Nitrogen fixation in solution

Bazhenova, T. A.; Шилов, А. Е.

doi:10.1016/0010-8545(95)01139-g

Cited by 346 publications

(228 citation statements)

References 84 publications

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“…In this connection it is also relevant to note that there has been several reports on the protolysis of N 2 containing transition metal complexes under strongly reducing conditions. [41][42][43] The possibility that we will discuss in the following is whether a process like the one shown in Fig. 2 is possible directly on a metal surface in particular if extra energy is fed into the reaction electrochemically.…”

Section: Figmentioning

confidence: 99%

Ammonia synthesis at low temperatures

Rod¹,

Logadóttir²,

Nørskov

2000

The Journal of Chemical Physics

227

185

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Density functional theory ͑DFT͒ calculations of reaction paths and energies for the industrial and the biological catalytic ammonia synthesis processes are compared. The industrial catalyst is modeled by a ruthenium surface, while the active part of the enzyme is modeled by a MoFe 6 S 9 complex. In contrast to the biological process, the industrial process requires high temperatures and pressures to proceed, and an explanation of this important difference is discussed. The possibility of a metal surface catalyzed process running at low temperatures and pressures is addressed, and DFT calculations have been carried out to evaluate its feasibility. The calculations suggest that it might be possible to catalytically produce ammonia from molecular nitrogen at low temperatures and pressures, in particular if energy is fed into the process electrochemically.

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Section: Figmentioning

confidence: 99%

Ammonia synthesis at low temperatures

Rod¹,

Logadóttir²,

Nørskov

2000

The Journal of Chemical Physics

227

185

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show abstract

“…Although such a transformation is feasible, as evidenced by the biosynthesis of ammonia enabled by nitrogenase enzymes [1][2][3][4], the activation of dinitrogen on transition metal complexes is not trivial and the best man-made homogeneous catalysts for ammonia synthesis can perform only several dozens of catalytic turnovers [5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Silylation of Dinitrogen Catalyzed by Hydridodinitrogentris(Triphenylphosphine)Cobalt(I)

Dzik

2016

Inorganics

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Abstract:Recently, homogeneous cobalt systems were reported to catalyze the reductive silylation of dinitrogen. In this study the investigations on the silylation of dinitrogen catalyzed by CoH(PPh 3 ) 3 N 2 are presented. We show that in the presence of the title compound, the reaction of N 2 with trimethylsilylchloride and sodium yields, on average, 6.7 equivalents of tris(trimethylsilyl)amine per Co atom in THF (tetrahydrofuran). The aim was to elucidate whether the active catalyst is: (a) the [Co(PPh 3 ) 3 N 2 ]´anion formed after two-electron reduction of the title compound; or (b) a species formed via decomposition of CoH(PPh 3 ) 3 N 2 in the presence of the highly reactive substrates. Time profile, and IR and EPR spectroscopic investigations show instability of the pre-catalyst under the applied conditions which suggests that the catalytically active species is formed through in situ modification of the pre-catalyst.

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“…These models are often based on low-molecular-weight compounds, such as metal complexes and metal hydroxide compounds. Important studies on the fixation of N 2 have been carried out by Shilov and Bazhenova: [9] [10] Numerous experiments to reduce N 2 in nonaqueous environments have been made [11] since the pioneering work of Chatt et al [12] A stepwise reduction of an end-on coordinated dinitrogen molecule via diazenido and hydrazido intermediates has been described. [13] Sellmann et al synthesized a diiron diazene complex containing two pentadentate NS 4 ligands and characterized it by X-ray structure determination.…”

mentioning

confidence: 99%