showing 15 related works from this author
Shedding Light on the Interactions of Hydrocarbon Ester Substituents upon Formation of Dimeric Titanium(IV) Triscatecholates in DMSO Solution
2020
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 1H 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…
A Supramolecular Chiral Auxiliary Approach: “Remote Control ”of Stereochemistry at a Hierarchically Assembled Dimeric Helicate
2016
Dimeric hierarchically-assembled titanium(IV) helicates are in solvent-dependent equilibrium with the corresponding monomers. Statistically formed mixtures of such complexes bearing chiral stereocontrolling ligands and achiral diene-substituted ligands show high diastereoselectivity and reasonable enantioselectivity in the Diels-Alder reaction with maleimides if the reaction proceeds with the dimer but not with the monomer. Thus, solvent dependent switching between the monomer and dimer enables on/off switching of the enantioselectivity.
Chasing Weak Forces: Hierarchically Assembled Helicates as a Probe for the Evaluation of the Energetics of Weak Interactions.
2017
London dispersion forces are the weakest interactions between molecules. Because of this, their influence on chemical processes is often low, but can definitely not be ignored, and even becomes important in cases of molecules with large contact surfaces. Hierarchically assembled dinuclear titanium(IV) helicates represent a rare example in which the direct observation of London dispersion forces is possible in solution even in the presence of strong cohesive solvent effects. Hereby, the dispersion forces do not unlimitedly support the formation of the dimeric complexes. Although they have some favorable enthalpic contribution to the dimerization of the monomeric complex units, large flexible…
Expanding the Size of Catecholesters - Modified Ligands for the Hierarchical Assembly of Dinuclear Titanium(IV) Helicates
2015
Five 2,3-dihydroxybenzoic acid derivatives 1 – 5 were used as starting materials to obtain the corresponding methyl and ethyl esters. Those were applied as ligands in the hierarchical self-assembly of lithium-bridged dinuclear titanium(IV) complexes 1a–4a, 1b–3b, and 5b. The equilibria between the mononuclear triscatecholate complexes (monomer) and the dinuclear helicates (dimer) were observed by 1H NMR spectroscopy in [D6]DMSO and [D4]MeOH at room temperature.
CCDC 1950786: Experimental Crystal Structure Determination
2020
Related Article: A. Carel N. Kwamen, Marcel Schlottmann, David Van Craen, Elisabeth Isaak, Julia Baums, Li Shen, Ali Massomi, Christoph Räuber, Benjamin P. Joseph, Gerhard Raabe, Christian Göb, Iris M. Oppel, Rakesh Puttreddy, Jas S. Ward, Kari Rissanen, Roland Fröhlich, Markus Albrecht|2020|Chem.-Eur.J.|26|1396|doi:10.1002/chem.201904639
CCDC 1919187: Experimental Crystal Structure Determination
2020
Related Article: A. Carel N. Kwamen, Marcel Schlottmann, David Van Craen, Elisabeth Isaak, Julia Baums, Li Shen, Ali Massomi, Christoph Räuber, Benjamin P. Joseph, Gerhard Raabe, Christian Göb, Iris M. Oppel, Rakesh Puttreddy, Jas S. Ward, Kari Rissanen, Roland Fröhlich, Markus Albrecht|2020|Chem.-Eur.J.|26|1396|doi:10.1002/chem.201904639
CCDC 1539540: Experimental Crystal Structure Determination
2020
Related Article: David Van Craen, Wolfgang H. Rath, Marina Huth, Laura Kemp, Christoph Räuber, Jan M. Wollschläger, Christoph A. Schalley, Arto Valkonen, Kari Rissanen, Markus Albrecht|2017|J.Am.Chem.Soc.|139|16959|doi:10.1021/jacs.7b10098
CCDC 1917460: Experimental Crystal Structure Determination
2020
Related Article: A. Carel N. Kwamen, Marcel Schlottmann, David Van Craen, Elisabeth Isaak, Julia Baums, Li Shen, Ali Massomi, Christoph Räuber, Benjamin P. Joseph, Gerhard Raabe, Christian Göb, Iris M. Oppel, Rakesh Puttreddy, Jas S. Ward, Kari Rissanen, Roland Fröhlich, Markus Albrecht|2020|Chem.-Eur.J.|26|1396|doi:10.1002/chem.201904639
CCDC 1407855: Experimental Crystal Structure Determination
2015
Related Article: David Van Craen, Marita de Groot, Markus Albrecht, Fanfang Pan and Kari Rissanen|2015|Z.Anorg.Allg.Chem.|641|2222|doi:10.1002/zaac.201500543
CCDC 1539541: Experimental Crystal Structure Determination
2020
Related Article: David Van Craen, Wolfgang H. Rath, Marina Huth, Laura Kemp, Christoph Räuber, Jan M. Wollschläger, Christoph A. Schalley, Arto Valkonen, Kari Rissanen, Markus Albrecht|2017|J.Am.Chem.Soc.|139|16959|doi:10.1021/jacs.7b10098
CCDC 1438663: Experimental Crystal Structure Determination
2016
Related Article: David Van Craen, Markus Albrecht, Gerhard Raabe, Fangfang Pan, Kari Rissanen|2016|Chem.-Eur.J.|22|3255|doi:10.1002/chem.201600158
CCDC 1919188: Experimental Crystal Structure Determination
2020
Related Article: A. Carel N. Kwamen, Marcel Schlottmann, David Van Craen, Elisabeth Isaak, Julia Baums, Li Shen, Ali Massomi, Christoph Räuber, Benjamin P. Joseph, Gerhard Raabe, Christian Göb, Iris M. Oppel, Rakesh Puttreddy, Jas S. Ward, Kari Rissanen, Roland Fröhlich, Markus Albrecht|2020|Chem.-Eur.J.|26|1396|doi:10.1002/chem.201904639
CCDC 1919186: Experimental Crystal Structure Determination
2020
Related Article: A. Carel N. Kwamen, Marcel Schlottmann, David Van Craen, Elisabeth Isaak, Julia Baums, Li Shen, Ali Massomi, Christoph Räuber, Benjamin P. Joseph, Gerhard Raabe, Christian Göb, Iris M. Oppel, Rakesh Puttreddy, Jas S. Ward, Kari Rissanen, Roland Fröhlich, Markus Albrecht|2020|Chem.-Eur.J.|26|1396|doi:10.1002/chem.201904639
CCDC 1539539: Experimental Crystal Structure Determination
2020
Related Article: David Van Craen, Wolfgang H. Rath, Marina Huth, Laura Kemp, Christoph Räuber, Jan M. Wollschläger, Christoph A. Schalley, Arto Valkonen, Kari Rissanen, Markus Albrecht|2017|J.Am.Chem.Soc.|139|16959|doi:10.1021/jacs.7b10098
CCDC 1917415: Experimental Crystal Structure Determination
2020
Related Article: A. Carel N. Kwamen, Marcel Schlottmann, David Van Craen, Elisabeth Isaak, Julia Baums, Li Shen, Ali Massomi, Christoph Räuber, Benjamin P. Joseph, Gerhard Raabe, Christian Göb, Iris M. Oppel, Rakesh Puttreddy, Jas S. Ward, Kari Rissanen, Roland Fröhlich, Markus Albrecht|2020|Chem.-Eur.J.|26|1396|doi:10.1002/chem.201904639