1
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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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2
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Sun R, Deng WH, Yu B, Lu Y, Zhai X, Liao RZ, Tung CH, Wang W. Hydroboration of the (C 5Me 5)Fe(1,2-Ph 2PC 6H 4) System To Derive Hydridoborate and Hydridosilicate Complexes. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rui Sun
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Wen-Hao Deng
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Boying Yu
- College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Yilei Lu
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Xiaofang Zhai
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Rong-Zhen Liao
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Chen-Ho Tung
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Wenguang Wang
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
- College of Chemistry, Beijing Normal University, Beijing 100875, China
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3
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Pathak K, Gayen S, Saha S, Nandi C, Mishra S, Ghosh S. Coordination and Hydroboration of Ru(II)‐Borate Complexes: Dihydridoborate vs. Bis(dihydridoborate). Chemistry 2022; 28:e202104393. [DOI: 10.1002/chem.202104393] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Indexed: 11/12/2022]
Affiliation(s)
- Kriti Pathak
- Department of Chemistry Indian Institute of Technology, Madras Chennai 600036 India
| | - Sourav Gayen
- Department of Chemistry Indian Institute of Technology, Madras Chennai 600036 India
| | - Suvam Saha
- Department of Chemistry Indian Institute of Technology, Madras Chennai 600036 India
| | - Chandan Nandi
- Department of Chemistry Indian Institute of Technology, Madras Chennai 600036 India
| | - Shivankan Mishra
- 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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4
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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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5
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Amason EK, Rajabimoghadam K, Baughman NN, Ghareeb CR, Bourgeois SK, Keuk C, Manacsa G, Popp BV, Garcia-Bosch I, Ferrence GM, Joslin EE. Synthesis and Reactivity of Ampy-Based Ruthenium(II) Catalysts for Transfer Hydrogenation of Ketones. Organometallics 2022. [DOI: 10.1021/acs.organomet.1c00444] [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]
Affiliation(s)
- Edith K. Amason
- Department of Chemistry, The University of the South, Sewanee, Tennessee 22903, United States
| | | | - Notashia N. Baughman
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26505, United States
| | - C. Roland Ghareeb
- Department of Chemistry, The University of the South, Sewanee, Tennessee 22903, United States
| | - Samantha K. Bourgeois
- Department of Chemistry, The University of the South, Sewanee, Tennessee 22903, United States
| | - Channita Keuk
- Department of Chemistry, The University of the South, Sewanee, Tennessee 22903, United States
| | - Gayle Manacsa
- Department of Chemistry, The University of the South, Sewanee, Tennessee 22903, United States
| | - Brian V. Popp
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26505, United States
| | - Isaac Garcia-Bosch
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Gregory M. Ferrence
- Department of Chemistry, Illinois State University, Normal, Illinois 61790, United States
| | - Evan E. Joslin
- Department of Chemistry, The University of the South, Sewanee, Tennessee 22903, United States
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6
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Kar S, Kar K, Bairagi S, Bhattacharyya M, Chowdhury MG, Ghosh S. Chalcogen stabilized borate complexes of tantalum. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2021.120685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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7
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Zafar M, Ahmad A, Saha S, Ramalakshmi R, Roisnel T, Ghosh S. Cooperative B-H bond activation: Dual sites borane activation by redox active κ 2-N,S-chelated complexes. Chem Sci 2022; 13:8567-8575. [PMID: 35974760 PMCID: PMC9337726 DOI: 10.1039/d2sc00907b] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2022] [Accepted: 06/22/2022] [Indexed: 11/21/2022] Open
Abstract
Cooperative dual site activation of boranes by redox-active 1,3-N,S-chelated ruthenium species, mer-[PR3{κ2-N,S-(L)}2Ru{κ1-S-(L)}], (mer-2a: R = Cy, mer-2b: R = Ph; L = NC7H4S2), generated from the aerial oxidation of borate complexes, [PR3{κ2-N,S-(L)}Ru{κ3-H,S,S′-BH2(L)2}] (trans–mer-1a: R = Cy, trans–mer-1b: R = Ph; L = NC7H4S2), has been investigated. Utilizing the rich electronic behaviour of these 1,3-N,S-chelated ruthenium species, we have established that a combination of redox-active ligands and metal–ligand cooperativity has a big influence on the multisite borane activation. For example, treatment of mer-2a–b with BH3·THF led to the isolation of fac-[PR3Ru{κ3-H,S,S′-(NH2BSBH2N)(S2C7H4)2}] (fac-3a: R = Cy and fac-3b: R = Ph) that captured boranes at both sites of the κ2-N,S-chelated ruthenacycles. The core structure of fac-3a and fac-3b consists of two five-membered ruthenacycles [RuBNCS] which are fused by one butterfly moiety [RuB2S]. Analogous fac-3c, [PPh3Ru{κ3-H,S,S′-(NH2BSBH2N)(SC5H4)2}], can also be synthesized from the reaction of BH3·THF with [PPh3{κ2-N,S-(SNC5H4)}{κ3-H,S,S′-BH2(SNH4C5)2}Ru], cis–fac-1c. In stark contrast, when mer-2b was treated with BH2Mes (Mes = 2,4,6-trimethyl phenyl) it led to the formation of trans- and cis-bis(dihydroborate) complexes [{κ3-S,H,H-(NH2BMes)Ru(S2C7H4)}2], (trans-4 and cis-4). Both the complexes have two five-membered [Ru–(H)2–B–NCS] ruthenacycles with κ2-H–H coordination modes. Density functional theory (DFT) calculations suggest that the activation of boranes across the dual Ru–N site is more facile than the Ru–S one. Redox-active ruthenium complexes supported by hemilabile κ2-N,S-chelated ruthenacycles undergo unusual dual site B–H bond activation through metal–ligand cooperation with free and bulky boranes.![]()
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Affiliation(s)
- Mohammad Zafar
- Department of Chemistry, Indian Institute of Technology Madras Chennai 600036 India
| | - Asif Ahmad
- Department of Chemistry, Indian Institute of Technology Madras Chennai 600036 India
| | - Suvam 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
| | - Thierry Roisnel
- Univ of 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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8
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Galiana-Cameo M, Urriolabeitia A, Barrenas E, Passarelli V, Pérez-Torrente JJ, Di Giuseppe A, Polo V, Castarlenas R. Metal–Ligand Cooperative Proton Transfer as an Efficient Trigger for Rhodium-NHC-Pyridonato Catalyzed gem-Specific Alkyne Dimerization. ACS Catal 2021. [DOI: 10.1021/acscatal.1c00602] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- María Galiana-Cameo
- Departamento de Química Inorgánica−Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Universidad de Zaragoza−CSIC, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Asier Urriolabeitia
- Departamento de Química Física, Universidad de Zaragoza, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Eduardo Barrenas
- Departamento de Química Inorgánica−Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Universidad de Zaragoza−CSIC, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Vincenzo Passarelli
- Departamento de Química Inorgánica−Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Universidad de Zaragoza−CSIC, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
- Centro Universitario de la Defensa, Ctra Huesca S/N, 50090 Zaragoza, Spain
| | - Jesús J. Pérez-Torrente
- Departamento de Química Inorgánica−Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Universidad de Zaragoza−CSIC, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Andrea Di Giuseppe
- Departamento de Química Inorgánica−Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Universidad de Zaragoza−CSIC, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
- Dipartimento di Scienze Fisiche e Chimiche, Università dell’Aquila, via Vetoio, I-67100 Coppito (AQ), Italy
| | - Víctor Polo
- Departamento de Química Física, Universidad de Zaragoza, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Ricardo Castarlenas
- Departamento de Química Inorgánica−Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Universidad de Zaragoza−CSIC, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
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9
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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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10
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Saha K, Roy DK, Dewhurst RD, Ghosh S, Braunschweig H. Recent Advances in the Synthesis and Reactivity of Transition Metal σ-Borane/Borate Complexes. Acc Chem Res 2021; 54:1260-1273. [PMID: 33565872 DOI: 10.1021/acs.accounts.0c00819] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The coordination of an element-element σ bond to a transition metal (TM) is both a fundamentally intriguing binding mode and of critical importance to metal-mediated bond activation mechanisms and catalysis, particularly the hotly contested field of C-H activation. TM σ complexes of dihydrogen (i.e., H-H) and silanes (H-SiR3) have been extensively studied, the latter being of interest as models for the (generally unstable and unisolable) σ complexes of alkanes (i.e., H-CR3). TM σ complexes of hydroboranes and hydroborates (i.e., H-BR2, H-BR3, (H-)2BR2) are somewhat less well studied but similarly have relevance to catalytic borylation reactions that are of high current interest to organic synthesis. Our two research groups have made significant contributions to elaborating the family of σ-borane/-borate complexes using two distinct approaches: while the Ghosh group generally starts from hydrogen-rich tetracoordinate boron species such as borates, the Braunschweig group starts from hypovalent and/or hypocoordinate boron building blocks. Through these two approaches, a wide range of species containing one or two σ-bound B-H ligands have been prepared, some with additional chelating donor sites. Over the past 2 years, the body of work on σ-borane/-borate complexes from our two research groups has significantly expanded, with a combined nine published articles in 2019-2020 alone. Very recent work from the Braunschweig group has led to the synthesis of the first bis(σ)-borane complexes of group 6 metals, as well as the synthesis of a series of novel bis(σ)-borane and bis(σ)-borate complexes of ruthenium and iridium, the former being useful precursors for pentacoordinate borylene complexes of Ru. Recent work from the Ghosh group has uncovered a remarkable diversity of structures with σ(B-H)-bound ligands from the combination of borohydrides and nitrogen/chalcogen-containing groups and heterocycles. These reactions, while in some cases producing conventional scorpionate-type chelating products, more frequently undergo fascinating rearrangements with unpredictable outcomes. This Account aims to highlight this recent acceleration of research progress in this area, particularly the distinct but related approaches of-and complexes produced by-our two research groups, in addition to relevant works from other groups where appropriate.
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Affiliation(s)
- Koushik Saha
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Dipak Kumar Roy
- Department of Chemistry, Indian Institute of Technology Indore, Indore 453552, India
| | - Rian D. Dewhurst
- 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
| | - Sundargopal Ghosh
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - 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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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: 13] [Impact Index Per Article: 4.3] [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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12
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Joseph B, Gomosta S, Prakash R, Roisnel T, Phukan AK, Ghosh S. Chalcogen Stabilized bis‐Hydridoborate Complexes of Cobalt: Analogues of Tetracyclo[4.3.0.0
2,4
.0
3,5
]nonane. Chemistry 2020; 26:16824-16832. [DOI: 10.1002/chem.202003152] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Indexed: 11/05/2022]
Affiliation(s)
- Benson Joseph
- Department of Chemistry Indian Institute of Technology Madras Chennai 600036 India
| | - Suman Gomosta
- Department of Chemistry Indian Institute of Technology Madras Chennai 600036 India
| | - Rini Prakash
- Department of Chemistry Indian Institute of Technology Madras Chennai 600036 India
| | - Thierry Roisnel
- Institut des Sciences Chimiques de Rennes Université de Rennes, CNRS UMR 6226 35000 Rennes France
| | - Ashwini K. Phukan
- Department of Chemical Sciences Tezpur University Napaam 784028 Assam India
| | - Sundargopal Ghosh
- Department of Chemistry Indian Institute of Technology Madras Chennai 600036 India
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