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22 results on '"Van Meervelt, Luc"'

4. Liquid Nickel Salts: Synthesis, Crystal Structure Determination, and Electrochemical Synthesis of Nickel Nanoparticles

Author

Sniekers, Jeroen, primary, Verguts, Ken, additional, Brooks, Neil R., additional, Schaltin, Stijn, additional, Phan, Thanh Hai, additional, Trung Huynh, Thi Mien, additional, Van Meervelt, Luc, additional, De Feyter, Steven, additional, Seo, Jin Won, additional, Fransaer, Jan, additional, and Binnemans, Koen, additional

Published
2015
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10. Homodiselenacalix[4]arenes: Molecules with Unique Channelled Crystal Structures.

Author

Thomas, Joice, Dobrzańska, Liliana, Van Meervelt, Luc, Quevedo, Mario Alfredo, Woźniak, Krzysztof, Stachowicz, Marcin, Smet, Mario, Maes, Wouter, and Dehaen, Wim

Subjects
AROMATIC compounds, ORGANIC cyclic compounds, NUCLEOPHILIC aromatic photosubstitution, CRYSTAL structure, CRYSTALLOGRAPHY
Abstract

A synthetic route towards homodiselenacalix[4]arene macrocycles is presented, based on the dynamic covalent chemistry of diselenides. The calixarene inner rim is decorated with either alkoxy or tert-butyl ester groups. Single-crystal X-ray analysis of two THF solvates with methoxy and ethoxy substituents reveals the high similarity of their molecular structures and alterations on the supramolecular level. In both crystal structures, solvent channels are present and differ in both shape and capacity. Furthermore, the methoxy-substituted macrocycle undergoes a single-crystal-to-single-crystal transformation during which the molecular structure changes its conformation from 1,3-alternate (loaded with THF/water) to 1,2-alternate (apohost form). Molecular modelling techniques were applied to explore the conformational and energetic behaviour of the macrocycles. [ABSTRACT FROM AUTHOR]

Published
2016
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11. Liquid Nickel Salts: Synthesis, Crystal Structure Determination, and Electrochemical Synthesis of Nickel Nanoparticles.

Author

Sniekers, Jeroen, Verguts, Ken, Brooks, Neil R., Schaltin, Stijn, Phan, Thanh Hai, Trung Huynh, Thi Mien, Van Meervelt, Luc, De Feyter, Steven, Seo, Jin Won, Fransaer, Jan, and Binnemans, Koen

Subjects
SALTS, CHEMISTRY, NICKEL, TRANSITION metals, NANOPARTICLES
Abstract

New nickel-containing ionic liquids were synthesized, characterized and their electrochemistry was investigated. In addition, a mechanism for the electrochemical synthesis of nanoparticles from these compounds is proposed. In these so-called liquid metal salts, the nickel(II) cation is octahedrally coordinated by six N-alkylimidazole ligands. The different counter anions that were used are bis(trifluoromethanesulfonyl)imide (Tf2N−), trifluoromethanesulfonate (OTf−) and methanesulfonate (OMs−). Several different N-alkylimidazoles were considered, with the alkyl sidechain ranging in length from methyl to dodecyl. The newly synthesized liquid metal salts were characterized by CHN analysis, FTIR, DSC, TGA and viscosity measurements. An odd-even effect was observed for the melting temperatures and viscosities of the ionic liquids, with the complexes with an even number of carbon atoms in the alkyl chain of the imidazole having a higher melting temperature and a lower viscosity than the complexes with an odd number of carbons. The crystal structures of several of the nickel(II) complexes that are not liquid at room temperature were determined. The electrochemistry of the compounds with the lowest viscosities was investigated. The nickel(II) cation could be reduced but surprisingly no nickel deposits were obtained on the electrode. Instead, nickel nanoparticles were formed at 100 % selectivity, as confirmed by TEM. The magnetic properties of these nanoparticles were investigated by SQUID measurements. [ABSTRACT FROM AUTHOR]

Published
2016
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17. Cobalt(II) Complexes of Nitrile‐Functionalized Ionic Liquids

Author

Nockemann, Peter, primary, Pellens, Michael, additional, Van Hecke, Kristof, additional, Van Meervelt, Luc, additional, Wouters, Johan, additional, Thijs, Ben, additional, Vanecht, Evert, additional, Parac‐Vogt, Tatjana N., additional, Mehdi, Hasan, additional, Schaltin, Stijn, additional, Fransaer, Jan, additional, Zahn, Stefan, additional, Kirchner, Barbara, additional, and Binnemans, Koen, additional

Published
2010
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18. Speciation of Rare‐Earth Metal Complexes in Ionic Liquids: A Multiple‐Technique Approach

Author

Nockemann, Peter, primary, Thijs, Ben, additional, Lunstroot, Kyra, additional, Parac‐Vogt, Tatjana N., additional, Görller‐Walrand, Christiane, additional, Binnemans, Koen, additional, Van Hecke, Kristof, additional, Van Meervelt, Luc, additional, Nikitenko, Sergey, additional, Daniels, John, additional, Hennig, Christoph, additional, and Van Deun, Rik, additional

Published
2009
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19. Pyrrolidinium Ionic Liquid Crystals

Author

Goossens, Karel, primary, Lava, Kathleen, additional, Nockemann, Peter, additional, Van Hecke, Kristof, additional, Van Meervelt, Luc, additional, Driesen, Kris, additional, Görller‐Walrand, Christiane, additional, Binnemans, Koen, additional, and Cardinaels, Thomas, additional

Published
2008
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20. Structural Characterization of the Complex between Hen Egg-White Lysozyme and ZrIV-Substituted Keggin Polyoxometalate as Artificial Protease.

Author

Sap, Annelies, De Zitter, Elke, Van Meervelt, Luc, and Parac ‐ Vogt, Tatjana N.

Subjects
EGG whites, LYSOZYMES, POLYOXOMETALATES, PROTEOLYTIC enzymes, HYDROLYSIS, HYDROGEN bonding
Abstract

Successful co-crystallization of a noncovalent complex between hen egg-white lysozyme (HEWL) and the monomeric ZrIV-substituted Keggin polyoxometalate (POM) (Zr1 K1), (Et2NH2)3[Zr(PW11O39)] ( 1), has been achieved, and its single-crystal X-ray structure has been determined. The dimeric ZrIV-substituted Keggin-type polyoxometalate (Zr1 K2), (Et2NH2)10[Zr(PW11O39)2] ( 2), has been previously shown to exhibit remarkable selectivity towards HEWL hydrolysis. The reported X-ray structure shows that the hydrolytically active ZrIV-substituted Keggin POM exists as a monomeric species. Prior to hydrolysis, this monomer interacts with HEWL in the vicinity of the previously identified cleavage sites found at Trp28-Val29 and Asn44-Arg45, through water-mediated H-bonding and electrostatic interactions. Three binding sites are observed at the interface of the negatively charged Keggin POM and the positively charged regions of HEWL at: 1) Gly16, Tyr20, and Arg21; 2) Asn44, Arg45, and Asn46; and 3) Arg128. [ABSTRACT FROM AUTHOR]

Published
2015
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22. Pyrrolidinium Ionic Liquid Crystals.

Author

Goossens, Karel, Lava, Kathleen, Nockemann, Peter, Van Hecke, Kristof, Van Meervelt, Luc, Driesen, Kris, Görller-Walrand, Christiane, Binnemans, Koen, and Cardinaels, Thomas

Published
2009
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