Sauerstoff, Wasserstoff, Kohlenstoff und Stickstoff als Pflanzennährstoffe / von P. Vageler.

Vageler, P.

doi:10.5962/bhl.title.13141

Cited by 4 publications

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“…Regarding the relationship of these compounds to plant growth, Maxwell (i) has shown the importance of phospholipin during the germination of seeds. Vageler (2) obtained evidence that there is a greater accumulation of phospholipins when blossoming and fructification is taking place, and an abundance at the time of most rapid growth.…”

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The Amounts and Distribution of some Phosphorus and Nitrogen Compounds in wheat During Growth.

Knowles¹,

Watkin²

1932

J. Agric. Sci.

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An account has been given of the lipin, phytin and inorganic phosphorus, and of the protein and non-protein nitrogen present in the wheat plant, from seven weeks before ear emergence until the crop was harvestedThe percentages and amounts of phosphorus and nitrogen so combined, together with their distribution between straw and ear, have been discussed.Relationships between phytin phosphorus and protein nitrogen, and between lipin phosphorus and non-protein nitrogen, have been indicated.

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The Amounts and Distribution of some Phosphorus and Nitrogen Compounds in wheat During Growth.

Knowles¹,

Watkin²

1932

J. Agric. Sci.

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“…Although uranium-based materials were known to be effective catalysts for NH 3 production from N 2 before use of the iron-based catalysts in the current industrial Haber–Bosch process [ 34 ], only a few examples of well-defined uranium species capable of transforming N 2 into NH 3 were known for more than a century and all NH 3 formation processes required protonation with acid [ 35–38 ]. For instance, Mazzanti and co-workers reported a multi-metallic nitride-bridged diuranium(III) complex, [K 3 {[U(OSi(O t Bu) 3 ) 3 ] 2 ( μ -N)}], which can convert N 2 to NH 3 after protonation with acid [ 35 ].…”

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Dinitrogen cleavage and hydrogenation to ammonia with a uranium complex

Xin

Douair

Zhao

et al. 2022

National Science Review

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The Haber–Bosch process produces ammonia (NH3) from dinitrogen (N2) and dihydrogen (H2), but requires high temperature and pressure. Before iron-based catalysts were exploited in the current industrial Haber–Bosch process, uranium-based materials served as effective catalysts for production of NH3 from N2. Although some molecular uranium complexes are known to be capable of combining with N2, further hydrogenation with H2 forming NH3 has not been reported to date. Here, we describe the first example of N2 cleavage and hydrogenation with H2 to NH3 with a molecular uranium complex. The N2 cleavage product contains three uranium centers that are bridged by three imido μ2-NH ligands and one nitrido μ3-N ligand. Labeling experiments with 15N demonstrate that the nitrido ligand in the product originates from N2. Reaction of the N2-cleaved complex with H2 or H+ forms NH3 under mild conditions. A synthetic cycle has been established by the reaction of the N2-cleaved complex with trimethylsilyl chloride (TMSCl). The isolation of this trinuclear imido-nitrido product implies that a multimetallic uranium assembly plays an important role in the activation of N2.

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