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Long C, Ray M. Water-soluble chiral coordination polymers of Li +, Na +, K +, and Ba 2+ with an anionic iron(III) complex of a L-threonine derivative and a significant red shift of visible spectra with Al 3+ salt. Dalton Trans 2024; 53:6642-6652. [PMID: 38525650 DOI: 10.1039/d3dt03945e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/26/2024]
Abstract
Four salts of an anionic iron(III) bis-complex, [Fe(LL-thr)2]1-, were synthesized from water or methanol. H2LL-thr is a tridentate ligand derived from the L-threonine amino acid, and the cations used are Li+ (1), Na+ (2), K+ (3), and Ba2+ (4). Single-crystal X-ray diffraction showed that all the complexes are coordination polymers of different dimensionalities. The iron(III) complex binds to cations through its coordinated phenolate and non-coordinated carboxylate oxygen atoms. While Li+ forms a linear chain, all others have a pair of bridged cations intervening the iron(III) complexes. The 3D network of Ba2+ salt has a sizeable solvent-accessible space occupied by aquated chloride ions. The differences in circular dichroism (CD) spectra and significantly lower conductance values in water and methanol support partial retention of the polymeric nature in methanol. The visible spectra of 4 in methanol or water showed an ∼10 nm shift of the charge transfer bands from 3. However, the addition of Al3+ salt to 2 showed a significant colour shift. Further investigation confirmed that the colour shift is due to partial protonation of the complex with protons generated from salt hydrolysis. Most reports on visual aluminium detection consider aluminium's binding as the shift's source. The present results show that protonation due to hydrolysis of aluminium salt can skew the observation.
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Affiliation(s)
- Chanreingam Long
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, India.
| | - Manabendra Ray
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, India.
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2
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Hewage N, Mastriano C, Brückner C, Zeller M. Bis(catecholato-κ 2
O, O′)bis(dimethyl sulfoxide-κ O)titanium(IV). Acta Crystallogr E Crystallogr Commun 2022; 78:385-391. [PMID: 35492266 PMCID: PMC8983984 DOI: 10.1107/s2056989022002638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Accepted: 03/08/2022] [Indexed: 11/22/2022]
Abstract
Bis(catecholato)bis(DMSO)titanium crystallizes with two crystallographically independent molecules related by pseudo-glide symmetry in a distorted octahedral O6 donor-atom geometry around titanium. Bis(benzene-1,2-diolato-κ2O,O′)bis(dimethyl sulfoxide-κO)titanium(IV), [Ti(C6H4O2)2(C2H6OS)2], crystallizes with two crystallographically independent molecules in the space group P21/c emulating orthorhombic Pbca symmetry (β = 90.0445 (9)°]. The two molecules are related by pseudo-glide symmetry, broken by modulation of each one catecholate and dimethyl sulfoxide (DMSO) ligand. Twinning by pseudomerohedry was observed [twin ratio 0.5499 (7):0.4401 (7)]. Complex 3 was obtained by heating of diprotonated titanium tris-catecholate precursor 2H in DMSO, by formal displacement of a catechol molecule by two DMSO molecules. Complex 3 is just the second heteroleptic, mono-nuclear, neutral bis-catecholate complex with TiO6 metal coordination, the only other one being its bis-DMF analogue 6. The two molecules of 3 exhibit a distorted octahedral geometry. The geometry and distortions from ideal symmetry of 3 are discussed and compared to 6 and to cationic tris-catecholate titanium complexes.
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3
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Kwamen ACN, de Macedo GS, Wiederhold C, Oppel IM, Albrecht M. Catechol Thioesters: Ligands for Hierarchically Formed Lithium-Bridged Titanium(IV) Helicates and Helicate-Based Switches. Chemistry 2020; 26:3829-3833. [PMID: 31899932 PMCID: PMC7154688 DOI: 10.1002/chem.201905212] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Indexed: 12/22/2022]
Abstract
The thioester moiety is introduced as a lithium binding unit for the hierarchical formation of titanium(IV) catecholate-based lithium-bridged helicates. In solution, the coordination compounds show a monomer-dimer equilibrium which -in comparison to the oxo esters- is significantly shifted towards the monomers. In addition, the influence of the thioester side chain on the dimerization behavior is investigated and an expansible/compressible molecular switch is synthesized. In the latter case expansion and compression are performed reversibly in methanol, whereas in DMSO spontaneous expansion occurs.
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Affiliation(s)
- A. Carel N. Kwamen
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Gilles S. de Macedo
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Constanze Wiederhold
- Institut für Anorganische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Iris M. Oppel
- Institut für Anorganische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Markus Albrecht
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
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4
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Kwamen ACN, Schlottmann M, Van Craen D, Isaak E, Baums J, Shen L, Massomi A, Räuber C, Joseph BP, Raabe G, Göb C, Oppel IM, Puttreddy R, Ward JS, Rissanen K, Fröhlich R, Albrecht M. Shedding Light on the Interactions of Hydrocarbon Ester Substituents upon Formation of Dimeric Titanium(IV) Triscatecholates in DMSO Solution. Chemistry 2020; 26:1396-1405. [PMID: 31737953 PMCID: PMC7027801 DOI: 10.1002/chem.201904639] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Indexed: 01/27/2023]
Abstract
The dissociation of hierarchically formed dimeric triple lithium bridged triscatecholate titanium(IV) helicates with hydrocarbyl esters as side groups is systematically investigated in DMSO. Primary alkyl, alkenyl, alkynyl as well as benzyl esters are studied in order to minimize steric effects close to the helicate core. The 1 H NMR dimerization constants for the monomer-dimer equilibrium show some solvent dependent influence of the side chains on the dimer stability. In the dimer, the ability of the hydrocarbyl ester groups to aggregate minimizes their contacts with the solvent molecules. Due to this, most solvophobic alkyl groups show the highest dimerization tendency followed by alkenyls, alkynyls and finally benzyls. Furthermore, trends within the different groups of compounds can be observed. For example, the dimer is destabilized by internal double or triple bonds due to π-π repulsion. A strong indication for solvent supported London dispersion interaction between the ester side groups is found by observation of an even/odd alternation of dimerization constants within the series of n-alkyls, n-Ω-alkenyls or n-Ω-alkynyls. This corresponds to the interaction of the parent hydrocarbons, as documented by an even/odd melting point alternation.
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Affiliation(s)
- A. Carel N. Kwamen
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Marcel Schlottmann
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - David Van Craen
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Elisabeth Isaak
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Julia Baums
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Li Shen
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Ali Massomi
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Christoph Räuber
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Benjamin P. Joseph
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Gerhard Raabe
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Christian Göb
- Institut für Anorganische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Iris M. Oppel
- Institut für Anorganische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Rakesh Puttreddy
- University of JyväskyläDepartment of ChemistryP.O. Box 35Jyväskylä40014Finland
| | - Jas S. Ward
- University of JyväskyläDepartment of ChemistryP.O. Box 35Jyväskylä40014Finland
| | - Kari Rissanen
- University of JyväskyläDepartment of ChemistryP.O. Box 35Jyväskylä40014Finland
| | - Roland Fröhlich
- Organisch-Chemisches InstitutUniversität MünsterCorrensstrasse 4048149MünsterGermany
| | - Markus Albrecht
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
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5
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Svensson FG, Daniel G, Tai CW, Seisenbaeva GA, Kessler VG. Titanium phosphonate oxo-alkoxide “clusters”: solution stability and facile hydrolytic transformation into nano titania. RSC Adv 2020; 10:6873-6883. [PMID: 35493899 PMCID: PMC9049727 DOI: 10.1039/c9ra10691j] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Accepted: 02/09/2020] [Indexed: 01/14/2023] Open
Abstract
Oligonuclear Ti(iv) oxo-alkoxide-phosphonate complexes, produced by reaction of tBuPO(OH)2 with Ti(OR)4, are easily topotactically hydrolyzed forming intricate nanostructures.
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Affiliation(s)
- Fredric G. Svensson
- Department of Molecular Sciences
- Swedish University of Agricultural Sciences
- 750 07 Uppsala
- Sweden
| | - Geoffrey Daniel
- Department of Biomaterials and Technology/Wood Science
- Swedish University of Agricultural Sciences
- 75007 Uppsala
- Sweden
| | - Cheuk-Wai Tai
- Department of Materials and Environmental Chemistry
- Stockholm University
- 106 91 Stockholm
- Sweden
| | - Gulaim A. Seisenbaeva
- Department of Molecular Sciences
- Swedish University of Agricultural Sciences
- 750 07 Uppsala
- Sweden
| | - Vadim G. Kessler
- Department of Molecular Sciences
- Swedish University of Agricultural Sciences
- 750 07 Uppsala
- Sweden
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6
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Fandos R, Hernández C, Otero A, Pacheco J, Rodríguez AM, Ruiz MJ, Organero JÁ. Experimental and Theoretical Studies on the Reactivity of Titanium Chelidamate Complexes: the Significant Role of the Hydroxide Pyridine Moiety. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00209] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rosa Fandos
- Universidad de Castilla-La Mancha, Instituto de Nanociencia, Nanotecnología y Materiales Moleculares (INAMOL), Facultad de Ciencias del Medio Ambiente, Avda. Carlos III, s/n, 45071 Toledo, Spain
| | - Carolina Hernández
- Universidad de Castilla-La Mancha, Instituto de Nanociencia, Nanotecnología y Materiales Moleculares (INAMOL), Facultad de Ciencias del Medio Ambiente, Avda. Carlos III, s/n, 45071 Toledo, Spain
| | - Antonio Otero
- Universidad de Castilla-La Mancha, Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas Químicas, Avda. Camilo José Cela, 10, 13071 Ciudad Real, Spain
| | - Janira Pacheco
- Universidad de Castilla-La Mancha, Instituto de Nanociencia, Nanotecnología y Materiales Moleculares (INAMOL), Facultad de Ciencias del Medio Ambiente, Avda. Carlos III, s/n, 45071 Toledo, Spain
| | - Ana M. Rodríguez
- Universidad de Castilla-La Mancha, ETS Ingenieros Industriales, Campus de Ciudad
Real, Avda. Camilo José Cela, 3, 13071 Ciudad Real, Spain
| | - María José Ruiz
- Universidad de Castilla-La Mancha, Instituto de Nanociencia, Nanotecnología y Materiales Moleculares (INAMOL), Facultad de Ciencias del Medio Ambiente, Avda. Carlos III, s/n, 45071 Toledo, Spain
| | - Juan Ángel Organero
- Universidad de Castilla-La Mancha, Instituto de Nanociencia, Nanotecnología y Materiales Moleculares (INAMOL), Facultad de Ciencias del Medio Ambiente, Avda. Carlos III, s/n, 45071 Toledo, Spain
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7
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Park I, Tabelin CB, Magaribuchi K, Seno K, Ito M, Hiroyoshi N. Suppression of the release of arsenic from arsenopyrite by carrier-microencapsulation using Ti-catechol complex. JOURNAL OF HAZARDOUS MATERIALS 2018; 344:322-332. [PMID: 29080485 DOI: 10.1016/j.jhazmat.2017.10.025] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2017] [Revised: 09/24/2017] [Accepted: 10/12/2017] [Indexed: 06/07/2023]
Abstract
Arsenopyrite is the most common arsenic-bearing sulfide mineral in nature, and its weathering contributes to acid mine drainage (AMD) formation and the release of toxic arsenic (As). To mitigate this problem, carrier-microencapsulation (CME) using titanium (Ti)-catechol complex (i.e., Ti-based CME) was investigated to passivate arsenopyrite by forming a protective coating. Ti4+ ion dissolved in sulfuric acid and catechol were used to successfully synthesize Ti(IV) tris-catecholate complex, [Ti(Cat)3]2-, which was stable in the pH range of 5-12. Electrochemical studies on the redox properties of this complex indicate that its oxidative decomposition was a one-step, irreversible process. The leaching of As from arsenopyrite was suppressed by CME treatment using the synthesized Ti-catechol complex. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) indicate that this suppression was primarily due to the formation of an anatase (β-TiO2)-containing coating. Based on these results, a detailed 4-step mechanism to explain the decomposition of [Ti(Cat)3]2- and formation of TiO2 coating in Ti-based CME is proposed: (1) adsorption, (2) partial oxidation-intermediate formation, (3) non electrochemical dissociation, and (4) hydrolysis-precipitation.
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Affiliation(s)
- Ilhwan Park
- Laboratory of Mineral Processing and Resources Recycling, Division of Sustainable Resources Engineering, Graduate School of Engineering, Hokkaido University, Japan.
| | - Carlito Baltazar Tabelin
- Laboratory of Mineral Processing and Resources Recycling, Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University, Japan
| | - Kagehiro Magaribuchi
- Laboratory of Mineral Processing and Resources Recycling, Division of Sustainable Resources Engineering, Graduate School of Engineering, Hokkaido University, Japan
| | - Kensuke Seno
- Laboratory of Mineral Processing and Resources Recycling, Division of Sustainable Resources Engineering, Graduate School of Engineering, Hokkaido University, Japan
| | - Mayumi Ito
- Laboratory of Mineral Processing and Resources Recycling, Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University, Japan
| | - Naoki Hiroyoshi
- Laboratory of Mineral Processing and Resources Recycling, Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University, Japan
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8
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Jin S, Li C, Shrestha LK, Yamauchi Y, Ariga K, Hill JP. Simple Fabrication of Titanium Dioxide/N-Doped Carbon Hybrid Material as Non-Precious Metal Electrocatalyst for the Oxygen Reduction Reaction. ACS APPLIED MATERIALS & INTERFACES 2017; 9:18782-18789. [PMID: 28481078 DOI: 10.1021/acsami.7b03305] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report a new approach for the fabrication of hybrid titanium dioxide/carbon materials derived from a porous titanium coordination polymer composed of a catechol-substituted porphyrin and Ti4+. Titanium dioxide nanocrystals were formed distributed in a nitrogen-doped carboniferous matrix after the thermolysis of the coordination polymer. The identity of the titanium dioxide phase, i.e., anatase or rutile, could be controlled by varying the thermolysis temperature. Electrochemical performances of the composites were explored with results demonstrating that the hybrid materials are promising cathodic materials for the oxygen reduction reaction.
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Affiliation(s)
- Shangbin Jin
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology , 1037 Luoyu Road, Wuhan,430074, China
| | | | | | - Yusuke Yamauchi
- Australian Institute for Innovative Materials (AIIM), University of Wollongong , Squires Way, North Wollongong, New South Wales 2500, Australia
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