Rights statement: This is the author’s version of a work that was accepted for publication in Polyhedron. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Polyhedron, 178, 2020 DOI: 10.1016/j.poly.2020.114355
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Formation of Mn hydrides from bis(trimethylsilylmethyl) Mn(II)
T2 - A DFT study
AU - Hales, J.J.
AU - Trudeau, M.L.
AU - Antonelli, D.M.
AU - Kaltsoyannis, N.
N1 - This is the author’s version of a work that was accepted for publication in Polyhedron. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Polyhedron, 178, 2020 DOI: 10.1016/j.poly.2020.114355
PY - 2020/3/1
Y1 - 2020/3/1
N2 - We recently reported the synthesis and characterization of KMH-1 (Kubas Manganese Hydride – 1 [L. Morris et al., Energy Environ. Sci., 2019, 12, 1580–1591]), a manganese hydride molecular sieve which, if incorporated into a hydrogen storage system, projects sufficient performance to realise the DOE system targets for H2 storage and delivery. KMH-1 is amorphous and paramagnetic, making its characterization challenging, and how it is formed from its simple Mn(II) organometallic precursors is not fully understood. In this contribution, we explore computationally several series of reactions that could occur in the production of KMH 1 from bis(trimethylsilylmethyl) manganese (II) (Mn(TMSM)2), including the formation of hydrides, ways to generate the extended structure and reactions to produce species with Mn(I) centres (KMH-1 is believed to contain a substantial proportion of Mn(I)). We show that the most likely route to the formation of Mn hydrides is via elimination of tetramethylsilane (TMS) by reaction of Mn(TMSM)2 with H2. These hydrides could then react to grow the extended KMH-1 structure via Mn hydride condensation reactions. Alternatively, multimetallic TMS-containing products could be formed via condensation reactions involving Mn(TMSM)2 and/or MnTMSM, after which the TMS ligand could be removed via elimination reactions with H2. The formation of Mn(I) centres from Mn(II) hydrides is most likely via H2 elimination from Mn(II) hydrides.
AB - We recently reported the synthesis and characterization of KMH-1 (Kubas Manganese Hydride – 1 [L. Morris et al., Energy Environ. Sci., 2019, 12, 1580–1591]), a manganese hydride molecular sieve which, if incorporated into a hydrogen storage system, projects sufficient performance to realise the DOE system targets for H2 storage and delivery. KMH-1 is amorphous and paramagnetic, making its characterization challenging, and how it is formed from its simple Mn(II) organometallic precursors is not fully understood. In this contribution, we explore computationally several series of reactions that could occur in the production of KMH 1 from bis(trimethylsilylmethyl) manganese (II) (Mn(TMSM)2), including the formation of hydrides, ways to generate the extended structure and reactions to produce species with Mn(I) centres (KMH-1 is believed to contain a substantial proportion of Mn(I)). We show that the most likely route to the formation of Mn hydrides is via elimination of tetramethylsilane (TMS) by reaction of Mn(TMSM)2 with H2. These hydrides could then react to grow the extended KMH-1 structure via Mn hydride condensation reactions. Alternatively, multimetallic TMS-containing products could be formed via condensation reactions involving Mn(TMSM)2 and/or MnTMSM, after which the TMS ligand could be removed via elimination reactions with H2. The formation of Mn(I) centres from Mn(II) hydrides is most likely via H2 elimination from Mn(II) hydrides.
KW - Hydrogen storage
KW - DFT
KW - Manganese (II)
KW - Hydrides
KW - Reactions
U2 - 10.1016/j.poly.2020.114355
DO - 10.1016/j.poly.2020.114355
M3 - Journal article
VL - 178
JO - Polyhedron
JF - Polyhedron
SN - 0277-5387
M1 - 114355
ER -