1
|
Schwarz N, Feye J, Naina VR, Köppe R, Gillhuber S, Sun X, Roesky PW. Phospholyl and Arsolyl Triple-Decker Sandwich Complexes of Europium(II) and Strontium(II). JACS AU 2024; 4:2343-2350. [PMID: 38938793 PMCID: PMC11200235 DOI: 10.1021/jacsau.4c00300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/03/2024] [Revised: 05/17/2024] [Accepted: 05/17/2024] [Indexed: 06/29/2024]
Abstract
To study the influence of heteroatoms on the photophysical properties of divalent Eu and Sr complexes, the synthesis of the phospholyl and arsolyl compounds [{(Dtp)(thf)M}2{μ-η8:η8-C8H8}] (M = EuII and SrII; Dtp = 3,4-dimethyl-2,5-bis(tert-butyl)phospholyl) and [{(Dtas)(thf)M}2{μ-η8:η8-C8H8}] (M = EuII and SrII; Dtas = 3,4-dimethyl-2,5-bis(tert-butyl)arsolyl) is reported. Organometallic compounds of divalent europium with P and As heterocyclic ligands have not been described previously. They were prepared by salt elimination reactions from potassium phospholyl or arsolyl, K2C8H8, and EuI2(thf)2 or SrI2. Photophysical properties were investigated alongside a reference cyclopentadienyl complex with a comparable structure. Critically, the influence of the heteroatom on the photoluminescence emission and excitation and quantum yields of the complexes is significant. Density functional theory calculations were performed to rationalize the ligand influences.
Collapse
Affiliation(s)
- Noah Schwarz
- Institute
of Inorganic Chemistry, Karlsruhe Institute
of Technology, Kaiserstr. 12, 76131 Karlsruhe, Germany
| | - Julia Feye
- Institute
of Inorganic Chemistry, Karlsruhe Institute
of Technology, Kaiserstr. 12, 76131 Karlsruhe, Germany
- Faculty
of Engineering, Baden-Württemberg
Cooperative State University Karlsruhe, 76133 Karlsruhe, Germany
| | - Vanitha R. Naina
- Institute
of Inorganic Chemistry, Karlsruhe Institute
of Technology, Kaiserstr. 12, 76131 Karlsruhe, Germany
| | - Ralf Köppe
- Institute
of Inorganic Chemistry, Karlsruhe Institute
of Technology, Kaiserstr. 12, 76131 Karlsruhe, Germany
| | - Sebastian Gillhuber
- Institute
of Inorganic Chemistry, Karlsruhe Institute
of Technology, Kaiserstr. 12, 76131 Karlsruhe, Germany
| | - Xiaofei Sun
- Institute
of Inorganic Chemistry, Karlsruhe Institute
of Technology, Kaiserstr. 12, 76131 Karlsruhe, Germany
| | - Peter W. Roesky
- Institute
of Inorganic Chemistry, Karlsruhe Institute
of Technology, Kaiserstr. 12, 76131 Karlsruhe, Germany
| |
Collapse
|
2
|
Shephard ACG, Delon A, Chevreux S, Martinez A, Guo Z, Deacon GB, Lemercier G, McClenaghan N, Jonusauskas G, Junk PC, Jaroschik F. Divalent ansa-Octaphenyllanthanocenes: Synthesis, Structures, and Eu II Luminescence. Inorg Chem 2024; 63:9395-9405. [PMID: 37310150 DOI: 10.1021/acs.inorgchem.3c01062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Reductive dimerization of fulvenes using low-valent metal precursors is a straightforward one-step approach to access ethylene-bridged metallocenes. This process has so far mainly been employed with fulvenes carrying one or two substituents in the exocyclic position. In this work, a new synthesis of the unsubstituted exocyclic 1,2,3,4-tetraphenylfulvene (1), its full structural characterization by NMR spectroscopy and single-crystal X-ray diffraction, as well as some photophysical properties and its first use in reductive dimerization are described. This fulvene reacted with different lanthanoid metals in thf to provide the divalent ansa-octaphenylmetallocenes [Ln(C5Ph4CH2)2(thf)n] (Ln = Sm, n = 2 (2); Ln = Eu, n = 2 (3); and Ln = Yb, n = 1 (4)). These complexes were characterized by X-ray diffraction, laser desorption/ionization time of flight mass spectrometry, and, in the case of Sm and Yb, multinuclear NMR spectroscopy, showing the influence of the ansa-bridge on solution and solid-state structures compared to previously reported unbridged metallocenes. Furthermore, the luminescence properties of the Eu ansa complex 3 were studied in solution and the solid state, revealing significant differences with the known octa- and deca-phenyleuropocenes, [Eu(C5Ph4H)2(dme)] and [Eu(C5Ph5)2].
Collapse
Affiliation(s)
- Angus C G Shephard
- College of Science and Engineering, James Cook University, Townsville 4811, Australia
| | - Aymeric Delon
- College of Science and Engineering, James Cook University, Townsville 4811, Australia
- Université de Reims Champagne-Ardenne, ICMR, UMR 7312, Reims 56187, France
| | - Sylviane Chevreux
- Université de Reims Champagne-Ardenne, ICMR, UMR 7312, Reims 56187, France
| | - Agathe Martinez
- Université de Reims Champagne-Ardenne, ICMR, UMR 7312, Reims 56187, France
| | - Zhifang Guo
- College of Science and Engineering, James Cook University, Townsville 4811, Australia
| | - Glen B Deacon
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Gilles Lemercier
- Université de Reims Champagne-Ardenne, ICMR, UMR 7312, Reims 56187, France
| | - Nathan McClenaghan
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, Talence F-33400, France
| | | | - Peter C Junk
- College of Science and Engineering, James Cook University, Townsville 4811, Australia
| | - Florian Jaroschik
- ICGM, Université Montpellier, CNRS, ENSCM, Montpellier 34090, France
| |
Collapse
|
3
|
Jain A, Karmakar H, Roesky PW, Panda TK. Role of Bis(phosphinimino)methanides as Universal Ligands in the Coordination Sphere of Metals across the Periodic Table. Chem Rev 2023. [PMID: 38048165 DOI: 10.1021/acs.chemrev.3c00336] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/06/2023]
Abstract
The coordination chemistry of bis(phosphinimino)methanide ligands is widespread and accompanies a large number of metal ions in the periodic table ranging from lithium to neptunium. This unique class of ligand systems show copious coordination chemistry with the main-group, transition, rare-earth, and actinide metals and are considered to be among the most attractive ligand systems to researchers. The bis(phosphinimino)methanide metal complexes offer an extensive range of applications in various fields and have been demonstrated as one of the universal ligand systems to stabilize the metal ions in not only their usual but also their unusual oxidation states. The main-group and transition metal chemistry using bis(phosphinimino)methanides as ligands was last updated almost a decade ago. In this review, we provide a comprehensive overview of various state-of-the-art bis(phosphinimino)methanide-supported metal complexes by dealing with their synthesis, characterization, reactivity, and catalytic studies which were not included in the last critical reviews.
Collapse
Affiliation(s)
- Archana Jain
- Department of Physics and Chemistry, Mahatma Gandhi Institute of Technology (MGIT), Gandipet-500075, Hyderabad, Telangana, India
| | - Himadri Karmakar
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi-502284, Sangareddy, Telangana, India
| | - Peter W Roesky
- Institut für Anorganische Chemie, Karlsruher Institut für Technologie (KIT), Engesserstr. 15 Geb. 30.45, 76131 Karlsruhe, Germany
| | - Tarun K Panda
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi-502284, Sangareddy, Telangana, India
| |
Collapse
|
4
|
Klementyeva SV, Woern K, Schrenk C, Zhang M, Khusniyarov MM, Schnepf A. [(thf) 5Ln(Ge 9{Si(SiMe 3) 3} 2)] (Ln = Eu, Sm, Yb): Capping Metalloid Germanium Cluster with Lanthanides. Inorg Chem 2023; 62:5614-5621. [PMID: 36967670 DOI: 10.1021/acs.inorgchem.3c00165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
Abstract
We report the synthesis of three neutral complexes with different coordination modes of a di-silylated metalloid germanium cluster to divalent lanthanides [(thf)5Ln(ηn-Ge9(Hyp)2)] (Ln = Yb (1, n = 1); Eu (2, n = 2, 3), Sm (3, n = 2, 3); Hyp = Si(SiMe3)3) by the salt metathesis of LnI2 with K2[Ge9(Hyp)2] in THF. The complexes were characterized by elemental analysis, nuclear magnetic resonance and UV-vis-NIR spectroscopy, and single-crystal X-ray diffraction. In thf solution, the formation of contact or solvate-separated ion pairs depending on the concentration is assumed. Compound 2 exhibits a blue luminescence typical for Eu2+. The solid-state magnetic measurements of compounds 2 and 3 confirm the presence of divalent europium and samarium, respectively.
Collapse
|
5
|
Synthesis and luminescent properties of new molecular compounds of divalent lanthanides LnCl2∙0.5H2O (Ln = Yb, Sm, Tm, and Eu). J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2023.114559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
|
6
|
Rare Earth Complexes of Europium(II) and Substituted Bis(pyrazolyl)borates with High Photoluminescence Efficiency. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27228053. [PMID: 36432156 PMCID: PMC9694868 DOI: 10.3390/molecules27228053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 11/14/2022] [Accepted: 11/17/2022] [Indexed: 11/22/2022]
Abstract
Rare earth europium(II) complexes based on d-f transition luminescence have characteristics of broad emission spectra, tunable emission colors and short excited state lifetimes, showing great potential in display, lighting and other fields. In this work, four complexes of Eu(II) and bis(pyrazolyl)borate ligands, where pyrazolyl stands for pyrazolyl, 3-methylpyrazolyl, 3,5-dimethylpyrazolyl or 3-trifluoromethylpyrazole, were designed and synthesized. Due to the varied steric hindrance of the ligands, different numbers of solvent molecules (tetrahydrofuran) are participated to saturate the coordination structure. These complexes showed blue-green to yellow emissions with maximum wavelength in the range of 490-560 nm, and short excited state lifetimes of 30-540 ns. Among them, the highest photoluminescence quantum yield can reach 100%. In addition, when the complexes were heated under vacuum or nitrogen atmosphere, they finally transformed into the complexes of Eu(II) and corresponding tri(pyrazolyl)borate ligands and sublimated away.
Collapse
|
7
|
Widemann M, Aicher FSW, Bonath M, Eichele K, Maichle‐Mössmer C, Schubert H, Sirsch P, Anwander R, Wesemann L. Molecular Ln(III)−H−E(II) Linkages (Ln=Y, Lu; E=Ge, Sn, Pb). Chemistry 2022; 28:e202201032. [PMID: 35620817 PMCID: PMC9541956 DOI: 10.1002/chem.202201032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Indexed: 11/09/2022]
Affiliation(s)
- Max Widemann
- Institut für Anorganische Chemie Eberhard Karls Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Frederik S. W. Aicher
- Institut für Anorganische Chemie Eberhard Karls Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Martin Bonath
- Institut für Anorganische Chemie Eberhard Karls Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Klaus Eichele
- Institut für Anorganische Chemie Eberhard Karls Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Cäcilia Maichle‐Mössmer
- Institut für Anorganische Chemie Eberhard Karls Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Hartmut Schubert
- Institut für Anorganische Chemie Eberhard Karls Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Peter Sirsch
- Institut für Anorganische Chemie Eberhard Karls Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Reiner Anwander
- Institut für Anorganische Chemie Eberhard Karls Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Lars Wesemann
- Institut für Anorganische Chemie Eberhard Karls Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
| |
Collapse
|
8
|
Abstract
The number of rare earth (RE) starting materials used in synthesis is staggering, ranging from simple binary metal-halide salts to borohydrides and "designer reagents" such as alkyl and organoaluminate complexes. This review collates the most important starting materials used in RE synthetic chemistry, including essential information on their preparations and uses in modern synthetic methodologies. The review is divided by starting material category and supporting ligands (i.e., metals as synthetic precursors, halides, borohydrides, nitrogen donors, oxygen donors, triflates, and organometallic reagents), and in each section relevant synthetic methodologies and applications are discussed.
Collapse
Affiliation(s)
- Fabrizio Ortu
- School of Chemistry, University of Leicester, LE1 7RH Leicester, U.K.
| |
Collapse
|
9
|
Comanescu C. Complex Metal Borohydrides: From Laboratory Oddities to Prime Candidates in Energy Storage Applications. MATERIALS 2022; 15:ma15062286. [PMID: 35329738 PMCID: PMC8949998 DOI: 10.3390/ma15062286] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 02/26/2022] [Accepted: 03/11/2022] [Indexed: 01/27/2023]
Abstract
Despite being the lightest element in the periodic table, hydrogen poses many risks regarding its production, storage, and transport, but it is also the one element promising pollution-free energy for the planet, energy reliability, and sustainability. Development of such novel materials conveying a hydrogen source face stringent scrutiny from both a scientific and a safety point of view: they are required to have a high hydrogen wt.% storage capacity, must store hydrogen in a safe manner (i.e., by chemically binding it), and should exhibit controlled, and preferably rapid, absorption–desorption kinetics. Even the most advanced composites today face the difficult task of overcoming the harsh re-hydrogenation conditions (elevated temperature, high hydrogen pressure). Traditionally, the most utilized materials have been RMH (reactive metal hydrides) and complex metal borohydrides M(BH4)x (M: main group or transition metal; x: valence of M), often along with metal amides or various additives serving as catalysts (Pd2+, Ti4+ etc.). Through destabilization (kinetic or thermodynamic), M(BH4)x can effectively lower their dehydrogenation enthalpy, providing for a faster reaction occurring at a lower temperature onset. The present review summarizes the recent scientific results on various metal borohydrides, aiming to present the current state-of-the-art on such hydrogen storage materials, while trying to analyze the pros and cons of each material regarding its thermodynamic and kinetic behavior in hydrogenation studies.
Collapse
Affiliation(s)
- Cezar Comanescu
- National Institute of Materials Physics, 405A Atomiștilor St., 077125 Magurele, Romania;
- Inorganic Chemistry Department, Politehnica University of Bucharest, 1 Polizu St., 011061 Bucharest, Romania
- Faculty of Physics, University of Bucharest, 405, Atomiștilor St., 077125 Magurele, Romania
| |
Collapse
|
10
|
Diaz-Rodriguez RM, Gálico DA, Chartrand D, Suturina EA, Murugesu M. Toward Opto-Structural Correlation to Investigate Luminescence Thermometry in an Organometallic Eu(II) Complex. J Am Chem Soc 2022; 144:912-921. [PMID: 34989573 DOI: 10.1021/jacs.1c11076] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Lanthanide-based luminescent materials have unique properties and are well-studied for many potential applications. In particular, the characteristic 5d → 4f emission of divalent lanthanide ions such as EuII allows for tunability of the emissive properties via modulation of the coordination environment. We report the synthesis and photoluminescence investigation of pentamethylcyclopentadienyleuropium(II) tetrahydroborate bis(tetrahydrofuran) dimer (1), the first example of an organometallic, discrete molecular EuII band-shift luminescence thermometer. Complex 1 exhibits an absolute sensitivity of 8.2 cm-1 K-1 at 320 K, the highest thus far observed for a lanthanide-based band-shift thermometer. Opto-structural correlation via variable-temperature single-crystal X-ray diffraction and fluorescence spectroscopy allows rationalization of the remarkable thermometric luminescence of complex 1 and reveals the significant potential of molecular EuII compounds in luminescence thermometry.
Collapse
Affiliation(s)
- Roberto M Diaz-Rodriguez
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Diogo A Gálico
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Daniel Chartrand
- Department of Chemistry, Université de Montréal, Montréal, Quebec H3T 1J4, Canada
| | - Elizaveta A Suturina
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom
| | - Muralee Murugesu
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| |
Collapse
|
11
|
Yan W, Li T, Cai Z, Qi H, Guo R, Huo P, Liu Z, Bian Z. Systematic tuning of the emission colors and redox potential of Eu( ii)-containing cryptates by changing the N/O ratio of cryptands. Inorg Chem Front 2022. [DOI: 10.1039/d2qi01216b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The λmax, excited-state lifetimes, and the anodic peak potential of Eu2+/Eu3+ for Eu(ii)-containing cryptates depend linearly on the number of N atoms.
Collapse
Affiliation(s)
- Wenchao Yan
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Tingzhou Li
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Zelun Cai
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Hao Qi
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Ruoyao Guo
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Peihao Huo
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Zhiwei Liu
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Zuqiang Bian
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| |
Collapse
|
12
|
Ferraro V, Castro J, Trave E, Bortoluzzi M. Preparation, reactivity and photoluminescence of copper(I) borohydride complexes with bis[(2-diphenylphosphino)phenyl] ether as chelating ligand. J Organomet Chem 2022. [DOI: 10.1016/j.jorganchem.2021.122171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
13
|
Ilichev VA, Silantyeva LI, Rogozhin AF, Yablonskiy AN, Andreev BA, Rumyantsev RV, Fukin GK, Bochkarev MN. Luminescence thermochromism in novel mixed Eu(II)-Cu(I) iodide. Dalton Trans 2021; 50:14244-14251. [PMID: 34553198 DOI: 10.1039/d1dt02384e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new mixed Eu(II)-Cu(I) iodide [Eu(DME)4][Cu2I4] (1) was synthesized by the reaction of an organosulphide salt of Eu(II) and CuI in DME media. X-ray analysis revealed that 1 is an ate-complex consisting of Eu(DME)4 dications and tetraiododicuprate dianions. Upon UV light excitation (λ = 365 nm), the compound exhibits intense double-peaked photoluminescence (PL) at 445 and 500 nm. The relative intensity of these peaks changes dramatically when the temperature changes in the range of 180-250 K. To understand the nature of the found PL thermochromism, the structure and time-resolved PL of 1 were studied at various temperatures. The time-resolved PL studies of 1 at various temperatures revealed the presence of two luminescent centers which are excited by the capture of an electron from the conduction band. The ratio of intensities at 445 and 500 nm (R = I445/I500) in the PL spectra of 1 changes by almost two orders of magnitude and the relative sensitivity S (S = (∂R/∂T)/R) exceeds 5% per K in the range of 190-245 K that makes this compound a promising luminescent thermometer for the range where ammonia exists in a liquid state.
Collapse
Affiliation(s)
- Vasily A Ilichev
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, Tropinina 49, 603950 Nizhny Novgorod, Russian Federation.
| | - Liubov I Silantyeva
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, Tropinina 49, 603950 Nizhny Novgorod, Russian Federation.
| | - Anton F Rogozhin
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, Tropinina 49, 603950 Nizhny Novgorod, Russian Federation.
| | - Artem N Yablonskiy
- Institute for Physics of Microstructures of Russian Academy of Sciences, 7 ul. Akademicheskaya, 603950 Nizhny Novgorod, Russian Federation
| | - Boris A Andreev
- Institute for Physics of Microstructures of Russian Academy of Sciences, 7 ul. Akademicheskaya, 603950 Nizhny Novgorod, Russian Federation
| | - Roman V Rumyantsev
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, Tropinina 49, 603950 Nizhny Novgorod, Russian Federation.
| | - Georgy K Fukin
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, Tropinina 49, 603950 Nizhny Novgorod, Russian Federation.
| | - Mikhail N Bochkarev
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, Tropinina 49, 603950 Nizhny Novgorod, Russian Federation.
| |
Collapse
|
14
|
Zhang H, Gao B, Huang G, Li D, Pang X. Highly Selective Polymerization of Rac-Lactide Initiated by Salen Aluminum Complex Bearing an Adamantane Derivative. J COORD CHEM 2021. [DOI: 10.1080/00958972.2021.1918683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Haotian Zhang
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, China
| | - Bo Gao
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, China
| | - Guiqiu Huang
- College of Petroleum and Chemical Engineering, Beibu Gulf University, Qinzhou, People’s Republic of China
| | - Dongni Li
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, China
- China–Japan Union Hospital of Jilin University, Jilin University, Changchun, China
| | - Xuan Pang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
| |
Collapse
|
15
|
Grinderslev JB, Jensen TR. Trends in the Series of Ammine Rare-Earth-Metal Borohydrides: Relating Structural and Thermal Properties. Inorg Chem 2021; 60:2573-2589. [PMID: 33499595 DOI: 10.1021/acs.inorgchem.0c03464] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ammine metal borohydrides display extreme structural and compositional diversity and show potential applications for solid-state hydrogen and ammonia storage and as solid-state electrolytes. Thirty-two new compounds are reported in this work, and trends in the full series of ammine rare-earth-metal borohydrides are discussed. The majority of the rare-earth metals (RE) form trivalent RE(BH4)3·xNH3 (x = 7-1) compounds, which possess an intriguing crystal chemistry changing with the number of ammonia ligands, varying from structures built from complex ions (x = 5-7), to molecular structures (x = 3, 4), one-dimensional chains (x = 2), and structures built from two-dimensional layers (x = 1). Divalent RE(BH4)2·xNH3 (x = 4, 2, 1) compounds are observed for RE2+ = Sm, Eu, Yb, with structures varying from molecular structures (x = 4) to two-dimensional layered (x = 2, 1) and three-dimensional structures (Yb(BH4)2·NH3). The crystal structure and composition of the compounds depend on the volume of the rare-earth ion. In all structures, NH3 coordinates to the metal, while BH4- has a more flexible coordination and is observed as a bridging and terminal ligand and as a counterion. RE(BH4)3·xNH3 (x = 7-5, 4) releases NH3 stepwise during thermal treatment, while mainly H2 is released for x ≤ 3. In contrast, only NH3 is released from RE(BH4)2·xNH3 due to the lower charge density on the RE2+ ion and higher stability of RE(BH4)2. The thermal stability of RE(BH4)3·xNH3 increase with increasing cation charge density for x = 5, 7, while it decreases for x = 4, 6. For x = 3, the thermal stability decreases with increasing charge density, due to the destabilization of the BH4- group, making it more reactive toward NH3. This research provides a large number of novel compounds and new insight into trends in the crystal chemistry of ammine metal borohydrides and reveals a correlation between the local metal coordination and the thermal stability.
Collapse
Affiliation(s)
- Jakob B Grinderslev
- Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus C, Denmark
| | - Torben R Jensen
- Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus C, Denmark
| |
Collapse
|
16
|
Grinderslev JB, Andersson MS, Trump BA, Zhou W, Udovic TJ, Karlsson M, Jensen TR. Neutron Scattering Investigations of the Global and Local Structures of Ammine Yttrium Borohydrides. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2021; 125:10.1021/acs.jpcc.1c03629. [PMID: 38487813 PMCID: PMC10938370 DOI: 10.1021/acs.jpcc.1c03629] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/17/2024]
Abstract
Complex metal hydrides are a fascinating and continuously expanding class of materials with many properties relevant for solid-state hydrogen and ammonia storage and solid-state electrolytes. The crystal structures are often investigated using powder X-ray diffraction (PXD), which can be ambiguous. Here, we revisit the crystal structure of Y(11BD4)3·3ND3 with the use of neutron diffraction, which, in comparison to previous PXD studies, provides accurate information about the D positions in the compound. Upon cooling to 10 K, the compound underwent a polymorphic transition, and a new monoclinic low-temperature polymorph denoted as α-Y(11BD4)3·3ND3 was discovered. Furthermore, the series of Y(11BH4)3·xNH3 (x = 0, 3, and 7) were also investigated with inelastic neutron scattering and infrared spectroscopy techniques, which provided information of the local coordination environment of the 11BH4- and NH3 groups and unique insights into the hydrogen dynamics. Partial deuteration using ND3 in Y(11BH4)3·xND3 (x = 3 and 7) allowed for an unambiguous assignment of the vibrational bands corresponding to the NH3 and 11BH4- in Y(11BH4)3·xNH3, due to the much larger neutron scattering cross section of H compared to D. The vibrational spectra of Y(11BH4)3·xNH3 could roughly be divided into three regions: (i) below 55 meV, containing mainly 11BH4- librational motions, (ii) 55-130 meV, containing mainly NH3 librational motions, and (iii) above 130 meV, containing 11B-H and N-H bending and stretching motions.
Collapse
Affiliation(s)
- Jakob B Grinderslev
- Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Aarhus 8000, Denmark
| | - Mikael S Andersson
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg SE-412 96, Sweden
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
| | - Benjamin A Trump
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
| | - Wei Zhou
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
| | - Terrence J Udovic
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115, United States
| | - Maths Karlsson
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg SE-412 96, Sweden
| | - Torben R Jensen
- Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Aarhus 8000, Denmark
| |
Collapse
|
17
|
Galimov DI, Yakupova SM, Vasilyuk KS, Sabirov DS, Bulgakov RG. Effect of coordination environment of Eu2+ ion on the 5d-4f luminescence of molecular compounds EuL2(THF) (L = Cl, Br, I, NO3, Ac, fod, tmhd, and acac; x = 0, 2). J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2020.112839] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
|
18
|
Abstract
Ammine metal borohydrides show large compositional and structural diversity, and have been proposed as candidates for solid-state ammonia and hydrogen storage as well as fast cationic conductors. Here, we report the synthesis method of ammine barium borohydrides, Ba(BH4)2·xNH3 (x = 1, 2). The two new compounds were investigated with time-resolved temperature-varied in situ synchrotron radiation powder X-ray diffraction, thermal analysis, infrared spectroscopy and photographic analysis. The compound Ba(BH4)2·2NH3 crystallizes in an orthorhombic unit cell with space group symmetry Pnc2, and is isostructural to Sr(BH4)2·2NH3, forming octahedral [Ba(NH3)2(BH4)4] complexes, which are connected into a two-dimensional layered structure, where the layers are interconnected by dihydrogen bonds, N–Hδ+⋯−δH–B. A new structure type is observed for Ba(BH4)2·NH3, which crystallizes in an orthorhombic unit cell with space group symmetry P212121, forming a three-dimensional framework structure of [Ba(NH3)(BH4)6] complexes. The structure is built from distorted hexagonal chains, where NH3 groups form dihydrogen bonds to the nearby BH4−-groups within the chain. Ba(BH4)2·2NH3 is unstable at room temperature and releases NH3 in two subsequent endothermic reactions with maxima at 49 and 117 °C, eventually reforming Ba(BH4)2. We demonstrate that the thermal stability and composition of the gas release for the ammine alkaline earth metal borohydrides can be correlated to the charge density of the metal cation, but are also influenced by other effects.
Collapse
|
19
|
Silantyeva LI, Ilichev VA, Shavyrin AS, Yablonskiy AN, Rumyantcev RV, Fukin GK, Bochkarev MN. Unexpected Findings in a Simple Metathesis Reaction of Europium and Ytterbium Diiodides with Perfluorinated Mercaptobenzothiazolates of Alkali Metals. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00334] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Liubov I. Silantyeva
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, Tropinina 49, 603950 Nizhny Novgorod, Russian Federation
| | - Vasily A. Ilichev
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, Tropinina 49, 603950 Nizhny Novgorod, Russian Federation
| | - Andrey S. Shavyrin
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, Tropinina 49, 603950 Nizhny Novgorod, Russian Federation
| | - Artem N. Yablonskiy
- Institute for Physics of Microstructures of Russian Academy of Sciences, 7 ul. Akademicheskaya, 603950 Nizhny Novgorod, Russian Federation
| | - Roman V. Rumyantcev
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, Tropinina 49, 603950 Nizhny Novgorod, Russian Federation
| | - Georgy K. Fukin
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, Tropinina 49, 603950 Nizhny Novgorod, Russian Federation
| | - Mikhail N. Bochkarev
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, Tropinina 49, 603950 Nizhny Novgorod, Russian Federation
| |
Collapse
|
20
|
Grinderslev JB, Jepsen LH, Lee YS, Møller KT, Cho YW, Černý R, Jensen TR. Structural Diversity and Trends in Properties of an Array of Hydrogen-Rich Ammonium Metal Borohydrides. Inorg Chem 2020; 59:12733-12747. [PMID: 32799455 DOI: 10.1021/acs.inorgchem.0c01797] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Metal borohydrides are a fascinating and continuously expanding class of materials, showing promising applications within many different fields of research. This study presents 17 derivatives of the hydrogen-rich ammonium borohydride, NH4BH4, which all exhibit high gravimetric hydrogen densities (>9.2 wt % of H2). A detailed insight into the crystal structures combining X-ray diffraction and density functional theory calculations exposes an intriguing structural variety ranging from three-dimensional (3D) frameworks, 2D-layered, and 1D-chainlike structures to structures built from isolated complex anions, in all cases containing NH4+ countercations. Dihydrogen interactions between complex NH4+ and BH4- ions contribute to the structural diversity and flexibility, while inducing an inherent instability facilitating hydrogen release. The thermal stability of the ammonium metal borohydrides, as a function of a range of structural properties, is analyzed in detail. The Pauling electronegativity of the metal, the structural dimensionality, the dihydrogen bond length, the relative amount of NH4+ to BH4-, and the nearest coordination sphere of NH4+ are among the most important factors. Hydrogen release usually occurs in three steps, involving new intermediate compounds, observed as crystalline, polymeric, and amorphous materials. This research provides new opportunities for the design and tailoring of novel functional materials with interesting properties.
Collapse
Affiliation(s)
- Jakob B Grinderslev
- Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus C, Denmark
| | - Lars H Jepsen
- Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus C, Denmark
| | - Young-Su Lee
- Center for Energy Materials Research, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Kasper T Møller
- Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus C, Denmark.,Department of Imaging and Applied Physics, Fuels and Energy Technology Institute, Curtin University, GPO Box U1987, Perth 6845, Western Australia, Australia
| | - Young Whan Cho
- Center for Energy Materials Research, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Radovan Černý
- Laboratory of Crystallography, DQMP, University of Geneva, 1211 Geneva, Switzerland
| | - Torben R Jensen
- Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus C, Denmark
| |
Collapse
|
21
|
Basal LA, Kajjam AB, Bailey MD, Allen MJ. Systematic Tuning of the Optical Properties of Discrete Complexes of Eu II in Solution Using Counterions and Solvents. Inorg Chem 2020; 59:9476-9480. [PMID: 32618468 DOI: 10.1021/acs.inorgchem.0c01516] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
We describe a systematic study of the influence of halides and solvents on the optical properties of EuII-containing complexes in solution starting from well-defined crystalline precursors. Anionic halides, chloride and bromide, blue-shift the spectroscopic properties of EuII, whereas neutral ligands, methanol and acetonitrile, cause a red shift. This system provides evidence that EuII has a stronger affinity for chloride, and to some extent bromide, relative to acetonitrile but not methanol. We also describe a simple procedure using an ion-exchange resin for the exchange of iodide counterions to hexafluorophosphate. These findings are a step toward designing ligands that can tune the optical properties of EuII-containing complexes for solution-based applications.
Collapse
Affiliation(s)
- Lina A Basal
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States.,Department of Chemistry and Biochemistry, Colorado College, 1040 North Nevada Avenue, Colorado Springs, Colorado 80903, United States
| | - Aravind B Kajjam
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
| | - Matthew D Bailey
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
| | - Matthew J Allen
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
| |
Collapse
|
22
|
A Review of the MSCA ITN ECOSTORE—Novel Complex Metal Hydrides for Efficient and Compact Storage of Renewable Energy as Hydrogen and Electricity. INORGANICS 2020. [DOI: 10.3390/inorganics8030017] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Hydrogen as an energy carrier is very versatile in energy storage applications. Developments in novel, sustainable technologies towards a CO2-free society are needed and the exploration of all-solid-state batteries (ASSBs) as well as solid-state hydrogen storage applications based on metal hydrides can provide solutions for such technologies. However, there are still many technical challenges for both hydrogen storage material and ASSBs related to designing low-cost materials with low-environmental impact. The current materials considered for all-solid-state batteries should have high conductivities for Na+, Mg2+ and Ca2+, while Al3+-based compounds are often marginalised due to the lack of suitable electrode and electrolyte materials. In hydrogen storage materials, the sluggish kinetic behaviour of solid-state hydride materials is one of the key constraints that limit their practical uses. Therefore, it is necessary to overcome the kinetic issues of hydride materials before discussing and considering them on the system level. This review summarizes the achievements of the Marie Skłodowska-Curie Actions (MSCA) innovative training network (ITN) ECOSTORE, the aim of which was the investigation of different aspects of (complex) metal hydride materials. Advances in battery and hydrogen storage materials for the efficient and compact storage of renewable energy production are discussed.
Collapse
|
23
|
Bhattacharjee J, Harinath A, Sarkar A, Panda TK. Alkaline Earth Metal-Mediated Highly Iso-selective Ring-Opening Polymerization of rac-Lactide. Chem Asian J 2020; 15:860-866. [PMID: 32022475 DOI: 10.1002/asia.201901751] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 01/20/2020] [Indexed: 11/06/2022]
Abstract
Alkaline earth (Ae) metal complexes of the aminophosphine borane ligand are highly active and iso-selective catalysts for the ring-opening polymerization (ROP) of rac-lactide (LA). The polymerization reactions are well controlled and produce polylactides with molecular weights that are precise and narrowly distributed. Kinetic studies reveal that the ROP of rac-LA catalyzed by all Ae metal complexes had a first-order dependency on LA concentration as well as catalyst concentration. A plausible reaction mechanism for Ae metal complex-mediated ROP of rac-LA is discussed, based on controlled kinetic experiments and molecular chain mobility.
Collapse
Affiliation(s)
- Jayeeta Bhattacharjee
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502285, Sangareddy, Telangana, India
| | - Adimulam Harinath
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502285, Sangareddy, Telangana, India
| | - Alok Sarkar
- Momentive Performance Materials Pvt. Ltd., Bangalore, 560 100, India
| | - Tarun K Panda
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502285, Sangareddy, Telangana, India
| |
Collapse
|
24
|
Jenks TC, Kuda-Wedagedara ANW, Bailey MD, Ward CL, Allen MJ. Spectroscopic and Electrochemical Trends in Divalent Lanthanides through Modulation of Coordination Environment. Inorg Chem 2020; 59:2613-2620. [PMID: 31999439 DOI: 10.1021/acs.inorgchem.0c00136] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Due to the importance of both visible-light luminescence and lanthanides in modern society, the influence of the ligand environment on complexes of YbII were studied and compared with analogous complexes of EuII. Four ligands with systematically varied electronic and steric characteristics were used to probe the coordination environment and electronic and redox properties of the corresponding YbII-containing complexes. Strong-field nitrogenous donors gave rise to bathochromic shifts, leading to visible-light absorption by YbII. Trends in properties across the series of YbII-containing complexes were compared to trends reported for the analogous EuII-containing complexes, revealing the translatability of coordination environment effects across the divalent lanthanide series. These studies provide valuable information regarding the behavior of small and medium-sized divalent lanthanides outside of the solid state.
Collapse
|
25
|
Khristolyubov DO, Lyubov DM, Shavyrin AS, Cherkasov AV, Fukin GK, Trifonov AA. Ln( ii) and Ca( ii) NC sp3N pincer type diarylmethanido complexes – promising catalysts for C–C and C–E (E = Si, P, N, S) bond formation. Inorg Chem Front 2020. [DOI: 10.1039/d0qi00369g] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The first examples of Ln(ii) (Ln = Yb, Sm) and Ca [NCsp3N] pincer type diarylmethanido complexes were synthesized and successfully used as efficient and selective precatalyst for intermolecular C–C and C–E bond formation.
Collapse
Affiliation(s)
| | - Dmitry M. Lyubov
- Institute of Organometallic Chemistry of Russian Academy of Sciences
- Nizhny Novgorod
- Russia
| | - Andrey S. Shavyrin
- Institute of Organometallic Chemistry of Russian Academy of Sciences
- Nizhny Novgorod
- Russia
| | - Anton V. Cherkasov
- Institute of Organometallic Chemistry of Russian Academy of Sciences
- Nizhny Novgorod
- Russia
| | - Georgy K. Fukin
- Institute of Organometallic Chemistry of Russian Academy of Sciences
- Nizhny Novgorod
- Russia
| | - Alexander A. Trifonov
- Institute of Organometallic Chemistry of Russian Academy of Sciences
- Nizhny Novgorod
- Russia
- Institute of Organoelement Compounds of Russian Academy of Sciences
- Moscow
| |
Collapse
|
26
|
Li D, Gao B, Duan Q. Preparation of star-shaped functionalized polylactides by metal porphyrin complexes as both catalysts and cocatalysts. J PORPHYR PHTHALOCYA 2019. [DOI: 10.1142/s1088424619500603] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Several aluminum porphyrin complexes as catalysts and a copper porphyrin complex as a cocatalyst were prepared. These complexes were characterized by 1H NMR and elemental analysis. These complexes are used for L-lactide polymerization. The kinetic data of the polymerization using complex 2 as catalyst revealed that the polymeric rates were first-ordered in both the monomer and catalyst. There is a linear relationship between lactide conversion and the number-averaged molecular weight of PLA.
Collapse
Affiliation(s)
- Dongni Li
- School of Materials Science and Engineering, Changchun University of Science and Technology, 7989 Weixing Road, Changchun 130022, China
- Department of Blood Transfusion, China–Japan Union Hospital of Jilin University, Jilin University, 126 Xiantai Street, Changchun, 130033, China
| | - Bo Gao
- School of Materials Science and Engineering, Changchun University of Science and Technology, 7989 Weixing Road, Changchun 130022, China
- Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun 130022, China
| | - Qian Duan
- School of Materials Science and Engineering, Changchun University of Science and Technology, 7989 Weixing Road, Changchun 130022, China
- Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun 130022, China
| |
Collapse
|
27
|
Grinderslev JB, Møller KT, Bremholm M, Jensen TR. Trends in Synthesis, Crystal Structure, and Thermal and Magnetic Properties of Rare-Earth Metal Borohydrides. Inorg Chem 2019; 58:5503-5517. [PMID: 31013080 DOI: 10.1021/acs.inorgchem.8b03258] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Synthesis, crystal structures, and thermal and magnetic properties of the complete series of halide-free rare-earth (RE) metal borohydrides are presented. A new synthesis method provides high yield and high purity products. Fifteen new metal borohydride structures are reported. The trends in crystal structures, thermal behavior, and magnetic properties for the entire series of RE(BH4) x are compared and discussed. The RE(BH4) x possess a very rich crystal chemistry, dependent on the oxidation state and the ionic size of the rare-earth ion. Due to the lanthanide contraction, there is a significant decrease in the volume of the RE3+-ion with increasing atomic number, which correlates linearly with the unit cell volume of the α- and β-RE(BH4)3 polymorphs and the solvated complexes α-RE(BH4)3·S(CH3)2. The thermal analysis reveals a one-step decomposition pathway in the temperature range from 247 to 277 °C for all RE(BH4)3 except Lu(BH4)3, which follows a three-step decomposition pathway. In contrast, the RE(BH4)2 decompose at higher temperatures in the range 306 to 390 °C due to lower charge density on the rare-earth ion. The RE(BH4)3 show increasing stability with increasing Pauling electronegativity, which contradicts other main group and transition metal borohydrides. The majority of the compounds follow Curie-Weiss paramagnetic behavior down to 3 K with weak antiferromagnetic interactions and magnetic moments in accord with those of isolated 4f ions. Some of the RE(BH4) x display varying degrees of temperature-dependent magnetic moments due to low-lying excited stated induced by crystal field effects. Additionally, a weak antiferromagnetic ordering is observed in Gd(BH4)3, indicating superexchange through a borohydride group.
Collapse
Affiliation(s)
- Jakob B Grinderslev
- Center for Materials Crystallography, Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry , Aarhus University , Langelandsgade 140 , 8000 Aarhus C , Denmark
| | - Kasper T Møller
- Center for Materials Crystallography, Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry , Aarhus University , Langelandsgade 140 , 8000 Aarhus C , Denmark
| | - Martin Bremholm
- Center for Materials Crystallography, Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry , Aarhus University , Langelandsgade 140 , 8000 Aarhus C , Denmark
| | - Torben R Jensen
- Center for Materials Crystallography, Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry , Aarhus University , Langelandsgade 140 , 8000 Aarhus C , Denmark
| |
Collapse
|
28
|
Li D, Gao B, Duan Q. Synthesis of biodegradable and biorenewable polylactides initiated by aluminum complexes bearing m-xylylenediamine derivatives via the ring-opening polymerization of lactides. NEW J CHEM 2019. [DOI: 10.1039/c9nj01268k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Aluminum complexes derived from m-xylylenediamine were synthesized and investigated as initiators for l-lactide and rac-lactide polymerization.
Collapse
Affiliation(s)
- Dongni Li
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- 7989 Weixing Road
- Changchun 130022
- China
| | - Bo Gao
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- 7989 Weixing Road
- Changchun 130022
- China
| | - Qian Duan
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- 7989 Weixing Road
- Changchun 130022
- China
| |
Collapse
|
29
|
Simler T, Feuerstein TJ, Yadav R, Gamer MT, Roesky PW. Access to divalent lanthanide NHC complexes by redox-transmetallation from silver and CO 2 insertion reactions. Chem Commun (Camb) 2018; 55:222-225. [PMID: 30525155 DOI: 10.1039/c8cc08120d] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Through a redox-transmetallation procedure, divalent NHC-LnII (NHC = N-heterocyclic carbene; Ln = Eu, Yb) complexes were obtained from the corresponding NHC-AgI. The lability of the NHC-LnII bond was investigated and treatment with CO2 led to insertion reactions without oxidation of the metal centre. The EuII complex [EuI2(IMes)(THF)3] (IMes = 1,3-dimesitylimidazol-2-ylidene) exhibits photoluminescence with a quantum yield reaching 53%.
Collapse
Affiliation(s)
- Thomas Simler
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstr. 15, 76131 Karlsruhe, Germany.
| | | | | | | | | |
Collapse
|
30
|
Affiliation(s)
- Nathalie Kunkel
- Chair for Inorganic Chemistry with Focus on Novel Materials; Department of Chemistry; Technical University of Munich; Lichtenbergstr. 4 85747 Garching Germany
| | - Thomas Wylezich
- Chair for Inorganic Chemistry with Focus on Novel Materials; Department of Chemistry; Technical University of Munich; Lichtenbergstr. 4 85747 Garching Germany
| |
Collapse
|
31
|
Bestgen S, Schoo C, Neumeier BL, Feuerstein TJ, Zovko C, Köppe R, Feldmann C, Roesky PW. Intensely Photoluminescent Diamidophosphines of the Alkaline-Earth Metals, Aluminum, and Zinc. Angew Chem Int Ed Engl 2018; 57:14265-14269. [PMID: 30040153 DOI: 10.1002/anie.201806943] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Indexed: 11/09/2022]
Abstract
The positively charged and weakly polarizable s-block metals commonly do not usually have phosphine ligands in molecular complexes. Herein, we report mono- and dinuclear small diamidophosphine complexes of the alkaline-earth metals Mg, Ca, and Sr, which were prepared from simple precursors and a phosphine-functionalized diamine ligand N,N-bis(2-(diphenyl-phosphino)phenyl)ethane-1,2-diamine (PNHNHP). The alkaline-earth metal based complexes [(PNNP)Mg]2 and [(PNNP)M(thf)3 ] (M=Ca, Sr), exhibit unusual coordination spheres and show bright fluorescence, both in the solid state and in solution. For comparison, the even stronger luminescent Al and Zn complexes [(PNNP)Zn]2 and [(PNNP)AlCl] were prepared. Emission lifetimes in the nanosecond range and high photoluminescence quantum yields up to 93 % are observed at room temperature.
Collapse
Affiliation(s)
- Sebastian Bestgen
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, 76131, Karlsruhe, Germany.,Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK
| | - Christoph Schoo
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, 76131, Karlsruhe, Germany
| | - B Lilli Neumeier
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, 76131, Karlsruhe, Germany
| | - Thomas J Feuerstein
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, 76131, Karlsruhe, Germany
| | - Christina Zovko
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, 76131, Karlsruhe, Germany
| | - Ralf Köppe
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, 76131, Karlsruhe, Germany
| | - Claus Feldmann
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, 76131, Karlsruhe, Germany
| | - Peter W Roesky
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, 76131, Karlsruhe, Germany
| |
Collapse
|
32
|
Bestgen S, Schoo C, Neumeier BL, Feuerstein TJ, Zovko C, Köppe R, Feldmann C, Roesky PW. Photolumineszierende Diamidophosphankomplexe der Erdalkalimetalle, des Aluminiums und des Zinks. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201806943] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Sebastian Bestgen
- Institut für Anorganische Chemie; Karlsruher Institut für Technologie (KIT); Engesserstraße 15 76131 Karlsruhe Germany
- Department of Chemistry; Chemistry Research Laboratory; University of Oxford; 12 Mansfield Road Oxford OX1 3TA UK
| | - Christoph Schoo
- Institut für Anorganische Chemie; Karlsruher Institut für Technologie (KIT); Engesserstraße 15 76131 Karlsruhe Germany
| | - B. Lilli Neumeier
- Institut für Anorganische Chemie; Karlsruher Institut für Technologie (KIT); Engesserstraße 15 76131 Karlsruhe Germany
| | - Thomas J. Feuerstein
- Institut für Anorganische Chemie; Karlsruher Institut für Technologie (KIT); Engesserstraße 15 76131 Karlsruhe Germany
| | - Christina Zovko
- Institut für Anorganische Chemie; Karlsruher Institut für Technologie (KIT); Engesserstraße 15 76131 Karlsruhe Germany
| | - Ralf Köppe
- Institut für Anorganische Chemie; Karlsruher Institut für Technologie (KIT); Engesserstraße 15 76131 Karlsruhe Germany
| | - Claus Feldmann
- Institut für Anorganische Chemie; Karlsruher Institut für Technologie (KIT); Engesserstraße 15 76131 Karlsruhe Germany
| | - Peter W. Roesky
- Institut für Anorganische Chemie; Karlsruher Institut für Technologie (KIT); Engesserstraße 15 76131 Karlsruhe Germany
| |
Collapse
|
33
|
Richter B, Grinderslev JB, Møller KT, Paskevicius M, Jensen TR. From Metal Hydrides to Metal Borohydrides. Inorg Chem 2018; 57:10768-10780. [PMID: 30137973 DOI: 10.1021/acs.inorgchem.8b01398] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Commencing from metal hydrides, versatile synthesis, purification, and desolvation approaches are presented for a wide range of metal borohydrides and their solvates. An optimized and generalized synthesis method is provided for 11 different metal borohydrides, M(BH4) n, (M = Li, Na, Mg, Ca, Sr, Ba, Y, Nd, Sm, Gd, Yb), providing controlled access to more than 15 different polymorphs and in excess of 20 metal borohydride solvate complexes. Commercially unavailable metal hydrides (MH n, M = Sr, Ba, Y, Nd, Sm, Gd, Yb) are synthesized utilizing high pressure hydrogenation. For synthesis of metal borohydrides, all hydrides are mechanochemically activated prior to reaction with dimethylsulfide borane. A purification process is devised, alongside a complementary desolvation process for solvate complexes, yielding high purity products. An array of polymorphically pure metal borohydrides are synthesized in this manner, supporting the general applicability of this method. Additionally, new metal borohydrides, α-, α'- β-, γ-Yb(BH4)2, α-Nd(BH4)3 and new solvates Sr(BH4)2·1THF, Sm(BH4)2·1THF, Yb(BH4)2· xTHF, x = 1 or 2, Nd(BH4)3·1Me2S, Nd(BH4)3·1.5THF, Sm(BH4)3·1.5THF and Yb(BH4)3· xMe2S (" x" = unspecified), are presented here. Synthesis conditions are optimized individually for each metal, providing insight into reactivity and mechanistic concerns. The reaction follows a nucleophilic addition/hydride-transfer mechanism. Therefore, the reaction is most efficient for ionic and polar-covalent metal hydrides. The presented synthetic approaches are widely applicable, as demonstrated by permitting facile access to a large number of materials and by performing a scale-up synthesis of LiBH4.
Collapse
Affiliation(s)
- Bo Richter
- Center for Materials Crystallography, Interdisciplinary Nanoscience Center and Department of Chemistry , Aarhus University , Langelandsgade 140 , 8000 Aarhus C , Denmark
| | - Jakob B Grinderslev
- Center for Materials Crystallography, Interdisciplinary Nanoscience Center and Department of Chemistry , Aarhus University , Langelandsgade 140 , 8000 Aarhus C , Denmark
| | - Kasper T Møller
- Center for Materials Crystallography, Interdisciplinary Nanoscience Center and Department of Chemistry , Aarhus University , Langelandsgade 140 , 8000 Aarhus C , Denmark.,Department of Physics and Astronomy, Fuels and Energy Technology Institute , Curtin University , Wark Avenue , Bentley , Western Australia 6102 , Australia
| | - Mark Paskevicius
- Center for Materials Crystallography, Interdisciplinary Nanoscience Center and Department of Chemistry , Aarhus University , Langelandsgade 140 , 8000 Aarhus C , Denmark.,Department of Physics and Astronomy, Fuels and Energy Technology Institute , Curtin University , Wark Avenue , Bentley , Western Australia 6102 , Australia
| | - Torben R Jensen
- Center for Materials Crystallography, Interdisciplinary Nanoscience Center and Department of Chemistry , Aarhus University , Langelandsgade 140 , 8000 Aarhus C , Denmark
| |
Collapse
|
34
|
Cheisson T, Ricard L, Heinemann FW, Meyer K, Auffrant A, Nocton G. Synthesis and Reactivity of Low-Valent f-Element Iodide Complexes with Neutral Iminophosphorane Ligands. Inorg Chem 2018; 57:9230-9240. [DOI: 10.1021/acs.inorgchem.8b01259] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Thibault Cheisson
- LCM, Ecole Polytechnique, CNRS, Université Paris-Saclay, F-91128 Palaiseau Cedex, France
| | - Louis Ricard
- LCM, Ecole Polytechnique, CNRS, Université Paris-Saclay, F-91128 Palaiseau Cedex, France
| | - Frank W. Heinemann
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Karsten Meyer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Audrey Auffrant
- LCM, Ecole Polytechnique, CNRS, Université Paris-Saclay, F-91128 Palaiseau Cedex, France
| | - Grégory Nocton
- LCM, Ecole Polytechnique, CNRS, Université Paris-Saclay, F-91128 Palaiseau Cedex, France
| |
Collapse
|
35
|
Payandeh GharibDoust S, Heere M, Nervi C, Sørby MH, Hauback BC, Jensen TR. Synthesis, structure, and polymorphic transitions of praseodymium(iii) and neodymium(iii) borohydride, Pr(BH 4) 3 and Nd(BH 4) 3. Dalton Trans 2018; 47:8307-8319. [PMID: 29892753 DOI: 10.1039/c8dt00118a] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
In this work, praseodymium(iii) borohydride, Pr(BH4)3, and an isotopically enriched analogue, Pr(11BD4)3, are prepared by a new route via a solvate complex, Pr(11BD4)3S(CH3)2. Nd(BH4)3 was synthesized using the same method and the structures, polymorphic transformations, and thermal stabilities of these compounds are investigated in detail. α-Pr(BH4)3 and α-Nd(BH4)3 are isostructural with cubic unit cells (Pa3[combining macron]) stable at room temperature (RT) and a unit cell volume per formula unit (V/Z) of 180.1 and 175.8 Å3, respectively. Heating α-Pr(BH4)3 to T ∼ 190 °C, p(Ar) = 1 bar, introduces a transition to a rhombohedral polymorph, r-Pr(BH4)3 (R3[combining macron]c) with a smaller unit cell volume and a denser structure, V/Z = 156.06 Å3. A similar transition was not observed for Nd(BH4)3. However, heat treatment of α-Pr(BH4)3, at T ∼ 190 °C, p(H2) = 40 bar and α-Nd(BH4)3, at T ∼ 270 °C, p(H2) = 98 bar facilitates reversible formation of another three cubic polymorph, denoted as β, β' and β''-RE(BH4)3 (Fm3[combining macron]c). Moreover, the transition β- to β'- to β''- is considered a rare example of stepwise negative thermal expansion. For Pr(BH4)3, ∼2/3 of the sample takes this route of transformation whereas in argon only ∼5 wt%, and the remaining transforms directly from α- to r-Pr(BH4)3. The β-polymorphs are porous with V/Z = 172.4 and 172.7 Å3 for β''-RE(BH4)3, RE = Pr or Nd, respectively, and are stabilized by the elevated hydrogen pressures. The polymorphic transitions occur due to rotation of RE(BH4)6 octahedra without breaking or forming chemical bonds. Structural DFT optimization reveals the decreasing stability of α-Pr(BH4)3 > β-Pr(BH4)3 > r-Pr(BH4)3.
Collapse
Affiliation(s)
- SeyedHosein Payandeh GharibDoust
- Center for Materials Crystallography, Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Århus C, Denmark.
| | | | | | | | | | | |
Collapse
|
36
|
Chen XM, Ma N, Zhang QF, Wang J, Feng X, Wei C, Wang LS, Zhang J, Chen X. Elucidation of the Formation Mechanisms of the Octahydrotriborate Anion (B 3H 8-) through the Nucleophilicity of the B-H Bond. J Am Chem Soc 2018; 140:6718-6726. [PMID: 29732884 DOI: 10.1021/jacs.8b03785] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Boron compounds are well-known electrophiles. Much less known are their nucleophilic properties. By recognition of the nucleophilicity of the B-H bond, the formation mechanism of octahydrotriborate (B3H8-) was elucidated on the bases of both experimental and computational investigations. Two possible routes from the reaction of BH4- and THF·BH3 to B3H8- were proposed, both involving the B2H6 and BH4- intermediates. The two pathways consist of a set of complicated intermediates, which can convert to each other reversibly at room temperature and can be represented by a reaction circle. Only under reflux can the B2H6 and BH4- intermediates be converted to B2H5- and BH3(H2) via a high energy barrier, from which H2 elimination occurs to yield the B3H8- final product. The formation of B2H6 from THF·BH3 by nucleophilic substitution of the B-H bond was captured and identified, and the reaction of B2H6 with BH4- to produce B3H8- was confirmed experimentally. On the bases of the formation mechanisms of B3H8-, we have developed a facile synthetic method for MB3H8 (M = Li and Na) in high yields by directly reacting the corresponding MBH4 salts with THF·BH3. In the new synthetic method for MB3H8, no electron carriers are needed, allowing convenient preparation of MB3H8 in large scales and paving the way for their wide applications.
Collapse
Affiliation(s)
- Xi-Meng Chen
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials , Henan Normal University , Xinxiang , Henan 453007 , China
| | - Nana Ma
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials , Henan Normal University , Xinxiang , Henan 453007 , China
| | - Qian-Fan Zhang
- Department of Chemistry , Brown University , Providence , Rhode Island 02912 , United States
| | - Jin Wang
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials , Henan Normal University , Xinxiang , Henan 453007 , China
| | - Xiaoge Feng
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials , Henan Normal University , Xinxiang , Henan 453007 , China
| | - Changgeng Wei
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials , Henan Normal University , Xinxiang , Henan 453007 , China
| | - Lai-Sheng Wang
- Department of Chemistry , Brown University , Providence , Rhode Island 02912 , United States
| | - Jie Zhang
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials , Henan Normal University , Xinxiang , Henan 453007 , China
| | - Xuenian Chen
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials , Henan Normal University , Xinxiang , Henan 453007 , China
| |
Collapse
|
37
|
Payandeh GharibDoust S, Ravnsbæk DB, Černý R, Jensen TR. Synthesis, structure and properties of bimetallic sodium rare-earth (RE) borohydrides, NaRE(BH 4) 4, RE = Ce, Pr, Er or Gd. Dalton Trans 2018; 46:13421-13431. [PMID: 28948259 DOI: 10.1039/c7dt02536j] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Formation, stability and properties of new metal borohydrides within RE(BH4)3-NaBH4, RE = Ce, Pr, Er or Gd is investigated. Three new bimetallic sodium rare-earth borohydrides, NaCe(BH4)4, NaPr(BH4)4 and NaEr(BH4)4 are formed based on an addition reaction between NaBH4 and halide free rare-earth metal borohydrides RE(BH4)3, RE = Ce, Pr, Er. All the new compounds crystallize in the orthorhombic crystal system. NaCe(BH4)4 has unit cell parameters of a = 6.8028(5), b = 17.5181(13), c = 7.2841(5) Å and space group Pbcn. NaPr(BH4)4 is isostructural to NaCe(BH4)4 with unit cell parameters of a = 6.7617(2), b = 17.4678(7), c = 7.2522(3) Å. NaEr(BH4)4 crystallizes in space group Cmcm with unit cell parameters of a = 8.5379(2), b = 12.1570(4), c = 9.1652(3) Å. The structural relationships, also to the known RE(BH4)3, are discussed in detail and related to the stability and synthesis conditions. Heat treatment of NaBH4-Gd(BH4)3 mixture forms an unstable amorphous phase, which decomposes after one day at RT. NaCe(BH4)4 and NaPr(BH4)4 show reversible hydrogen storage capacity of 1.65 and 1.04 wt% in the fourth H2 release, whereas that of NaEr(BH4)4 continuously decreases. This is mainly assigned to formation of metal hydrides and possibly slower formation of sodium borohydride. The dehydrogenated state clearly contains rare-earth metal borides, which stabilize boron in the dehydrogenated state.
Collapse
Affiliation(s)
- SeyedHosein Payandeh GharibDoust
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Langelandsgade 140, 8000 Aarhus C, Denmark.
| | | | | | | |
Collapse
|
38
|
Ameen I, Tripathi AK, Mishra RL, Siddiqui A, Tripathi UN. A study on enhancing the quantum yield and antimicrobial activity of Pr(iii) by varying the coordination environment. RSC Adv 2018; 8:8412-8425. [PMID: 35542021 PMCID: PMC9078554 DOI: 10.1039/c7ra13035j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Accepted: 02/10/2018] [Indexed: 12/31/2022] Open
Abstract
Praseodymium forms complexes easily with nitrogen and oxygen donor pyrazolines and also forms mixed ligand complexes with these pyrazolines and sulfur donor thio ligands such as dithiocarbamates and xanthates. These newly synthesized complexes have been characterized using elemental analysis, FTIR, TGA, SEM, TEM, PXRD and UV-visible spectral measurements. The isotopic studies were performed using DART mass spectrometry. The luminescent properties of these types of complexes were studied using a fluorescence spectrophotometer. The antimicrobial behavior of these praseodymium complexes was studied thoroughly during the present research.
Collapse
Affiliation(s)
- Iffat Ameen
- Department of Chemistry, D. D. U. Gorakhpur University Gorakhpur U. P India +91-9455670369
| | | | - Raj Laxmi Mishra
- Department of Chemistry, D. D. U. Gorakhpur University Gorakhpur U. P India +91-9455670369
| | - Afshan Siddiqui
- Department of Chemistry, D. D. U. Gorakhpur University Gorakhpur U. P India +91-9455670369
| | - Umesh Nath Tripathi
- Department of Chemistry, D. D. U. Gorakhpur University Gorakhpur U. P India +91-9455670369
| |
Collapse
|
39
|
Cloke FGN, Green JC, Kilpatrick AF, O'Hare D. Bonding in pentalene complexes and their recent applications. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2016.12.006] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
40
|
Bhattacharjee J, Harinath A, Nayek HP, Sarkar A, Panda TK. Highly Active and Iso-Selective Catalysts for the Ring-Opening Polymerization of Cyclic Esters using Group 2 Metal Initiators. Chemistry 2017; 23:9319-9331. [DOI: 10.1002/chem.201700672] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Jayeeta Bhattacharjee
- Department of Chemistry; Indian Institute of Technology Hyderabad; Kandi 502 285, Sangareddy, Telangana India
| | - Adimulam Harinath
- Department of Chemistry; Indian Institute of Technology Hyderabad; Kandi 502 285, Sangareddy, Telangana India
| | - Hari Pada Nayek
- Department of Applied Chemistry; Indian Institute of Technology (ISM), Dhanbad; 826004 Jharkhand India
| | - Alok Sarkar
- Momentive Performance Materials Pvt. Ltd. Survey No. 09; Hosur Road Electronic City (West) Bangalore 560100 India
| | - Tarun K. Panda
- Department of Chemistry; Indian Institute of Technology Hyderabad; Kandi 502 285, Sangareddy, Telangana India
| |
Collapse
|
41
|
Goodwin CAP, Chilton NF, Natrajan LS, Boulon ME, Ziller JW, Evans WJ, Mills DP. Investigation into the Effects of a Trigonal-Planar Ligand Field on the Electronic Properties of Lanthanide(II) Tris(silylamide) Complexes (Ln = Sm, Eu, Tm, Yb). Inorg Chem 2017; 56:5959-5970. [DOI: 10.1021/acs.inorgchem.7b00664] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Conrad A. P. Goodwin
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Nicholas F. Chilton
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Louise S. Natrajan
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | | | - Joseph W. Ziller
- Department
of Chemistry, University of California, Irvine, California 92697-2025, United States
| | - William J. Evans
- Department
of Chemistry, University of California, Irvine, California 92697-2025, United States
| | - David P. Mills
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| |
Collapse
|
42
|
|
43
|
Paskevicius M, Jepsen LH, Schouwink P, Černý R, Ravnsbæk DB, Filinchuk Y, Dornheim M, Besenbacher F, Jensen TR. Metal borohydrides and derivatives – synthesis, structure and properties. Chem Soc Rev 2017; 46:1565-1634. [DOI: 10.1039/c6cs00705h] [Citation(s) in RCA: 262] [Impact Index Per Article: 37.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A comprehensive review of metal borohydrides from synthesis to application.
Collapse
Affiliation(s)
- Mark Paskevicius
- Center for Materials Crystallography
- Interdisciplinary Nanoscience Center (iNANO), and Department of Chemistry
- Aarhus University
- DK-8000 Aarhus C
- Denmark
| | - Lars H. Jepsen
- Center for Materials Crystallography
- Interdisciplinary Nanoscience Center (iNANO), and Department of Chemistry
- Aarhus University
- DK-8000 Aarhus C
- Denmark
| | - Pascal Schouwink
- Laboratory of Crystallography
- DQMP
- University of Geneva
- 1211 Geneva
- Switzerland
| | - Radovan Černý
- Laboratory of Crystallography
- DQMP
- University of Geneva
- 1211 Geneva
- Switzerland
| | - Dorthe B. Ravnsbæk
- Department of Physics
- Chemistry and Pharmacy
- University of Southern Denmark
- 5230 Odense M
- Denmark
| | - Yaroslav Filinchuk
- Institute of Condensed Matter and Nanosciences
- Université catholique de Louvain
- B-1348 Louvain-la-Neuve
- Belgium
| | - Martin Dornheim
- Helmholtz-Zentrum Geesthacht
- Department of Nanotechnology
- 21502 Geesthacht
- Germany
| | - Flemming Besenbacher
- Interdisciplinary Nanoscience Center (iNANO) and Department of Physics and Astronomy
- DK-8000 Aarhus C
- Denmark
| | - Torben R. Jensen
- Center for Materials Crystallography
- Interdisciplinary Nanoscience Center (iNANO), and Department of Chemistry
- Aarhus University
- DK-8000 Aarhus C
- Denmark
| |
Collapse
|
44
|
Kim YE, Kim J, Park JW, Park K, Lee Y. σ-Complexation as a strategy for designing copper-based light emitters. Chem Commun (Camb) 2017; 53:2858-2861. [DOI: 10.1039/c6cc10139a] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Introduction of weak σ-SiH coordination to a copper(i) center leads to a highly emissive copper complex to minimize geometry relaxation in MLCT excited states.
Collapse
Affiliation(s)
- Yeong-Eun Kim
- Department of Chemistry
- KAIST
- Daejeon 34141
- Republic of Korea
| | - Jin Kim
- Department of Chemistry
- KAIST
- Daejeon 34141
- Republic of Korea
| | - Joon Woo Park
- Department of Chemistry
- KAIST
- Daejeon 34141
- Republic of Korea
| | - Kiyoung Park
- Department of Chemistry
- KAIST
- Daejeon 34141
- Republic of Korea
| | - Yunho Lee
- Department of Chemistry
- KAIST
- Daejeon 34141
- Republic of Korea
| |
Collapse
|
45
|
Kilpatrick AFR, Cloke FGN. A base-free synthetic route to anti-bimetallic lanthanide pentalene complexes. Dalton Trans 2017; 46:5587-5597. [DOI: 10.1039/c6dt04475a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Homobimetallic complexes of Yb, Eu and Sm bridged by a silylated pentalene ligand have been prepared and intermetallic communication studied by magnetic measurements and cyclic voltammetry.
Collapse
|
46
|
Heere M, Payandeh GharibDoust SH, Frommen C, Humphries TD, Ley MB, Sørby MH, Jensen TR, Hauback BC. The influence of LiH on the rehydrogenation behavior of halide free rare earth (RE) borohydrides (RE = Pr, Er). Phys Chem Chem Phys 2016; 18:24387-95. [PMID: 27533740 DOI: 10.1039/c6cp04523e] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Rare earth (RE) metal borohydrides are receiving immense consideration as possible hydrogen storage materials and solid-state Li-ion conductors. In this study, halide free Er(BH4)3 and Pr(BH4)3 have been successfully synthesized for the first time by the combination of mechanochemical milling and/or wet chemistry. Rietveld refinement of Er(BH4)3 confirmed the formation of two different Er(BH4)3 polymorphs: α-Er(BH4)3 with space group Pa3[combining macron], a = 10.76796(5) Å, and β-Er(BH4)3 in Pm3[combining macron]m with a = 5.4664(1) Å. A variety of Pr(BH4)3 phases were found after extraction with diethyl ether: α-Pr(BH4)3 in Pa3[combining macron] with a = 11.2465(1) Å, β-Pr(BH4)3 in Pm3[combining macron]m with a = 5.716(2) Å and LiPr(BH4)3Cl in I4[combining macron]3m, a = 11.5468(3) Å. Almost phase pure α-Pr(BH4)3 in Pa3[combining macron] with a = 11.2473(2) Å was also synthesized. The thermal decomposition of Er(BH4)3 and Pr(BH4)3 proceeded without the formation of crystalline products. Rehydrogenation, as such, was not successful. However, addition of LiH promoted the rehydrogenation of RE hydride phases and LiBH4 from the decomposed RE(BH4)3 samples.
Collapse
Affiliation(s)
- Michael Heere
- Physics Department, Institute for Energy Technology, NO-2027 Kjeller, Norway.
| | | | | | | | | | | | | | | |
Collapse
|
47
|
Ley MB, Jørgensen M, Černý R, Filinchuk Y, Jensen TR. From M(BH 4) 3 (M = La, Ce) Borohydride Frameworks to Controllable Synthesis of Porous Hydrides and Ion Conductors. Inorg Chem 2016; 55:9748-9756. [PMID: 27622390 DOI: 10.1021/acs.inorgchem.6b01526] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Rare earth metal borohydrides show a number of interesting properties, e.g., Li ion conductivity and luminescence, and the series of materials is well explored. However, previous attempts to obtain M(BH4)3 (M = La, Ce) by reacting MCl3 and LiBH4 yielded LiM(BH4)3Cl. Here, a synthetic approach is presented, which allows the isolation of M(BH4)3 (M = La, Ce) via formation of intermediate complexes with dimethyl sulfide. The cubic c-Ce(BH4)3 (Fm3̅c) is isostructural to high-temperature polymorphs of A(BH4)3 (A = Y, Sm, Er, Yb) borohydrides. The larger size of the Ce3+ ion makes the empty void in the open ReO3-type framework structure potentially accessible to small guest molecules like H2. Another new rhombohedral polymorph, r-M(BH4)3 (M = La, Ce), is a closed form of the framework, prone to stacking faults. The new compounds M(BH4)3 (M = La, Ce) can be combined with LiCl in an addition reaction to form LiM(BH4)3Cl also known as Li4[M4(BH4)12Cl4]; the latter contains the unique tetranuclear cluster [M4(BH4)12Cl4]4- and shows high Li-ion conductivity. This reaction pathway opens a way to synthesize a series of A4[M4(BH4)12X4] (M = La, Ce) compounds with different anions (X) and metal ions (A) and potentially high ion conductivity.
Collapse
Affiliation(s)
- Morten Brix Ley
- Center for Materials Crystallography (CMC), Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, University of Aarhus , Langelandsgade 140, DK-8000 Århus C, Denmark.,Max-Planck-Institut für Kohlenforschung , Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Mathias Jørgensen
- Center for Materials Crystallography (CMC), Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, University of Aarhus , Langelandsgade 140, DK-8000 Århus C, Denmark
| | - Radovan Černý
- Laboratory of Crystallography, DQMP, University of Geneva , Quai Ernest-Ansermet 24, CH-1211 Geneva, Switzerland
| | - Yaroslav Filinchuk
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain , Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium
| | - Torben R Jensen
- Center for Materials Crystallography (CMC), Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, University of Aarhus , Langelandsgade 140, DK-8000 Århus C, Denmark
| |
Collapse
|
48
|
Abstract
Two new Eu(II)-containing cryptates were prepared with a new nitrogenous cryptand functionalized with three benzo groups. The introduction of three aromatic rings into the ligand backbone imparts lopsided geometrical features on the resulting Eu(II) coordination environments. In both complexes, the interactions between Eu and the amines on the aromatic side of the molecule are weaker than those on the nonaromatic side, resulting in one discrete unit with two distinct faces. One of the new complexes is, to the best of our knowledge, the first direct observation of a bis-aquo Eu(II)-containing cryptate with two nonadjacent inner-sphere water molecules. In addition to solid-phase structure, the electronic UV-visible and emission spectra of the new complexes were studied in acetonitrile. Experimental results show that the decreased Lewis basicity of the aromatic face hypsochromically shifts absorbances and emissions from a structurally related compound without the benzo groups.
Collapse
Affiliation(s)
- Guo-Xia Jin
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University , Jinan 250014, P. R. China.,Department of Chemistry, Wayne State University , Detroit, Michigan 48202, United States
| | - Matthew D Bailey
- Department of Chemistry, Wayne State University , Detroit, Michigan 48202, United States
| | - Matthew J Allen
- Department of Chemistry, Wayne State University , Detroit, Michigan 48202, United States
| |
Collapse
|
49
|
Yin H, Carroll PJ, Manor BC, Anna JM, Schelter EJ. Cerium Photosensitizers: Structure-Function Relationships and Applications in Photocatalytic Aryl Coupling Reactions. J Am Chem Soc 2016; 138:5984-93. [PMID: 27058605 DOI: 10.1021/jacs.6b02248] [Citation(s) in RCA: 110] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Two complete mixed-ligand series of luminescent Ce(III) complexes with the general formulas [(Me3Si)2NC(N(i)Pr)2]xCe(III)[N(SiMe3)2]3-x (x = 0, 1-N; x = 1, 2-N, x = 2, 3-N; x = 3, 4) and [(Me3Si)2NC(N(i)Pr)2]xCe(III)(OAr)3-x (x = 0, 1-OAr; x = 1, 2-OAr, x = 2, 3-OAr; x = 3, 4) were developed, featuring photoluminescence quantum yields up to 0.81(2) and lifetimes to 117(1) ns. Although the 4f → 5d absorptive transitions for these complexes were all found at ca. 420 nm, their emission bands exhibited large Stokes shifts with maxima occurring at 553 nm for 1-N, 518 nm for 2-N, 508 nm for 3-N, and 459 nm for 4, featuring yellow, lime-green, green, and blue light, respectively. Combined time-dependent density functional theory (TD-DFT) calculations and spectroscopic studies suggested that the long-lived (2)D excited states of these complexes corresponded to singly occupied 5dz(2) orbitals. The observed difference in the Stokes shifts was attributed to the relaxation of excited states through vibrational processes facilitated by the ligands. The photochemistry of the sterically congested complex 4 was demonstrated by C-C bond forming reaction between 4-fluoroiodobenzene and benzene through an outer sphere electron transfer pathway, which expands the capabilities of cerium photosensitizers beyond our previous results that demonstrated inner sphere halogen atom abstraction reactivity by 1-N.
Collapse
Affiliation(s)
- Haolin Yin
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - Patrick J Carroll
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - Brian C Manor
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - Jessica M Anna
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - Eric J Schelter
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| |
Collapse
|
50
|
Møller KT, Ley MB, Schouwink P, Černý R, Jensen TR. Synthesis and thermal stability of perovskite alkali metal strontium borohydrides. Dalton Trans 2016; 45:831-40. [DOI: 10.1039/c5dt03590b] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis of new thermally stable perovskite-type metal strontium borohydrides, MSr(BH4)3 (M = K, Rb, Cs).
Collapse
Affiliation(s)
- Kasper T. Møller
- Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry
- University of Aarhus
- DK-8000 Aarhus
- Denmark
| | - Morten B. Ley
- Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry
- University of Aarhus
- DK-8000 Aarhus
- Denmark
- Max-Planck-Institut für Kohlenforschung
| | - Pascal Schouwink
- Laboratory of Crystallography
- DQMP
- University of Geneva
- CH-1211 Geneva
- Switzerland
| | - Radovan Černý
- Laboratory of Crystallography
- DQMP
- University of Geneva
- CH-1211 Geneva
- Switzerland
| | - Torben R. Jensen
- Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry
- University of Aarhus
- DK-8000 Aarhus
- Denmark
| |
Collapse
|