Development of Catalytic Conversion of Nitrogen Molecule into Ammonia Using Molybdenum Complexes under Ambient Reaction Conditions

2021 ◽  
Author(s):  
Yuya Ashida ◽  
Yoshiaki Nishibayashi
Keyword(s):  
Nitrogen Fixation ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Catalytic Conversion ◽  
Nitrogen Molecule ◽  
Reaction Conditions ◽  
Molybdenum Complexes

Nitrogen fixation using homogeneous transition metal complexes under mild reaction conditions is a challenging topic in the field of chemistry. Several successful examples of the catalytic conversion of nitrogen molecule...

Transition metal complexes of substituted alkynes. XI. The reactions of But-2-yne and Hexafluorobut-2-yne with Dicarbonyl(η-cyclopentadieny)-cobalt and -rhodium

1974 ◽  
Vol 27 (1) ◽  
pp. 61 ◽  
Author(s):  
RS Dickson ◽  
HP Kirsch
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Major Product ◽  
Reaction Conditions ◽  
A Minor ◽  
Related Reaction

The thermally initiated reaction of hexafluorobut-2-yne and (q-C5H5)C~(C0)2 gives the 1-4-q- hexakis(trifiuoromethy1)benzene complex (7-C5H5)Co [(CF3C2CF3)3] in addition to the known cyclopentadienone complex (q-C5H5)Co [(CF3C2CF3)2CO]. The related reaction of but-2-yne with (q-CjH j)Co(CO)2 gives several compounds in addition to the cyclopentadienone complex (q-C jHj)C~- [(MeC2Me)2CO] which has been isolated previously from this reaction. Thus, the duroquinone complex (q-C5H5)Co [(MeC2Me)2(C0)2], the maleoyl complex (q-C5H5)Co(MeC2Me)(C0)3, and free duroquinone have been obtained. The yields of the various products are influenced by the reaction conditions. The metallocyclopentadiene complex (q-C jH j)2Rh2(CF3C2CF3)2, which is formed in the reaction between (q-C,H,)Rh(CO), and hexafluorobut-2-yne, exhibits fluxional behaviour in solution at c. 130". Two complexes are formed in the reaction at 100-120' between (q-C5Hj)Rh- (CO)2 and but-2-yne. These are the cyclopentadienone complex (q-C5H5)Rh [(MeC2Me)2CO] and the duroquinone complex (7-CjH5)Rh [(MeC2Me)2(C0)2]. Comparison of the various reactions indicates that: (i) a cyclopentadienone complex (q-CgH5)M- [(MeC2Me)2CO] is generally formed as major product and a duroquinone complex (q-C5Hj)M- [(MeC2Me)2(C0)2] is generally formed as a minor product in reactions between (q-C5H5)M(C0)2, M = Co and Rh, and but-2-yne; and (ii) a tetrahaptobenzene complex (q-C5H5)M [(CF3C2CF3)3] is formed as major product when M = Rh and as a minor product when M = Co in reactions between (q-C5H5)M(CO)2 and hexafluorobut-2-yne.

Gas-Phase Hydrogenation with Parahydrogen Over Immobilized Vaska’s Complex

2017 ◽  
Vol 231 (3) ◽  
Author(s):  
Ivan V. Skovpin ◽  
Vladimir V. Zhivonitko ◽  
Igor P. Prosvirin ◽  
Dzhalil F. Khabibulin ◽  
Igor V. Koptyug
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Gas Phase ◽  
Transition Metal Complexes ◽  
Iridium Complex ◽  
Nuclear Spins ◽  
Reaction Conditions ◽  
Major Drawback ◽  
Hydrogenation Catalysts ◽  
Immobilized Complexes

AbstractGenerating parahydrogen-induced polarization (PHIP) of nuclear spins with immobilized transition metal complexes as hydrogenation catalysts allows one to produce pure hyperpolarized substances, which can open new revolutionary perspectives for PHIP applications. A major drawback of immobilized complexes is their low stability under reaction conditions. In the present work we studied an immobilized iridium complex, Ir/SiO

Nitrogen Fixation by Transition Metal Complexes

Nature ◽  
1966 ◽  
Vol 209 (5029) ◽  
pp. 1236-1236 ◽  
Author(s):  
M. E. VOL'PIN ◽  
V. B. SHUR
Keyword(s):  
Nitrogen Fixation ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes

Structural analysis of the coordination of dinitrogen to transition metal complexes

2015 ◽  
Vol 71 (3) ◽  
pp. 369-386 ◽  
Author(s):  
Benjamin Peigné ◽  
Gabriel Aullón
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Electronic Configuration ◽  
Nitrogen Molecule ◽  
Geometrical Parameters ◽  
Binuclear Complexes ◽  
Mononuclear Complexes ◽  
Structural Database ◽  
Metal Properties

Transition-metal complexes show a wide variety of coordination modes for the nitrogen molecule. A structural database study has been undertaken for dinitrogen complexes, and geometrical parameters around theLnM—N2unit are retrieved from the Cambridge Structural Database. These data were classified in families of compounds, according to metal properties, to determine the degree of lengthening for the dinitrogen bonding. The importance of the nature of the metal center, such as coordination number and electronic configuration, is reported. Our study reveals poor activation by coordination of dinitrogen in mononuclear complexes, always havingend-oncoordination. However, partial weakening of nitrogen–nitrogen bonding is found forend-onbinuclear complexes, whereasside-oncomplexes can be completely activated.

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