Solvent-free synthesis and reactivity of nickel(<scp>ii</scp>) borohydride and nickel(<scp>ii</scp>) hydride

Raje, Sakthi; Angamuthu, Raja

doi:10.1039/c8gc04058c

Cited by 13 publications

(16 citation statements)

References 79 publications

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“…Therefore, it is reasonable to assume that the conjugated ligands would become excellent candidates due to their facile ability to accept electron density from the metal . Remarkably, the metal-hydride intermediates (V or V′, Scheme ) are generally highly sensitive toward oxygen and moisture, rapidly forming the unreactive metal-hydroperoxide and metal-hydroxide species . Until now, the employment of bulky hindered ligands has been proved as an effective way to stabilize the metal-hydride species .…”

Section: Introductionmentioning

confidence: 99%

“Bulky-Yet-Flexible” α-Diimine Palladium-Catalyzed Reductive Heck Cross-Coupling: Highly Anti-Markovnikov-Selective Hydroarylation of Alkene in Air

Yang

Song

et al. 2020

J. Org. Chem.

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To pursue a highly regioselective and efficient reductive Heck reaction, a series of moisture- and air-stable α-diimine palladium precatalysts were rationally designed, readily synthesized, and fully characterized. The relationship between the structures of the palladium complexes and the catalytic properties was investigated. It was revealed that the“bulky-yet-flexible”palladium complexes allowed highly anti-Markovnikov-selective hydroarylation of alkenes with (hetero)aryl bromides under aerobic conditions. Further synthetic application of the present protocol could provide rapid and straightforward access to functional and biologically active molecules.

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Section: Introductionmentioning

confidence: 99%

“Bulky-Yet-Flexible” α-Diimine Palladium-Catalyzed Reductive Heck Cross-Coupling: Highly Anti-Markovnikov-Selective Hydroarylation of Alkene in Air

Yang

Song

et al. 2020

J. Org. Chem.

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“…Three polymorphs of Mg(BH 4 ) 2 are depicted ( 9 : α -, 10 : β -, 11 : γ -), showing increased structural complexity, but also polymeric properties [ 106 , 158 , 171 , 172 , 173 , 189 , 190 , 191 , 192 , 193 , 194 , 195 ]. The α -Mg(BH 4 ) 2 represents the most stable polymorph and its structure determination was a result of combined synchrotron (most information data) and neutron powder diffraction data (orientation of BH 4 tetrahedra).…”

Section: Structural Considerations Of M(bh 4 ) ...mentioning

confidence: 99%

“…α -Mn(BH 4 ) 2 ( 3 in Figure 9 ) crystallizes in the P3 1 12 space group and is isostructural with ζ-Mg(BH 4 ) 2 , having the unit cell parameters a = 10.435(1)Å and c = 10.835(2)Å [ 189 , 190 , 191 , 192 , 193 , 194 , 195 ]. This represents the first crystal structure of a 3d -metal tetrahydroborate.…”

Section: Structural Considerations Of M(bh 4 ) ...mentioning

confidence: 99%

Complex Metal Borohydrides: From Laboratory Oddities to Prime Candidates in Energy Storage Applications

Comănescu

2022

Materials

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Despite being the lightest element in the periodic table, hydrogen poses many risks regarding its production, storage, and transport, but it is also the one element promising pollution-free energy for the planet, energy reliability, and sustainability. Development of such novel materials conveying a hydrogen source face stringent scrutiny from both a scientific and a safety point of view: they are required to have a high hydrogen wt.% storage capacity, must store hydrogen in a safe manner (i.e., by chemically binding it), and should exhibit controlled, and preferably rapid, absorption–desorption kinetics. Even the most advanced composites today face the difficult task of overcoming the harsh re-hydrogenation conditions (elevated temperature, high hydrogen pressure). Traditionally, the most utilized materials have been RMH (reactive metal hydrides) and complex metal borohydrides M(BH4)x (M: main group or transition metal; x: valence of M), often along with metal amides or various additives serving as catalysts (Pd2+, Ti4+ etc.). Through destabilization (kinetic or thermodynamic), M(BH4)x can effectively lower their dehydrogenation enthalpy, providing for a faster reaction occurring at a lower temperature onset. The present review summarizes the recent scientific results on various metal borohydrides, aiming to present the current state-of-the-art on such hydrogen storage materials, while trying to analyze the pros and cons of each material regarding its thermodynamic and kinetic behavior in hydrogenation studies.

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“…To the best of our knowledge, no reports on homoleptic borohydrides of nickel, palladium, and platinum have been published. However, heteroleptic (with chelates type-ligands) Ni-borohydrides are stable and can be used as catalysts [134]. [137].…”

Section: Group 10: Nickel Palladium and Platinummentioning

confidence: 99%

Metal Borohydrides beyond Groups I and II: A Review

Suárez‐Alcántara

García

2021

Materials

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This review consists of a compilation of synthesis methods and several properties of borohydrides beyond Groups I and II, i.e., transition metals, main group, lanthanides, and actinides. The reported properties include crystal structure, decomposition temperature, ionic conductivity, photoluminescence, etc., when available. The compiled properties reflect the rich chemistry and possible borohydrides’ application in areas such as hydrogen storage, electronic devices that require an ionic conductor, catalysis, or photoluminescence. At the end of the review, two short but essential sections are included: a compilation of the decomposition temperature of all reported borohydrides versus the Pauling electronegativity of the cations, and a brief discussion of the possible reactions occurring during diborane emission, including some strategies to reduce this inconvenience, particularly for hydrogen storage purposes.

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Solvent-free synthesis and reactivity of nickel(ii) borohydride and nickel(ii) hydride

Abstract: Transition metal-hydrides are highly useful in organic transformations of industrial importance yet synthesizing them or their precursor metal-borohydrides in high yield is cumbersome due to their high reactivity and sensitivity towards air and many common solvents.

Cited by 13 publications

References 79 publications

“Bulky-Yet-Flexible” α-Diimine Palladium-Catalyzed Reductive Heck Cross-Coupling: Highly Anti-Markovnikov-Selective Hydroarylation of Alkene in Air

“Bulky-Yet-Flexible” α-Diimine Palladium-Catalyzed Reductive Heck Cross-Coupling: Highly Anti-Markovnikov-Selective Hydroarylation of Alkene in Air

Complex Metal Borohydrides: From Laboratory Oddities to Prime Candidates in Energy Storage Applications

Metal Borohydrides beyond Groups I and II: A Review

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