Hydrogen evolving systems. 2. The reduction of molecular nitrogen, organic substrates, and protons by vanadium(II)

Zones, Stacey I.; Vickrey, Thomas M.; Palmer, John G.; Schrauzer, G. N.

doi:10.1021/ja00439a029

Cited by 47 publications

(15 citation statements)

References 3 publications

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“…(7)]. Further 2 e − /2 H + reductions afford hydrazine and finally ammonia, as known from homogeneous nitrogenase models 26 SC + hν →SC(e r − , h r + ) SC(e r − , h r + ) + H 2 O→SC(h r + ) + H ad + OH − SC(e r − ) + H 2 O→SC + H ad + OH − N 2 + 2 H ad →N 2 H 2 SC(e r − , h r + )→SC + heat …”

Section: Resultsmentioning

confidence: 98%

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Nitrogen Photofixation on Nanostructured Iron Titanate Films

Rusina

Linnik

Eremenko

et al. 2003

Chemistry A European J

107

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A nanostructured iron titanate thin film has been prepared by a sol-gel method from iron(III) chloride and titanium tetraisopropylate. Energy-dispersive X-ray analysis and Mössbauer spectroscopy suggest the presence of a Fe(2)Ti(2)O(7) phase, which was previously obtained as an intermediary phase upon heating ilmenite. In the presence of ethanol or humic acids and traces of oxygen, the novel film photocatalyzes the fixation of dinitrogen to ammonia (17 microM) and nitrate (45 microM). In the first observable reaction step, hydrazine is produced and then undergoes further photoreduction to ammonia. Oxidation of the latter by oxygen affords nitrate as the final product. Since the reaction occurs also in air and with visible light (lambda>455 nm), and since the iron titanate phase may be formed by the weathering of ilmenite minerals, it may be a model for mutual nonenzymatic nitrogen fixation in nature.

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Section: Resultsmentioning

confidence: 98%

“…(3)], which then injects an electron into the conduction band affording acetaldehyde as oxidation product [Eq. [26] SC hn 3 SC(e r À , h r ) (5)].…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Photofixation on Nanostructured Iron Titanate Films

Rusina

Linnik

Eremenko

et al. 2003

Chemistry A European J

107

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“…Aqueous vanadium(II) is even more reactive than V III and even less chemistry is known about V II complexes [94,[96][97][98][99][100]. Thus, systems in which this oxidation state exists contain a very reducing environment.…”

Section: (Insert Scheme 1 Here)mentioning

confidence: 99%

High-frequency and -field electron paramagnetic resonance of vanadium(IV, III, and II) complexes

Krzystek

Ozarowski

Telser

et al. 2015

Coordination Chemistry Reviews

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In this Review, we discuss the advantages of performing electron paramagnetic resonance (EPR) on coordination and metalloorganic complexes containing various oxidation states of vanadium, from +4 to +2, using the high-frequency and-field version of this technique, known as HFEPR. Thus, HFEPR is advantageous in investigating (S = 1/2) V(IV) species due to its higher g-factor resolution over conventional EPR, albeit at the price of losing the hyperfine structure resolution due to g-strain. It is very much desirable in characterizing (S = 3/2) V(II) complexes since it is capable of precisely and accurately measuring the zero-field splitting present in these species. Finally, HFEPR is indispensable in investigating (S = 1) V(III) species, which in conventional conditions are often "EPR-silent" due to the combination of their large zero-field splitting and integer spin number. The use of HFEPR thus can provide additional information regarding the oxidation state of the metal and the coordination geometry.

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“…(i) The polyfunctionality , provided by the presence of very different reactive sites in the structure: the sodium cation is the acidic site, while vanadium in a low 6); V-0(2), 1.994(5); V-N(l), 2.u50(5); 'Y'-X(2), 2.98? (5); V-N(l*), 2.082(5); V-N(2*), 2.050 (6); Na-O(l), 2.280 (6); and Na-0(2), 2.334 (7). * = -x, -y, -2 .…”

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confidence: 99%

“…Bond distances (A): V-V*, 2.406(3); V-O(l), 2.003(6); V-0(2), 1.994(5); V-N(l), 2.u50(5); 'Y'-X(2), 2.98? (5); V-N(l*), 2.082(5); V-N(2*), 2.050(6); Na-O(l), 2.280(6); and Na-0(2), 2.334(7). * = -x, -y, -2 .…”

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