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Chu YY, García Alejo A, Bud'ko SL, Boteju K, Patnaik S, Ellern A, Pérez García M, Sadow AD. Structure and Magnetic Properties of Homoleptic Trivalent Tris(alkyl)lanthanides. Inorg Chem 2023. [PMID: 37471624 DOI: 10.1021/acs.inorgchem.3c00435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/22/2023]
Abstract
Six new solvent-free, homoleptic paramagnetic tris(alkyl)lanthanides Ln{C(SiHMe2)3}3 (1Ln) and Ln{C(SiHMe2)2Ph}3 (2Ln) (Ln = Gd, Dy, and Er) were synthesized to investigate the magnetic properties of 4f organometallic compounds stabilized by secondary Ln↼H-Si and benzylic interactions. The unit cell of 1Gd contains one independent molecule (Z = 2), while 1Dy and 1Er crystallize with four independent isostructural molecules per unit cell (Z = 16). In all molecules, as in other 1Ln compounds, the three tris(dimethylsilyl)methyl ligands form a trigonal planar LnC3 core, and six secondary interactions involving Ln↼H-Si bonding in Ln{C(SiHMe2)3}3 form above and below the equatorial plane. Two and five crystallographically independent molecules of each 2Ln (2Gd, Z = 8; 2Dy, Z = 20) form with three π-coordinated phenyl groups in addition to either one or two secondary Ln↼H-Si interactions per molecule. The packing of these midseries organolanthanide compounds contrasts the single crystallographically unique molecules in previously reported La{C(SiHMe2)3}3 (1La, Z = 2, Z' = 1) and La{C(SiHMe2)2Ph}3 (2La, Z = 2, Z' = 1/3). 2La doped with 2Dy can adopt the crystallographic structure of 2La, which promotes magnetic properties, namely a higher χmT value at low temperatures as well as stronger magnetic anisotropy. The ac susceptibility data for 10% 2Dy doped into 2La suggests slow relaxation at low temperatures with a relaxation barrier of ∼45 K. The computed saturated magnetization of 1Er (M ≈ 4.5 μB) and 1Dy (M ≈ 6 μB) matches the experimental values, while the computed value for 2Dy better matches the value measured for 2Dy diluted in 2La (M ≈ 5 μB). Gas-phase calculations predict that the ground-state and first excited-state multiplet separations are larger for 1Er than 2Er, while the ordering for dysprosium is 1Dy > 2Dy.
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Affiliation(s)
- Yang-Yun Chu
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
- US DOE Ames National Laboratory, Iowa State University, 2416 Pammel Drive, Ames, Iowa 50011, United States
| | - Andrés García Alejo
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
- US DOE Ames National Laboratory, Iowa State University, 2416 Pammel Drive, Ames, Iowa 50011, United States
| | - Sergey L Bud'ko
- US DOE Ames National Laboratory, Iowa State University, 2416 Pammel Drive, Ames, Iowa 50011, United States
- Department of Physics and Astronomy, Iowa State University, Physics 0012, 2323 Osborn Drive, Ames, Iowa 50011, United States
| | - Kasuni Boteju
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
- US DOE Ames National Laboratory, Iowa State University, 2416 Pammel Drive, Ames, Iowa 50011, United States
| | - Smita Patnaik
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
- US DOE Ames National Laboratory, Iowa State University, 2416 Pammel Drive, Ames, Iowa 50011, United States
| | - Arkady Ellern
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Marilú Pérez García
- US DOE Ames National Laboratory, Iowa State University, 2416 Pammel Drive, Ames, Iowa 50011, United States
| | - Aaron D Sadow
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
- US DOE Ames National Laboratory, Iowa State University, 2416 Pammel Drive, Ames, Iowa 50011, United States
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Abstract
Metastable radicals exist in a steady-state equilibrium in solution with dimers, which can be either σ dimers or π dimers. Here, we show that steric hindrance at the para position causes julolidine-derived dicyanomethyl radicals to form σ dimers rather than π dimers, the opposite behavior as seen in other carbon-centered radicals, where steric hindrance typically favors pimerization. The change in dimerization mode can be attributed to weaker London dispersion forces and a decreased orbital overlap in the sterically hindered dicyanomethyl radical π dimers, while the bulky groups exert relatively little effect on the energy of the σ dimer.
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Affiliation(s)
- Rui Zhang
- Department of Chemistry, Iowa State University, 1651 Gilman Hall, Ames, Iowa 50010, United States
| | - Arkady Ellern
- Department of Chemistry, Iowa State University, 1651 Gilman Hall, Ames, Iowa 50010, United States
| | - Arthur H Winter
- Department of Chemistry, Iowa State University, 1651 Gilman Hall, Ames, Iowa 50010, United States
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Chu YY, Lolinco A, Eedugurala N, Ellern A, Windus TL, Sadow AD. Reversible Ligand Protonation in Noninnocent Constrained-Geometry-Like Group 4 Complexes. Organometallics 2022. [DOI: 10.1021/acs.organomet.1c00612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yang-Yun Chu
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
- Ames Laboratory, 2416 Pammel Drive, Spedding Hall Dock, Ames, Iowa 50011, United States
| | - Annabelle Lolinco
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
- Ames Laboratory, 2416 Pammel Drive, Spedding Hall Dock, Ames, Iowa 50011, United States
| | - Naresh Eedugurala
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
- Ames Laboratory, 2416 Pammel Drive, Spedding Hall Dock, Ames, Iowa 50011, United States
| | - Arkady Ellern
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Theresa L. Windus
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
- Ames Laboratory, 2416 Pammel Drive, Spedding Hall Dock, Ames, Iowa 50011, United States
| | - Aaron D. Sadow
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
- Ames Laboratory, 2416 Pammel Drive, Spedding Hall Dock, Ames, Iowa 50011, United States
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4
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Sigalov M, Mazor R, Ellern A, Larina N, Lokshin V, Khodorkovsky V. Conjugated donor–acceptor substituted systems involving the 1,3-indandione-derived electron accepting moieties. RSC Adv 2022; 12:27766-27774. [PMID: 36320240 PMCID: PMC9516947 DOI: 10.1039/d2ra05335g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Accepted: 09/21/2022] [Indexed: 11/30/2022] Open
Abstract
Conjugated donor–acceptor molecules are the focus of research owing to their unusual photo- and electro-physical properties. At the same time, several unusual features of these compounds are difficult to explain or predict. Here we present our results on the synthesis, X-ray structures and D-NMR spectra providing a deeper insight into the conjugation within the derivatives involving the 1,3-indandione-derived series of compounds with varying electron acceptor strength and conjugating bridge length. The X-ray structures show the presence of several intermolecular short contacts strongly affecting the molecular geometries. In solution, the coalescence temperatures corresponding to the rotation of the phenylamino moiety of all derivatives do not exceed 246 K indicating the unhindered rotation at room temperature. Using B3LYP/aug-cc-pVDZ, the calculated model chemistry barriers to rotation, dipole moments and first hyperpolarizabilities are within experimental error. We conclude that neglecting the electron donating properties of bridges themselves and internal rotation about the single bonds taking part in conjugation can result, for instance, in misinterpretation of their room temperature NMR spectra and overestimation of the computed molecular dipole moments by more than 5 D. Determination of barriers to rotation using the D-NMR technique within a series of push–pull derivatives sheds light on the inability of stronger acceptors to considerably increase the dipole moments and nonlinear optical response.![]()
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Affiliation(s)
- Mark Sigalov
- Dept. of Chemistry, Ben-Gurion Univ. of the Negev, Beer-Sheva, 84105, Israel
| | - Royi Mazor
- Dept. of Chemistry, Ben-Gurion Univ. of the Negev, Beer-Sheva, 84105, Israel
| | - Arkady Ellern
- Chemistry Department, Iowa State University, 1711, Ames, IA, 50011, USA
| | - Nina Larina
- Aix Marseille Université, CNRS, CINaM UMR 7325, 13288, Marseille, France
| | - Vladimir Lokshin
- Aix Marseille Université, CNRS, CINaM UMR 7325, 13288, Marseille, France
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Zhang R, Ellern A, Winter AH. Anti-Aromaticity Relief as an Approach to Stabilize Free Radicals. Angew Chem Int Ed Engl 2021; 60:25082-25088. [PMID: 34528379 DOI: 10.1002/anie.202110870] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 09/06/2021] [Indexed: 11/07/2022]
Abstract
A new strategy to stabilize free radicals electronically is described by conjugating formally antiaromatic substituents to the free radical. With an antiaromatic substituent, the radical acts as an electron sink to allow configuration mixing of a low-energy zwitterionic state that provides antiaromaticity relief to the substituent. A combination of X-ray crystallography, VT-EPR and VT-UV/Vis spectroscopy, as well as computational analysis, was used to investigate this phenomenon. We find that this strategy of antiaromaticity relief is successful at stabilizing radicals, but only if the antiaromatic substituent is constrained to be planar by synthetically imposed conformational restraints that enable state mixing. This work leads to the counterintuitive finding that increasing the antiaromaticity of the radical substituent leads to greater radical stability, providing proof of concept for a new stereoelectronic approach for stabilizing free radicals.
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Affiliation(s)
- Rui Zhang
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, IA, 50010, USA
| | - Arkady Ellern
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, IA, 50010, USA
| | - Arthur H Winter
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, IA, 50010, USA
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6
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Affiliation(s)
- Rui Zhang
- Department of Chemistry Iowa State University 1605 Gilman Hall Ames IA 50010 USA
| | - Arkady Ellern
- Department of Chemistry Iowa State University 1605 Gilman Hall Ames IA 50010 USA
| | - Arthur H. Winter
- Department of Chemistry Iowa State University 1605 Gilman Hall Ames IA 50010 USA
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7
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Patnaik S, Kanbur U, Ellern A, Sadow AD. Hydrosilane σ-Adduct Intermediates in an Adaptive Zinc-Catalyzed Cross-dehydrocoupling of Si-H and O-H Bonds. Chemistry 2021; 27:10428-10436. [PMID: 33876468 PMCID: PMC8362191 DOI: 10.1002/chem.202101146] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Indexed: 11/09/2022]
Abstract
Three-coordinate Ph BOXMe 2 ZnR (Ph BOXMe 2 =phenyl-(4,4-dimethyl-oxazolinato; R=Me: 2 a, Et: 2 b) catalyzes the dehydrocoupling of primary or secondary silanes and alcohols to give silyl ethers and hydrogen, with high turnover numbers (TON; up to 107 ) under solvent-free conditions. Primary and secondary silanes react with small, medium, and large alcohols to give various degrees of substitution, from mono- to tri-alkoxylation, whereas tri-substituted silanes do not react with MeOH under these conditions. The effect of coordinative unsaturation on the behavior of the Zn catalyst is revealed through a dramatic variation of both rate law and experimental rate constants, which depend on the concentrations of both the alcohol and hydrosilane reactants. That is, the catalyst adapts its mechanism to access the most facile and efficient conversion. In particular, either alcohol or hydrosilane binds to the open coordination site on the Ph BOXMe 2 ZnOR catalyst to form a Ph BOXMe 2 ZnOR(HOR) complex under one set of conditions or an unprecedented σ-adduct Ph BOXMe 2 ZnOR(H-SiR'3 ) under other conditions. Saturation kinetics provide evidence for the latter species, in support of the hypothesis that σ-bond metathesis reactions involving four-centered electrocyclic 2σ-2σ transition states are preceded by σ-adducts.
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Affiliation(s)
- Smita Patnaik
- Department of ChemistryIowa State UniversityAmesIA 50011USA
- US Department of Energy Ames LaboratoryIowa State UniversityAmesIA 50011USA
| | - Uddhav Kanbur
- Department of ChemistryIowa State UniversityAmesIA 50011USA
- US Department of Energy Ames LaboratoryIowa State UniversityAmesIA 50011USA
| | - Arkady Ellern
- Department of ChemistryIowa State UniversityAmesIA 50011USA
| | - Aaron D. Sadow
- Department of ChemistryIowa State UniversityAmesIA 50011USA
- US Department of Energy Ames LaboratoryIowa State UniversityAmesIA 50011USA
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Boteju KC, Venkatesh A, Chu YY, Wan S, Ellern A, Rossini AJ, Sadow AD. Ancillary Steric Effects on the Activation of SiH Bonds in Arylsilazido Rare-Earth Compounds. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00162] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kasuni C. Boteju
- US Department of Energy Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Amrit Venkatesh
- US Department of Energy Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Yang-Yun Chu
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Suchen Wan
- US Department of Energy Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States
| | - Arkady Ellern
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Aaron J. Rossini
- US Department of Energy Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Aaron D. Sadow
- US Department of Energy Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
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9
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Eedugurala N, Wang Z, Kanbur U, Ellern A, Pruski M, Sadow AD. Synthesis and Characterization of Tris(oxazolinyl)borato Copper(II) and Copper(I) Complexes. Helv Chim Acta 2021. [DOI: 10.1002/hlca.202000209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Naresh Eedugurala
- Department of Chemistry Iowa State University 1605 Gilman Hall Ames IA 50011 United States
- U.S. Department of Energy Ames Laboratory 2416 Pammel Drive Iowa State University Ames IA 50011 United States
| | - Zhuoran Wang
- Department of Chemistry Iowa State University 1605 Gilman Hall Ames IA 50011 United States
- U.S. Department of Energy Ames Laboratory 2416 Pammel Drive Iowa State University Ames IA 50011 United States
| | - Uddhav Kanbur
- Department of Chemistry Iowa State University 1605 Gilman Hall Ames IA 50011 United States
- U.S. Department of Energy Ames Laboratory 2416 Pammel Drive Iowa State University Ames IA 50011 United States
| | - Arkady Ellern
- Department of Chemistry Iowa State University 1605 Gilman Hall Ames IA 50011 United States
| | - Marek Pruski
- Department of Chemistry Iowa State University 1605 Gilman Hall Ames IA 50011 United States
- U.S. Department of Energy Ames Laboratory 2416 Pammel Drive Iowa State University Ames IA 50011 United States
| | - Aaron D. Sadow
- Department of Chemistry Iowa State University 1605 Gilman Hall Ames IA 50011 United States
- U.S. Department of Energy Ames Laboratory 2416 Pammel Drive Iowa State University Ames IA 50011 United States
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Akbar Khandar A, Sheykhi A, Amini M, Ellern A, Keith Woo L. Synthesis, characterization and catalytic properties of a new binuclear copper(II) complex in the azide–alkyne cycloaddition. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114698] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Mesbahi E, Bagherzadeh M, Amini M, Akbari A, Ellern A, Woo LK. A novel binuclear iron(III)-salicylaldazine complex; synthesis, X-ray structure and catalytic activity in sulfide oxidation. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114531] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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Peterson JP, Ellern A, Winter AH. Spin Delocalization, Polarization, and London Dispersion Forces Govern the Formation of Diradical Pimers. J Am Chem Soc 2020; 142:5304-5313. [DOI: 10.1021/jacs.0c00190] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Joshua P. Peterson
- Department of Chemistry, Iowa State University, 1608 Gilman Hall, Ames, Iowa 50010, United States
| | - Arkady Ellern
- Department of Chemistry, Iowa State University, 1608 Gilman Hall, Ames, Iowa 50010, United States
| | - Arthur H. Winter
- Department of Chemistry, Iowa State University, 1608 Gilman Hall, Ames, Iowa 50010, United States
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13
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Norris S, Warner CC, Thooft AM, Demirci SK, Lampkin BJ, Miner K, Ellern A, VanVeller B. Blue-Light Photocleavable Protecting Groups Based on Benzothiadiazole Scaffolds. Org Lett 2019; 22:270-273. [DOI: 10.1021/acs.orglett.9b04268] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sean Norris
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Caroline C. Warner
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Andrea M. Thooft
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Selin K. Demirci
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Bryan J. Lampkin
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Kyle Miner
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Arkady Ellern
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Brett VanVeller
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
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14
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Reinig RR, Ellern A, Sadow AD. Heteroleptic Four-Coordinate Tris(oxazolinyl)borato Iron(II) Compounds. Inorg Chem 2019; 58:6044-6051. [DOI: 10.1021/acs.inorgchem.9b00359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Regina R. Reinig
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
- U.S. DOE Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States
| | - Arkady Ellern
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Aaron D. Sadow
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
- U.S. DOE Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States
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Abstract
The rhodium dicarbonyl {PhB(OxMe2)2ImMes}Rh(CO)2 (1) and primary silanes react by oxidative addition of a nonpolar Si-H bond and, uniquely, a thermal dissociation of CO. These reactions are reversible, and kinetic measurements model the approach to equilibrium. Thus, 1 and RSiH3 react by oxidative addition at room temperature in the dark, even in CO-saturated solutions. The oxidative addition reaction is first-order in both 1 and RSiH3, with rate constants for oxidative addition of PhSiH3 and PhSiD3 revealing kH/ kD ∼ 1. The reverse reaction, reductive elimination of Si-H from {PhB(OxMe2)2ImMes}RhH(SiH2R)CO (2), is also first-order in [2] and depends on [CO]. The equilibrium concentrations, determined over a 30 °C temperature range, provide Δ H ° = -5.5 ± 0.2 kcal/mol and Δ S ° = -16 ± 1 cal·mol-1K-1 (for 1 ⇄ 2). The rate laws and activation parameters for oxidative addition (Δ H⧧ = 11 ± 1 kcal·mol-1 and Δ S⧧ = -26 ± 3 cal·mol-1·K-1) and reductive elimination (Δ H⧧ = 17 ± 1 kcal·mol-1 and Δ S⧧ = -10 ± 3 cal·mol-1K-1), particularly the negative activation entropy for both forward and reverse reactions, suggest the transition state of the rate-determining step contains {PhB(OxMe2)2ImMes}Rh(CO)2 and RSiH3. Comparison of a series of primary silanes reveals that oxidative addition of arylsilanes is ca. 5× faster than alkylsilanes, whereas reductive elimination of Rh-Si/Rh-H from alkylsilyl and arylsilyl rhodium(III) occurs with similar rate constants. Thus, the equilibrium constant Ke for oxidative addition of arylsilanes is >1, whereas reductive elimination is favored for alkylsilanes.
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Affiliation(s)
- Abhranil Biswas
- Department of Chemistry , Iowa State University , 1605 Gilman Hall, 2415 Osborn Drive , Ames , Iowa 50011 , United States.,United States Department of Energy Ames Laboratory , Iowa State University , Ames , Iowa 50011 , United States
| | - Arkady Ellern
- United States Department of Energy Ames Laboratory , Iowa State University , Ames , Iowa 50011 , United States
| | - Aaron D Sadow
- Department of Chemistry , Iowa State University , 1605 Gilman Hall, 2415 Osborn Drive , Ames , Iowa 50011 , United States.,United States Department of Energy Ames Laboratory , Iowa State University , Ames , Iowa 50011 , United States
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16
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Schmidt BM, Pindwal A, Venkatesh A, Ellern A, Rossini AJ, Sadow AD. Zwitterionic Trivalent (Alkyl)lanthanide Complexes in Ziegler-Type Butadiene Polymerization. ACS Catal 2018. [DOI: 10.1021/acscatal.8b04025] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Bradley M. Schmidt
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Aradhana Pindwal
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Amrit Venkatesh
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Arkady Ellern
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Aaron J. Rossini
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Aaron D. Sadow
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
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17
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Schmidt BM, Ho HA, Basemann K, Ellern A, Windus TL, Sadow AD. Redox Chemistry of Bis(oxazolinyl)cyclopentadienyl and -fluorenyl Rhodium and Iridium Organometallic Compounds. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00626] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bradley M. Schmidt
- Department of Chemistry, Iowa State University, 1605 Gilman
Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Hung-An Ho
- Department of Chemistry, Iowa State University, 1605 Gilman
Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Kevin Basemann
- Department of Chemistry, Iowa State University, 1605 Gilman
Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Arkady Ellern
- Department of Chemistry, Iowa State University, 1605 Gilman
Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Theresa L. Windus
- Department of Chemistry, Iowa State University, 1605 Gilman
Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Aaron D. Sadow
- Department of Chemistry, Iowa State University, 1605 Gilman
Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
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18
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Zhang R, Peterson JP, Fischer LJ, Ellern A, Winter AH. Effect of Structure on the Spin–Spin Interactions of Tethered Dicyanomethyl Diradicals. J Am Chem Soc 2018; 140:14308-14313. [DOI: 10.1021/jacs.8b08628] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rui Zhang
- Department of Chemistry, Iowa State University, 1608 Gilman Hall, Ames, Iowa 50010, United States
| | - Joshua P. Peterson
- Department of Chemistry, Iowa State University, 1608 Gilman Hall, Ames, Iowa 50010, United States
| | - Logan J. Fischer
- Department of Chemistry, Iowa State University, 1608 Gilman Hall, Ames, Iowa 50010, United States
| | - Arkady Ellern
- Department of Chemistry, Iowa State University, 1608 Gilman Hall, Ames, Iowa 50010, United States
| | - Arthur H. Winter
- Department of Chemistry, Iowa State University, 1608 Gilman Hall, Ames, Iowa 50010, United States
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19
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Reinig RR, Fought EL, Ellern A, Windus TL, Sadow AD. Cobalt(ii) acyl intermediates in carbon-carbon bond formation and oxygenation. Dalton Trans 2018; 47:12147-12161. [PMID: 30090898 DOI: 10.1039/c8dt02661k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The organocobalt scorpionate compounds ToMCoR (ToM = tris(4,4-dimethyl-2-oxazolinyl)phenylborate; R = Bn, 1; CH2SiMe3, 2; Ph, 3; Et, 4; nBu, 5; Me, 6) react in carbonylation, oxidation, and carboxylation reactions via pathways that are distinctly influenced by the nature of the organometallic moiety. The compounds are prepared by reaction of ToMCoCl with the corresponding organolithium or organopotassium reagents. Compounds 1-6 were characterized by 8-line hyperfine coupling to cobalt in EPR spectra and solution phase magnetic measurements (μeff = 4-5μB) as containing a high-spin cobalt(ii) center. The UV-Vis spectra revealed an intense diagnostic band at ca. 700 nm (ε > 1000 M-1 cm-1) associated with the tetrahedral organocobalt(ii) center that was assigned to a d ← d transition on the basis of configuration interaction (CI) calculations. Complexes 1-6 react rapidly with CO to form equilibrating mixtures of the low spin organocobalt carbonyl ToMCo(R)CO, acyl ToMCoC([double bond, length as m-dash]O)R, and acyl carbonyl ToMCo{C([double bond, length as m-dash]O)R}CO. The 1H and 11B NMR spectra contained only one set of signals for the CO-treated solutions, whereas the solution-phase IR spectra contained up to two νCO and three νC([double bond, length as m-dash]O)R signals with intensities varying depending on the R group (R = Bn, 7; CH2SiMe3, 8; Ph, 9; Et, 10; nBu, 11; Me, 12). Single crystal X-ray diffraction of ToMCo{C([double bond, length as m-dash]O)Et}CO (10) supports its assignment as a square pyramidal cobalt(ii) acyl carbonyl complex. Upon evaporation of volatiles, solutions of 8-12 revert to the CO-free organocobalt starting materials 2-6, whereas attempts to isolate benzyl-derived 7 provide an unusual α-alkoxyketone species, characterized by single crystal X-ray diffraction. Despite the differences observed in the carbonylation of 1-6 as a result of varying the R group, compounds 7-12 all react rapidly with O2 through an oxygenation pathway to afford the corresponding carboxylate compounds ToMCoO2CR (R = Bn, 13; CH2SiMe3, 14; Ph, 15; Et, 16; nBu, 17; Me, 18). In contrast, the insertion of CO2 into the Co-C bond in 1-6 requires several days to weeks.
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Affiliation(s)
- Regina R Reinig
- US Department of Energy Ames Laboratory and Department of Chemistry, 1605 Gilman Hall, Iowa State University, Ames, IA 50011, USA.
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20
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Ellern A. Scope and limitations on refinement strategy. A service crystallographer's publishing woes. Acta Crystallogr A Found Adv 2018. [DOI: 10.1107/s2053273318090800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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21
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Affiliation(s)
- Uddhav Kanbur
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Arkady Ellern
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Aaron D. Sadow
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
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22
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Nguyen YH, Lampkin BJ, Venkatesh A, Ellern A, Rossini AJ, VanVeller B. Open-Resonance-Assisted Hydrogen Bonds and Competing Quasiaromaticity. J Org Chem 2018; 83:9850-9857. [PMID: 30024169 DOI: 10.1021/acs.joc.8b01331] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The delocalization of electron density upon tautomerization of a proton across a conjugated bridge can alter the strength of hydrogen bonds. This effect has been dubbed resonance-assisted hydrogen bonding (RAHB) and plays a major role in the energetics of the tautomeric equilibrium. The goal of this work was to investigate the role that π-delocalization plays in the stability of RAHBs by engaging other isomerization processes. Similarly, acid-base chemistry has received little experimental attention in studies of RAHB, and we address the role that acid-base effects play in the tautomeric equilibrium. We find that π-delocalization and the disruption of adjacent aromatic rings is the dominant effect in determining the stability of a RAHB.
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Affiliation(s)
- Yen H Nguyen
- Department of Chemistry , Iowa State University , Ame , Iowa 50011 , United States
| | - Bryan J Lampkin
- Department of Chemistry , Iowa State University , Ame , Iowa 50011 , United States
| | - Amrit Venkatesh
- Department of Chemistry , Iowa State University , Ame , Iowa 50011 , United States
| | - Arkady Ellern
- Department of Chemistry , Iowa State University , Ame , Iowa 50011 , United States
| | - Aaron J Rossini
- Department of Chemistry , Iowa State University , Ame , Iowa 50011 , United States
| | - Brett VanVeller
- Department of Chemistry , Iowa State University , Ame , Iowa 50011 , United States
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23
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Boteju KC, Wan S, Venkatesh A, Ellern A, Rossini AJ, Sadow AD. Rare earth arylsilazido compounds with inequivalent secondary interactions. Chem Commun (Camb) 2018; 54:7318-7321. [PMID: 29904755 DOI: 10.1039/c8cc03186j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new bulky silazido ligand, -N(SiHMe2)Dipp (Dipp = C6H3-2,6-iPr2), supports planar, three-coordinate homoleptic rare earth complexes Ln{N(SiHMe2)Dipp}3 (Ln = Sc, Y, and Lu), each containing three secondary Ln↼HSi interactions and one agostic CH bond. Y{N(SiHMe2)Dipp}3 and acetophenone react via hydrosilylation, rather than by insertion into the Y-N bond or by enolate formation.
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Affiliation(s)
- Kasuni C Boteju
- Department of Chemistry and US DOE Ames Laboratory, 1605 Gilman Hall, Iowa State University, Ames, IA 50011, USA.
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24
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Amini M, Khaksar M, Ellern A, Keith Woo L. A new nanocluster polyoxomolybdate [Mo36O110(NO)4(H2O)14]·52H2O: Synthesis, characterization and application in oxidative degradation of common organic dyes. Chin J Chem Eng 2018. [DOI: 10.1016/j.cjche.2017.03.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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25
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Pindwal A, Yan K, Patnaik S, Schmidt BM, Ellern A, Slowing II, Bae C, Sadow AD. Homoleptic Trivalent Tris(alkyl) Rare Earth Compounds. J Am Chem Soc 2017; 139:16862-16874. [PMID: 28991458 DOI: 10.1021/jacs.7b09521] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Homoleptic tris(alkyl) rare earth complexes Ln{C(SiHMe2)3}3 (Ln = La, 1a; Ce, 1b; Pr, 1c; Nd, 1d) are synthesized in high yield from LnI3THFn and 3 equiv of KC(SiHMe2)3. X-ray diffraction studies reveal 1a-d are isostructural, pseudo-C3-symmetric molecules that contain two secondary Ln↼HSi interactions per alkyl ligand (six total). Spectroscopic assignments are supported by comparison with Ln{C(SiDMe2)3}3 and DFT calculations. The Ln↼HSi and terminal SiH exchange rapidly on the NMR time scale at room temperature, but the two motifs are resolved at low temperature. Variable-temperature NMR studies provide activation parameters for the exchange process in 1a (ΔH⧧ = 8.2(4) kcal·mol-1; ΔS⧧ = -1(2) cal·mol-1K-1) and 1a-d9 (ΔH⧧ = 7.7(3) kcal·mol-1; ΔS⧧ = -4(2) cal·mol-1K-1). Comparisons of lineshapes, rate constants (kH/kD), and slopes of ln(k/T) vs 1/T plots for 1a and 1a-d9 reveal that an inverse isotope effect dominates at low temperature. DFT calculations identify four low-energy intermediates containing five β-Si-H⇀Ln and one γ-C-H⇀Ln. The calculations also suggest the pathway for Ln↼HSi/SiH exchange involves rotation of a single C(SiHMe2)3 ligand that is coordinated to the Ln center through the Ln-C bond and one secondary interaction. These robust organometallic compounds persist in solution and in the solid state up to 80 °C, providing potential for their use in a range of synthetic applications. For example, reactions of Ln{C(SiHMe2)3}3 and ancillary proligands, such as bis-1,1-(4,4-dimethyl-2-oxazolinyl)ethane (HMeC(OxMe2)2) give {MeC(OxMe2)2}Ln{C(SiHMe2)3}2, and reactions with disilazanes provide solvent-free lanthanoid tris(disilazides).
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Affiliation(s)
- Aradhana Pindwal
- U.S. DOE Ames Laboratory, Iowa State University , Ames, Iowa 50011, United States.,Department of Chemistry, Iowa State University , 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - KaKing Yan
- U.S. DOE Ames Laboratory, Iowa State University , Ames, Iowa 50011, United States.,Department of Chemistry, Iowa State University , 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Smita Patnaik
- U.S. DOE Ames Laboratory, Iowa State University , Ames, Iowa 50011, United States.,Department of Chemistry, Iowa State University , 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Bradley M Schmidt
- U.S. DOE Ames Laboratory, Iowa State University , Ames, Iowa 50011, United States.,Department of Chemistry, Iowa State University , 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Arkady Ellern
- Department of Chemistry, Iowa State University , 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Igor I Slowing
- U.S. DOE Ames Laboratory, Iowa State University , Ames, Iowa 50011, United States.,Department of Chemistry, Iowa State University , 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Cheolbeom Bae
- Kumho Petrochemical R&D Center , Daejeon 34044, Republic of Korea
| | - Aaron D Sadow
- U.S. DOE Ames Laboratory, Iowa State University , Ames, Iowa 50011, United States.,Department of Chemistry, Iowa State University , 1605 Gilman Hall, Ames, Iowa 50011, United States
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26
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Reinig RR, Fought EL, Ellern A, Windus TL, Sadow AD. Rapid and ordered carbonylation and oxygenation of a cobalt(ii) methyl. Chem Commun (Camb) 2017; 53:11020-11023. [PMID: 28936508 DOI: 10.1039/c7cc06339c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The oxidative carbonylation of ToMCoMe (1; ToM = tris(4,4-dimethyl-2-oxazolinyl)phenylborate) involves its rapid, reversible reaction with CO to form ToMCo{C(O)Me}CO (2) followed by rapid reaction with O2 yielding ToMCoOAc (3), in contrast to the slow direct carboxylation of ToMCoMe by CO2.
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Affiliation(s)
- Regina R Reinig
- Department of Chemistry, 1605 Gilman Hall, Iowa State University, Ames, IA 50011, USA.
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27
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Kadam AA, Ellern A, Stanley LM. Enantioselective, Palladium-Catalyzed Conjugate Additions of Arylboronic Acids to Form Bis-benzylic Quaternary Stereocenters. Org Lett 2017; 19:4062-4065. [DOI: 10.1021/acs.orglett.7b01825] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Abhishek A. Kadam
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Arkady Ellern
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Levi M. Stanley
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
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28
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Affiliation(s)
- Nicole L. Lampland
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Aradhana Pindwal
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - KaKing Yan
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Arkady Ellern
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Aaron D. Sadow
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
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29
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Eedugurala N, Wang Z, Yan K, Boteju KC, Chaudhary U, Kobayashi T, Ellern A, Slowing II, Pruski M, Sadow AD. β-SiH-Containing Tris(silazido) Rare-Earth Complexes as Homogeneous and Grafted Single-Site Catalyst Precursors for Hydroamination. Organometallics 2017. [DOI: 10.1021/acs.organomet.6b00956] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Naresh Eedugurala
- Department of Chemistry and
U.S. Department of Energy Ames Laboratory, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Zhuoran Wang
- Department of Chemistry and
U.S. Department of Energy Ames Laboratory, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - KaKing Yan
- Department of Chemistry and
U.S. Department of Energy Ames Laboratory, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Kasuni C. Boteju
- Department of Chemistry and
U.S. Department of Energy Ames Laboratory, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Umesh Chaudhary
- Department of Chemistry and
U.S. Department of Energy Ames Laboratory, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Takeshi Kobayashi
- Department of Chemistry and
U.S. Department of Energy Ames Laboratory, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Arkady Ellern
- Department of Chemistry and
U.S. Department of Energy Ames Laboratory, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Igor I. Slowing
- Department of Chemistry and
U.S. Department of Energy Ames Laboratory, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Marek Pruski
- Department of Chemistry and
U.S. Department of Energy Ames Laboratory, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Aaron D. Sadow
- Department of Chemistry and
U.S. Department of Energy Ames Laboratory, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
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30
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Pindwal A, Patnaik S, Everett WC, Ellern A, Windus TL, Sadow AD. Cerium-Catalyzed Hydrosilylation of Acrylates to Give α-Silyl Esters. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201610263] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Aradhana Pindwal
- Department of Chemistry and Center for Catalysis; Iowa State University; 1605 Gilman Hall Ames IA 50011 USA
| | - Smita Patnaik
- Department of Chemistry and Center for Catalysis; Iowa State University; 1605 Gilman Hall Ames IA 50011 USA
| | - William C. Everett
- Department of Chemistry and Center for Catalysis; Iowa State University; 1605 Gilman Hall Ames IA 50011 USA
| | - Arkady Ellern
- Department of Chemistry and Center for Catalysis; Iowa State University; 1605 Gilman Hall Ames IA 50011 USA
| | - Theresa L. Windus
- Department of Chemistry and Center for Catalysis; Iowa State University; 1605 Gilman Hall Ames IA 50011 USA
| | - Aaron D. Sadow
- Department of Chemistry and Center for Catalysis; Iowa State University; 1605 Gilman Hall Ames IA 50011 USA
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31
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Abstract
A β-SiH functionalized benzyl anion [C(SiHMe2)2Ph]− reacts with early rare earth halides to provide homoleptic tris(alkyl)lanthanides containing secondary interactions in an efficient and high yielding route.
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Affiliation(s)
- Kasuni C. Boteju
- Department of Chemistry and US DOE Ames Laboratory
- Iowa State University
- Ames IA 50011
- USA
| | - Arkady Ellern
- Department of Chemistry and US DOE Ames Laboratory
- Iowa State University
- Ames IA 50011
- USA
| | - Aaron D. Sadow
- Department of Chemistry and US DOE Ames Laboratory
- Iowa State University
- Ames IA 50011
- USA
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32
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Pindwal A, Patnaik S, Everett WC, Ellern A, Windus TL, Sadow AD. Cerium-Catalyzed Hydrosilylation of Acrylates to Give α-Silyl Esters. Angew Chem Int Ed Engl 2016; 56:628-631. [PMID: 27900844 DOI: 10.1002/anie.201610263] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Indexed: 11/07/2022]
Abstract
The homoleptic organocerium complex Ce{C(SiHMe2 )3 }3 (1) reacts with B(C6 F5 )3 to produce the zwitterionic bis(alkyl) hydridoborato Ce{C(SiHMe2 )3 }2 HB(C6 F5 )3 (2). NMR and IR spectroscopy and X-ray crystallography indicate that each alkyl ligand contains two bridging Ce↼H-Si interactions in both 1 and 2. Compound 2 serves as a precatalyst for the hydrosilylation of acrylates to give α-silyl esters at room temperature with a turnover number of 2200.
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Affiliation(s)
- Aradhana Pindwal
- Department of Chemistry and Center for Catalysis, Iowa State University, 1605 Gilman Hall, Ames, IA, 50011, USA
| | - Smita Patnaik
- Department of Chemistry and Center for Catalysis, Iowa State University, 1605 Gilman Hall, Ames, IA, 50011, USA
| | - William C Everett
- Department of Chemistry and Center for Catalysis, Iowa State University, 1605 Gilman Hall, Ames, IA, 50011, USA
| | - Arkady Ellern
- Department of Chemistry and Center for Catalysis, Iowa State University, 1605 Gilman Hall, Ames, IA, 50011, USA
| | - Theresa L Windus
- Department of Chemistry and Center for Catalysis, Iowa State University, 1605 Gilman Hall, Ames, IA, 50011, USA
| | - Aaron D Sadow
- Department of Chemistry and Center for Catalysis, Iowa State University, 1605 Gilman Hall, Ames, IA, 50011, USA
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Johnson KF, Schneider EA, Schumacher BP, Ellern A, Scanlon JD, Stanley LM. Rhodium-Catalyzed Enantioselective Intramolecular Hydroacylation of Trisubstituted Alkenes. Chemistry 2016; 22:15619-15623. [DOI: 10.1002/chem.201603880] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2016] [Indexed: 01/26/2023]
Affiliation(s)
| | | | - Brian P. Schumacher
- Department of Chemistry; Ripon College; Ripon WI 54971 USA
- Department of Chemistry; Iowa State University; Ames IA 50010 USA
| | - Arkady Ellern
- Department of Chemistry; Iowa State University; Ames IA 50010 USA
| | | | - Levi M. Stanley
- Department of Chemistry; Iowa State University; Ames IA 50010 USA
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Bagherzadeh M, Mousavi NA, Zare M, Jamali S, Ellern A, Woo LK. ONO pincer type binuclear Pd(II) complex: Synthesis, crystal structure and catalytic utilization of the resulting organopalladium complex in catalytic copper-free Sonogashira coupling reaction. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.07.032] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Affiliation(s)
- Aradhana Pindwal
- Department
of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Arkady Ellern
- Department
of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Aaron D. Sadow
- Department
of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
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Reinig RR, Mukherjee D, Weinstein ZB, Xie W, Albright T, Baird B, Gray TS, Ellern A, Miller GJ, Winter AH, Bud'ko SL, Sadow AD. Synthesis and Oxidation Catalysis of [Tris(oxazolinyl)borato]cobalt(II) Scorpionates. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600237] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Regina R. Reinig
- Department of ChemistryIowa State University1605 Gilman Hall50011AmesIAUSA
- US Department of Energy Ames Lab50011AmesIAUSA
| | | | - Zachary B. Weinstein
- Department of ChemistryIowa State University1605 Gilman Hall50011AmesIAUSA
- US Department of Energy Ames Lab50011AmesIAUSA
| | - Weiwei Xie
- Department of ChemistryIowa State University1605 Gilman Hall50011AmesIAUSA
- US Department of Energy Ames Lab50011AmesIAUSA
| | - Toshia Albright
- Department of ChemistryIowa State University1605 Gilman Hall50011AmesIAUSA
| | - Benjamin Baird
- Department of ChemistryIowa State University1605 Gilman Hall50011AmesIAUSA
| | - Tristan S. Gray
- Department of ChemistryIowa State University1605 Gilman Hall50011AmesIAUSA
| | - Arkady Ellern
- Department of ChemistryIowa State University1605 Gilman Hall50011AmesIAUSA
| | - Gordon J. Miller
- Department of ChemistryIowa State University1605 Gilman Hall50011AmesIAUSA
- US Department of Energy Ames Lab50011AmesIAUSA
| | - Arthur H. Winter
- Department of ChemistryIowa State University1605 Gilman Hall50011AmesIAUSA
| | | | - Aaron D. Sadow
- Department of ChemistryIowa State University1605 Gilman Hall50011AmesIAUSA
- US Department of Energy Ames Lab50011AmesIAUSA
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37
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Ghosh A, Walker JA, Ellern A, Stanley LM. Coupling Catalytic Alkene Hydroacylation and α-Arylation: Enantioselective Synthesis of Heterocyclic Ketones with α-Chiral Quaternary Stereocenters. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00365] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Avipsa Ghosh
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - James A. Walker
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Arkady Ellern
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Levi M. Stanley
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
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38
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Amini M, Bayrami A, Marashi MN, Arab A, Ellern A, Woo LK. Synthesis, structure, and catalytic properties of copper, palladium and cobalt complexes containing an N,O-type bidentate thiazoline ligand. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2015.12.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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39
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Bekere L, Larina N, Lokshin V, Ellern A, Sigalov M, Khodorkovsky V. A new class of spirocyclic photochromes reacting with light of both UV and visible ranges. NEW J CHEM 2016. [DOI: 10.1039/c6nj00666c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Deep coloration of weakly colored spirocyclic derivatives (R = NMe2, NEt2, and OMe) can be achieved by irradiation with light of any wavelength between 254 and 642 nm.
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Affiliation(s)
- Laura Bekere
- Aix Marseille Université
- CNRS
- CINaM UMR 7325
- Marseille
- France
| | - Nina Larina
- Aix Marseille Université
- CNRS
- CINaM UMR 7325
- Marseille
- France
| | | | | | - Mark Sigalov
- Department of Chemistry
- Ben Gurion University of the Negev
- Beer Sheva
- Israel
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40
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Schmitz S, van Leusen J, Ellern A, Kögerler P, Monakhov KY. Thioether-terminated nickel(ii) coordination clusters with {Ni6} horseshoe- and {Ni8} rollercoaster-shaped cores. Inorg Chem Front 2016. [DOI: 10.1039/c5qi00278h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report two polynuclear nickel(ii) compounds whose supramolecular structures are controlled by small inorganic templating anions and π-conjugated Schiff-base ligands (L·SMe3− and HL·SMe2−) with peripheral, structurally exposed methylthioether groups.
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Affiliation(s)
- Sebastian Schmitz
- Institut für Anorganische Chemie
- RWTH Aachen University
- 52074 Aachen
- Germany
| | - Jan van Leusen
- Institut für Anorganische Chemie
- RWTH Aachen University
- 52074 Aachen
- Germany
| | | | - Paul Kögerler
- Institut für Anorganische Chemie
- RWTH Aachen University
- 52074 Aachen
- Germany
- Jülich-Aachen Research Alliance (JARA-FIT) and Peter Grünberg Institute (PGI-6)
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41
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Lampland NL, Pindwal A, Neal SR, Schlauderaff S, Ellern A, Sadow AD. Magnesium-catalyzed hydrosilylation of α,β-unsaturated esters. Chem Sci 2015; 6:6901-6907. [PMID: 29861929 PMCID: PMC5947512 DOI: 10.1039/c5sc02435h] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Accepted: 08/20/2015] [Indexed: 11/21/2022] Open
Abstract
ToMMgHB(C6F5)3 (1, ToM = tris(4,4-dimethyl-2-oxazolinyl)phenylborate) catalyzes the 1,4-hydrosilylation of α,β-unsaturated esters. This magnesium hydridoborate compound is synthesized by the reaction of ToMMgMe, PhSiH3, and B(C6F5)3. Unlike the transient ToMMgH formed from the reaction of ToMMgMe and PhSiH3, the borate adduct 1 persists in solution and in the solid state. Crystallographic characterization reveals tripodal coordination of the HB(C6F5)3 moiety to the six-coordinate magnesium center with a ∠Mg-H-B of 141(3)°. The pathway for formation of 1 is proposed to involve the reaction of ToMMgMe and a PhSiH3/B(C6F5)3 adduct because the other possible intermediates, ToMMgH and ToMMgMeB(C6F5)3, react to give an intractable black solid and ToMMgC6F5, respectively. Under catalytic conditions, silyl ketene acetals are isolated in high yield from the addition of hydrosilanes to α,β-unsaturated esters with 1 as the catalyst.
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Affiliation(s)
- Nicole L Lampland
- Department of Chemistry , Iowa State University , 1605 Gilman Hall , Ames , IA 50011 , USA .
| | - Aradhana Pindwal
- Department of Chemistry , Iowa State University , 1605 Gilman Hall , Ames , IA 50011 , USA .
| | - Steven R Neal
- Department of Chemistry , University of Tennessee , 515 Dabney-Buehler Hall, 1420 Circle Dr. , Knoxville , TN 37996 , USA
| | - Shealyn Schlauderaff
- Department of Chemistry , Iowa State University , 1605 Gilman Hall , Ames , IA 50011 , USA .
| | - Arkady Ellern
- Department of Chemistry , Iowa State University , 1605 Gilman Hall , Ames , IA 50011 , USA .
| | - Aaron D Sadow
- Department of Chemistry , Iowa State University , 1605 Gilman Hall , Ames , IA 50011 , USA .
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42
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Eedugurala N, Hovey M, Ho HA, Jana B, Lampland NL, Ellern A, Sadow AD. Cyclopentadienyl-bis(oxazoline) Magnesium and Zirconium Complexes in Aminoalkene Hydroaminations. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00771] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Naresh Eedugurala
- U.S. DOE
Ames Laboratory
and Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011-3111, United States
| | - Megan Hovey
- U.S. DOE
Ames Laboratory
and Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011-3111, United States
| | - Hung-An Ho
- U.S. DOE
Ames Laboratory
and Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011-3111, United States
| | - Barun Jana
- U.S. DOE
Ames Laboratory
and Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011-3111, United States
| | - Nicole L. Lampland
- U.S. DOE
Ames Laboratory
and Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011-3111, United States
| | - Arkady Ellern
- U.S. DOE
Ames Laboratory
and Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011-3111, United States
| | - Aaron D. Sadow
- U.S. DOE
Ames Laboratory
and Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011-3111, United States
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43
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Amini M, Khaksar M, Arab A, Jahandizi RM, Bagherzadeh M, Boghaei DM, Ellern A, Keith Woo L. Catalytic behavior of an iron(III) complex containing an N,O-type bidentate oxazoline ligand for selective oxidation of sulfides. TRANSIT METAL CHEM 2015. [DOI: 10.1007/s11243-015-0001-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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44
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Xu S, Magoon Y, Reinig RR, Schmidt BM, Ellern A, Sadow AD. Organometallic Complexes of Bulky, Optically Active, C3-Symmetric Tris(4S-isopropyl-5,5-dimethyl-2-oxazolinyl)phenylborate (ToP*). Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00225] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Songchen Xu
- Department
of Chemistry, 1605 Gilman Hall, Iowa State University, Ames, Iowa 50011, United States
| | - Yitzhak Magoon
- Department
of Chemistry, 1605 Gilman Hall, Iowa State University, Ames, Iowa 50011, United States
| | - Regina R. Reinig
- Department
of Chemistry, 1605 Gilman Hall, Iowa State University, Ames, Iowa 50011, United States
| | - Bradley M. Schmidt
- Department
of Chemistry, 1605 Gilman Hall, Iowa State University, Ames, Iowa 50011, United States
| | - Arkady Ellern
- Department
of Chemistry, 1605 Gilman Hall, Iowa State University, Ames, Iowa 50011, United States
| | - Aaron D. Sadow
- Department
of Chemistry, 1605 Gilman Hall, Iowa State University, Ames, Iowa 50011, United States
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45
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Lampland NL, Zhu J, Hovey M, Jana B, Ellern A, Sadow AD. Piano-Stool Lutetium Amido and Imido Compounds Supported by a Constrained Bis(oxazoline)cyclopentadienyl Ligand. Inorg Chem 2015; 54:6938-46. [DOI: 10.1021/acs.inorgchem.5b00927] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nicole L. Lampland
- Department
of Chemistry and US Department of Energy Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States
| | - Jing Zhu
- Department
of Chemistry and US Department of Energy Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States
| | - Megan Hovey
- Department
of Chemistry and US Department of Energy Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States
| | - Barun Jana
- Department
of Chemistry and US Department of Energy Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States
| | - Arkady Ellern
- Department
of Chemistry and US Department of Energy Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States
| | - Aaron D. Sadow
- Department
of Chemistry and US Department of Energy Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States
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46
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Baca SG, Speldrich M, van Leusen J, Ellern A, Kögerler P. Undecametallic and hexadecametallic ferric oxo-hydroxo/ethoxo pivalate clusters. Dalton Trans 2015; 44:7777-80. [PMID: 25847453 DOI: 10.1039/c5dt00665a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis strategies for highly condensed {Fe11} and {Fe16} pivalate clusters have been developed based on archetypal geometrically frustrated triangular {Fe3(μ3-O)} motifs that are interlinked via oxo, hydroxo, ethoxo, and carboxylate groups.
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Affiliation(s)
- Svetlana G Baca
- Institute of Inorganic Chemistry, RWTH Aachen University, Aachen, Germany.
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47
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Yu. Monakhov K, Linnenberg O, Kozłowski P, van Leusen J, Besson C, Secker T, Ellern A, López X, Poblet JM, Kögerler P. Back Cover: Supramolecular Recognition Influences Magnetism in [X@HV IV
8
V V
14
O 54
] 6−
Self-Assemblies with Symmetry-Breaking Guest Anions (Chem. Eur. J. 6/2015). Chemistry 2015. [DOI: 10.1002/chem.201590024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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48
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Schmitz S, van Leusen J, Ellern A, Kögerler P, Monakhov KY. A thioether-decorated {Mn11Tb4} coordination cluster with slow magnetic relaxation. Inorg Chem Front 2015. [DOI: 10.1039/c5qi00172b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A {MnIII11TbIII4}-nuclearity coordination complex with structurally exposed thioether functional groups and antiferromagnetic intramolecular coupling interactions was synthesised and characterised by temperature- and field-dependent magnetic susceptibility measurements.
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Affiliation(s)
- Sebastian Schmitz
- Institut für Anorganische Chemie
- RWTH Aachen University
- 52074 Aachen
- Germany
| | - Jan van Leusen
- Institut für Anorganische Chemie
- RWTH Aachen University
- 52074 Aachen
- Germany
| | | | - Paul Kögerler
- Institut für Anorganische Chemie
- RWTH Aachen University
- 52074 Aachen
- Germany
- Jülich-Aachen Research Alliance (JARA-FIT) and Peter Grünberg Institute (PGI-6)
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49
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Hull EA, West AC, Pestovsky O, Kristian KE, Ellern A, Dunne JF, Carraher JM, Bakac A, Windus TL. UV-visible spectroscopy of macrocyclic alkyl, nitrosyl and halide complexes of cobalt and rhodium. Experiment and calculation. Dalton Trans 2015; 44:3811-6. [DOI: 10.1039/c4dt03143a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Visible light photolysis of Co(NH3)5CH32+ generates alkyl radicals, unlike the halide complexes Co(NH3)5X2+ which produce halogen anions, X−.
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Affiliation(s)
- Emily A. Hull
- Department of Chemistry and Ames Laboratory
- Iowa State University
- Ames
- USA
| | - Aaron C. West
- Department of Chemistry and Ames Laboratory
- Iowa State University
- Ames
- USA
| | - Oleg Pestovsky
- Department of Chemistry and Ames Laboratory
- Iowa State University
- Ames
- USA
| | | | - Arkady Ellern
- Department of Chemistry and Ames Laboratory
- Iowa State University
- Ames
- USA
| | - James F. Dunne
- Department of Chemistry and Ames Laboratory
- Iowa State University
- Ames
- USA
| | - Jack M. Carraher
- Department of Chemistry and Ames Laboratory
- Iowa State University
- Ames
- USA
| | - Andreja Bakac
- Department of Chemistry and Ames Laboratory
- Iowa State University
- Ames
- USA
| | - Theresa L. Windus
- Department of Chemistry and Ames Laboratory
- Iowa State University
- Ames
- USA
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50
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Bhuwalka A, Mike JF, Intemann JJ, Ellern A, Jeffries-EL M. A versatile and efficient synthesis of bithiophene-based dicarboxaldehydes from a common synthon. Org Biomol Chem 2015; 13:9462-70. [DOI: 10.1039/c5ob01135c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The efficient synthesis of several bithiophene dialdehydes from a common intermediate is reported.
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