1
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Luder DJ, Terefenko N, Sun Q, Eckert H, Mück-Lichtenfeld C, Kehr G, Erker G, Wiegand T. Polar covalent apex-base bonding in borapyramidanes probed by solid-state NMR and DFT calculations. Chemistry 2024; 30:e202303701. [PMID: 38078510 DOI: 10.1002/chem.202303701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Indexed: 01/04/2024]
Abstract
Pyramidane molecules have attracted chemists for many decades due to their regular shape, high symmetry and their correspondence in the macroscopic world. Recently, experimental access to a number of examples has been reported, in particular the rarely reported square pyramidal bora[4]pyramidanes. To describe the bonding situation of the nonclassical structure of pyramidanes, we present solid-state Nuclear Magnetic Resonance (NMR) as a versatile tool for deciphering such bonding properties for three now accessible bora[4]pyramidane and dibora[5]pyramidane molecules. 11 B solid-state NMR spectra indicate that the apical boron nuclei in these compounds are strongly shielded (around -50 ppm vs. BF3 -Et2 O complex) and possess quadrupolar coupling constants of less than 0.9 MHz pointing to a rather high local symmetry. 13 C-11 B spin-spin coupling constants have been explored as a measure of the bond covalency in the borapyramidanes. While the carbon-boron bond to the -B(C6 F5 )2 substituents of the base serves as an example for a classical covalent 2-center-2-electron (2c-2e) sp2 -carbon-sp2 -boron σ-bond with 1 J(13 C-11 B) coupling constants in the order of 75 Hz, those of the boron(apical)-carbon(basal) bonds in the pyramid are too small to measure. These results suggest that these bonds have a strongly ionic character, which is also supported by quantum-chemical calculations.
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Affiliation(s)
- Dominique J Luder
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52074, Aachen, Germany
- Laboratory of Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093, Zürich, Switzerland
| | - Nicole Terefenko
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52074, Aachen, Germany
| | - Qiu Sun
- Organische Chemie, University of Münster, Corrensstr. 36, 48149, Münster, Germany
| | - Hellmut Eckert
- Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP 13566-590, Brazil
- Institut für Physikalische Chemie, University of Münster, Corrensstr. 30, 48149, Münster, Germany
| | | | - Gerald Kehr
- Organische Chemie, University of Münster, Corrensstr. 36, 48149, Münster, Germany
| | - Gerhard Erker
- Organische Chemie, University of Münster, Corrensstr. 36, 48149, Münster, Germany
| | - Thomas Wiegand
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52074, Aachen, Germany
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470, Mülheim, Germany
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2
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Nandi C, Bag R, Giri S, Roy A, Cordier M, Ghosh S. Triple-decker complexes comprising heterocyclic middle-deck with coinage metals. J Organomet Chem 2023. [DOI: 10.1016/j.jorganchem.2023.122667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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3
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Shigenobu K, Philippi F, Tsuzuki S, Kokubo H, Dokko K, Watanabe M, Ueno K. On the concentration polarisation in molten Li salts and borate-based Li ionic liquids. Phys Chem Chem Phys 2023; 25:6970-6978. [PMID: 36804678 DOI: 10.1039/d2cp05710g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Electrolytes that transport only Li ions play a crucial role in improving rapid charge and discharge properties in Li secondary batteries. Single Li-ion conduction can be achieved via liquid materials such as Li ionic liquids containing Li+ as the only cations because solvent-free fused Li salts do not polarise in electrochemical cells, owing to the absence of neutral solvents that allow polarisation in the salt concentration and the inevitably homogeneous density in the cells under anion-blocking conditions. However, we found that borate-based Li ionic liquids induce concentration polarisation in a Li/Li symmetric cell, which results in their transference (transport) numbers under anion-blocking conditions (tabcLi) being well below unity. The electrochemical polarisation of the borate-based Li ionic liquids was attributed to an equilibrium shift caused by exchangeable B-O coordination bonds in the anions to generate Li salts and borate-ester solvents at the electrode/electrolyte interface. By comparing borate-based Li ionic liquids containing different ligands, the B-O bond strength and extent of ligand exchange were found to be directly linked to the tabcLi values. This study confirms that the presence of dynamic exchangeable bonds causes electrochemical polarisation and provides a reference for the rational molecular design of Li ionic liquids aimed at achieving single-ion conducting liquid electrolytes.
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Affiliation(s)
- Keisuke Shigenobu
- Department of Chemistry and Life Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
| | - Frederik Philippi
- Department of Chemistry and Life Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
| | - Seiji Tsuzuki
- Institute of Advanced Sciences, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Hisashi Kokubo
- Department of Chemistry and Life Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
| | - Kaoru Dokko
- Department of Chemistry and Life Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan. .,Institute of Advanced Sciences, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Masayoshi Watanabe
- Institute of Advanced Sciences, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Kazuhide Ueno
- Department of Chemistry and Life Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan. .,Institute of Advanced Sciences, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
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4
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Pathak K, Mishra S, Nandi C, Saha S, Ghosh S. Synthesis and Chemistry of Dihydridoborate Group 7 Metal Complexes with Varied N,E-Chelated Ligands (E = O, NH, or S). Inorg Chem 2023; 62:160-169. [PMID: 36574500 DOI: 10.1021/acs.inorgchem.2c03095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Several dihydridoborate group 7 metal complexes have been synthesized and their structural aspects have been described from various N,S-, N,N-, and N,O-chelated borate species, such as Na[(H3B)mp] (mp = 2-mercaptopyridyl), Na[(H3B)amt] (amt = 2-amino-5-mercapto-1,3,4-thiadiazolyl), Na[(H3B)hp] (hp = 2-hydroxypyridyl), Na[(H2B)bap] (bap = bis(2-aminopyridyl)), and Na[(H2B)bdap] (bdap = bis(2,6-diaminopyridyl)). Room temperature photolysis of [M2(CO)10] (M = Mn or Re) with these borate species afforded dihydridoborate complexes [(CO)3M(μ-H)2BHL] 1-6 (1, M = Mn, L = mp; 2, M = Re, L = mp; 3, M = Mn, L = amt; 4, M = Mn, L = hp; 5, M = Mn, L = ap; 6, M = Mn, L = dap, ap = 2-aminopyridyl, dap = 2,6-diaminopyridyl). In complexes 1-3, the corresponding (H2BHL) units are coordinated to the metal centers through the (κ3-H,H,S) mode. However, in complexes 4 and 5 (or 6), the connection is via (κ3-H,H,O) and (κ3-H,H,N) modes of coordination, respectively. Complexes 1 and 5 underwent hydroboration reactions with terminal alkynes that yielded trans-hydroborated species [Mn(CO)3(μ-H)2(NC5H4E)B(PhC═CH2)] (7, E = S; 8, E = NH). Density functional theory (DFT) calculations have been carried out to investigate the electronic structures of these dihydridoborate species as well as the nature of bonding in them.
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Affiliation(s)
- Kriti Pathak
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Shivankan Mishra
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Chandan Nandi
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Suvam Saha
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Sundargopal Ghosh
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
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5
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Afsan Z, Ahmad A, Zafar M, Das A, Roisnel T, Ghosh S. The chemistry of κ-N,S-chelated Ru(II) complexes with 1,4-diethynylbenzene. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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6
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Keller W, Hofmann M, Sárosi MB, Fanfrlík J, Hnyk D. Reactivity of Perhalogenated Octahedral Phospha- and Arsaboranes toward THF: A Joint Experimental/Computational Study. Inorg Chem 2022; 61:16565-16572. [PMID: 36229410 DOI: 10.1021/acs.inorgchem.2c00971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Reactions of the perhalogenated polyhedral pnictogenaboranes closo-1,2-Pn2B4Hal4 (Pn = P, As; Hal = Cl, Br) with Lewis bases are presently being studied with a focus on rationalizing the sites of nucleophilic attacks on clusters bearing σ-holes. These σ-holes are localized both on pnictogens and, for Hal = Br, on bromine atoms, as revealed by electrostatic potential (ESP) and intrinsic bond orbital (IBO) analyses. Surprisingly, the attack of the cyclic ether THF on closo-1,2-Pn2B4Br4 does not occur on the site with the largest positive partial charge, centered in the middle of the pnictogen-pnictogen vector. Instead, presumably promoted by the positivated bromine substituents, THF inserts into the boron-bromine bonds of the negatively charged boron atoms opposite to the pnictogen atoms to form 4-(4-bromobut-1-oxy)-closo-1,2-Pn2B4Br3 (1-PB and 1-AsB) and 4,6-(4-bromobut-1-oxy)2-closo-1,2-Pn2B4Br2 (2-PB and 2-AsB). 11B and 31P chemical shift computations at various levels support the assignments of the signals, which reflect the correctness of the molecular geometries in solutions. The Lewis-acidic perchlorinated analogues closo-1,2-P2B4Cl4, closo-1,2-As2B4Cl4, and the mixed closo-1,2-AsPB4Cl4 bear negative charges. These negative charges are revealed by the Vs,max values when computing the electrostatic potentials both on the boron and the chlorine atoms. Due to this negative charge, the analogues do not react with THF unless they are heated above 66 °C, where they slowly decompose to borate esters B(OR)3 without the formation of concrete intermediates. The evaluation of 31P NMR data of 1-PB has allowed the experimental determination of the coupling constant 1J(31P(1), 31P(2)) = |143| Hz in a closo-diphosphaborane for the first time, which agrees well with the computed value of -178 Hz. The pioneering joint experimental vs computational interpretation of 31P NMR spectra in the area of boron cluster chemistry was decisive for the structural characterization of 1-PB and 2-PB.
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Affiliation(s)
- Willi Keller
- Institut für Chemie, Universität Hohenheim, Garbenstrasse 30, 70599 Stuttgart, Germany
| | - Matthias Hofmann
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Menyhárt-Botond Sárosi
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstrasse 2, 04103 Leipzig, Germany
| | - Jindřich Fanfrlík
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, 166 10 Praha 6, Czech Republic
| | - Drahomír Hnyk
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, 250 68 Husinec-Řež, Czech Republic
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7
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Saha S, Haridas A, Assanar F, Bansal C, Sudhadevi Antharjanam PK, Ghosh S. Cooperative B-H activation by Cp* based κ 2- N, S-chelated Ru(II) and Mo(II) complexes (Cp* = η 5-C 5Me 5). Dalton Trans 2022; 51:4806-4813. [PMID: 35254378 DOI: 10.1039/d2dt00242f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The chemistry of the Cp* based κ2-N,S-chelated ruthenium complex, [Cp*RuPPh3(κ2-N,S-(NC7H4S2)], 1 with different boranes has been explored. The room temperature reaction of 1 with BH3·THF and bulky boranes, such as MesBH2 and H2BArF, led to the formation of different dihydridoborate complexes, [{κ3-S,H,H-(NBH2R)(S2H4C7)}RuCp*], 2-4 (2: R = H, 3: R = Mes, and 4: R = ArF; Mes = 2,4,6-trimethylphenyl, and ArF = 3,5-bistrifluoromethyl-benzene). In contrast, the Cp* based κ2-N,S-chelated molybdenum complex, [Cp*Mo(CO)2{κ2-N,S-(NC7H4S2)}], 5, yielded the agostic borate species, [Cp*Mo(CO)2{κ2-S,H-(NBH2R) (NC7H4S2)}], 6 and 7 (6: R = Mes and 7: R = ArF) at elevated temperatures.
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Affiliation(s)
- Suvam Saha
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
| | - Anagha Haridas
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
| | - Faneesha Assanar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
| | - Charu Bansal
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
| | | | - Sundargopal Ghosh
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
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8
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Haridas A, Bedajna S, Ghosh S. Substitution at B-H vertices of group 5 metallaborane clusters. J Organomet Chem 2022. [DOI: 10.1016/j.jorganchem.2021.122250] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Convenient preparation of arylnitromethanes by oxidation of benzaldoximes with urea hydrogen peroxide. MENDELEEV COMMUNICATIONS 2021. [DOI: 10.1016/j.mencom.2021.11.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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10
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Arrowsmith M, Endres S, Heinz M, Nestler V, Holthausen MC, Braunschweig H. Probing the Boundaries between Lewis-Basic and Redox Behavior of a Parent Borylene. Chemistry 2021; 27:17660-17668. [PMID: 34596278 PMCID: PMC9299150 DOI: 10.1002/chem.202103256] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Indexed: 11/09/2022]
Abstract
The parent borylene (CAAC)(Me3P)BH, 1 (CAAC=cyclic alkyl(amino)carbene), acts both as a Lewis base and one‐electron reducing agent towards group 13 trichlorides (ECl3, E=B, Al, Ga, In), yielding the adducts 1‐ECl3 and increasing proportions of the radical cation [1]•+ for the heavier group 13 analogues. With boron trihalides (BX3, X=F, Cl, Br, I) 1 undergoes sequential adduct formation and halide abstraction reactions to yield borylboronium cations and shows an increasing tendency towards redox processes for the heavier halides. Calculations confirm that 1 acts as a strong Lewis base towards EX3 and show a marked increase in the B−E bond dissociation energies down both group 13 and the halide group.
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Affiliation(s)
- Merle Arrowsmith
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Sara Endres
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Myron Heinz
- Institut für Anorganische und Analytische Chemie, Goethe-Universität Frankfurt am Main, Max-von-Laue-Str. 7, 60438, Frankfurt am Main, Germany
| | - Vincent Nestler
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Max C Holthausen
- Institut für Anorganische und Analytische Chemie, Goethe-Universität Frankfurt am Main, Max-von-Laue-Str. 7, 60438, Frankfurt am Main, Germany
| | - Holger Braunschweig
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
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11
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Saha K, Gayen S, Kaur U, Roisnel T, Ghosh S. Stabilization of dichalcogenide ligands in the coordination sphere of a ruthenium system. Dalton Trans 2021; 50:12990-13001. [PMID: 34581334 DOI: 10.1039/d1dt01614h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The synthesis, structure and electronic properties of tetraruthenium dichalcogenide complexes displaying the exclusive coordination mode of dichalcogenide ligands have been discussed. The reactions of Li[BH2E3] (E = S or Se) with [ClRu(μ-Cl)(p-cymene)]2 (p-cymene = η6-{p-C6H4(iPr)Me}) at room temperature yielded tetrametallic dichalcogenide complexes [{Ru2Cl2(p-cymene)2}2(μ4,η2-E2)], 1-2 (E = S (1) and Se (2)). The solid-state X-ray structure of 1 shows that two {(p-cymene)RuCl}2 moieties are bridged by a S-S bond. In addition to 2, the reaction of Li[BH2Se3] with [ClRu(μ-Cl)(p-cymene)]2 also yielded a mononuclear tris-homocubane analogue [Ru(p-cymene){Se7(BH)3}] (3) which is an analogue of 1,3,3-tris-homocubane and possesses D3 symmetry. In order to isolate the Cp* analogue of 1, the reaction of [Cp*Ru(μ-Cl)Cl]2 with Li[BH2S3] was carried out, which led to the formation of bis/tris-homocubane derivatives [(Cp*Ru)2{μ-Sn(BH)2}] (n = 7 (4) and 6 (5)) along with the formation of ruthenium disulfide complexes [(RuCp*)2(μ,η2:η2-S2)(μ,η1:η1-S2)] and [(RuCp*)2(μ-SBHS-κ1B:κ2S:κ2S)(μ,η1:η1-S2)]. Complexes 1-5 have been characterized by multi-nuclear NMR, IR, UV-vis spectroscopy, and mass spectrometry and their molecular formulations (except 2) have been determined by single crystal X-ray crystallography. Furthermore, DFT calculations were performed that rationalize the stabilization of the dichalcogenide units (E22-) by the tetrametallic systems in 1-2.
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Affiliation(s)
- Koushik Saha
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
| | - Sourav Gayen
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
| | - Urminder Kaur
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
| | - Thierry Roisnel
- Univ Rennes, CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226, F-35042 Rennes, France
| | - Sundargopal Ghosh
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
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12
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Bochmann S, Böhme U, Brendler E, Friebel M, Gerwig M, Gründler F, Günther B, Kroke E, Lehnert R, Ruppel L. Unexpected Formation of the Highly Symmetric Borate Ion [B(SiCl
3
)
4
]
−. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100246] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Uwe Böhme
- Institut für Anorganische Chemie TU Bergakademie Freiberg Leipziger Straße 29 09599 Freiberg Germany
| | - Erica Brendler
- Institut für Analytische Chemie TU Bergakademie Freiberg Leipziger Straße 29 09599 Freiberg Germany
| | - Mike Friebel
- Institut für Anorganische Chemie TU Bergakademie Freiberg Leipziger Straße 29 09599 Freiberg Germany
| | - Maik Gerwig
- Institut für Anorganische Chemie TU Bergakademie Freiberg Leipziger Straße 29 09599 Freiberg Germany
| | - Franziska Gründler
- Institut für Anorganische Chemie TU Bergakademie Freiberg Leipziger Straße 29 09599 Freiberg Germany
| | - Betty Günther
- Institut für Anorganische Chemie TU Bergakademie Freiberg Leipziger Straße 29 09599 Freiberg Germany
| | - Edwin Kroke
- Institut für Anorganische Chemie TU Bergakademie Freiberg Leipziger Straße 29 09599 Freiberg Germany
| | - Robert Lehnert
- Wacker Chemie AG Friedrich-von-Heyden-Platz 1 01612 Nünchritz Germany
| | - Lars Ruppel
- Wacker Chemie AG Friedrich-von-Heyden-Platz 1 01612 Nünchritz Germany
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13
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Prakash R, Haridas A, Bakthavachalam K, Roisnel T, Halet JF, Ghosh S. Chemistry of group 5 metallaboranes with heterocyclic thiol ligands: a combined experimental and theoretical study. Dalton Trans 2021; 50:4036-4044. [PMID: 33662076 DOI: 10.1039/d0dt04362a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Thermolysis of [(Cp*Nb)2(B2H6)2], 1b (Cp* = η5-C5Me5), with 2-mercaptobenzothiazole, C6H4NSCSH (MBT), and 2-mercaptobenzoxazole, C6H4NOCSH (MBO), yielded hydrogen substituted compounds 2 and 3 with a general formula [(Cp*Nb)2(B2H6)(B2H5L)] (2: L = C6H4NSCS and 3: L = C6H4NOCS). A similar reaction of 1b with Ph2Se2 yielded the monosubstituted derivative [(Cp*Nb)2(B2H6){B2H5(PhSe)}], 4. All further efforts towards persubstitution of 1b under various drastic conditions were unfruitful. In parallel, in an effort to find a better synthetic route to the known Ta-aziridine complex [Cp*TaBH(C7H4NS2)CH2S2NC6H4], Cp*TaCl4 was treated with a 2-mercaptobenzothiazolyl-based borate ligand Na[H2B(C6H4NSCS)2]. Surprisingly, the reaction led to the formation of the half-sandwich trichloroaryltantalum(v) complex [Cp*TaCl3{κ2-N,S-C6H4NSCS}], 5, containing a heterocyclic thiol ligand. Using an alternative method complex 5 was isolated in good yield when Cp*TaCl4 was treated with the potassium salt of 2-mercaptobenzothiazole K[C6H4NSCS]. All the compounds were characterized by 1H, 11B{1H}, and 13C{1H} NMR spectroscopy, and their structures were unequivocally established by crystallographic analysis.
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Affiliation(s)
- Rini Prakash
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, India.
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14
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Zafar M, Ramalakshmi R, Ahmad A, Antharjanam PKS, Bontemps S, Sabo-Etienne S, Ghosh S. Cooperative B-H and Si-H Bond Activations by κ 2- N, S-Chelated Ruthenium Borate Complexes. Inorg Chem 2021; 60:1183-1194. [PMID: 33390001 DOI: 10.1021/acs.inorgchem.0c03306] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cooperative E-H (E = B, Si) bond activations employing κ2-N,S-chelated ruthenium borate species, [PPh3{κ2-N,S-(NS2C7H4)}Ru{κ3-H,S,S'-H2B(NC7H4S2)2}], (1) are established. Treatment of 1 with BH3·SMe2 yielded the six-membered ruthenaheterocycle [PPh3{κ2-S,H-(BH3NS2C7H4)}Ru{κ3-H,S,S'-H2B(C7H4NS2)2}] (2) formed by a hemilabile ring opening of a Ru-N bond and capturing of a BH3 unit coordinated in an "end-on" fashion. On the other hand, the bulky borane H2BMes shows different reactivity with 1 that led to the formation of the two dihydroborate complexes [{κ3-S,H,H-(NBH2Mes)(S2C7H4)}Ru{κ3-H,S,S'-H2B(C7H4NS2)2}] (3) and [PPh3{κ3-S,H,H-(NBH2Mes)(S2C7H4)}Ru(κ2-N,S-C7H4NS2)] (4), in which H2BMes has been inserted into the Ru-N bond of the initial κ2-N,S-chelated ligand. In an attempt to directly activate hydrosilanes by 1, reactions were carried out with H2SiPh2 that yielded two isomeric five-membered ruthenium silyl complexes, namely [PPh3{κ2-S,Si-(NSiPh2)(S2C7H4)}Ru{κ3-H,S,S'-H2B(C7H4NS2)2}] (5a,b), and the hydridotrisilyl complex [Ru(H){κ2-S,Si-(SiPh2NC7H4S2}3] (6). These complexes were generated by Si-H bond activation with the release of H2 and the formation of N-Si and Ru-Si bonds. When the reaction of 1 was carried out in the presence of PhSiH3, the reaction only produced the analogous complexes [PPh3{κ2-S,Si-(NSiPhH)(S2C7H4)}Ru{κ3-H,S,S'-H2B(C7H4NS2)2}] (5a',b'). Density functional theory (DFT) calculations have been used to probe the bonding modes of boranes/silane with the ruthenium center.
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Affiliation(s)
| | | | | | | | - Sébastien Bontemps
- LCC-CNRS, Université de Toulouse, CNRS, UPS, 205 route de Narbonne, BP 44099, F-31077 Toulouse Cedex 4, France
| | - Sylviane Sabo-Etienne
- LCC-CNRS, Université de Toulouse, CNRS, UPS, 205 route de Narbonne, BP 44099, F-31077 Toulouse Cedex 4, France
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15
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Hasche P, Haak J, Anke F, Kubis C, Baumann W, Drexler HJ, Jiao H, Beweries T. Dehydropolymerisation of methylamine borane using highly active rhodium(iii) bis(thiophosphinite) pincer complexes: catalytic and mechanistic insights. Catal Sci Technol 2021. [DOI: 10.1039/d1cy00124h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The bis(thiophosphinite) pincer complexes [(RPSCSPR)Rh(py)(H)(Cl)] (RPSCSPR = C6H4–2,6-(SPR2)2 with R = iPr, 2a and R = Ph, 2b) are highly active precatalysts for the dehydropolymerisation of methylamine borane.
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Affiliation(s)
- Patrick Hasche
- Leibniz-Institut für Katalyse e.V. (LIKAT)
- 18059 Rostock
- Germany
| | - Julia Haak
- Leibniz-Institut für Katalyse e.V. (LIKAT)
- 18059 Rostock
- Germany
| | - Felix Anke
- Leibniz-Institut für Katalyse e.V. (LIKAT)
- 18059 Rostock
- Germany
| | - Christoph Kubis
- Leibniz-Institut für Katalyse e.V. (LIKAT)
- 18059 Rostock
- Germany
| | | | | | - Haijun Jiao
- Leibniz-Institut für Katalyse e.V. (LIKAT)
- 18059 Rostock
- Germany
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16
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Prakash R, Nanda Pradhan A, Ghosh S. Chemistry of bimetallic hexaborane(10) analogues: A combined experimental and theoretical study. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119898] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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Ludwig M, Himmel D, Hillebrecht H. GIAO versus GIPAW: Comparison of Methods To Calculate 11B NMR Shifts of Icosahedral Closo-Heteroboranes toward Boron-Rich Borides. J Phys Chem A 2020; 124:2173-2185. [PMID: 31999459 DOI: 10.1021/acs.jpca.9b06582] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this work, we perform first-principle density functional theory calculations with the Perdew-Burke-Ernzerhof (PBE) exchange correlation functional to compare the results of the gauge-including atomic orbital (GIAO) method with the gauge-including projector-augmented wave (GIPAW) approach for isotropic 11B nuclear magnetic resonance shifts. GIPAW had been used successfully for the theoretical calculation of nuclear magnetic parameters of 11B species in strong ionic solid-phase compounds such as borates but had been applied very rarely to structures where boron is mainly involved in complex covalent bonding situations, for example, in icosahedra of boron-rich borides. Thus, we investigate the accuracy of both well-known methods and reliability of the effective treatment of core electrons on a test set containing 16 experimentally known closo-(hetero)dodecaboranes. In general, we find very good agreement between GIAO and GIPAW when compared to experimental observations. However, accidental degeneracies of the shift values are better predicted by GIPAW. The optimized molecular geometries on the PBE level agree well with gaseous electron diffraction data and lead to theoretical isotropic chemical 11B shifts with root-mean-square errors of 2.1 and 1.0 ppm depending on the used model of converting absolute shieldings to chemical shifts. The comparison with results from hybrid functionals (B3LYP, B3LYP-D2, and PBE0) shows a minor improvement in accuracy, which is in agreement with 13C shifts of sp3-hybridized species. In order to prove the reliability of the conversion parameters obtained by PBE, we report the calculated 11B shifts of 1,2-, 1,7-, and 1,12-PCB10H11 with GIAO and GIPAW to our knowledge for the first time. Additionally, Bader's analysis is carried out on the converged electron density for all boron species within the molecular test set, yielding no simple direct relation between charge and isotropic shifts.
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Affiliation(s)
- Martin Ludwig
- Institut für Anorganische und Analytische Chemie, Albert-Ludwigs-Universität, Albertstraße 21, 79104 Freiburg, Germany
| | - Daniel Himmel
- Institut für Anorganische und Analytische Chemie, Albert-Ludwigs-Universität, Albertstraße 21, 79104 Freiburg, Germany
| | - Harald Hillebrecht
- Institut für Anorganische und Analytische Chemie, Albert-Ludwigs-Universität, Albertstraße 21, 79104 Freiburg, Germany
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18
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Prakash R, Pradhan AN, Jash M, Kahlal S, Cordier M, Roisnel T, Halet JF, Ghosh S. Diborane(6) and Its Analogues Stabilized by Mono-, Bi-, and Trinuclear Group 7 Templates: Combined Experimental and Theoretical Studies. Inorg Chem 2020; 59:1917-1927. [PMID: 31934757 DOI: 10.1021/acs.inorgchem.9b03217] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Irradiation of [Re2(CO)10] in the presence of BH3·thf resulted in the formation of several rhenium diborane(6) species, for example, [{(OC)4Re}{Re(CO)3}2(μ3-η2:η2:η2-B2H6)(μ-H)], 1; [{(OC)4Re}2{Re(CO)3}(μ3-η2:η2:η1-B2H6)(μ-H)], 2; and [{(OC)4Re}2(μ-η2:η2-B2H6)], 3, comprising diverse coordination modes of the [B2H6]2- ligand. Compound 1 contains a tris(bidentate) [B2H6]2- unit, whereas 2 consists of an unsymmetrically bound [μ3-η2:η2:η1-B2H6]2- ligand. In contrast, the irradiation of [Mn2(CO)10] with BH3·thf yielded only the Mn analogue of 1, [{(OC)4Mn}{Mn(CO)3}2(μ3-η2:η2:η2-B2H6)(μ-H)], 1'. In an attempt to generate the bimetallic Mn-diborane(6), we have carried out the reaction of 1' with PCy3 under photolytic conditions. The reaction led to the formation of two single base stabilized unsymmetrical diborane(5) species, [{Mn(CO)3}{Mn(CO)2PCy3}(μ-η2:η2-B2H5·PCy3)(μ-H)], 4, and [{Mn(CO)2PCy3}(η3-B2H5·PCy3)], 5. As [B2H6]2- and [B2H5·PCy3]- are isoelectronic, the bondings in 4 and 5 are analogous to that of diborane(6) species 1-3. All the new species have been characterized spectroscopically, and their structures were further confirmed by single-crystal X-ray diffraction studies. DFT-type quantum chemical calculations were carried out that provided insight into the bonding interaction of [B2H6]2- and [B2H5·PCy3]- with the M(CO)n fragments.
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Affiliation(s)
- Rini Prakash
- Department of Chemistry , Indian Institute of Technology Madras , Chennai 600036 , India
| | - Alaka Nanda Pradhan
- Department of Chemistry , Indian Institute of Technology Madras , Chennai 600036 , India
| | - Madhuri Jash
- Department of Chemistry , Indian Institute of Technology Madras , Chennai 600036 , India
| | - Samia Kahlal
- CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226 , Univ Rennes , F-35000 Rennes , France
| | - Marie Cordier
- CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226 , Univ Rennes , F-35000 Rennes , France
| | - Thierry Roisnel
- CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226 , Univ Rennes , F-35000 Rennes , France
| | - Jean-François Halet
- CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226 , Univ Rennes , F-35000 Rennes , France
| | - Sundargopal Ghosh
- Department of Chemistry , Indian Institute of Technology Madras , Chennai 600036 , India
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19
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Joseph B, Prakash R, Pathak K, Roisnel T, Kahlal S, Halet JF, Ghosh S. A combined experimental and theoretical study of bimetallic bis- and tris-homocubane analogues. NEW J CHEM 2020. [DOI: 10.1039/c9nj05117a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Various bimetallic bis- and tris-homocubane analogues of group 9 transition metals have been isolated and structurally characterized employing Li[BH2E3] (E = S or Se).
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Affiliation(s)
- Benson Joseph
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600036
- India
| | - Rini Prakash
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600036
- India
| | - Kriti Pathak
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600036
- India
| | - Thierry Roisnel
- Univ. Rennes
- CNRS
- Institut des Sciences Chimiques de Rennes
- UMR 6226
- F-35000 Rennes
| | - Samia Kahlal
- Univ. Rennes
- CNRS
- Institut des Sciences Chimiques de Rennes
- UMR 6226
- F-35000 Rennes
| | - Jean-François Halet
- Univ. Rennes
- CNRS
- Institut des Sciences Chimiques de Rennes
- UMR 6226
- F-35000 Rennes
| | - Sundargopal Ghosh
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600036
- India
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20
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Zafar M, Ramalakshmi R, Pathak K, Ahmad A, Roisnel T, Ghosh S. Five-Membered Ruthenacycles: Ligand-Assisted Alkyne Insertion into 1,3-N,S-Chelated Ruthenium Borate Species. Chemistry 2019; 25:13537-13546. [PMID: 31332858 DOI: 10.1002/chem.201902663] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Indexed: 11/10/2022]
Abstract
Building upon previous work, the chemistry of [(η6 -p-cymene)Ru{P(OMe)2 OR}Cl2 ], (R=H or Me) has been extended with [H2 B(mbz)2 ]- (mbz=2-mercaptobenzothiazolyl) using different Ru precursors and borate ligands. As a result, a series of 1,3-N,S-chelated ruthenium borate complexes, for example, [(κ2 -N,S-L)PR3 Ru{κ3 -H,S,S'-H2 B(L)2 }], (2 a-d and 2 a'-d'; R=Ph, Cy, OMe or OPh and L=C5 H4 NS or C7 H4 NS2 ) and [Ru{κ3 -H,S,S'-H2 B(L)2 }2 ], (3: L=C5 H4 NS, 3': L=C7 H4 NS2 ) were isolated upon treatment of [(η6 -p-cymene)RuCl2 PR3 ], 1 a-d (R=Ph, Cy, OMe or OPh) with [H2 B(mp)2 ]- or [H2 B(mbz)2 ]- ligands (mp=2-mercaptopyridyl). All the Ru borate complexes, 2 a-d and 2 a'-d' are stabilized by phosphine/phosphite and hemilabile N,S-chelating ligands. Treatment of these Ru borate species, 2 a'-c' with various terminal alkynes yielded two different types of five-membered ruthenacycle species, namely [PR3 {C7 H4 S2 -(E)-N-C=CH(R')}Ru{κ3 -H,S,S'-H2 B(L)2 }], (4-4'; R=Ph and R'=CO2 Me or C6 H4 NO2 ; L=C7 H4 NS2 ) and [PR3 {C7 H4 NS-(E)-S-C=CH(R')}Ru{κ3 -H,S,S'-H2 B(L)2 }], (5-5', 6 and 7; R=Ph, Cy or OMe and R'=CO2 Me or C6 H4 NO2 ; L=C7 H4 NS2 ). All these five-membered ruthenacycle species contain an exocyclic C=C moiety, presumably formed by the insertion of a terminal alkyne into the Ru-N and Ru-S bonds. The new species have been characterized spectroscopically and the structures were further confirmed by single-crystal X-ray diffraction analysis. Theoretical studies and chemical-bonding analyses established that charge transfer occurs from phosphorus to ruthenium center following the trend PCy3 <PPh3 <P(OPh)3 <P(OMe)3 .
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Affiliation(s)
- Mohammad Zafar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Rongala Ramalakshmi
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Kriti Pathak
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Asif Ahmad
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Thierry Roisnel
- Univ Rennes, CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226, 35042, Rennes, France
| | - Sundargopal Ghosh
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
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21
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Bäcker A, Li Y, Fritz M, Grätz M, Ke Z, Langer R. Redox-Active, Boron-Based Ligands in Iron Complexes with Inverted Hydride Reactivity in Dehydrogenation Catalysis. ACS Catal 2019. [DOI: 10.1021/acscatal.9b00882] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andreas Bäcker
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Straße, 35032 Marburg, Germany
| | - Yinwu Li
- School of Materials Science & Engineering, PCFM Lab, Sun Yat-sen University, Guangzhou 510275, China
| | - Maximilian Fritz
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Straße, 35032 Marburg, Germany
| | - Maik Grätz
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Straße, 35032 Marburg, Germany
| | - Zhuofeng Ke
- School of Materials Science & Engineering, PCFM Lab, Sun Yat-sen University, Guangzhou 510275, China
| | - Robert Langer
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Straße, 35032 Marburg, Germany
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22
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Bhattacharyya M, Prakash R, Jagan R, Ghosh S. Metallaheteroboranes containing group 16 elements: An experimental and theoretical study. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2019.01.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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23
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Kar S, Bairagi S, Saha K, Raghavendra B, Ghosh S. Chalcogen stabilized trimetallic clusters: synthesis, structures, and bonding of [(Cp*M)3(E)6+m(BH)n] (M = Nb or Ta; E = S or Se; m = 0 or 1 or 2; n = 0 or 1). Dalton Trans 2019; 48:4203-4210. [DOI: 10.1039/c8dt05061a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An unusual trimetallic octaselenide complex, [(Cp*Ta)3(μ-Se)4{μ-Se2(Se2)}], has been synthesized and structurally characterized.
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Affiliation(s)
- Sourav Kar
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600036
- India
| | - Subhash Bairagi
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600036
- India
| | - Koushik Saha
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600036
- India
| | - Beesam Raghavendra
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600036
- India
| | - Sundargopal Ghosh
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600036
- India
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24
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Prakash R, De A, Kirubakaran B, Ghosh S. Metal-Rich Oxametallaboranes of Group 5 Metals: Synthesis and Structure of a Face-Fused μ7-Boride Cluster. Inorg Chem 2018; 57:14748-14757. [DOI: 10.1021/acs.inorgchem.8b02512] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rini Prakash
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, India
| | - Anangsha De
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, India
| | | | - Sundargopal Ghosh
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, India
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25
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Mondal B, Bag R, Ghosh S. Combined Experimental and Theoretical Investigations of Group 6 Dimetallaboranes [(Cp*M)2B4H10] (M = Mo and W). Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00204] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bijan Mondal
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, India
| | - Ranjit Bag
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, India
| | - Sundargopal Ghosh
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, India
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26
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Bhattacharyya M, Yuvaraj K, Chanda A, Ramkumar V, Ghosh S. Metal‐Rich Metallaboranes: Structures and Geometries of Heterometallic µ
9
‐Boride Clusters. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800375] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Kuppusamy Yuvaraj
- Department of Chemistry Indian Institute of Technology Madras 600036 Chennai India
| | - Alokananda Chanda
- Department of Chemistry Indian Institute of Technology Madras 600036 Chennai India
| | | | - Sundargopal Ghosh
- Department of Chemistry Indian Institute of Technology Madras 600036 Chennai India
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27
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Bag R, Mondal B, Bakthavachalam K, Roisnel T, Ghosh S. Heterometallic boride clusters: synthesis and characterization of butterfly and square pyramidal boride clusters*. PURE APPL CHEM 2017. [DOI: 10.1515/pac-2017-1001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
A number of heterometallic boride clusters have been synthesized and structurally characterized using various spectroscopic and crystallographic analyses. Thermolysis of [Ru3(CO)12] with [Cp*WH3(B4H8)] (1) yielded [{Cp*W(CO)2}2(μ
4-B){Ru(CO)3}2(μ-H)] (2), [{Cp*W(CO)2}2(μ
5-B){Ru(CO)3}2{Ru(CO)2}(μ-H)] (3), [{Cp*W(CO)2}(μ
5-B){Ru(CO)3}4] (4) and a ditungstaborane cluster [(Cp*W)2B4H8Ru(CO)3] (5) (Cp*=η
5-C5Me5). Compound 2 contains 62 cluster valence-electrons, in which the boron atom occupies the semi-interstitial position of a M4-butterfly core, composed of two tungsten and two ruthenium atoms. Compounds 3 and 4 can be described as hetero-metallic boride clusters that contain 74-cluster valence electrons (cve), in which the boron atom is at the basal position of the M5-square pyramidal geometry. Cluster 5 is analogous to known [(Cp*W)2B5H9] where one of the BH vertices has been replaced by isolobal {Ru(CO)3} fragment. Computational studies with density functional theory (DFT) methods at the B3LYP level have been used to analyze the bonding of the synthesized molecules. The optimized geometries and computed 11B NMR chemical shifts satisfactorily corroborate with the experimental data. All the compounds have been characterized by mass spectrometry, IR, 1H, 11B and 13C NMR spectroscopy, and the structural architectures were unequivocally established by crystallographic analyses of clusters 2–5.
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Affiliation(s)
- Ranjit Bag
- Department of Chemistry , Indian Institute of Technology Madras , Chennai 600036 , India
| | - Bijan Mondal
- Department of Chemistry , Indian Institute of Technology Madras , Chennai 600036 , India
| | - K. Bakthavachalam
- Department of Chemistry , Indian Institute of Technology Madras , Chennai 600036 , India
| | - Thierry Roisnel
- Institut des Sciences Chimiques de Rennes , UMR 6226 CNRS-Université de Rennes 1-Ecole Nationale Supérieure de Chimie de Rennes , F-35042 Rennes Cedex , France
| | - Sundargopal Ghosh
- Department of Chemistry , Indian Institute of Technology Madras , Chennai 600036 , India
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28
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Macháček J, Bühl M, Fanfrlík J, Hnyk D. Nuclear Magnetic Shielding of Monoboranes: Calculation and Assessment of 11B NMR Chemical Shifts in Planar BX3 and in Tetrahedral [BX4]− Systems. J Phys Chem A 2017; 121:9631-9637. [DOI: 10.1021/acs.jpca.7b09831] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jan Macháček
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, v.v.i., 1001, CZ-250 68 Husinec-Řež, Czech Republic
| | - Michael Bühl
- School
of Chemistry, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9ST, United Kingdom
| | - Jindřich Fanfrlík
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, CZ-66 10 Prague 6, Czech Republic
| | - Drahomír Hnyk
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, v.v.i., 1001, CZ-250 68 Husinec-Řež, Czech Republic
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29
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Saha K, Ramalakshmi R, Borthakur R, Gomosta S, Pathak K, Dorcet V, Roisnel T, Halet JF, Ghosh S. An Efficient Method for the Synthesis of Boratrane Complexes of Late Transition Metals. Chemistry 2017; 23:18264-18275. [PMID: 28949073 DOI: 10.1002/chem.201704332] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Indexed: 11/08/2022]
Abstract
In a quest for efficient precursors for the synthesis of boratrane complexes of late transition metals, we have developed a useful synthetic method using [L'M(μ-Cl)Clx ]2 as precursors (L'=η6 -p-cymene, M=Ru, x=1; L'=COD, M=Rh, x=0 and L'=Cp*, M=Ir or Rh, x=1; COD=1,5-cyclooctadiene, Cp*=η5 -C5 Me5 ). For example, treatment of Na[(H3 B)bbza] or Na[(H2 B)mp2 ] (bbza=bis(benzothiazol-2-yl)amine; mp=2-mercaptopyridyl) with [L'M(μ-Cl)Clx ]2 yielded [(η6 -p-cymene)RuBH{(NCSC6 H4 )(NR)}2 ] (2; R=NCSC6 H4 ), [{N(NCSC6 H4 )2 }RhBH{(NCSC6 H4 )(NR)}2 ] (3; R=NCS-C6 H4 ), [(η6 -p-cymene)RuBH(L)2 ] (5; L=C5 H4 NS), and [Cp*MBH(L)2 ] (6 and 7; L=C5 H4 NS, M=Ir or Rh). In order to delineate the significance of the ligands, we studied the reactivity of [(COD)Rh(μ-Cl)]2 with Na[(H3 B)bbza], which led to the formation of the isomeric agostic complexes [(η4 -COD)Rh(μ-H)BHRh(C14 H8 N3 S2 )3 ], 4 a and 4 b, in parallel to the formation of 16-electron square-pyramidal rhodaboratrane complex 3. Compounds 4 a and 4 b show two different geometries, in which the Rh-B bonds are shorter than in the reported Rh agostic complexes. The new compounds have been characterized in solution by various spectroscopic analyses, and their structural arrangements have been unequivocally established by crystallographic analyses. DFT calculations provide useful insights regarding the stability of these metallaboratrane complexes as well as their M→B bonding interactions.
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Affiliation(s)
- Koushik Saha
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Rongala Ramalakshmi
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Rosmita Borthakur
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Suman Gomosta
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Kriti Pathak
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Vincent Dorcet
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS-Ecole Nationale Supérieure de Chimie de Rennes, Université de Rennes 1, 35042, Rennes Cedex, France
| | - Thierry Roisnel
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS-Ecole Nationale Supérieure de Chimie de Rennes, Université de Rennes 1, 35042, Rennes Cedex, France
| | - Jean-François Halet
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS-Ecole Nationale Supérieure de Chimie de Rennes, Université de Rennes 1, 35042, Rennes Cedex, France
| | - Sundargopal Ghosh
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
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30
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Chlorination of the terminal hydrogen atoms in the hydrogen-rich group 5 dimetallaboranes (Cp*M) 2 (B 2 H 6 ) 2 (M = Nb, Ta). J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2017.07.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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31
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Keller W, Hofmann M. Syntheses and DFT/GIAO/NMR Study of Polyhedral Selenaboranes: The First Selenahexaborane(5) closo-1-SeB 5Cl 5. Z Anorg Allg Chem 2017. [DOI: 10.1002/zaac.201700052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Willi Keller
- Institut für Chemie; Universität Hohenheim; Garbenstrasse 30 70599 Stuttgart Germany
| | - Matthias Hofmann
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
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32
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Boar P, Streitberger M, Lönnecke P, Hey-Hawkins E. Copper(I) Complexes of a Flexible Bis-phospholane Ligand: Route to Paddle-Wheel- and Box-Type Macrocycles. Inorg Chem 2017; 56:7285-7291. [DOI: 10.1021/acs.inorgchem.7b01046] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Paul Boar
- Faculty of Chemistry and Mineralogy, Institute
of Inorganic Chemistry, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
| | - Markus Streitberger
- Faculty of Chemistry and Mineralogy, Institute
of Inorganic Chemistry, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
| | - Peter Lönnecke
- Faculty of Chemistry and Mineralogy, Institute
of Inorganic Chemistry, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
| | - Evamarie Hey-Hawkins
- Faculty of Chemistry and Mineralogy, Institute
of Inorganic Chemistry, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
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33
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Medved' M, Demissie TB, McKee ML, Hnyk D. The behavior of a paramagnetic system in electric and magnetic fields as exemplified by revisiting Li@B 10H 14. Phys Chem Chem Phys 2017; 19:12229-12236. [PMID: 28451659 DOI: 10.1039/c7cp00658f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electric and magnetic properties of the Li@B10H14 complex, considered as a novel inorganic electride-type system with potential for second-order non-linear optical (NLO) applications, have already been studied. However, the reported C2v structure is not the global energy minimum and therefore its electronic and magnetic properties need to be revisited. Moreover, by applying more accurate computational protocols (ROHF-CCSD/CCSD(T) and larger basis sets) we show that the model chemistry used earlier (UMP2/6-31+G(d)) is not sufficient for reliable description of the NLO responses of this open-shell doublet complex. The global minimum based on the Cs symmetry is significantly (by ca. 25 kcal mol-1) more stable than the C2v structure and it should be viewed as a system with moderate NLO responses. An excess of unpaired electron density is also responsible for the contact and pseudo-contact contributions to the magnetic properties, which was not considered in the earlier work.
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Affiliation(s)
- Miroslav Medved'
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University Olomouc, 17. listopadu 1192/12, CZ-771 46 Olomouc, Czech Republic
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34
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Conformational analysis of N→BH3, N→BF3, and N-CH3+complexes with ibuprofen-derivative amides. HETEROATOM CHEMISTRY 2017. [DOI: 10.1002/hc.21368] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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35
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Chemistry of ruthenium σ-borane complex, [Cp∗RuCO(μ-H)BH2L] (Cp∗= η5-C5Me5; L = C7H4NS2) with terminal and internal alkynes: Structural characterization of vinyl hydroborate and vinyl complexes of ruthenium. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.01.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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36
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Štíbr B, Holub J, Bakardjiev M, Lane PD, McKee ML, Wann DA, Hnyk D. Unusual Cage Rearrangements in 10-Vertex nido-5,6-Dicarbaborane Derivatives: An Interplay between Theory and Experiment. Inorg Chem 2017; 56:852-860. [PMID: 28004918 DOI: 10.1021/acs.inorgchem.6b02320] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reaction between selected X-nido-5,6-C2B8H11 compounds (where X = Cl, Br, I) and "Proton Sponge" [PS; 1,8-bis(dimethylamino)naphthalene], followed by acidification, results in extensive rearrangement of all cage vertices. Specifically, deprotonation of 7-X-5,6-C2B8H11 compounds with one equivalent of PS in hexane or CH2Cl2 at ambient temperature led to a 7 → 10 halogen rearrangement, forming a series of PSH+[10-X-5,6-C2B8H10]- salts. Reprotonation using concentrated H2SO4 in CH2Cl2 generates a series of neutral carbaboranes 10-X-5,6-C2B8H11, with the overall 7 → 10 conversion being 75%, 95%, and 100% for X = Cl, Br, and I, respectively. Under similar conditions, 4-Cl-5,6-C2B8H11 gave ∼66% conversion to 3-Cl-5,6-C2B8H11. Since these rearrangements could not be rationalized using the B-vertex swing mechanism, new cage rearrangement mechanisms, which are substantiated using DFT calculations, have been proposed. Experimental 11B NMR chemical shifts are well reproduced by the computations; as expected δ(11B) for B(10) atoms in derivatives with X = Br and I are heavily affected by spin-orbit coupling.
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Affiliation(s)
- Bohumil Štíbr
- Institute of Inorganic Chemistry of the ASCR, v.v.i. , CZ-250 68 Husinec-Řež, Czech Republic
| | - Josef Holub
- Institute of Inorganic Chemistry of the ASCR, v.v.i. , CZ-250 68 Husinec-Řež, Czech Republic
| | - Mario Bakardjiev
- Institute of Inorganic Chemistry of the ASCR, v.v.i. , CZ-250 68 Husinec-Řež, Czech Republic
| | - Paul D Lane
- Department of Chemistry, University of York , Heslington, York, U.K. YO10 5DD
| | - Michael L McKee
- Department of Chemistry and Biochemistry, Auburn University , Auburn, Alabama 36849, United States
| | - Derek A Wann
- Department of Chemistry, University of York , Heslington, York, U.K. YO10 5DD
| | - Drahomír Hnyk
- Institute of Inorganic Chemistry of the ASCR, v.v.i. , CZ-250 68 Husinec-Řež, Czech Republic
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37
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Ay AN, Akar H, Zaulet A, Viňas C, Teixidor F, Zumreoglu-Karan B. Carborane-layered double hydroxide nanohybrids for potential targeted- and magnetically targeted-BNCT applications. Dalton Trans 2017; 46:3303-3310. [DOI: 10.1039/c7dt00100b] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Carborane-intercalated layered double hydroxide nanohybrids (CB-LDH) and a magnesium ferrite (MF) supported-CB-LDH core–shell nanocomposite (CB-LDH@MF) are reported.
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Affiliation(s)
- Ahmet Nedim Ay
- Department of Chemistry
- Hacettepe University
- 06800 Ankara
- Turkey
| | - Hande Akar
- Department of Chemistry
- Hacettepe University
- 06800 Ankara
- Turkey
| | - Adnana Zaulet
- Institut de Ciència de MaterialsdeBarcelona(ICMAB-CSIC)
- 08193 Bellaterra
- Spain
| | - Clara Viňas
- Institut de Ciència de MaterialsdeBarcelona(ICMAB-CSIC)
- 08193 Bellaterra
- Spain
| | - Francesc Teixidor
- Institut de Ciència de MaterialsdeBarcelona(ICMAB-CSIC)
- 08193 Bellaterra
- Spain
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38
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Borthakur R, Prakash R, Nandi P, Ghosh S. Metal rich metallaboranes of group 9 transition metals. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.10.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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39
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Bakthavachalam K, Yuvaraj K, Zafar M, Ghosh S. Reactivity of [M2
(μ-Cl)2
(cod)2
] (M=Ir, Rh) and [Ru(Cl)2
(cod)(CH3
CN)2
] with Na[H2
B(bt)2
]: Formation of Agostic versus Borate Complexes. Chemistry 2016; 22:17291-17297. [DOI: 10.1002/chem.201603480] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2016] [Indexed: 11/11/2022]
Affiliation(s)
- K. Bakthavachalam
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600036 India
| | - K. Yuvaraj
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600036 India
| | - Mohammad Zafar
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600036 India
| | - Sundargopal Ghosh
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600036 India
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40
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Mondal B, Bhattacharya S, Ghosh S. Heterometallic boride clusters of group 6 and 9 transition metals. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.06.027] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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41
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Fohlmeister L, Stasch A. Ring-Shaped Phosphinoamido-Magnesium-Hydride Complexes: Syntheses, Structures, Reactivity, and Catalysis. Chemistry 2016; 22:10235-46. [PMID: 27271460 DOI: 10.1002/chem.201601623] [Citation(s) in RCA: 101] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Indexed: 11/10/2022]
Abstract
A series of magnesium(II) complexes bearing the sterically demanding phosphinoamide ligand, L(-) =Ph2 PNDip(-) , Dip=2,6-diisopropylphenyl, including heteroleptic magnesium alkyl and hydride complexes are described. The ligand geometry enforces various novel ring and cluster geometries for the heteroleptic compounds. We have studied the stoichiometric reactivity of [(LMgH)4 ] towards unsaturated substrates, and investigated catalytic hydroborations and hydrosilylations of ketones and pyridines. We found that hydroborations of two ketones with pinacolborane using various Mg precatalysts is very rapid at room temperature with very low catalyst loadings, and ketone hydrosilylation using phenylsilane is rapid at 70 °C. Our studies point to an insertion/σ-bond metathesis catalytic cycle of an in situ formed "MgH2 " active species.
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Affiliation(s)
- Lea Fohlmeister
- School of Chemistry, Monash University, 17 Rainforest Walk, Melbourne, Victoria, 3800, Australia
| | - Andreas Stasch
- School of Chemistry, Monash University, 17 Rainforest Walk, Melbourne, Victoria, 3800, Australia. .,School of Chemistry, University of St Andrews, North Haugh, St. Andrews, KY16 9ST, UK.
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42
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Saldin VI, Sukhovey VV, Savchenko NN, Slobodyuk AB, Ignatieva LN. Thermal studies of sodium tetrahydroborate–potassium tetrafluoroborate mixtures. RUSS J INORG CHEM+ 2016. [DOI: 10.1134/s0036023616050193] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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43
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44
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Yuvaraj K, Bhattacharyya M, Prakash R, Ramkumar V, Ghosh S. New Trinuclear Complexes of Group 6, 8, and 9 Metals with a Triply Bridging Borylene Ligand. Chemistry 2016; 22:8889-96. [DOI: 10.1002/chem.201600637] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Indexed: 11/08/2022]
Affiliation(s)
- K. Yuvaraj
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600036 India
| | - Moulika Bhattacharyya
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600036 India
| | - Rini Prakash
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600036 India
| | - V. Ramkumar
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600036 India
| | - Sundargopal Ghosh
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600036 India
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45
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Roy DK, Borthakur R, Prakash R, Bhattacharya S, Jagan R, Ghosh S. Hypoelectronic 8-11-Vertex Irida- and Rhodaboranes. Inorg Chem 2016; 55:4764-70. [PMID: 27139525 DOI: 10.1021/acs.inorgchem.6b00076] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of novel isocloso-diiridaboranes [(Cp*Ir)2B6H6], 1, 2; [1,7-(Cp*Ir)2B8H8], 4; [1,4-(Cp*Ir)2B8H8], 5; [(Cp*Ir)2B9H9], 8; isonido-[(Cp*Ir)2B7H7], 3; and 10-vertex cluster [5,7-(Cp*Ir)2B8H12], 6 (Cp* = η(5)-C5Me5) have been isolated and structurally characterized from the pyrolysis of [Cp*IrCl2]2 and BH3·thf. On the other hand, the corresponding rhodium system afforded 10- and 11-vertices clusters [5-(Cp*Rh)B9H13)], 7, and [(Cp*Rh)2B9H9], 9, respectively. Clusters 1 and 2 are topological isomers. The geometry of 1 is dodecahedral, similar to that of its parent borane [B8H8](2-), in which two of the [BH] vertices are replaced by two [Cp*Ir] fragments. The geometry of 2 can be derived from a nine-vertex tricapped trigonal prism by removing one of the capped vertices. Compounds 4 and 5 are 10-vertex isocloso clusters based on a 10-vertex bicapped square antiprism structure. The only difference between them is the presence of a metal-metal bond in 5. The solid-state structures of 8 and 9 attain an 11-vertex geometry in which a unique six-membered B6H6 moiety is bonded to the metal center. In addition, quantum-chemical calculations have been used to provide further insight into the electronic structure and stability of the clusters. All the compounds have been characterized by IR and (1)H, (11)B, and (13)C NMR spectroscopy in solution, and the solid-state structures were established by X-ray crystallographic analysis.
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Affiliation(s)
- Dipak Kumar Roy
- Department of Chemistry, Indian Institute of Technology Madras , Chennai 600036, India
| | - Rosmita Borthakur
- Department of Chemistry, Indian Institute of Technology Madras , Chennai 600036, India
| | - Rini Prakash
- Department of Chemistry, Indian Institute of Technology Madras , Chennai 600036, India
| | - Somnath Bhattacharya
- Department of Chemistry, Indian Institute of Technology Madras , Chennai 600036, India
| | - Rajamony Jagan
- Department of Chemistry, Indian Institute of Technology Madras , Chennai 600036, India
| | - Sundargopal Ghosh
- Department of Chemistry, Indian Institute of Technology Madras , Chennai 600036, India
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46
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Lafage M, Pujol A, Saffon-Merceron N, Mézailles N. BH3 Activation by Phosphorus-Stabilized Geminal Dianions: Synthesis of Ambiphilic Organoborane, DFT Studies, and Catalytic CO2 Reduction into Methanol Derivatives. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00587] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mathieu Lafage
- Laboratoire
Hétérochimie Fondamentale et Appliquée, CNRS, Université Paul Sabatier, 31062 Toulouse, France
| | - Anthony Pujol
- Laboratoire
Hétérochimie Fondamentale et Appliquée, CNRS, Université Paul Sabatier, 31062 Toulouse, France
| | - Nathalie Saffon-Merceron
- Institut
de Chimie de Toulouse ICT-FR2599, Université Paul Sabatier, 31062 Toulouse Cedex, France
| | - Nicolas Mézailles
- Laboratoire
Hétérochimie Fondamentale et Appliquée, CNRS, Université Paul Sabatier, 31062 Toulouse, France
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47
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Mondal B, Bhattacharyya M, Varghese B, Ghosh S. Hypo-electronic triple-decker sandwich complexes: synthesis and structural characterization of [(Cp*Mo)2{μ–η6:η6-B4H4E-Ru(CO)3}] (E = S, Se, Te or Ru(CO)3 and Cp* = η5-C5Me5). Dalton Trans 2016; 45:10999-1007. [DOI: 10.1039/c6dt01214k] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Electron-poor triple-decker complexes, [(Cp*Mo)2{μ–η6:η6-B4H4ERu(CO)3}] (E = S, Se, Te, Ru(CO)3) with hexagonal bridging ring composed of boron, ruthenium and chalcogen atoms.
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Affiliation(s)
- Bijan Mondal
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai
- India
| | | | - Babu Varghese
- Sophisticated Analytical Instruments Facility
- Indian Institute of Technology Madras
- Chennai 600 036
- India
| | - Sundargopal Ghosh
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai
- India
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48
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Vishnevskiy YV, Tikhonov DS, Reuter CG, Mitzel NW, Hnyk D, Holub J, Wann DA, Lane PD, Berger RJF, Hayes SA. Influence of Antipodally Coupled Iodine and Carbon Atoms on the Cage Structure of 9,12-I2-closo-1,2-C2B10H10: An Electron Diffraction and Computational Study. Inorg Chem 2015; 54:11868-74. [DOI: 10.1021/acs.inorgchem.5b02102] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Denis S. Tikhonov
- Universität Bielefeld, Universitätsstraße 25, D-33615 Bielefeld, Germany
- M. V. Lomonosov Moscow State University, Department of Physical Chemistry, GSP-1, 1-3 Leninskiye Gory, 119991 Moscow, Russian Federation
| | | | - Norbert W. Mitzel
- Universität Bielefeld, Universitätsstraße 25, D-33615 Bielefeld, Germany
| | - Drahomír Hnyk
- Institute of Inorganic Chemistry of the ASCR, v.v.i, CZ-250 68 Husinec-Řež, Czech Republic
| | - Josef Holub
- Institute of Inorganic Chemistry of the ASCR, v.v.i, CZ-250 68 Husinec-Řež, Czech Republic
| | - Derek A. Wann
- Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K
| | - Paul D. Lane
- Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K
| | - Raphael J. F. Berger
- Materialchemie, Paris-Lodron Universität Salzburg, Hellbrunner Straße 34, A-5020 Salzburg, Austria
| | - Stuart A. Hayes
- Universität Bielefeld, Universitätsstraße 25, D-33615 Bielefeld, Germany
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49
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Yuvaraj K, Roy DK, Mondal B, Varghese B, Ghosh S. Homometallic Cubane Clusters: Participation of Three-Coordinated Hydrogen in 60-Valence Electron Cubane Core. Inorg Chem 2015; 54:8673-8. [PMID: 26347293 DOI: 10.1021/acs.inorgchem.5b01298] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This work describes the synthesis, structural characterizations, and electronic structures of a series of novel homometallic cubane clusters [(Cp*Ru)2{Ru(CO)2}2BH(μ3-E)(μ-H)B(μ-H)3M], (2, M = Cp*Ru, E = CO; 3, M = Ru(Cp*Ru)2(μ-CO)3(μ-H)BH), E = BH), [(Cp*Ru)3(μ3-CO)(BH)3(μ3-H)3], 4, and [(Cp*Ru)2(μ3-CO){Ru(CO)3}2(BH)2(μ-H)B], 5 (Cp* = η(5)-C5Me5). These cubane clusters have been isolated from a thermally driven reaction of diruthenium analogue of pentaborane(9) [(Cp*RuH)2B3H7], 1, and [Ru3(CO)12]. Structural and spectroscopic studies revealed the existence of triply bridged hydrogen (μ3-H) atoms that participate as a vertex in the cubane core formation for compounds 2, 3, and 4. In addition, the crystal structure of these clusters clearly confirms the presence of an electron precise borane ligand (borylene fragment) which is triply bridged to the trimetallic units. Bonding of these novel complexes has been studied computationally by DFT methods, and the studies demonstrate that the cubane clusters 2 and 3 possess 60 cluster valence electrons (cves) with six metal-metal bonds. All the new compounds have been characterized in solution by mass spectrometry; IR; and (1)H, (11)B, and (13)C NMR studies, and the structural types were unequivocally established by crystallographic analysis of compounds 2-5.
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Affiliation(s)
- K Yuvaraj
- Department of Chemistry, Indian Institute of Technology Madras , Chennai 600 036, India
| | - Dipak Kumar Roy
- Department of Chemistry, Indian Institute of Technology Madras , Chennai 600 036, India
| | - Bijan Mondal
- Department of Chemistry, Indian Institute of Technology Madras , Chennai 600 036, India
| | - Babu Varghese
- Sophisticated Analytical Instruments Facility, Indian Institute of Technology Madras , Chennai 600 036, India
| | - Sundargopal Ghosh
- Department of Chemistry, Indian Institute of Technology Madras , Chennai 600 036, India
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Ramalakshmi R, Bhattacharyya M, Rao CE, Ghosh S. Synthesis, structure and chemistry of low-boron containing molybdaborane: Arachno -[Cp*Mo(CO) 2 B 3 H 8 ]. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2014.12.031] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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