1
|
Hua W, Shang T, Li H, Sun Y, Guo Y, Xia J, Geng C, Hu Z, Peng L, Han Z, Zhang C, Lv W, Wan Y. Optimizing the p charge of S in p-block metal sulfides for sulfur reduction electrocatalysis. Nat Catal 2023. [DOI: 10.1038/s41929-023-00912-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
|
2
|
Nishiyama T, Takahashi N, Mibu T, Maekawa M, Kuroda-Sowa T, Suenaga Y, Okubo T. Synthesis, crystal structures and characterization of Nickel(II) complexes with dithiobenzoate derivatives. RESULTS IN CHEMISTRY 2022. [DOI: 10.1016/j.rechem.2022.100470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
3
|
Zhang Y, Duan W, Wang Q, Zheng L, Wang J, Chen J, Sun T. Covalency between the uranyl ion and dithiophosphinate by sulfur K-edge X-ray absorption spectroscopy and density functional theory. JOURNAL OF SYNCHROTRON RADIATION 2022; 29:11-20. [PMID: 34985418 PMCID: PMC8733989 DOI: 10.1107/s160057752101198x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 11/10/2021] [Indexed: 06/14/2023]
Abstract
The dithiophosphinic acids (HS2PR2) have been used for the selective separation of trivalent actinides (AnIII) from lanthanides (LnIII) over the past decades. The substituents on the dithiophosphinic acids dramatically impact the separation performance, but the mechanism is still open for debate. In this work, two dithiophosphinic acids with significantly different AnIII/LnIII separation performance, i.e. diphenyl dithiophosphinic acid (HS2PPh2) and bis(ortho-trifluoromethylphenyl) dithiophosphinic acid [HS2P(o-CF3C6H4)2], are employed to understand the substituent effect on the bonding covalency between the S2PR2- anions (R = Ph and o-CF3C6H4) and the uranyl ion by sulfur K-edge X-ray absorption spectroscopy (XAS) in combination with density functional theory calculations. The two UO2(S2PR2)(EtOH) complexes display similar XAS spectra, in which the first pre-edge feature with an intensity of 0.16 is entirely attributed to the transitions from S 1s orbitals to the unoccupied molecular orbitals due to the mixing between U 5f and S 3p orbitals. The Mulliken population analysis indicates that the amount of \% S 3p character in these orbitals is essentially identical for the UO2(S2PPh2)2(EtOH) and UO2[S2P(o-CF3C6H4)2]2(EtOH) complexes, which is lower than that in the U 6d-based orbitals. The essentially identical covalency in U-S bonds for the two UO2(S2PR2)2(EtOH) complexes are contradictory to the significantly different AnIII/LnIII separation performance of the two dithiophosphinic acids, thus the covalency seems to be unable to account for substituent effects in the AnIII/LnIII separation by the dithiophosphinic acids. The results in this work provide valuable insight into the understanding of the mechanism in the AnIII/LnIII separation by the dithiophosphinic acids.
Collapse
Affiliation(s)
- Yusheng Zhang
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, People's Republic of China
| | - Wuhua Duan
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, People's Republic of China
| | - Qiang Wang
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, People's Republic of China
| | - Lei Zheng
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Jianchen Wang
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, People's Republic of China
| | - Jing Chen
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, People's Republic of China
| | - Taoxiang Sun
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, People's Republic of China
| |
Collapse
|
4
|
Queen MS, Jalilehvand F, Szilagyi RK. Ground electronic state description of thiourea coordination in homoleptic Zn 2+, Ni 2+ and Co 2+ complexes using sulfur K-edge X-ray absorption spectroscopy. JOURNAL OF SYNCHROTRON RADIATION 2021; 28:1825-1838. [PMID: 34738936 PMCID: PMC8570210 DOI: 10.1107/s1600577521008389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 08/12/2021] [Indexed: 06/13/2023]
Abstract
Sulfur K-edge X-ray absorption spectroscopy (XAS) was employed to experimentally characterize the coordinative bond between the thiourea (TU) or thiocarbamide ligand and transition metal (TM) ions Zn2+, Co2+ and Ni2+ in distorted tetrahedral and octahedral homoleptic coordination environments. Comparisons of XAS spectra of the free TU ligand and [Zn(TU)4]2+, [Co(TU)4]2+ and [Ni(TU)6]2+ complexes clearly identify spectral features unique to TM2+-S(TU) bonding. Quantitative analysis of pre-edge intensities describes the covalency of Ni2+-S(TU) and Co2+-S(TU) bonding to be at most 21% and 9% as expressed by the S 3p contributions per TM 3d electron hole. Using relevant Ni2+ complexes with dithiocarbamate and thioether ligands, we evaluated the empirical S 1s → 3p transition dipole integrals developed for S-donor ligands and their dependence on heteroatom substitutions. With the aid of density functional theory-based ground electronic state calculations, we found evidence for the need of using a transition dipole that is dependent on the presence of conjugated heteroatom (N) substitution in these S-donor ligands.
Collapse
Affiliation(s)
- Matt S. Queen
- Biological and Physical Sciences, Montana State University Billings, Billings, MT 59101, USA
| | | | - Robert K. Szilagyi
- Department of Chemistry and Biochemistry, Montana State University, 700 Cleveland Street, Bozeman, MT 59717, USA
| |
Collapse
|
5
|
Frank P, Benfatto M. Symmetry Breaking in Solution-Phase [Cu(tsc) 2(H 2O) 2] 2+: Emergent Asymmetry in Cu-S Distances and in Covalence. J Phys Chem B 2021; 125:10779-10795. [PMID: 34546762 DOI: 10.1021/acs.jpcb.1c05022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The structure of aqueous Cu(II)-bis-thiosemicarbazide, [Cu(tsc)2]2+, is reported following EXAFS and MXAN analyses of the copper K-edge X-ray absorption (XAS) spectrum. The rising K-edge feature at 8987.1 eV is higher energy than those of crystalline models, implying unique electronic and structural solution states. EXAFS analysis (k = 2-13 Å-1; 2 × Cu-N = 2.02 ± 0.01 Å; 2 × Cu-S = 2.27 ± 0.01 Å; Cu-Oax = 2.41 ± 0.04 Å) could not resolve 5- versus 6-coordinate models. However, MXAN fits converged to an asymmetric broken symmetry 6-coordinate model with cis-disposed TSC ligands (Cu-Oax = 2.07 and 2.54 Å; Cu-N = 1.94 Å, 1.98 Å; Cu-S = 2.20 Å, 2.41 Å). Transition dipole integral evaluation of the sulfur K-edge XAS 1s → 3p valence transition feature at 2470.7 eV yielded a Cu-S covalence of 0.66 e-, indicating Cu1.34+. The high Cu-S covalence and short Cu-S bond in aqueous [Cu(tsc)2(H2O)2]2+ again contradict the need for a protein rack to explain the unique structure of the blue copper active site. MXAN models of dissolved Cu(II) complex ions have invariably featured broken centrosymmetry. The potential energy ground state for dissolved Cu(II) evidently includes the extended solvation field, providing a target for improved physical theory. A revised solvation model for aqueous Cu(II), |[Cu(H2O)5]·14H2O|2+, is presented.
Collapse
Affiliation(s)
- Patrick Frank
- Stanford Synchrotron Radiation Lightsource, SLAC, Stanford University, Menlo Park, California 94025, United States.,Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Maurizio Benfatto
- Laboratori Nazionali di Frascati-INFN, P.O. Box 13, 00044 Frascati, Italy
| |
Collapse
|
6
|
Kisgeropoulos EC, Manesis AC, Shafaat HS. Ligand Field Inversion as a Mechanism to Gate Bioorganometallic Reactivity: Investigating a Biochemical Model of Acetyl CoA Synthase Using Spectroscopy and Computation. J Am Chem Soc 2021; 143:849-867. [PMID: 33415980 DOI: 10.1021/jacs.0c10135] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The biological global carbon cycle is largely regulated through microbial nickel enzymes, including carbon monoxide dehydrogenase (CODH), acetyl coenzyme A synthase (ACS), and methyl coenzyme M reductase (MCR). These systems are suggested to utilize organometallic intermediates during catalysis, though characterization of these species has remained challenging. We have established a mutant of nickel-substituted azurin as a scaffold upon which to develop protein-based models of enzymatic intermediates, including the organometallic states of ACS. In this work, we report the comprehensive investigation of the S = 1/2 Ni-CO and Ni-CH3 states using pulsed EPR spectroscopy and computational techniques. While the Ni-CO state shows conventional metal-ligand interactions and a classical ligand field, the Ni-CH3 hyperfine interactions between the methyl protons and the nickel indicate a closer distance than would be expected for an anionic methyl ligand. Structural analysis instead suggests a near-planar methyl ligand that can be best described as cationic. Consistent with this conclusion, the frontier molecular orbitals of the Ni-CH3 species indicate a ligand-centered LUMO, with a d9 population on the metal center, rather than the d7 population expected for a typical metal-alkyl species generated by oxidative addition. Collectively, these data support the presence of an inverted ligand field configuration for the Ni-CH3 Az species, in which the lowest unoccupied orbital is centered on the ligands rather than the more electropositive metal. These analyses provide the first evidence for an inverted ligand field within a biological system. The functional relevance of the electronic structures of both the Ni-CO and Ni-CH3 species are discussed in the context of native ACS, and an inverted ligand field is proposed as a mechanism by which to gate reactivity both within ACS and in other thiolate-containing metalloenzymes.
Collapse
Affiliation(s)
- Effie C Kisgeropoulos
- Department of Chemistry and Biochemistry and Ohio State Biochemistry Program, The Ohio State University, Columbus, Ohio 43210, United States
| | - Anastasia C Manesis
- Department of Chemistry and Biochemistry and Ohio State Biochemistry Program, The Ohio State University, Columbus, Ohio 43210, United States
| | - Hannah S Shafaat
- Department of Chemistry and Biochemistry and Ohio State Biochemistry Program, The Ohio State University, Columbus, Ohio 43210, United States
| |
Collapse
|
7
|
Formation and Structures of the μ4-Oxygen-Bridged High-Nuclearity Lead(II) Clusters from a Lead Propane-2-thiolate Complex. J CLUST SCI 2020. [DOI: 10.1007/s10876-020-01917-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
8
|
Gompa TP, Ramanathan A, Rice NT, La Pierre HS. The chemical and physical properties of tetravalent lanthanides: Pr, Nd, Tb, and Dy. Dalton Trans 2020; 49:15945-15987. [DOI: 10.1039/d0dt01400a] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The thermochemistry, descriptive chemistry, spectroscopy, and physical properties of the tetravalent lanthanides (Pr, Nd, Tb and Dy) in extended phases, gas phase, solution, and as isolable molecular complexes are presented.
Collapse
Affiliation(s)
- Thaige P. Gompa
- Department of Chemistry and Biochemistry
- Georgia Institute of Technology
- Atlanta
- USA
| | - Arun Ramanathan
- Department of Chemistry and Biochemistry
- Georgia Institute of Technology
- Atlanta
- USA
| | - Natalie T. Rice
- Department of Chemistry and Biochemistry
- Georgia Institute of Technology
- Atlanta
- USA
| | - Henry S. La Pierre
- Department of Chemistry and Biochemistry
- Georgia Institute of Technology
- Atlanta
- USA
- Nuclear and Radiological Engineering Program
| |
Collapse
|
9
|
Bao SJ, Liu CY, Zhang M, Chen XR, Yu H, Li HX, Braunstein P, Lang JP. Metal complexes with the zwitterion 4-(trimethylammonio)benzenethiolate: Synthesis, structures and applications. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.06.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
10
|
Lee K, Blake AV, Donahue CM, Spielvogel KD, Bellott BJ, Daly SR. Quantifying the Interdependence of Metal–Ligand Covalency and Bond Distance Using Ligand K‐edge XAS. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201905635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Kyounghoon Lee
- Department of Chemistry The University of Iowa E331 Chemistry Building Iowa City IA 52242-1294 USA
| | - Anastasia V. Blake
- Department of Chemistry The University of Iowa E331 Chemistry Building Iowa City IA 52242-1294 USA
| | - Courtney M. Donahue
- Department of Chemistry The University of Iowa E331 Chemistry Building Iowa City IA 52242-1294 USA
| | - Kyle D. Spielvogel
- Department of Chemistry The University of Iowa E331 Chemistry Building Iowa City IA 52242-1294 USA
| | - Brian J. Bellott
- Department of Chemistry Western Illinois University 1 University Circle Macomb IL 61455 USA
| | - Scott R. Daly
- Department of Chemistry The University of Iowa E331 Chemistry Building Iowa City IA 52242-1294 USA
| |
Collapse
|
11
|
Lee K, Blake AV, Donahue CM, Spielvogel KD, Bellott BJ, Daly SR. Quantifying the Interdependence of Metal-Ligand Covalency and Bond Distance Using Ligand K-edge XAS. Angew Chem Int Ed Engl 2019; 58:12451-12455. [PMID: 31271502 DOI: 10.1002/anie.201905635] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 06/24/2019] [Indexed: 01/25/2023]
Abstract
Bond distance is a common structural metric used to assess changes in metal-ligand bonds, but it is not clear how sensitive changes in bond distances are with respect to changes in metal-ligand covalency. Here we report ligand K-edge XAS studies on Ni and Pd complexes containing different phosphorus(III) ligands. Despite the large number of electronic and structural permutations, P K-edge pre-edge peak intensities reveal a remarkable correlation that spectroscopically quantifies the linear interdependence of covalent M-P σ bonding and bond distance. Cl K-edge studies conducted on many of the same Ni and Pd compounds revealed a poor correlation between M-Cl bond distance and covalency, but a strong correlation was established by analyzing Cl K-edge data for Ti complexes with a wider range of Ti-Cl bond distances. Together these results establish a quantitative framework to begin making more accurate assessments of metal-ligand covalency using bond distances from readily-available crystallographic data.
Collapse
Affiliation(s)
- Kyounghoon Lee
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, IA, 52242-1294, USA
| | - Anastasia V Blake
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, IA, 52242-1294, USA
| | - Courtney M Donahue
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, IA, 52242-1294, USA
| | - Kyle D Spielvogel
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, IA, 52242-1294, USA
| | - Brian J Bellott
- Department of Chemistry, Western Illinois University, 1 University Circle, Macomb, IL, 61455, USA
| | - Scott R Daly
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, IA, 52242-1294, USA
| |
Collapse
|
12
|
Rajpurohit J, Shanmugam M. The molecular and electronic structure of an unusual cobalt NNO pincer ligand complex. Dalton Trans 2019; 48:7378-7387. [PMID: 30949637 DOI: 10.1039/c9dt00056a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of two equivalents of [Co(PMe3)4] (1) with one equivalent of a neutral NNO pincer ligand (L1) led to the formation of purple-coloured single crystals. The crystal structure determination reveals the molecular structure as a cobalt dimer [Co2(L1)(PMe3)5], which is solved in the triclinic P1[combining macron] space group. Although this species appears to have a formal zero oxidation state on cobalt ions, careful analysis of the structural parameters of the L1 reveals that the NNO ligand is reduced by three electrons; this observation has rarely been reported in the literature. Therefore, herein, more accurate description of the molecular formula [(PMe3)2CoII(η4-L13-)CoI(PMe3)3] (2) was proposed. In 2, we observed an unusual η3-π-allyl-type binding mode of the pyridine ring carbon atoms of the L13- ligand with the cobalt ion. X-ray photoelectron spectroscopy not only reveals the presence of the mixed valent cobalt ion within 2 but also unambiguously discloses the spin state of these metal ions (Co(i) diamagnetic (low-spin) and Co(ii) paramagnetic (high-spin)). The proposed electronic structure is consistent with the magnetic moment measured at room temperature. The electronic structure of 2 was further supported by the Q-band EPR measurements performed on polycrystalline sample of 2 at 5.0 K, and the presence of two independent S = ½ states was revealed. This has been qualitatively rationalized based on the super-exchange coupling pathway observed in 2. The NMR studies performed for 2 (C6D6 solvent) evidently showed that the solid-state structure of 2 was maintained in solution.
Collapse
Affiliation(s)
- Jitendrasingh Rajpurohit
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, Maharashtra, India.
| | - Maheswaran Shanmugam
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, Maharashtra, India.
| |
Collapse
|
13
|
Koroidov S, Hong K, Kjaer KS, Li L, Kunnus K, Reinhard M, Hartsock RW, Amit D, Eisenberg R, Pemmaraju CD, Gaffney KJ, Cordones AA. Probing the Electron Accepting Orbitals of Ni-Centered Hydrogen Evolution Catalysts with Noninnocent Ligands by Ni L-Edge and S K-Edge X-ray Absorption. Inorg Chem 2018; 57:13167-13175. [DOI: 10.1021/acs.inorgchem.8b01497] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sergey Koroidov
- PULSE Institute, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
| | - Kiryong Hong
- PULSE Institute, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
| | - Kasper S. Kjaer
- PULSE Institute, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
| | - Lin Li
- PULSE Institute, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
| | - Kristjan Kunnus
- PULSE Institute, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
| | - Marco Reinhard
- PULSE Institute, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
| | - Robert W. Hartsock
- PULSE Institute, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
| | - Das Amit
- Department of Chemistry, University of Rochester, RC Box 270216, Rochester, New York 14627, United States
| | - Richard Eisenberg
- Department of Chemistry, University of Rochester, RC Box 270216, Rochester, New York 14627, United States
| | - C. Das Pemmaraju
- Theory Institute for Materials and Energy Spectroscopies, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Kelly J. Gaffney
- PULSE Institute, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
| | - Amy A. Cordones
- PULSE Institute, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
| |
Collapse
|
14
|
|
15
|
Blake AV, Wei H, Lee K, Donahue CM, Keith JM, Daly SR. Solution and Solid-State Ligand K-Edge XAS Studies of PdCl2
Diphosphine Complexes with Phenyl and Cyclohexyl Substituents. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800203] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Anastasia V. Blake
- Department of Chemistry; The University of Iowa; E331 Chemistry Building 52242-1294 Iowa City IA USA
| | - Haochuan Wei
- Department of Chemistry; Colgate University; 13 Oak Dr. 13346 Hamilton NY USA
| | - Kyounghoon Lee
- Department of Chemistry; The University of Iowa; E331 Chemistry Building 52242-1294 Iowa City IA USA
| | - Courtney M. Donahue
- Department of Chemistry; The University of Iowa; E331 Chemistry Building 52242-1294 Iowa City IA USA
| | - Jason M. Keith
- Department of Chemistry; Colgate University; 13 Oak Dr. 13346 Hamilton NY USA
| | - Scott R. Daly
- Department of Chemistry; The University of Iowa; E331 Chemistry Building 52242-1294 Iowa City IA USA
| |
Collapse
|
16
|
Donahue CM, Daly SR. Ligand K-Edge XAS Studies of Metal-Phosphorus Bonds: Applications, Limitations, and Opportunities. COMMENT INORG CHEM 2018. [DOI: 10.1080/02603594.2018.1465938] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
| | - Scott R. Daly
- Department of Chemistry, The University of Iowa, Iowa City, Iowa, USA
| |
Collapse
|
17
|
Blake AV, Wei H, Donahue CM, Lee K, Keith JM, Daly SR. Solid energy calibration standards for P K-edge XANES: electronic structure analysis of PPh 4Br. JOURNAL OF SYNCHROTRON RADIATION 2018; 25:529-536. [PMID: 29488933 DOI: 10.1107/s1600577518000528] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 01/08/2018] [Indexed: 06/08/2023]
Abstract
P K-edge X-ray absorption near-edge structure (XANES) spectroscopy is a powerful method for analyzing the electronic structure of organic and inorganic phosphorus compounds. Like all XANES experiments, P K-edge XANES requires well defined and readily accessible calibration standards for energy referencing so that spectra collected at different beamlines or under different conditions can be compared. This is especially true for ligand K-edge X-ray absorption spectroscopy, which has well established energy calibration standards for Cl (Cs2CuCl4) and S (Na2S2O3·5H2O), but not neighboring P. This paper presents a review of common P K-edge XANES energy calibration standards and analysis of PPh4Br as a potential alternative. The P K-edge XANES region of commercially available PPh4Br revealed a single, highly resolved pre-edge feature with a maximum at 2146.96 eV. PPh4Br also showed no evidence of photodecomposition when repeatedly scanned over the course of several days. In contrast, we found that PPh3 rapidly decomposes under identical conditions. Density functional theory calculations performed on PPh3 and PPh4+ revealed large differences in the molecular orbital energies that were ascribed to differences in the phosphorus oxidation state (III versus V) and molecular charge (neutral versus +1). Time-dependent density functional theory calculations corroborated the experimental data and allowed the spectral features to be assigned. The first pre-edge feature in the P K-edge XANES spectrum of PPh4Br was assigned to P 1s → P-C π* transitions, whereas those at higher energy were P 1s → P-C σ*. Overall, the analysis suggests that PPh4Br is an excellent alternative to other solid energy calibration standards commonly used in P K-edge XANES experiments.
Collapse
Affiliation(s)
- Anastasia V Blake
- The University of Iowa, Department of Chemistry, E331 Chemistry Building, Iowa City, IA 52242, USA
| | - Haochuan Wei
- Department of Chemistry, Colgate University, 13 Oak Drive, Hamilton, NY 13346, USA
| | - Courtney M Donahue
- The University of Iowa, Department of Chemistry, E331 Chemistry Building, Iowa City, IA 52242, USA
| | - Kyounghoon Lee
- The University of Iowa, Department of Chemistry, E331 Chemistry Building, Iowa City, IA 52242, USA
| | - Jason M Keith
- Department of Chemistry, Colgate University, 13 Oak Drive, Hamilton, NY 13346, USA
| | - Scott R Daly
- The University of Iowa, Department of Chemistry, E331 Chemistry Building, Iowa City, IA 52242, USA
| |
Collapse
|
18
|
Schlimgen AW, Mazziotti DA. Static and Dynamic Electron Correlation in the Ligand Noninnocent Oxidation of Nickel Dithiolates. J Phys Chem A 2017; 121:9377-9384. [DOI: 10.1021/acs.jpca.7b09567] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Anthony W. Schlimgen
- Department of Chemistry and
the James Franck Institute, The University of Chicago, Chicago, Illinois 60637, United States
| | - David A. Mazziotti
- Department of Chemistry and
the James Franck Institute, The University of Chicago, Chicago, Illinois 60637, United States
| |
Collapse
|
19
|
Juncal LC, Avila J, Asensio MC, Della Védova CO, Romano RM. Electronic structure determination using an assembly of conventional and synchrotron techniques: The case of a xanthate complex. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 180:183-192. [PMID: 28285243 DOI: 10.1016/j.saa.2017.03.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Revised: 02/26/2017] [Accepted: 03/01/2017] [Indexed: 06/06/2023]
Abstract
The electronic properties of the coordination complex nickel (II) bis-n-propylxanthate, Ni(CH3(CH2)2OC(S)S)2, were studied by a combination of complementary experimental (both laboratory and synchrotron based techniques) and theoretical methods. Energy differences between HOMOs and LUMOs were determined from UV-visible spectroscopy. The assignment of the transitions were performed with the aid of TD-DFT calculations and based in symmetry considerations. The analysis of the Raman excitation profiles of selected vibrational modes of the complex, taken in resonance with a particular electronic transition, was found to reinforce the electronic assignment. Experimental binding energies of inner and core electrons were determined by PES measurements. Ni K-edge, S K-edge, Ni L-edge, O K-edge and C K-edge XANES spectra were interpreted in terms of the promotion of core electrons to unoccupied electronic levels. An experimental quantitative molecular orbital diagram was constructed using the information extracted from the different techniques.
Collapse
Affiliation(s)
- Luciana C Juncal
- CEQUINOR (UNLP, CCT-CONICET La Plata), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Blvd. 120 N° 1465, CC 962, La Plata CP 1900, Argentina
| | - José Avila
- Synchrotron SOLEIL, Orme des Merisiers - Saint Aubin BP 48, 91192 Gif sur Yvette Cedex, France
| | - Maria Carmen Asensio
- Synchrotron SOLEIL, Orme des Merisiers - Saint Aubin BP 48, 91192 Gif sur Yvette Cedex, France
| | - Carlos O Della Védova
- CEQUINOR (UNLP, CCT-CONICET La Plata), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Blvd. 120 N° 1465, CC 962, La Plata CP 1900, Argentina
| | - Rosana M Romano
- CEQUINOR (UNLP, CCT-CONICET La Plata), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Blvd. 120 N° 1465, CC 962, La Plata CP 1900, Argentina.
| |
Collapse
|
20
|
Ochmann M, von Ahnen I, Cordones AA, Hussain A, Lee JH, Hong K, Adamczyk K, Vendrell O, Kim TK, Schoenlein RW, Huse N. Light-Induced Radical Formation and Isomerization of an Aromatic Thiol in Solution Followed by Time-Resolved X-ray Absorption Spectroscopy at the Sulfur K-Edge. J Am Chem Soc 2017; 139:4797-4804. [PMID: 28219243 DOI: 10.1021/jacs.6b12992] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We applied time-resolved sulfur-1s absorption spectroscopy to a model aromatic thiol system as a promising method for tracking chemical reactions in solution. Sulfur-1s absorption spectroscopy allows tracking multiple sulfur species with a time resolution of ∼70 ps at synchrotron radiation facilities. Experimental transient spectra combined with high-level electronic structure theory allow identification of a radical and two thione isomers, which are generated upon illumination with 267 nm radiation. Moreover, the regioselectivity of the thione isomerization is explained by the resulting radical frontier orbitals. This work demonstrates the usefulness and potential of time-resolved sulfur-1s absorption spectroscopy for tracking multiple chemical reaction pathways and transient products of sulfur-containing molecules in solution.
Collapse
Affiliation(s)
- Miguel Ochmann
- Department of Physics, University of Hamburg and Center for Free Electron Laser Science , 22761 Hamburg, Germany.,Max Planck Institute for the Structure and Dynamics of Matter , 22761 Hamburg, Germany
| | - Inga von Ahnen
- Department of Physics, University of Hamburg and Center for Free Electron Laser Science , 22761 Hamburg, Germany
| | - Amy A Cordones
- Ultrafast X-ray Science Lab, Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
| | - Abid Hussain
- Department of Physics, University of Hamburg and Center for Free Electron Laser Science , 22761 Hamburg, Germany.,Max Planck Institute for the Structure and Dynamics of Matter , 22761 Hamburg, Germany
| | - Jae Hyuk Lee
- Ultrafast X-ray Science Lab, Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
| | - Kiryong Hong
- Ultrafast X-ray Science Lab, Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.,Department of Chemistry and Chemistry Institute of Functional Materials, Pusan National University , Busan 46241, South Korea
| | - Katrin Adamczyk
- Department of Physics, University of Hamburg and Center for Free Electron Laser Science , 22761 Hamburg, Germany.,Max Planck Institute for the Structure and Dynamics of Matter , 22761 Hamburg, Germany
| | - Oriol Vendrell
- Center for Free-Electron Laser Science, DESY and The Hamburg Centre for Ultrafast Imaging , 22607 Hamburg, Germany
| | - Tae Kyu Kim
- Department of Chemistry and Chemistry Institute of Functional Materials, Pusan National University , Busan 46241, South Korea
| | - Robert W Schoenlein
- Ultrafast X-ray Science Lab, Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
| | - Nils Huse
- Department of Physics, University of Hamburg and Center for Free Electron Laser Science , 22761 Hamburg, Germany.,Max Planck Institute for the Structure and Dynamics of Matter , 22761 Hamburg, Germany
| |
Collapse
|
21
|
Frank P, Szilagyi RK, Gramlich V, Hsu HF, Hedman B, Hodgson KO. Spin-Polarization-Induced Preedge Transitions in the Sulfur K-Edge XAS Spectra of Open-Shell Transition-Metal Sulfates: Spectroscopic Validation of σ-Bond Electron Transfer. Inorg Chem 2017; 56:1080-1093. [PMID: 28068071 PMCID: PMC5733802 DOI: 10.1021/acs.inorgchem.6b00991] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Sulfur K-edge X-ray absorption spectroscopy (XAS) spectra of the monodentate sulfate complexes [MII(itao)(SO4)(H2O)0,1] (M = Co, Ni, Cu) and [Cu(Me6tren)(SO4)] exhibit well-defined preedge transitions at 2479.4, 2479.9, 2478.4, and 2477.7 eV, respectively, despite having no direct metal-sulfur bond, while the XAS preedge of [Zn(itao)(SO4)] is featureless. The sulfur K-edge XAS of [Cu(itao)(SO4)] but not of [Cu(Me6tren)(SO4)] uniquely exhibits a weak transition at 2472.1 eV, an extraordinary 8.7 eV below the first inflection of the rising K-edge. Preedge transitions also appear in the sulfur K-edge XAS of crystalline [MII(SO4)(H2O)] (M = Fe, Co, Ni, and Cu, but not Zn) and in sulfates of higher-valent early transition metals. Ground-state density functional theory (DFT) and time-dependent DFT (TDDFT) calculations show that charge transfer from coordinated sulfate to paramagnetic late transition metals produces spin polarization that differentially mixes the spin-up (α) and spin-down (β) spin orbitals of the sulfate ligand, inducing negative spin density at the sulfate sulfur. Ground-state DFT calculations show that sulfur 3p character then mixes into metal 4s and 4p valence orbitals and various combinations of ligand antibonding orbitals, producing measurable sulfur XAS transitions. TDDFT calculations confirm the presence of XAS preedge features 0.5-2 eV below the rising sulfur K-edge energy. The 2472.1 eV feature arises when orbitals at lower energy than the frontier occupied orbitals with S 3p character mix with the copper(II) electron hole. Transmission of spin polarization and thus of radical character through several bonds between the sulfur and electron hole provides a new mechanism for the counterintuitive appearance of preedge transitions in the XAS spectra of transition-metal oxoanion ligands in the absence of any direct metal-absorber bond. The 2472.1 eV transition is evidence for further radicalization from copper(II), which extends across a hydrogen-bond bridge between sulfate and the itao ligand and involves orbitals at energies below the frontier set. This electronic structure feature provides a direct spectroscopic confirmation of the through-bond electron-transfer mechanism of redox-active metalloproteins.
Collapse
Affiliation(s)
- Patrick Frank
- Department of Chemistry, Stanford University, Stanford CA, 94305 USA
- Stanford Synchrotron Radiation Lightsource, SLAC, Stanford University, Stanford CA, 94309 USA
| | - Robert K. Szilagyi
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT 59717 and MTA-ELTE “Momentum” Chemical Structure/Function Laboratory, Budapest, 1117, Hungary
| | - Volker Gramlich
- Laboratorium fuer Kristallographie, Sonneggstrasse 5, ETH-Zentrum, No. G 62, CH-8092 Zürich, Switzerland
| | - Hua-Fen Hsu
- Department of Chemistry, National Cheng-Kung University, Tainan City 701, Taiwan
| | - Britt Hedman
- Stanford Synchrotron Radiation Lightsource, SLAC, Stanford University, Stanford CA, 94309 USA
| | - Keith O. Hodgson
- Department of Chemistry, Stanford University, Stanford CA, 94305 USA
- SLAC National Accelerator Laboratory, Stanford University, Menlo Park, CA 94025, USA
| |
Collapse
|
22
|
Fujisawa K, Kuboniwa A, Kiss M, Szilagyi RK. Mono- and binuclear tris(3-tert-butyl-2-sulfanylidene-1H-imidazol-1-yl)hydroborate bismuth(III) dichloride complexes: a soft scorpionate ligand can coordinate to p-block elements. Acta Crystallogr C Struct Chem 2016; 72:768-776. [PMID: 27811410 PMCID: PMC5095761 DOI: 10.1107/s2053229616010615] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2016] [Accepted: 06/29/2016] [Indexed: 11/10/2022] Open
Abstract
Tris(pyrazolyl)hydroborate ligands have been utilized in the fields of inorganic and coordination chemistry due to the ease of introduction of steric and electronic substitutions at the pyrazole rings. The development and use of the tris(pyrazolyl)hydroborate ligand, called a `scorpionate', were pioneered by the late Professor Swiatoslaw Trofimenko. He developed a second generation for his ligand system by the introduction of 3-tert-butyl and 3-phenyl substituents and this new ligand system accounted for many remarkable developments in inorganic and coordination chemistry in stabilizing monomeric species while maintaining an open coordination site. Bismuth is remarkably harmless among the toxic heavy metal p-block elements and is now becoming popular as a replacement for highly toxic metal elements, such as lead. Two bismuth(III) complexes of the anionic sulfur-containing tripod tris(3-tert-butyl-2-sulfanylidene-1H-imidazol-1-yl)hydroborate ligand were prepared. By recrystallization from MeOH/CH2Cl2, orange crystals of dichlorido(methanol-κO)[tris(3-tert-butyl-2-sulfanylidene-1H-imidazol-1-yl-κS)hydroborato]bismuth(III), [Bi(C21H34BN6S3)Cl2(CH4O)], (I), were obtained, manifesting a mononuclear structure. By using a noncoordinating solvent, red crystals of the binuclear structure with bridging Cl atoms were obtained, namely di-μ-chlorido-bis{chlorido[tris(3-tert-butyl-2-sulfanylidene-1H-imidazol-1-yl-κS)hydroborato]bismuth(III)}, [Bi2(C21H34BN6S3)2Cl4], (II). These complexes show {BiIIIS3Cl2O} and {BiIIIS3Cl3} coordination geometries with average BiIII-S bond lengths of 2.73 and 2.78 Å in (I) and (II), respectively. The overall BiIII coordination geometry is distorted octahedral due to stereochemically active lone pairs. The three BiIII-S bond lengths are almost equal in (I) but show considerable differences in (II), with one long and two shorter distances that also correlate with changes in the UV-Vis and 1H NMR spectra. For direct measurements of the Bi-S/Cl coordination, ligand K-edge X-ray absorption measurements were carried out in combination with ground and excited-state electronic structure analyses. For p-block elements, these sulfur-containing ligands are useful for preparing the appropriate complexes due to their flexible coordination geometry.
Collapse
Affiliation(s)
- Kiyoshi Fujisawa
- Department of Chemistry, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
| | - Ayaka Kuboniwa
- Department of Chemistry, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
| | - Mercedesz Kiss
- MTA–ELTE Lendület Chemical Structure/Function Laboratory, Budapest 1117, Hungary
| | - Robert K. Szilagyi
- MTA–ELTE Lendület Chemical Structure/Function Laboratory, Budapest 1117, Hungary
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT 59718, USA
| |
Collapse
|
23
|
Soma S, Van Stappen C, Kiss M, Szilagyi RK, Lehnert N, Fujisawa K. Distorted tetrahedral nickel-nitrosyl complexes: spectroscopic characterization and electronic structure. J Biol Inorg Chem 2016; 21:757-75. [DOI: 10.1007/s00775-016-1366-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 06/01/2016] [Indexed: 10/21/2022]
|
24
|
Zarkadoulas A, Field MJ, Papatriantafyllopoulou C, Fize J, Artero V, Mitsopoulou CA. Experimental and Theoretical Insight into Electrocatalytic Hydrogen Evolution with Nickel Bis(aryldithiolene) Complexes as Catalysts. Inorg Chem 2016; 55:432-44. [PMID: 26645557 PMCID: PMC5493980 DOI: 10.1021/acs.inorgchem.5b02000] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A series of neutral and monoanionic nickel dithiolene complexes with p-methoxyphenyl-substituted 1,2-dithiolene ligands have been prepared and characterized with physicochemical methods. Two of the complexes, the monoanion of the symmetric [Ni{S2C2(Ph-p-OCH3)2}2] (3(-)) with NBu4(+) as a counterion and the neutral asymmetric [Ni{S2C2(Ph)(Ph-p-OCH3)}2] (2), have been structurally characterized by single-crystal X-ray crystallography. All complexes have been employed as proton-reducing catalysts in N,N-dimethylformamide with trifluoroacetic acid as the proton source. The complexes are active catalysts with good faradaic yields, reaching 83% for 2 but relatively high overpotential requirements (0.91 and 1.55 V measured at the middle of the catalytic wave for two processes observed depending on the different routes of the mechanism). The similarity of the experimental data regardless of whether the neutral or anionic form of the complexes is used indicates that the neutral form acts as a precatalyst. On the basis of detailed density functional theory calculations, the proposed mechanism reveals two different main routes after protonation of the dianion of the catalyst in accordance with the experimental data, indicating the role of the concentration of the acid and the influence of the methoxy groups. Protonation at sulfur seems be more favorable than that at the metal, which is in marked contrast with the catalytic mechanism proposed for analogous cobalt dithiolene complexes.
Collapse
Affiliation(s)
- Athanasios Zarkadoulas
- Inorganic Chemistry Laboratory, Chemistry Department, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou 157 71, Greece
| | - Martin J. Field
- DYNAMO/DYNAMOP, Institut de Biologie Structurale, UMR CNRS/Université Grenoble Alpes/CEA 5075, EPN Campus, 6 rue Jules Horowitz F-38000 Grenoble, France
| | | | - Jennifer Fize
- Laboratory of Chemistry and Biology of Metals, Université Grenoble Alpes, CNRS, CEA, 17 rue des Martyrs, F-38000 Grenoble, France
| | - Vincent Artero
- Laboratory of Chemistry and Biology of Metals, Université Grenoble Alpes, CNRS, CEA, 17 rue des Martyrs, F-38000 Grenoble, France
| | - Christiana A. Mitsopoulou
- Inorganic Chemistry Laboratory, Chemistry Department, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou 157 71, Greece
| |
Collapse
|
25
|
Olson AC, Keith JM, Batista ER, Boland KS, Daly SR, Kozimor SA, MacInnes MM, Martin RL, Scott BL. Using solution- and solid-state S K-edge X-ray absorption spectroscopy with density functional theory to evaluate M-S bonding for MS4(2-) (M = Cr, Mo, W) dianions. Dalton Trans 2015; 43:17283-95. [PMID: 25311904 DOI: 10.1039/c4dt02302a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, we have evaluated relative changes in M-S electronic structure and orbital mixing in Group 6 MS4(2-) dianions using solid- and solution-phase S K-edge X-ray absorption spectroscopy (XAS; M = Mo, W), as well as density functional theory (DFT; M = Cr, Mo, W) and time-dependent density functional theory (TDDFT) calculations. To facilitate comparison with solution measurements (conducted in acetonitrile), theoretical models included gas-phase calculations as well as those that incorporated an acetonitrile dielectric, the latter of which provided better agreement with experiment. Two pre-edge features arising from S 1s → e* and t electron excitations were observed in the S K-edge XAS spectra and were reasonably assigned as (1)A1 → (1)T2 transitions. For MoS4(2-), both solution-phase pre-edge peak intensities were consistent with results from the solid-state spectra. For WS4(2-), solution- and solid-state pre-edge peak intensities for transitions involving e* were equivalent, while transitions involving the t orbitals were less intense in solution. Experimental and computational results have been presented in comparison to recent analyses of MO4(2-) dianions, which allowed M-S and M-O orbital mixing to be evaluated as the principle quantum number (n) for the metal valence d orbitals increased (3d, 4d, 5d). Overall, the M-E (E = O, S) analyses revealed distinct trends in orbital mixing. For example, as the Group 6 triad was descended, e* (π*) orbital mixing remained constant in the M-S bonds, but increased appreciably for M-O interactions. For the t orbitals (σ* + π*), mixing decreased slightly for M-S bonding and increased only slightly for the M-O interactions. These results suggested that the metal and ligand valence orbital energies and radial extensions delicately influenced the orbital compositions for isoelectronic ME4(2-) (E = O, S) dianions.
Collapse
Affiliation(s)
- Angela C Olson
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
| | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Donahue CM, McCollom SP, Forrest CM, Blake AV, Bellott BJ, Keith JM, Daly SR. Impact of Coordination Geometry, Bite Angle, and Trans Influence on Metal-Ligand Covalency in Phenyl-Substituted Phosphine Complexes of Ni and Pd. Inorg Chem 2015; 54:5646-59. [PMID: 25996554 DOI: 10.1021/ic503125b] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Despite the long-standing use of phosphine and diphosphine ligands in coordination chemistry and catalysis, questions remain as to their effects on metal-ligand bonding in transition metal complexes. Here we report ligand K-edge XAS, DFT, and TDDFT studies aimed at quantifying the impact of coordination geometry, diphosphine bite angle, and phosphine trans influence on covalency in M-P and M-Cl bonds. A series of four-coordinate NiCl2 and PdCl2 complexes containing PPh3 or Ph2P(CH2)nPPh2, where n = 1 (dppm), 2 (dppe), 3 (dppp), and 4 (dppb), was analyzed. The XAS data revealed that changing the coordination geometry from tetrahedral in Ni(PPh3)2Cl2 (1) to square planar in Ni(dppe)Cl2 (2) more than doubles the intensity of pre-edge features assigned to Ni-P and Ni-Cl 1s → σ* transitions. By way of comparison, varying the diphosphine in Pd(dppm)Cl2 (4), Pd(dppp)Cl2 (6), and Pd(dppb)Cl2 (7) yielded Pd-P 1s → σ* transitions with identical intensities, but a 10% increase was observed in the P K-edge XAS spectrum of Pd(dppe)Cl2 (5). A similar observation was made when comparing Ni(dppe)Cl2 (2) to Ni(dppp)Cl2 (3), and DFT and TDDFT calculations corroborated XAS results obtained for both series. Comparison of the spectroscopic and theoretical results to the diphosphine structures revealed that changes in M-P covalency were not correlated to changes in bite angles or coordination geometry. As a final measure, P and Cl K-edge XAS data were collected on trans-Pd(PPh3)2Cl2 (8) for comparison to the cis diphosphine complex Pd(dppe)Cl2 (5). Consistent with phosphine's stronger trans influence compared to chloride, a 35% decrease in the intensity of the Pd-P 1s → σ* pre-edge feature and a complementary 34% increase in Pd-Cl 1s → σ* feature was observed for 8 (trans) compared to 5 (cis). Overall, the results reveal how coordination geometry, ligand arrangement, and diphosphine structure affect covalent metal-phosphorus and metal-chloride bonding in these late transition metal complexes.
Collapse
Affiliation(s)
- Courtney M Donahue
- †Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Samuel P McCollom
- ‡Department of Chemistry, Colgate University, 13 Oak Drive, Hamilton, New York 13346, United States
| | - Chelsie M Forrest
- §Department of Chemistry, Western Illinois University, 1 University Circle, Macomb, Illinois 61455, United States
| | - Anastasia V Blake
- †Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Brian J Bellott
- §Department of Chemistry, Western Illinois University, 1 University Circle, Macomb, Illinois 61455, United States
| | - Jason M Keith
- ‡Department of Chemistry, Colgate University, 13 Oak Drive, Hamilton, New York 13346, United States
| | - Scott R Daly
- †Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| |
Collapse
|
27
|
Barton RL, Gardenghi DJ, Stolte WC, Szilagyi RK. Multiedge X-ray Absorption Spectroscopy Part II: XANES Analysis of Bridging and Terminal Chlorides in Hexachlorodipalladate(II) Complex. J Phys Chem A 2015; 119:5579-86. [DOI: 10.1021/jp5086763] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rhonda L. Barton
- Department
of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - David J. Gardenghi
- Department
of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
- Advanced Light
Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Wayne C. Stolte
- Advanced Light
Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Robert K. Szilagyi
- Department
of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| |
Collapse
|
28
|
Löble MW, Keith JM, Altman AB, Stieber SCE, Batista ER, Boland KS, Conradson SD, Clark DL, Lezama Pacheco J, Kozimor SA, Martin RL, Minasian SG, Olson AC, Scott BL, Shuh DK, Tyliszczak T, Wilkerson MP, Zehnder RA. Covalency in Lanthanides. An X-ray Absorption Spectroscopy and Density Functional Theory Study of LnCl6x– (x = 3, 2). J Am Chem Soc 2015; 137:2506-23. [DOI: 10.1021/ja510067v] [Citation(s) in RCA: 143] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Matthias W. Löble
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | - Jason M. Keith
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
- Colgate University, Hamilton, New York 13346, United States
| | - Alison B. Altman
- University of California, Berkeley, California 94720, United States
| | | | - Enrique R. Batista
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | - Kevin S. Boland
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | | | - David L. Clark
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | | | - Stosh A. Kozimor
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | - Richard L. Martin
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | - Stefan G. Minasian
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Angela C. Olson
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | - Brian L. Scott
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | - David K. Shuh
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Tolek Tyliszczak
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | | | | |
Collapse
|
29
|
The application of synchrotron radiation and in particular X-ray absorption spectroscopy to matrix isolated species. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2014.05.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
30
|
Garino C, Borfecchia E, Gobetto R, van Bokhoven JA, Lamberti C. Determination of the electronic and structural configuration of coordination compounds by synchrotron-radiation techniques. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2014.03.027] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
31
|
Donahue CM, Lezama Pacheco JS, Keith JM, Daly SR. Sulfur K-edge X-ray absorption spectroscopy and time-dependent density functional theory of arsenic dithiocarbamates. Dalton Trans 2014; 43:9189-201. [DOI: 10.1039/c4dt00078a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
|