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Affiliation(s)
- Ross F. Koby
- Department of Chemistry Vanderbilt University Nashville TN 37235 USA
| | - Nathan D. Schley
- Department of Chemistry Vanderbilt University Nashville TN 37235 USA
| | - Timothy P. Hanusa
- Department of Chemistry Vanderbilt University Nashville TN 37235 USA
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Koby RF, Schley ND, Hanusa TP. Di(indenyl)beryllium. Angew Chem Int Ed Engl 2021; 60:21174-21178. [PMID: 34227203 DOI: 10.1002/anie.202107980] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Indexed: 12/16/2022]
Abstract
The bonding in beryllocene, [BeCp2 ], took decades to establish, owing to its unexpected mixed hapticity structure (i.e., [Be(η5 -Cp)(η1 -Cp)]). Beryllium complexes containing the indenyl ligand, which is a close relative of the cyclopentadienyl anion, but which is also known to exhibit its own bonding peculiarities (e.g., facile η5 ⇄ η3 shifts), have remained unknown. Standard metathetical approaches to their synthesis (e.g., with K[Ind'] + BeX2 in an ether solvent) give rise to intractable oils from which nothing identifiable can be isolated. In contrast, mechanochemical preparation, involving the solvent-free grinding of BeBr2 and potassium indenides, leads to the production of discrete (indenyl)beryllium complexes, including [Be(C9 H7 )2 ] (1) and [Be{1,3-(SiMe3 )2 C9 H5 }Br] (2). The former displays η5 /η1 -coordinated ligands in the solid state, but DFT calculations indicate that an η5 /η5 -conformation is less than 5 kcal mol-1 higher in energy.
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Affiliation(s)
- Ross F Koby
- Department of Chemistry, Vanderbilt University, Nashville, TN, 37235, USA
| | - Nathan D Schley
- Department of Chemistry, Vanderbilt University, Nashville, TN, 37235, USA
| | - Timothy P Hanusa
- Department of Chemistry, Vanderbilt University, Nashville, TN, 37235, USA
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3
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Grabowski SJ. The coordination of beryllium and magnesium centres in half-sandwich and sandwich compounds. J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2021.121906] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Saha R, Pan S, Chattaraj PK. NgMCp+: Noble Gas Bound Half-Sandwich Complexes (Ng = He–Rn, M = Be–Ba, and Cp = η5-C5H5). J Phys Chem A 2017; 121:3526-3539. [DOI: 10.1021/acs.jpca.7b00389] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ranajit Saha
- Department of Chemistry and
Centre for Theoretical Studies, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Sudip Pan
- Department of Chemistry and
Centre for Theoretical Studies, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Pratim K. Chattaraj
- Department of Chemistry and
Centre for Theoretical Studies, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
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Bayram M, Naglav D, Wölper C, Schulz S. Synthesis and Structure of Bis(diphenylphosphinimino)methanide and Bis(diphenylphosphinimino)methanediide Beryllium Complexes. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00380] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Melike Bayram
- Institute
of Inorganic Chemistry, University of Duisburg-Essen, 45117 Essen, Germany
| | - Dominik Naglav
- Institute
of Inorganic Chemistry, University of Duisburg-Essen, 45117 Essen, Germany
| | - Christoph Wölper
- Institute
of Inorganic Chemistry, University of Duisburg-Essen, 45117 Essen, Germany
| | - Stephan Schulz
- Institute
of Inorganic Chemistry, University of Duisburg-Essen, 45117 Essen, Germany
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Himmel D, Scherer H, Kratzert D, Krossing I. Synthesis and Characterization of Cp*Be-F-Al(ORF)3. Z Anorg Allg Chem 2015. [DOI: 10.1002/zaac.201400476] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Chmely S, Hanusa T, Brennessel W. Bis(1,3-trimethylsilylallyl)beryllium. Angew Chem Int Ed Engl 2010; 49:5870-4. [DOI: 10.1002/anie.201001866] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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8
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9
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Cyclopentadienyltin(IV) derivatives: Synthesis, characterization and study of their cytotoxic activities. Polyhedron 2010. [DOI: 10.1016/j.poly.2009.05.056] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ariafard A, Tabatabaie ES, Yates BF. Mechanistic studies of ligand fluxionality in [M(eta(5)-Cp)(eta(1)-Cp)(L)2]n. J Phys Chem A 2009; 113:2982-9. [PMID: 19260667 DOI: 10.1021/jp810032a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Density functional theory has been used to provide a thorough investigation of the mechanistic factors affecting Cp ligand fluxionality in a series of organometallic complexes, [M(eta(5)-Cp)(eta(1)-Cp)(L)(2)](n), involving different metals, different oxidation states, and different ligands. Excellent agreement with experiment for the barrier heights for the 1,5-shift were obtained for the complexes [Fe(eta(5)-Cp*)(eta(1)-Cp)(CO)(2)] and [Fe(eta(5)-Cp)(eta(1)-Cp)(CO)(2)]. For the range of complexes studied, the barriers have been successfully rationalized in terms of hyperconjugation, metal-Cp bond strength, and steric effects. In addition, the eta(1)-eta(5) interconversion of the Cp binding mode is shown to be a high-energy process, consistent with experimental observations. The L substitution reactions by eta(1)-Cp are quite sensitive to the nature of the metal center and ancillary ligand. A detailed theoretical explanation of the factors involved in all of these transformations is provided.
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Affiliation(s)
- Alireza Ariafard
- Department of Chemistry, Faculty of Science, Central Tehran Branch, Islamic Azad University, Shahrak Gharb, Tehran, Iran.
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Macdonald CLB, Gorden JD, Voigt A, Filipponi S, Cowley AH. Group 13 decamethylmetallocenium cations. Dalton Trans 2008:1161-76. [DOI: 10.1039/b716220k] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Liu R, Zhou X. Reactivity of the metal–cyclopentadienyl (indenyl, fluorenyl and cycloheptatrienyl) bonds. J Organomet Chem 2007. [DOI: 10.1016/j.jorganchem.2007.05.033] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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13
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Gómez-Ruiz S, Prashar S, Fajardo M, Antiñolo A, Otero A. Synthesis, structural characterization and reactivity of new tin bridged ansa-bis(cyclopentadiene) compounds: X-ray crystal structures of Me2Sn(C5Me4R-1)2 (R=H, SiMe3). J Organomet Chem 2007. [DOI: 10.1016/j.jorganchem.2007.03.031] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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14
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Affiliation(s)
- Rafael Fernández
- Instituto de Investigaciones Químicas, Departamento de Química Inorgánica, Consejo Superior de Investigaciones Científicas, Universidad de Sevilla Avenida de Américo Vespucio, s/n, 41092 Sevilla, Spain, Fax: +34‐95‐446‐0565
| | - Ernesto Carmona
- Instituto de Investigaciones Químicas, Departamento de Química Inorgánica, Consejo Superior de Investigaciones Científicas, Universidad de Sevilla Avenida de Américo Vespucio, s/n, 41092 Sevilla, Spain, Fax: +34‐95‐446‐0565
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Hung I, Macdonald CLB, Schurko RW. Structure and Dynamics of Homoleptic Beryllocenes: A Solid-State9Be and13C NMR Study. Chemistry 2004; 10:5923-35. [PMID: 15484199 DOI: 10.1002/chem.200400404] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The correlation between anisotropic 9Be NMR (quadrupolar and chemical shielding) interactions and the structure and dynamics in [Cp2Be], [Cp2*Be], and [(C5Me4H)2Be] is examined by solid-state 9Be NMR spectroscopy, as well as by ab initio and hybrid density functional theory calculations. The 9Be quadrupole coupling constants in the three compounds correspond well to the relative degrees of spherical ground-state electronic symmetry of the environment about beryllium. Theoretical computations of NMR interaction tensors are in excellent agreement with experimental values and aid in understanding the origins of NMR interaction tensors and their correlation to molecular symmetry. Variable-temperature (VT) 9Be and 13C NMR experiments reveal a highly fluxional structure in the condensed phase of [Cp2Be]. In particular, the pathway by which the Cp rings of [Cp2Be] 'invert' coordination modes is examined in detail using hybrid density functional theory in order to inspect variations of the 9Be NMR interaction tensors. The activation energy for the 'inversion' process is found to be 36.9 kJ mol(-1) from chemical exchange analysis of 13C VT CP/MAS NMR spectra. The low-temperature (ca. -100 degrees C) X-ray crystal structures of all three compounds have been collected and refined, and are in agreement with previously reported structures. In addition, the structure of the same Cp2Be crystal was determined at 20 degrees C and displays features consistent with increased intramolecular motion, supporting observations by 9Be VT NMR spectroscopy.
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Affiliation(s)
- Ivan Hung
- Department of Chemistry and Biochemistry, University of Windsor, 393-A Essex Hall, Windsor, ON, N9B 3P4, Canada
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