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Greño M, Pérez-Redondo A, Torrijos J, Varela-Izquierdo V, Yélamos C. Half-Sandwich Zirconium and Hafnium Amidoborane Complexes: Precursors of Hydride Derivatives. Inorg Chem 2024; 63:6576-6588. [PMID: 38567753 PMCID: PMC11022180 DOI: 10.1021/acs.inorgchem.3c02826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 03/08/2024] [Accepted: 03/13/2024] [Indexed: 04/16/2024]
Abstract
Half-sandwich zirconium(IV) and hafnium(IV) complexes with amidoborane and hydride ligands have been isolated in the stoichiometric reactions of mono(pentamethylcyclopentadienyl)metal alkyl and amido derivatives with the amine-boranes NHR2BH3 (R2 = H2, Me2, HtBu). Treatment of the tris(trimethylsilylmethyl) complexes [M(η5-C5Me5)(CH2SiMe3)3] with NH3BH3 (3 equiv) gives the seven-coordinate species [M(η5-C5Me5)(NH2BH3)3] (M = Zr (1), Hf (2)) with three κ2N,H-NH2BH3 ligands. The tris(neophyl) [M(η5-C5Me5)(CH2CMe2Ph)3] or tris(dimethylamido) [M(η5-C5Me5)(NMe2)3] derivatives react with NHMe2BH3 (≥3 equiv) to afford bis(dimethylamidoborane) hydride complexes [M(η5-C5Me5)H(NMe2BH3)2] (M = Zr (3), Hf (4)) via thermally unstable [M(η5-C5Me5)(NMe2BH3)3] species. The reaction of [M(η5-C5Me5)(NMe2)3] and NH2tBuBH3 (≥4 equiv) affords analogous mixed amidoborane hydride derivatives [M(η5-C5Me5)H(NHtBuBH3)(NMe2BH3)] (M = Zr (5), Hf (6)) with κ2N,H-NHtBuBH3 and κ3N,H,H-NMe2BH3 ligands. The addition of NHR2BH3 (≥1 equiv) on the mono(dimethylamido) complexes [M(η5-C5Me5)Cl2(NMe2)] in hexane leads to the precipitation of the ionic compounds [(NHR2)2BH2][{M(η5-C5Me5)Cl2}2(μ-H)3] (R2 = Me2, M = Zr (7), Hf (8); R2 = HtBu, M = Zr (9), Hf (10)). Molecular hydride species [Cl2(η5-C5Me5)M(μ-Cl)(μ-H)2M(η5-C5Me5)Cl(NH2tBu)] (M = Zr (11), Hf (12)) could be isolated from mixtures of complexes [M(η5-C5Me5)Cl2(NMe2)] and lower ratios of NH2tBuBH3. The zirconium complex 11 decomposes in solution to give the mononuclear tert-butylamido derivative [Zr(η5-C5Me5)Cl2(NHtBu)] (13) along with other byproducts.
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Affiliation(s)
- Maider Greño
- Departamento de Química
Orgánica y Química Inorgánica, Instituto de Investigación
Química “Andrés M. del Río” (IQAR), Universidad de Alcalá, 28805 Alcalá de Henares, Madrid, Spain
| | - Adrián Pérez-Redondo
- Departamento de Química
Orgánica y Química Inorgánica, Instituto de Investigación
Química “Andrés M. del Río” (IQAR), Universidad de Alcalá, 28805 Alcalá de Henares, Madrid, Spain
| | - José Torrijos
- Departamento de Química
Orgánica y Química Inorgánica, Instituto de Investigación
Química “Andrés M. del Río” (IQAR), Universidad de Alcalá, 28805 Alcalá de Henares, Madrid, Spain
| | - Víctor Varela-Izquierdo
- Departamento de Química
Orgánica y Química Inorgánica, Instituto de Investigación
Química “Andrés M. del Río” (IQAR), Universidad de Alcalá, 28805 Alcalá de Henares, Madrid, Spain
| | - Carlos Yélamos
- Departamento de Química
Orgánica y Química Inorgánica, Instituto de Investigación
Química “Andrés M. del Río” (IQAR), Universidad de Alcalá, 28805 Alcalá de Henares, Madrid, Spain
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Del Horno E, Jover J, Mena M, Pérez-Redondo A, Yélamos C. Dinitrogen Binding at a Trititanium Chloride Complex and Its Conversion to Ammonia under Ambient Conditions. Angew Chem Int Ed Engl 2022; 61:e202204544. [PMID: 35748604 PMCID: PMC9542190 DOI: 10.1002/anie.202204544] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Indexed: 12/18/2022]
Abstract
Reaction of [TiCp*Cl3] (Cp*=η5‐C5Me5) with one equivalent of magnesium in tetrahydrofuran at room temperature affords the paramagnetic trinuclear complex [{TiCp*(μ‐Cl)}3(μ3‐Cl)], which reacts with dinitrogen under ambient conditions to give the diamagnetic derivative [{TiCp*(μ‐Cl)}3(μ3‐η1 : η2 : η2‐N2)] and the titanium(III) dimer [{TiCp*Cl(μ‐Cl)}2]. The structure of the trinuclear mixed‐valence complexes has been studied by experimental and theoretical methods and the latter compound represents the first well‐defined example of the μ3‐η1 : η2 : η2 coordination mode of the dinitrogen molecule. The reaction of [{TiCp*(μ‐Cl)}3(μ3‐η1 : η2 : η2‐N2)] with excess HCl in tetrahydrofuran results in clean NH4Cl formation with regeneration of the starting material [TiCp*Cl3]. Therefore, a cyclic ammonia synthesis under ambient conditions can be envisioned by alternating N2/HCl atmospheres in a [TiCp*Cl3]/Mg(excess) reaction mixture in tetrahydrofuran.
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Affiliation(s)
- Estefanía Del Horno
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR), Universidad de Alcalá, 28805, Alcalá de Henares-Madrid, Spain
| | - Jesús Jover
- Secció de Química Inorgànica, Departament de Química Inorgànica i Orgànica, Institut de Química Teòrica i Computacional (IQTC-UB), Universitat de Barcelona, Martí i Franquès 1-11, 08028, Barcelona, Spain
| | - Miguel Mena
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR), Universidad de Alcalá, 28805, Alcalá de Henares-Madrid, Spain
| | - Adrián Pérez-Redondo
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR), Universidad de Alcalá, 28805, Alcalá de Henares-Madrid, Spain
| | - Carlos Yélamos
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR), Universidad de Alcalá, 28805, Alcalá de Henares-Madrid, Spain
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Yelamos C, del Horno E, Jover J, Mena M, Perez-Redondo A. Dinitrogen Binding at a Trititanium Chloride Complex and Its Conversion to Ammonia under Ambient Conditions. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202204544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Carlos Yelamos
- Universidad de Alcala Quimica Organica y Quimica Inorganica Campus Universitario, Edificio Farmacia 28805 Alcala de Henares SPAIN
| | - Estefania del Horno
- Universidad de Alcala Departamento de Quimica Organica y Quimica Inorganica Edificio de Farmacia, Campus Universitario 28805 Alcalá de Henares, Madrid SPAIN
| | - Jesus Jover
- Universitat de Barcelona Facultat de Quimica Deapartment de Quimica Inorganica i Organica Marti i Franques 1-11 08028 Barcelona SPAIN
| | - Miguel Mena
- Universidad de Alcala Departamento de Quimica Organica y Quimica Inorganica Edificio de Farmacia, Campus Universitario 28805 Alcalá de Henares, Madrid SPAIN
| | - Adrian Perez-Redondo
- Universidad de Alcala Departamento de Quimica Organica y Quimica Inorganica Edificio de Farmacia, Campus Universitario 28805 Alcalá de Henares, Madrid SPAIN
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Del Horno E, Jover J, Mena M, Pérez-Redondo A, Yélamos C. Low-Valent Titanium Species Stabilized with Aluminum/Boron Hydride Fragments. Chemistry 2021; 28:e202103085. [PMID: 34735025 DOI: 10.1002/chem.202103085] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Indexed: 11/09/2022]
Abstract
Low-valent titanium species were prepared by reaction of [TiCp*X3 ] (Cp*=η5 -C5 Me5 ; X=Cl, Br, Me) with LiEH4 (E=Al, B) or BH3 (thf), and their structures elucidated by experimental and theoretical methods. The treatment of trihalides [TiCp*X3 ] with LiAlH4 in ethereal solvents (L) leads to the hydride-bridged heterometallic complexes [{TiCp*(μ-H)}2 {(μ-H)2 AlX(L)}2 ] (L=thf, X=Cl, Br; L=OEt2 , X=Cl). Density functional theory (DFT) calculations for those compounds reveal an open-shell singlet ground state with a Ti-Ti bond and can be described as titanium(II) species. The theoretical analyses also show strong interactions between the Ti-Ti bond and the empty s orbitals of the Al atom of the AlH2 XL fragments, which behave as σ-accepting (Z-type) ligands. Analogous reactions of [TiCp*X3 ] with LiBH4 (2 and 3 equiv.) in tetrahydrofuran at room temperature and at 85 °C lead to the titanium(III) compounds [{TiCp*(BH4 )(μ-X)}2 ] (X=Cl, Br) and [{TiCp*(BH4 )(μ-BH4 )}2 ], respectively. The treatment of [TiCp*Me3 ] with 4 and 5 equiv. of BH3 (thf) produces the diamagnetic [{TiCp*(BH3 Me)}2 (μ-B2 H6 )] and paramagnetic [{TiCp*(μ-B2 H6 )}2 ] complexes, respectively.
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Affiliation(s)
- Estefanía Del Horno
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR), Universidad de Alcalá, 28805 Alcalá de, Henares-Madrid, Spain
| | - Jesús Jover
- Secció de Química Inorgànica, Departament de Química Inorgànica i Orgànica, Institut de Química Teòrica i Computacional (IQTC-UB), Universitat de Barcelona, Martí i Franquès 1-11, 08028, Barcelona, Spain
| | - Miguel Mena
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR), Universidad de Alcalá, 28805 Alcalá de, Henares-Madrid, Spain
| | - Adrián Pérez-Redondo
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR), Universidad de Alcalá, 28805 Alcalá de, Henares-Madrid, Spain
| | - Carlos Yélamos
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR), Universidad de Alcalá, 28805 Alcalá de, Henares-Madrid, Spain
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Mena M, Pérez-Redondo A, Varela-Izquierdo V, Yélamos C. X-Ray Crystal Structures of Two Monopentamethylcyclopentadienylhafnium(IV) Complexes. CRYSTALLOGR REP+ 2021. [DOI: 10.1134/s1063774521030184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Del Horno E, Jover J, Mena M, Pérez-Redondo A, Yélamos C. Ammonia-Borane Derived BN Fragments Trapped on Bi- and Trimetallic Titanium(III) Systems. Chemistry 2019; 25:7096-7100. [PMID: 30866106 DOI: 10.1002/chem.201900083] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Indexed: 11/06/2022]
Abstract
Titanium(III) complexes containing unprecedented (NH2 BH2 NHBH3 )2- and {N(BH3 )3 }3- ligands have been isolated, and their structures elucidated by a combination of experimental and theoretical methods. The treatment of the trimethyl derivative [TiCp*Me3 ] (Cp*=η5 -C5 Me5 ) with NH3 BH3 (3 equiv) at room temperature gives the paramagnetic dinuclear complex [{TiCp*(NH2 BH3 )}2 (μ-NH2 BH2 NHBH3 )], which at 80 °C leads to the trinuclear hydride derivative [{TiCp*(μ-H)}3 {μ3 -N(BH3 )3 }]. The bonding modes of the anionic BN fragments in those complexes, as well as the dimethylaminoborane group trapped on the analogous trinuclear [{TiCp*(μ-H)}3 (μ3 -H)(μ3 -NMe2 BH2 )], have been studied by X-ray crystallography and density functional theory (DFT) calculations.
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Affiliation(s)
- Estefanía Del Horno
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR), Universidad de Alcalá, 28805, Alcalá, de Henares-Madrid, Spain
| | - Jesús Jover
- Department de Química Inorgànica i Orgànica, Institut de Química Teòrica i Computacional (IQTC-UB), Universitat de Barcelona, Martí i Franquès 1-11, 08028, Barcelona, Spain
| | - Miguel Mena
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR), Universidad de Alcalá, 28805, Alcalá, de Henares-Madrid, Spain
| | - Adrián Pérez-Redondo
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR), Universidad de Alcalá, 28805, Alcalá, de Henares-Madrid, Spain
| | - Carlos Yélamos
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR), Universidad de Alcalá, 28805, Alcalá, de Henares-Madrid, Spain
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Fischer M, Barbul D, Schmidtmann M, Beckhaus R. Unexpected Selective Methyl Group Abstractions from SiMe
3
Moieties of CH
2
SiMe
3
Ligands To Give New Cationic Titanium Complexes. Chemistry 2019; 25:7119-7130. [DOI: 10.1002/chem.201900599] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Indexed: 11/08/2022]
Affiliation(s)
- Malte Fischer
- Institut für ChemieFakultät für Mathematik und NaturwissenschaftenCarl von Ossietzky Universität Oldenburg Postfach 2503 26111 Oldenburg Germany
| | - Daniel Barbul
- Institut für ChemieFakultät für Mathematik und NaturwissenschaftenCarl von Ossietzky Universität Oldenburg Postfach 2503 26111 Oldenburg Germany
| | - Marc Schmidtmann
- Institut für ChemieFakultät für Mathematik und NaturwissenschaftenCarl von Ossietzky Universität Oldenburg Postfach 2503 26111 Oldenburg Germany
| | - Ruediger Beckhaus
- Institut für ChemieFakultät für Mathematik und NaturwissenschaftenCarl von Ossietzky Universität Oldenburg Postfach 2503 26111 Oldenburg Germany
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