azide systems, for example, [Mn N(CN)2 2], [Mn N(CN)2 3], and [Mn(N3)3]-, ancillary organic ligands, such as pyrazine, 4,4 -bipy and 2,2 -bipy have been extensively used to create other lattice types. 

Another important route to the imidoyl azide system is by diazotization of amidrazones (185) via the hydrazine form (186 Scheme 29). The resultant imidoyl azides (187) generally cyclize immediately to substituted tetrazoles US8) and a variety of such systems has been... 

Typical current-voltage characteristics reflected the nonohmic nature of the Au/lead azide system. (Gold forms a nonohmic contact with lead). The voltage... 

There is no experimental information on the enthalpy and entropy of reaction for the species formed in the Th(lV)-azide system. 

Early kinetic measurements on the thermal anation of [Co(CN)5(HiO)] by anionic nucleophiles (Y = N3", SCN ) indicated that substitution proceeded with a less-than-first-order dependence on [Y] and approached a limiting rate at high concentrations. This, together with the substantial agreement between the limiting rates for the thiocyanate and azide systems and the apparent water-exchange rate on [Co(CN)s(H20)] , indicated that substitution occurred via a limiting... 

Stability constant measurements for the aqueous Zn -azide system indicate that four mononuclear complexes of moderate stability are formed, whereas for mercury, maximum coordination of only two azide ligands is observed. Complexation of Cd " in aqueous NOJ-NJ yields the mixed species [Cd(N03)(N3) ] ( = 1-4). Crystallographic structural determinations of A2Zn(Ns)4 (A = K or Cs) have been reported the former exhibits isolated Zn(Ns)4 tetrahedra with linear azide (N—N = 1.18 A). Thermal decomposition of the above compounds yields nitrogen and ZnsN2 as the main products. A new a modification of Zn(Na)2 has been obtained by the use of an ethereal solution of The compounds and ZnLC (M = Zn or Cd X = halide or pseudohalide L =... 

Dr. Holt from Lawrence Livermore National Laboratory in works [15—18], published in 1983-1984, has offered, irrespective of works of the SSTU, a similar idea on the use of sodium azide during burning. Under the direction of Dr. J.B. Holt s was investigated the Metal Oxide — Metal Reducing Agent — Sodium Azide system usability, apart from Metal - Sodium Azide systems, for the production of nitrides in a combustion mode. 

The experiments have shown that complexing halides of ammonia and elements to be nitrided are most effective in SHS azide systems today. Additional introduction of ammonia group can considerably increase the final product quality due to significant gas generation and the fact that the reaction mostly occurs in gas phase. 

The analysis of research results when using various classes of hahdes in azide systems SHS makes it possible to make the following conclusions. 

The presence of multizoned structure of a wave of burning is typical for it. The typical kind of burning oscillogram of azide systems SHS is given in Figure 8.1. 

Figure 8.1 Typical oscillograms of burning azide systems SHS. T, - temperature of reaction of burning in the first wave (temperature of interaction of components of an oxidizer) Tj - temperature of reaction of burning in the second wave (temperature of formation of a...

The goai of this work is to investigate the acquisition of the titanium nitride nanopowder in the ammonium hexafluorotitanate - sodium azide system. In this case, the stoichiometric equation of the chemical reaction is as follows ... 

Thus, the titanium nitride powder in the halide-sodium azide system is synthesized in the form of nanostructured particles. They can have a nanofiber structure with fibers 50-100 nm in diameter and a nanocrystalline structure with an average crystallite size of 100-200 nm. 

Most kinetic determinations of anions involve the iodide ion, which exhibits a strong catalytic effect on the reaction between cerium(IV) and arsenic(III) and a few others as a result of the redox properties of the I2/ I couple. Other anions that can be determined using their intrinsic catalytic effect include sulfur-containing species such as sulfite, sulfide, and thiosulfate, which are quantified by means of the iodine/sodium azide system, and phosphates, which are measured through their effect on the formation of molybdenum blue. Table 5 gives illustrative examples of determinations for these anions and a few others. 

In the chloro-system both tetrahedral C0CI2 and [C0CI4]— have been found and the occurrence of autocomplex formation is indicated. These findings in solution are also in accordance with the formulation of the solid solvate as [Co(DMSO)6][CoCl4]. The analogous coordination forms are found also in the azide systems. The... 

Hexacoordination is maintained in the nickel-azide system in acetonitrile and in trimethjd phosphate, where species of general formula [Ni(N3)aD6-a] are present. The azido-complexes show lower stabilities in DMSO than in AN since reasonable competition is provided by the strong donor solvent molecules27 28 [Ni(N3)4]2- seems to have a distorted octahedral arrangement with 2 DMSO molecules coordinated at the apices of the octahedron. Thus [Ni(N3)4]2- may be considered as planar with respect to azide-coordination, as is known in [Ni(CN)4]2 . The preferred hexacoordinated arrangements in all three solvents may be favoured by the small size of the azide ions and by Tu-bonding contributions in the metal azide bonds27. 

Analogous results were secured in the thermal ring-opening reaction of the corresponding diphenyl-substituted azirine 346/ 2-Vinyl-substituted 2H-azirines have also been suggested as intermediates in the thermolysis of a number of substituted butadienyl azide systems. ... 

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