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Abstract
Crystallization from a 20-year-old commercial source of 3-ethyl-4-methyl-3-pyrrolin-2-one afforded 1:1 co-crystals of this compound (C7H11NO) with its oxidized derivative, 3-ethyl-4-methyl-3-pyrroline-2,5-dione (C7H9NO2). The compound crystallizes in the space group P\overline{1}, with two molecules of each species in the asymmetric unit. These four molecules form a hydrogen-bonded tetramer with a dimer of 3-ethyl-4-methyl-3-pyrrolin-2-one as the core flanked by one molecule of the dione on each side.
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2
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Lazzara NC, Rosano RJ, Vagadia PP, Giovine MT, Bezpalko MW, Piro NA, Kassel WS, Boyko WJ, Zubris DL, Schrader KK, Wedge DE, Duke SO, Giuliano RM. Synthesis and Biological Evaluation of 6-[(1R)-1-Hydroxyethyl]-2,4a(R),6(S),8a(R)-tetrahydropyrano-[3,2-b]-pyran-2-one and Structural Analogues of the Putative Structure of Diplopyrone. J Org Chem 2018; 84:666-678. [DOI: 10.1021/acs.joc.8b02490] [Citation(s) in RCA: 7] [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)
- Nicholas C. Lazzara
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Robert J. Rosano
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Purav P. Vagadia
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Matthew T. Giovine
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Mark W. Bezpalko
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Nicholas A. Piro
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Wm. Scott Kassel
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Walter J. Boyko
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Deanna L. Zubris
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Kevin K. Schrader
- Natural Products Utilization Research Unit, Agricultural Research Service, U.S. Department of Agriculture, P.O. Box 1848, University, Mississippi 38677, United States
| | - David E. Wedge
- Natural Products Utilization Research Unit, Agricultural Research Service, U.S. Department of Agriculture, P.O. Box 1848, University, Mississippi 38677, United States
| | - Stephen O. Duke
- Natural Products Utilization Research Unit, Agricultural Research Service, U.S. Department of Agriculture, P.O. Box 1848, University, Mississippi 38677, United States
| | - Robert M. Giuliano
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
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3
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Allen JE, Kassel WS, Piro NA. Synthesis, structures and characterization of complexes containing a 2,6-bis(guanidinyl)pyridine ligand on iron(II), cobalt(II), nickel(II), copper(I), copper(II) and zinc(II). Polyhedron 2018. [DOI: 10.1016/j.poly.2018.08.012] [Citation(s) in RCA: 4] [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: 01/21/2023]
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4
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Wilson HH, Koellner CA, Hannan ZM, Endy CB, Bezpalko MW, Piro NA, Kassel WS, Sonntag MD, Graves CR. Synthesis and Characterization of Neutral Ligand α-Diimine Complexes of Aluminum with Tunable Redox Energetics. Inorg Chem 2018; 57:9622-9633. [PMID: 29553256 DOI: 10.1021/acs.inorgchem.8b00045] [Citation(s) in RCA: 6] [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: 11/30/2022]
Abstract
The synthesis and full characterization of a series of neutral ligand α-diimine complexes of aluminum are reported. The compounds [Al(LAr)2Cl2)][AlCl4] [LAr = N, N'-bis(4-R-C6H4)-2,3-dimethyl-1,4-diazabutadiene] are structurally analogous, as determined by multinuclear NMR spectroscopy and solid-state X-ray diffraction, across a range of electron-donating [R = Me (2), tBu (3), OMe (4), and NMe2 (5)] and electron-withdrawing [R = Cl (6), CF3 (7), and NO2 (8)] substituents in the aryl side arm of the ligand. UV-vis absorption spectroscopy and electrochemistry were used to access the optical and electrochemical properties, respectively, of the complexes. Both sets of properties are shown to be dependent on the R substituent. Density functional theory calculations performed on the [Al(LPh)2Cl2)][AlCl4] complex (1) indicate primarily ligand-based frontier orbitals and were used to help support our discussion of both the spectral and electrochemical data. We also report the reaction of the LPh ligand with both AlBr3 and AlI3 and demonstrate a different reactivity profile for the heavier halide relative to the lighter members of the group.
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Affiliation(s)
- Henry H Wilson
- Department of Chemistry and Biochemistry , Swarthmore College , 500 College Avenue , Swarthmore , Pennsylvania 19081 , United States
| | - Connor A Koellner
- Department of Chemistry and Biochemistry , Albright College , 13th and Bern Streets , Reading , Pennsylvania 19612 , United States
| | - Zain M Hannan
- Department of Chemistry and Biochemistry , Swarthmore College , 500 College Avenue , Swarthmore , Pennsylvania 19081 , United States
| | - Caroline B Endy
- Department of Chemistry and Biochemistry , Albright College , 13th and Bern Streets , Reading , Pennsylvania 19612 , United States
| | - Mark W Bezpalko
- Department of Chemistry , Villanova University , 800 Lancaster Avenue , Villanova , Pennsylvania 19085 , United States
| | - Nicholas A Piro
- Department of Chemistry , Villanova University , 800 Lancaster Avenue , Villanova , Pennsylvania 19085 , United States
| | - W Scott Kassel
- Department of Chemistry , Villanova University , 800 Lancaster Avenue , Villanova , Pennsylvania 19085 , United States
| | - Matthew D Sonntag
- Department of Chemistry and Biochemistry , Albright College , 13th and Bern Streets , Reading , Pennsylvania 19612 , United States
| | - Christopher R Graves
- Department of Chemistry and Biochemistry , Swarthmore College , 500 College Avenue , Swarthmore , Pennsylvania 19081 , United States
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5
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Viere EJ, Kuhn AE, Roeder MH, Piro NA, Kassel WS, Dudley TJ, Paul JJ. Spectroelectrochemical studies of a ruthenium complex containing the pH sensitive 4,4'-dihydroxy-2,2'-bipyridine ligand. Dalton Trans 2018; 47:4149-4161. [PMID: 29473071 DOI: 10.1039/c7dt04554a] [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
Attaining high oxidation states at the metal center of transition metal complexes is a key design principle for many catalytic processes. One way to support high oxidation state chemistry is to utilize ligands that are electron-donating in nature. Understanding the structural and electronic changes of metal complexes as higher oxidation states are reached is critical towards designing more robust catalysts that are able to turn over at high rates without decomposing. To this end, we report herein the changes in structural and electronic properties as [Ru(bpy)2(44'bpy(OH)2)]2+ is oxidized to [Ru(bpy)2(44'bpy(OH)2)]3+ (bpy = 2,2'-bipyridine; 44'bpy(OH)2 = 4,4'-dihydroxy-2,2'-bipyridine). The 44'bpy(OH)2 ligand is a pH-dependent ligand where deprotonation of the hydroxyl groups leads to significant electronic donation to the metal center. A Pourbaix Diagram of the complex reveals a pH independent reduction potential below pH = 2.0 for the Ru3+/2+ process at 0.91 V vs. Ag/AgCl. Above pH = 2.0, pH dependence is observed with a decrease in reduction potential until pH = 6.8 where the complex is completely deprotonated, resulting in a reduction potential of 0.62 V vs. Ag/AgCl. Spectroelectrochemical studies as a function of pH reveal the disappearance of the Metal to Ligand Charge Transfer (MLCT) or Mixed Metal-Ligand to Charge Transfer bands upon oxidation and the appearance of a new low energy band. DFT calculations for this low energy band were carried out using both B3LYP and M06-L functionals for all protonation states and suggest that numerous new transition types occur upon oxidation to Ru3+.
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Affiliation(s)
- Erin J Viere
- Department of Chemistry, Villanova University, 800 Lancaster Ave., Villanova, PA 19085, USA..
| | - Ashley E Kuhn
- Department of Chemistry, Villanova University, 800 Lancaster Ave., Villanova, PA 19085, USA..
| | - Margaret H Roeder
- Department of Chemistry, Villanova University, 800 Lancaster Ave., Villanova, PA 19085, USA..
| | - Nicholas A Piro
- Department of Chemistry, Albright College, 1621 N. 13th Street, Reading, PA 19604, USA
| | - W Scott Kassel
- Department of Chemistry, Villanova University, 800 Lancaster Ave., Villanova, PA 19085, USA..
| | - Timothy J Dudley
- Math, Science and Technology Department, University of Minnesota Crookston, 2900 University Ave., Crookston, MN 56716, USA
| | - Jared J Paul
- Department of Chemistry, Villanova University, 800 Lancaster Ave., Villanova, PA 19085, USA..
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6
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Prokopchuk DE, Wiedner ES, Walter ED, Popescu CV, Piro NA, Kassel WS, Bullock RM, Mock MT. Catalytic N2 Reduction to Silylamines and Thermodynamics of N2 Binding at Square Planar Fe. J Am Chem Soc 2017; 139:9291-9301. [DOI: 10.1021/jacs.7b04552] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [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)
- Demyan E. Prokopchuk
- Center
for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box
999, Richland, Washington 99352, United States
| | - Eric S. Wiedner
- Center
for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box
999, Richland, Washington 99352, United States
| | - Eric D. Walter
- Environmental Molecular Sciences Laboratory, Richland, Washington 99352, United States
| | - Codrina V. Popescu
- Department
of Chemistry, Colgate University, 13 Oak Drive, Hamilton, New York 13346, United States
| | - Nicholas A. Piro
- Department
of Chemistry, Villanova University, 800 E. Lancaster Ave., Villanova, Pennsylvania 19085, United States
| | - W. Scott Kassel
- Department
of Chemistry, Villanova University, 800 E. Lancaster Ave., Villanova, Pennsylvania 19085, United States
| | - R. Morris Bullock
- Center
for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box
999, Richland, Washington 99352, United States
| | - Michael T. Mock
- Center
for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box
999, Richland, Washington 99352, United States
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7
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Qu F, Park S, Martinez K, Gray JL, Thowfeik FS, Lundeen JA, Kuhn AE, Charboneau DJ, Gerlach DL, Lockart MM, Law JA, Jernigan KL, Chambers N, Zeller M, Piro NA, Kassel WS, Schmehl RH, Paul JJ, Merino EJ, Kim Y, Papish ET. Ruthenium Complexes are pH-Activated Metallo Prodrugs (pHAMPs) with Light-Triggered Selective Toxicity Toward Cancer Cells. Inorg Chem 2017. [DOI: 10.1021/acs.inorgchem.7b01065] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Fengrui Qu
- Department
of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
| | - Seungjo Park
- Department
of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama 35487-0203, United States
| | - Kristina Martinez
- Department
of Chemistry, Tulane University, New Orleans, Louisiana 70118, United States
| | - Jessica L. Gray
- Department
of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
| | | | - John A. Lundeen
- Department
of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
| | - Ashley E. Kuhn
- Department
of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - David J. Charboneau
- Department
of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
- Department
of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Deidra L. Gerlach
- Department
of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
| | - Molly M. Lockart
- Department
of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
| | - James A. Law
- Department
of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
| | - Katherine L. Jernigan
- Department
of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
| | - Nicole Chambers
- Department
of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
| | - Matthias Zeller
- Department
of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Nicholas A. Piro
- Department
of Chemistry, Albright College, Reading, Pennsylvania 19612, United States
| | - W. Scott Kassel
- Department
of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Russell H. Schmehl
- Department
of Chemistry, Tulane University, New Orleans, Louisiana 70118, United States
| | - Jared J. Paul
- Department
of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Edward J. Merino
- Department
of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States
| | - Yonghyun Kim
- Department
of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama 35487-0203, United States
| | - Elizabeth T. Papish
- Department
of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
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8
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Bhattacharya P, Heiden ZM, Wiedner ES, Raugei S, Piro NA, Kassel WS, Bullock RM, Mock MT. Ammonia Oxidation by Abstraction of Three Hydrogen Atoms from a Mo–NH3 Complex. J Am Chem Soc 2017; 139:2916-2919. [DOI: 10.1021/jacs.7b00002] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [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)
- Papri Bhattacharya
- Center
for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
| | - Zachariah M. Heiden
- Department
of Chemistry, Washington State University, Pullman, Washington 99164, United States
| | - Eric S. Wiedner
- Center
for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
| | - Simone Raugei
- Center
for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
| | - Nicholas A. Piro
- Department
of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - W. Scott Kassel
- Department
of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - R. Morris Bullock
- Center
for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
| | - Michael T. Mock
- Center
for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
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9
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Hosseinpour S, Hosseini-Yazdi SA, White J, Scott Kassel W, Piro NA. X-ray crystal structural and spectral studies of copper(II) and nickel(II) complexes of two asymmetric bis(thiosemicarbazone) ligands and the investigation of relationship between the N(4)-substituent and the electrochemical behavior. Polyhedron 2017. [DOI: 10.1016/j.poly.2016.06.048] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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10
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Hartlaub SF, Lauricella NK, Ryczek CN, Furneaux AG, Melton JD, Piro NA, Kassel WS, Nataro C. Late Transition Metal Compounds with 1,1′‐Bis(phosphino)ferrocene Ligands. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201601099] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sage F. Hartlaub
- Department of Chemistry Lafayette CollegeHugel Science CenterLafayette College18042EastonPAUSA
| | - Nicole K. Lauricella
- Department of Chemistry Lafayette CollegeHugel Science CenterLafayette College18042EastonPAUSA
| | - Catherine N. Ryczek
- Department of Chemistry Lafayette CollegeHugel Science CenterLafayette College18042EastonPAUSA
| | - Aliza G. Furneaux
- Department of Chemistry Lafayette CollegeHugel Science CenterLafayette College18042EastonPAUSA
| | - Jon D. Melton
- Department of Chemistry and BiochemistryMessiah CollegeOne College Avenue17055MechanicsburgPAUSA
| | - Nicholas A. Piro
- Department of ChemistryVillanova University800 E. Lancaster Avenue19085VillanovaPAUSA
| | - W. S. Kassel
- Department of ChemistryVillanova University800 E. Lancaster Avenue19085VillanovaPAUSA
| | - Chip Nataro
- Department of Chemistry Lafayette CollegeHugel Science CenterLafayette College18042EastonPAUSA
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11
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Curran H, Zhang C, Piro NA, Kassel WS, Giuliano RM. Allyl 3,4,6-tri- O-acetyl-2-deoxy-2-phthalimido-β- D-glucopyranoside. IUCr Data 2016. [DOI: 10.1107/s2414314616013638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The protected glycoside of 2-amino-2-deoxyglucose (glucosamine), namely allyl 3,4,6-tri-O-acetyl-2-deoxy-2-phthalimido-β-D-glucopyranoside, C23H25NO10, was synthesized from the glycosyl bromide. Crystallographic analysis confirmed the β-anomeric configuration and showed an approximately orthogonal orientation of the phthalimido group with respect to the pyranose ring. The absolute configuration of the molecule was known from the synthetic route and assigned accordingly.
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12
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Charboneau DJ, Piro NA, Kassel WS, Dudley TJ, Paul JJ. Reprint of: Structural, electronic and acid/base properties of [Ru(bpy)(bpy(OH)2)2]2+ (bpy = 2,2′-bipyridine, bpy(OH)2= 4,4′-dihydroxy-2,2′-bipyridine). Polyhedron 2016. [DOI: 10.1016/j.poly.2016.05.042] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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13
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Warnick EP, Dupuis RJ, Piro NA, Scott Kassel W, Nataro C. Compounds containing weak, non-covalent interactions to the metal in the backbone of 1,1′-bis(phosphino)metallocene ligands. Polyhedron 2016. [DOI: 10.1016/j.poly.2015.11.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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14
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Martin DJ, McCarthy BD, Piro NA, Dempsey JL. Synthesis and electrochemical characterization of a tridentate Schiff-base ligated Fe(II) complex. Polyhedron 2016. [DOI: 10.1016/j.poly.2015.12.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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15
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Lense S, Piro NA, Kassel SW, Wildish A, Jeffery B. Crystal structures of fac-tri-carbonyl-chlorido-(6,6'-dihy-droxy-2,2'-bi-pyridine)-rhenium(I) tetra-hydro-furan monosolvate and fac-bromido-tricarbon-yl(6,6'-dihy-droxy-2,2'-bi-pyridine)-manganese(I) tetra-hydro-furan monosolvate. Acta Crystallogr E Crystallogr Commun 2016; 72:1201-5. [PMID: 27536414 PMCID: PMC4971873 DOI: 10.1107/s2056989016011841] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Accepted: 07/20/2016] [Indexed: 11/16/2022]
Abstract
The structures of two facially coordinated Group VII metal complexes, fac-[ReCl(6,6′-dihydroxy-2,2′-bipyridine)(CO)3]·C4H8O and fac-[MnBr(6,6′-dihydroxy-2,2′-bipyridine)(CO)3]·C4H8O, are reported. These complexes are relevant to catalysis for CO2 reduction. The structures of two facially coordinated Group VII metal complexes, fac-[ReCl(C10H8N2O2)(CO)3]·C4H8O (I·THF) and fac-[MnBr(C10H8N2O2)(CO)3]·C4H8O (II·THF), are reported. In both complexes, the metal ion is coordinated by three carbonyl ligands, a halide ligand, and a 6,6′-dihydroxy-2,2′-bipyridine ligand in a distorted octahedral geometry. Both complexes co-crystallize with a non-coordinating tetrahydrofuran (THF) solvent molecule and exhibit intermolecular but not intramolecular hydrogen bonding. In both crystal structures, chains of complexes are formed due to intermolecular hydrogen bonding between a hydroxy group from the 6,6′-dihydroxy-2,2′-bipyridine ligand and the halide ligand from a neighboring complex. The THF molecule is hydrogen bonded to the remaining hydroxy group.
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Affiliation(s)
- Sheri Lense
- University of Wisconsin Oshkosh, Department of Chemistry, 800 Algoma Blvd., Oshkosh, WI 54902, USA
| | - Nicholas A Piro
- Villanova University, Department of Chemistry, 800 E. Lancaster Avenue, Villanova, PA 19085, USA
| | - Scott W Kassel
- Villanova University, Department of Chemistry, 800 E. Lancaster Avenue, Villanova, PA 19085, USA
| | - Andrew Wildish
- University of Wisconsin Oshkosh, Department of Chemistry, 800 Algoma Blvd., Oshkosh, WI 54902, USA
| | - Brent Jeffery
- University of Wisconsin Oshkosh, Department of Chemistry, 800 Algoma Blvd., Oshkosh, WI 54902, USA
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16
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Egbert JD, Labios LA, Darmon JM, Piro NA, Scott Kassel W, Mock MT. Synthesis and Structure of Vanadium Halide Complexes Containing Diphosphine Ligands with Pendant Amines. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501477] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jonathan D. Egbert
- Center for Molecular Electrocatalysis, Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, USA, http://www.pnl.gov/science/staff/staff_info.asp?staff_num=7137
| | - Liezel A. Labios
- Center for Molecular Electrocatalysis, Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, USA, http://www.pnl.gov/science/staff/staff_info.asp?staff_num=7137
| | - Jonathan M. Darmon
- Center for Molecular Electrocatalysis, Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, USA, http://www.pnl.gov/science/staff/staff_info.asp?staff_num=7137
| | - Nicholas A. Piro
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, USA
| | - W. Scott Kassel
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, USA
| | - Michael T. Mock
- Center for Molecular Electrocatalysis, Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, USA, http://www.pnl.gov/science/staff/staff_info.asp?staff_num=7137
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17
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Blass BL, Hernández Sánchez R, Decker VA, Robinson MJ, Piro NA, Kassel WS, Diaconescu PL, Nataro C. Structural, Computational, and Spectroscopic Investigation of [Pd(κ3-1,1′-bis(di-tert-butylphosphino)ferrocenediyl)X]+ (X = Cl, Br, I) Compounds. Organometallics 2016. [DOI: 10.1021/acs.organomet.5b00889] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [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)
- Brittany L. Blass
- Department
of Chemistry, Lafayette College, Easton, Pennsylvania 18042, United States
| | - Raúl Hernández Sánchez
- Department
of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, .United States
| | - Victoria A. Decker
- Department
of Chemistry, Lafayette College, Easton, Pennsylvania 18042, United States
| | - Michael J. Robinson
- Department
of Chemistry, Lafayette College, Easton, Pennsylvania 18042, United States
| | - Nicholas A. Piro
- Department
of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - W. Scott Kassel
- Department
of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Paula L. Diaconescu
- Department
of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Chip Nataro
- Department
of Chemistry, Lafayette College, Easton, Pennsylvania 18042, United States
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18
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Furneaux AG, Piro NA, Hernández Sánchez R, Gramigna KM, Fey N, Robinson MJ, Kassel WS, Nataro C. Spectroscopic, structural and computational analysis of [Re(CO)3(dippM)Br]n+ (dippM = 1,1′-bis(diiso-propylphosphino)metallocene, M = Fe, n = 0 or 1; M = Co, n = 1). Dalton Trans 2016; 45:4819-27. [DOI: 10.1039/c5dt04721h] [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
[Re(CO)3(dippf)Br]+: the first structurally characterized complex of a coordinated bis(phosphino)ferrocenium ligand.
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Affiliation(s)
| | | | | | | | - Natalie Fey
- School of Chemistry
- University of Bristol
- Bristol BS8 1TS
- UK
| | | | | | - Chip Nataro
- Department of Chemistry
- Lafayette College
- Easton
- USA
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19
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Egbert JD, O'Hagan M, Wiedner ES, Bullock RM, Piro NA, Kassel WS, Mock MT. Putting chromium on the map for N2 reduction: production of hydrazine and ammonia. A study of cis-M(N2)2 (M = Cr, Mo, W) bis(diphosphine) complexes. Chem Commun (Camb) 2016; 52:9343-6. [DOI: 10.1039/c6cc03449g] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [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
Protonolysis experiments show of the Group 6 N2 complexes, only Cr affords N2H5+ and NH4+ from reduction of the N2 ligands.
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Affiliation(s)
- Jonathan D. Egbert
- Center for Molecular Electrocatalysis
- Pacific Northwest National Laboratory
- Richland
- USA
| | - Molly O'Hagan
- Center for Molecular Electrocatalysis
- Pacific Northwest National Laboratory
- Richland
- USA
| | - Eric S. Wiedner
- Center for Molecular Electrocatalysis
- Pacific Northwest National Laboratory
- Richland
- USA
| | - R. Morris Bullock
- Center for Molecular Electrocatalysis
- Pacific Northwest National Laboratory
- Richland
- USA
| | | | | | - Michael T. Mock
- Center for Molecular Electrocatalysis
- Pacific Northwest National Laboratory
- Richland
- USA
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20
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Koellner CA, Piro NA, Kassel WS, Goldsmith CR, Graves CR. Synthesis and Characterization of α-Diimine Complexes of Group 13 Metals and Their Catalytic Activity toward the Epoxidation of Alkenes. Inorg Chem 2015; 54:7139-41. [DOI: 10.1021/acs.inorgchem.5b01136] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [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)
- Connor A. Koellner
- Department of Chemistry & Biochemistry, Albright College, 13th and Bern Streets, Reading, Pennsylvania 19612, United States
| | - Nicholas A. Piro
- Department of Chemistry, Villanova University, 800 Lancaster Avenue, Villanova, Pennsylvania 19085, United States
| | - W. Scott Kassel
- Department of Chemistry, Villanova University, 800 Lancaster Avenue, Villanova, Pennsylvania 19085, United States
| | - Christian R. Goldsmith
- Department of Chemistry & Biochemistry, Auburn University, 179 Chemistry Building, Auburn, Alabama 36849, United States
| | - Christopher R. Graves
- Department of Chemistry & Biochemistry, Albright College, 13th and Bern Streets, Reading, Pennsylvania 19612, United States
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21
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Charboneau DJ, Piro NA, Kassel WS, Dudley TJ, Paul JJ. Structural, electronic and acid/base properties of [Ru(bpy)(bpy(OH)2)2]2+ (bpy=2,2′-bipyridine, bpy(OH)2=4,4′-dihydroxy-2,2′-bipyridine). Polyhedron 2015. [DOI: 10.1016/j.poly.2015.02.001] [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: 11/25/2022]
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22
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Briegel AC, Cummings AK, Smith GR, Doroski MD, Boyko WJ, Piro NA, Kassel WS, Giuliano RM. Synthesis of lemonose derivatives: methyl 4-amino-3-O,4-N-carbonyl-2,4,6-trideoxy-3-C-methyl-α-l-lyxo-pyranoside and its phenyl thioglycoside. Carbohydr Res 2015; 409:63-8. [PMID: 25957213 DOI: 10.1016/j.carres.2015.03.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [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: 01/16/2015] [Revised: 02/13/2015] [Accepted: 03/08/2015] [Indexed: 11/29/2022]
Abstract
Lemonose is a component of the antibiotic lemonomycin and other antibiotics and natural products. Three routes to the synthesis of the title compound, a protected, desmethyl derivative of lemonose, from l-rhamnose or its glycal, were investigated based on electrophilic cyclization, epoxidation-ring opening, and deoxygenation of an intermediate that was used in the synthesis of the amino sugar callipeltose. The deoxygenation route was successful and it provided the title compound, which was then converted to a phenyl thioglycoside.
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Affiliation(s)
- Alicia C Briegel
- Department of Chemistry, Villanova University, Villanova, PA 19085, United States
| | - Adrienne K Cummings
- Department of Chemistry, Villanova University, Villanova, PA 19085, United States
| | - Garry R Smith
- Department of Chemistry, Villanova University, Villanova, PA 19085, United States
| | - Matthew D Doroski
- Department of Chemistry, Villanova University, Villanova, PA 19085, United States
| | - Walter J Boyko
- Department of Chemistry, Villanova University, Villanova, PA 19085, United States
| | - Nicholas A Piro
- Department of Chemistry, Villanova University, Villanova, PA 19085, United States
| | - W Scott Kassel
- Department of Chemistry, Villanova University, Villanova, PA 19085, United States
| | - Robert M Giuliano
- Department of Chemistry, Villanova University, Villanova, PA 19085, United States.
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23
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Hosseini-Yazdi SA, Hosseinpour S, Khandar AA, Kassel WS, Piro NA. Copper(II) and nickel(II) complexes with two new bis(thiosemicarbazone) ligands: Synthesis, characterization, X-ray crystal structures and their electrochemistry behavior. Inorganica Chim Acta 2015. [DOI: 10.1016/j.ica.2014.12.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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24
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Yeagle KP, Hester D, Piro NA, Dougherty WG, Kassel WS, Graves CR. Synthesis, Characterization, and Catalytic Activity of a Series of Aluminium–Amidate Complexes. Aust J Chem 2015. [DOI: 10.1071/ch14514] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The aluminium complexes {[κ2-N,O-(t-BuNCOPh)]AlMe2}2 (2), [κ2-N,O-(t-BuNCOPh)]2AlMe (3), and [κ2-N,O-(t-BuNCOPh)]3Al (4) were prepared through the protonolysis reaction between trimethylaluminium and one, two, or three equivalents, respectively, of N-tert-butylbenzamide. Complex 2 was also prepared via a salt metathesis reaction between K(t-BuNCOPh) and dimethylaluminium chloride. Complexes 2–4 were characterized using 1H and 13C NMR spectroscopy. Single-crystal X-ray diffraction analysis of the complexes corroborated ligand : metal stoichiometries and revealed that all the amidate ligands coordinate to the aluminium ion in a κ2 fashion. The Al–amidate complexes 2–4 were viable catalyst precursors for the Meerwein–Ponndorf–Verley–Oppenauer reduction–oxidation manifold, successfully interconverting several classes of carbonyl and alcohol substrates.
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25
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Becica J, Jackson AB, Koronkiewicz BM, Piro NA, Kassel WS, West NM. Synthesis and reactivity of oxygen ligated molybdenum(II) carbonyl complexes. Polyhedron 2014. [DOI: 10.1016/j.poly.2014.06.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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26
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Cole BE, Wolbach JP, Dougherty WG, Piro NA, Kassel WS, Graves CR. Synthesis and Characterization of Aluminum-α-diimine Complexes over Multiple Redox States. Inorg Chem 2014; 53:3899-906. [DOI: 10.1021/ic5003989] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [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)
- Bren E. Cole
- Department of Chemistry & Biochemistry, Albright College, 13th & Bern Street, Reading, Pennsylvania 19612, United States
| | - Jeffrey P. Wolbach
- Department of Chemistry & Biochemistry, Albright College, 13th & Bern Street, Reading, Pennsylvania 19612, United States
| | - William G. Dougherty
- Department of Chemistry, Villanova University, 800 Lancaster Avenue, Villanova, Pennsylvania 19085, United States
| | - Nicholas A. Piro
- Department of Chemistry, Villanova University, 800 Lancaster Avenue, Villanova, Pennsylvania 19085, United States
| | - W. Scott Kassel
- Department of Chemistry, Villanova University, 800 Lancaster Avenue, Villanova, Pennsylvania 19085, United States
| | - Christopher R. Graves
- Department of Chemistry & Biochemistry, Albright College, 13th & Bern Street, Reading, Pennsylvania 19612, United States
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27
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Piro NA, Robinson JR, Walsh PJ, Schelter EJ. The electrochemical behavior of cerium(III/IV) complexes: Thermodynamics, kinetics and applications in synthesis. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2013.08.034] [Citation(s) in RCA: 114] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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28
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Bogart JA, Lewis AJ, Medling SA, Piro NA, Carroll PJ, Booth CH, Schelter EJ. Homoleptic Cerium(III) and Cerium(IV) Nitroxide Complexes: Significant Stabilization of the 4+ Oxidation State. Inorg Chem 2013; 52:11600-7. [DOI: 10.1021/ic401974t] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Justin A. Bogart
- P. Roy and Diana T. Vagelos
Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Andrew J. Lewis
- P. Roy and Diana T. Vagelos
Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Scott A. Medling
- Chemical Sciences
Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Nicholas A. Piro
- P. Roy and Diana T. Vagelos
Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Patrick J. Carroll
- P. Roy and Diana T. Vagelos
Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Corwin H. Booth
- Chemical Sciences
Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Eric J. Schelter
- P. Roy and Diana T. Vagelos
Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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29
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Gramigna KM, Oria JV, Mandell CL, Tiedemann MA, Dougherty WG, Piro NA, Kassel WS, Chan BC, Diaconescu PL, Nataro C. Palladium(II) and Platinum(II) Compounds of 1,1′-Bis(phosphino)metallocene (M = Fe, Ru) Ligands with Metal–Metal Interactions. Organometallics 2013. [DOI: 10.1021/om400494t] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [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)
- Kathryn M. Gramigna
- Department of Chemistry, Lafayette College, Easton, Pennsylvania 18042, United States
| | - Jeremy V. Oria
- Department of Chemistry & Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Chelsea L. Mandell
- Department of Chemistry, Lafayette College, Easton, Pennsylvania 18042, United States
| | - Margaret A. Tiedemann
- Department of Chemistry, Lafayette College, Easton, Pennsylvania 18042, United States
| | - William G. Dougherty
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Nicholas A. Piro
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - W. Scott Kassel
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Benny C. Chan
- Department of Chemistry, The College of New Jersey, Ewing, New Jersey 08628, United States
| | - Paula L. Diaconescu
- Department of Chemistry & Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Chip Nataro
- Department of Chemistry, Lafayette College, Easton, Pennsylvania 18042, United States
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30
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Mahoney BD, Piro NA, Carroll PJ, Schelter EJ. Synthesis, electrochemistry, and reactivity of cerium(III/IV) methylene-bis-phenolate complexes. Inorg Chem 2013; 52:5970-7. [PMID: 23621676 DOI: 10.1021/ic400202r] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A series of cerium complexes containing a 2,2'-methylenebis(6-tert-butyl-4-methylphenolate) (MBP(2-)) ligand framework is described. Electrochemical studies of the compound [Li(THF)2Ce(MBP)2(THF)2] (1) reveal that the metal based oxidation wave occurs at -0.93 V vs Fc/Fc(+). This potential demonstrates significant stabilization of the cerium(IV) ion in the MBP(2-) framework with a shift of ∼2.25 V from the typically reported value for the cerium(III/IV) couple of E°' = +1.30 V vs Fc/Fc(+) for Ce(ClO4)3 in HClO4 solutions. Compound 1 undergoes oxidation to form stable cerium(IV) species in the presence of a variety of common oxidants. The coordination of the redox-active ligands 2,2'-bipyridine and benzophenone to 1 result in complexes in which no apparent metal-to-ligand charge transfer occurs and the cerium ion remains in the +3 oxidation state.
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Affiliation(s)
- Brian D Mahoney
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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31
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King AE, Surendranath Y, Piro NA, Bigi JP, Long JR, Chang CJ. A mechanistic study of proton reduction catalyzed by a pentapyridine cobalt complex: evidence for involvement of an anation-based pathway. Chem Sci 2013. [DOI: 10.1039/c3sc22239j] [Citation(s) in RCA: 91] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
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32
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Harman WH, Lichterman MF, Piro NA, Chang CJ. Well-Defined Vanadium Organoazide Complexes and Their Conversion to Terminal Vanadium Imides: Structural Snapshots and Evidence for a Nitrene Capture Mechanism. Inorg Chem 2012; 51:10037-42. [DOI: 10.1021/ic301673g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [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)
- W. Hill Harman
- Chemical Sciences
Division, Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, United States
| | | | - Nicholas A. Piro
- Chemical Sciences
Division, Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, United States
| | - Christopher J. Chang
- Chemical Sciences
Division, Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, United States
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33
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Zadrozny JM, Liu J, Piro NA, Chang CJ, Hill S, Long JR. Slow magnetic relaxation in a pseudotetrahedral cobalt(ii) complex with easy-plane anisotropy. Chem Commun (Camb) 2012; 48:3927-9. [DOI: 10.1039/c2cc16430b] [Citation(s) in RCA: 256] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Abstract
A set of robust molecular cobalt catalysts for the generation of hydrogen from water is reported. The cobalt complex supported by the parent pentadentate polypyridyl ligand PY5Me(2) features high stability and activity and 100% Faradaic efficiency for the electrocatalytic production of hydrogen from neutral water, with a turnover number reaching 5.5 × 10(4) mol of H(2) per mole of catalyst with no loss in activity over 60 h. Control experiments establish that simple Co(II) salts, the free PY5Me(2) ligand, and an isostructural PY5Me(2) complex containing redox-inactive Zn(II) are all ineffective for this reaction. Further experiments demonstrate that the overpotential for H(2) evolution can be tuned by systematic substitutions on the ancillary PY5Me(2) scaffold, presaging opportunities to further optimize this first-generation platform by molecular design.
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Affiliation(s)
- Yujie Sun
- Department of Chemistry, University of California, Berkeley, California 94720, USA
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35
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Abstract
Nitrous oxide (N(2)O), a widespread greenhouse gas, is a thermodynamically potent and environmentally green oxidant that is an attractive target for activation by metal centers. However, N(2)O remains underutilized owing to its high kinetic stability, and the poor ligand properties of this molecule have made well-characterized metal-N(2)O complexes a rarity. We now report a vanadium-pyrrolide system that reversibly binds N(2)O at room temperature and provide the first single-crystal X-ray structure of such a complex. Further characterization by vibrational spectroscopy and DFT calculations strongly favor assignment as a linear, N-bound metal-N(2)O complex.
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Affiliation(s)
- Nicholas A Piro
- Department of Chemistry, University of California, Berkeley, California 94720, United States
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36
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Affiliation(s)
- Brandi M Cossairt
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
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37
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Affiliation(s)
- Joshua S. Figueroa
- Department of Chemistry, Massachusetts Institute of Technology, Room 6-435, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, United States
| | - Nicholas A. Piro
- Department of Chemistry, Massachusetts Institute of Technology, Room 6-435, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, United States
| | - Daniel J. Mindiola
- Department of Chemistry, Massachusetts Institute of Technology, Room 6-435, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, United States
| | - Michael G. Fickes
- Department of Chemistry, Massachusetts Institute of Technology, Room 6-435, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, United States
| | - Christopher C. Cummins
- Department of Chemistry, Massachusetts Institute of Technology, Room 6-435, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, United States
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38
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Abstract
A terminal molybdenum arsenide complex is synthesized in one step from the reactive As(4) molecule. The properties of this complex with its arsenic atom ligand are discussed in relation to the analogous nitride and phosphide complexes.
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Affiliation(s)
- John J Curley
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
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39
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Spinney HA, Piro NA, Cummins CC. Triple-bond reactivity of an AsP complex intermediate: synthesis stemming from molecular arsenic, As(4). J Am Chem Soc 2010; 131:16233-43. [PMID: 19842699 DOI: 10.1021/ja906550h] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
While P(4) is the stable molecular form of phosphorus, a recent study illustrated the possibility of P(2) generation for reactions in organic media under mild conditions. The heavier group 15 element arsenic can exist as As(4) molecules, but As(4) cannot be stored as a pure substance because it is both light-sensitive and reverts thermally to its stable, metallic gray form. Herein we report As(4) activation giving rise to a mu-As(2) diniobium complex, serving in turn as precursor to a terminal arsenide anion complex of niobium. Functionalization of the latter provides the new AsPNMes* ligand, which when complexed with tungsten pentacarbonyl elicits extrusion of the (AsP)W(CO)(5) molecule as a reactive intermediate. Trapping reactions of the latter with organic dienes are found to furnish double Diels-Alder adducts in which the AsP unit is embedded in a polycyclic organic framework. Thermal generation of (AsP)W(CO)(5) in the presence of the neutral terminal phosphide complex P identical withMo(N[(i)Pr]Ar)(3) leads to the cyclo-AsP(2) complex (OC)(5)W(cyclo-AsP(2))Mo(N[(i)Pr]Ar)(3). The (AsP)W(CO)(5) trapping products were crystallized and characterized by X-ray diffraction methods, and computational methods were applied for analysis of the As-As and As-P bonds in the complexes.
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Affiliation(s)
- Heather A Spinney
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
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40
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Abstract
The terminal phosphorus monoxide complex (OP)Mo(N[(t)Bu]Ar)(3), 1 (Ar = 3,5-Me(2)C(6)H(3)), undergoes an O-for-PSiR(3) metathesis reaction with the niobium phosphinidene complex (i)Pr(3)SiPNb(N[CH(2)(t)Bu]Ar)(3), 2, to generate the oxoniobium complex ONb(N[CH(2)(t)Bu]Ar)(3), 3, and the diphosphenido complex (i)Pr(3)SiPPMo(N[(t)Bu]Ar)(3), 4. The structure of 4, as determined by X-ray crystallography, contains a "singly bent" diphosphenido moiety, suggesting that the diphosphenido ligand serves as a 3e(-) donor to a formally d(2) metal center. This bonding characterization was supported by DFT calculations and is unique among known diphosphenido complexes. Diphosphenido 4 was found to react over time to produce products consistent with a bimolecular degradation pathway where the terminal phosphide complex PMo(N[(t)Bu]Ar)(3), 5, serves as a stable leaving group. Mixtures of 4 and PPh(3) were observed to set up an equilibrium (K(eq) = 0.7) between 4, PPh(3), and the products of phosphinidene transfer, 5 and (i)Pr(3)SiP=PPh(3).
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Affiliation(s)
- Nicholas A Piro
- Department of Chemistry, 77 Massachusetts Avenue, Room 6-435, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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41
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Affiliation(s)
- Nicholas A. Piro
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room 6-435, Cambridge, Massachusetts 02139
| | - Christopher C. Cummins
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room 6-435, Cambridge, Massachusetts 02139
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42
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Abstract
Ethylenebis(triphenylphosphine)platinum is used as a trap for the P2-containing molecule W(CO)5(P2), which is eliminated at room temperature from a niobium-complexed diphosphaazide ligand. The rate of W(CO)5(P2) elimination is unaffected by the presence of the platinum species. Attempts to generate and trap free P2 with the platinum ethylene complex were hindered by the direct reaction between the platinum starting material and the P2 generator, (Mes*NPP)Nb(N[Np]Ar)3. In this case, reductive cleavage of the P-P bond in the diphosphaazide ligand is induced by platinum coordination, resulting in the formation of a trimetallic system with two bridging, three-coordinate phosphorus atoms.
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Affiliation(s)
- Nicholas A Piro
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
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43
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Fox AR, Clough CR, Piro NA, Cummins CC. A terminal nitride-to-phosphide conversion sequence followed by tungsten phosphide functionalization using a diphenylphosphenium synthon. Angew Chem Int Ed Engl 2007; 46:973-6. [PMID: 17211909 DOI: 10.1002/anie.200604736] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [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)
- Alexander R Fox
- Department of Chemistry, Room 6-435, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139-4307, USA
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44
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Agarwal P, Piro NA, Meyer K, Müller P, Cummins CC. An Isolable and Monomeric Phosphorus Radical That Is Resonance-Stabilized by the Vanadium(IV/V) Redox Couple. Angew Chem Int Ed Engl 2007; 46:3111-4. [PMID: 17351998 DOI: 10.1002/anie.200700059] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Paresh Agarwal
- Department of Chemistry, Massachusetts Institute of Technology, Room 6-435, Cambridge, MA 02139-4307, USA
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45
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Abstract
We report a mild method for generating the diphosphorus molecule or its synthetic equivalent in homogeneous solution; the P2 allotrope of the element phosphorus is normally obtained only under extreme conditions (for example, from P4 at 1100 kelvin). Diphosphorus is extruded from a niobium complex designed for this purpose and can be trapped efficiently by two equivalents of an organic diene to produce an organodiphosphorus compound. Diphosphorus stabilized by coordination to tungsten pentacarbonyl can be generated similarly at 25 degrees C, and in this stabilized form it still efficiently consumes two organic diene molecules for every diphosphorus unit.
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Affiliation(s)
- Nicholas A Piro
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139-4307, USA
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46
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Figueroa JS, Piro NA, Clough CR, Cummins CC. A Nitridoniobium(V) Reagent That Effects Acid Chloride to Organic Nitrile Conversion: Synthesis via Heterodinuclear (Nb/Mo) Dinitrogen Cleavage, Mechanistic Insights, and Recycling. J Am Chem Soc 2005; 128:940-50. [PMID: 16417385 DOI: 10.1021/ja056408j] [Citation(s) in RCA: 132] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The transformation of acid chlorides (RC(O)Cl) to organic nitriles (RC[triple bond]N) by the terminal niobium nitride anion [N[triple bond]Nb(N[Np]Ar)3]- ([1a-N]-, where Np = neopentyl and Ar = 3,5-Me2C6H3) via isovalent N for O(Cl) metathetical exchange is presented. Nitrido anion [1a-N]- is obtained in a heterodinuclear N2 scission reaction employing the molybdenum trisamide system, Mo(N[R]Ar)3 (R = t-Bu, 2a; R = Np, 2b), as a reaction partner. Reductive scission of the heterodinuclear bridging N2 complexes, (Ar[R]N)3Mo-(mu-N2)Nb(N[Np]Ar)3 (R = t-Bu, 3b; R = Np, 3c) with sodium amalgam provides 1 equiv each of the salt Na[1a-N] and neutral N[triple bond]Mo(N[R]Ar)3 (R = t-Bu, 2a-N; R = Np, 2b-N). Separation of 2-N from Na[1a-N] is readily achieved. Treatment of salt Na[1a-N] with acid chloride substrates in tetrahydrofuran (THF) furnishes the corresponding organic nitriles concomitant with the formation of NaCl and the oxo niobium complex O[triple bond]Nb(N[Np]Ar)3 (1a-O). Utilization of 15N-labeled 15N2 gas in this chemistry affords a series of 15N-labeled organic nitriles establishing the utility of anion [1a-N]- as a reagent for the 15N-labeling of organic molecules. Synthetic and computational studies on model niobium systems provide evidence for the intermediacy of both a linear acylimido and niobacyclobutene species along the pathway to organic nitrile formation. High-yield recycling of oxo 1a-O to a niobium triflate complex appropriate for heterodinuclear N2 scission has been developed. Specifically, addition of triflic anhydride (Tf2O, where Tf = SO2CF3) to an Et2O solution of 1a-O provides the bistriflate complex, Nb(OTf)2(N[Np]Ar)3 (1a-(OTf)2), in near quantitative yield. One-electron reduction of 1a-(OTf)2 with either cobaltocene (Cp2Co) or Mg(THF)3(anthracene) provided the monotriflato complex, Nb(OTf)(N[Np]Ar)3 (1a-(OTf)), which efficiently regenerates complexes 3b and 3c when treated with the molybdenum dinitrogen anions [N2Mo(N[t-Bu]Ar)3]- ([2a-N2]-) or [N2Mo(N[Np]Ar)3]- ([2b-N2]-), respectively.
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Affiliation(s)
- Joshua S Figueroa
- Massachusetts Institute of Technology, Room 2-227, 77 Massachusetts Avenue, Cambridge Massachusetts 02139, USA
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Piro NA, Owen JS, Bercaw JE. Pyridinium-derived N-heterocyclic carbene ligands: syntheses, structures and reactivity of N-(2′-pyridyl)pyridin-2-ylidene complexes of nickel(II), palladium(II) and platinum(II). Polyhedron 2004. [DOI: 10.1016/j.poly.2004.06.021] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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