49 Works

Pronounced pH effects on the kinetics of cucurbit[7]uril-based pseudorotaxane formation and dissociation

Angel E. Kaifer, Vladimir Sindelar, Wei Li & Serena Silvi
Deprotonation of the two terminal COOH groups on a 4,4′-bipyridinium linear derivative leads to a pronounced slow down on the kinetics of threading and unthreading by the cucurbit[7]uril host.

Inclusion of Carboxyl Function Inside of Cucurbiturils and its Use in Molecular Switches

Viktor Kolman, Petr Kulhanek & Vladimir Sindelar
Organic flip-flop: Cucurbit[n]uril hosts (where n=7,8) and dipyridinium guests form stable inclusion complexes in which the central carboxyl function can be included inside the host cavity. The pseud...

Global maps of current (1979-2013) and future (2061-2080) habitat suitability probability for 1,485 European endemic plant species

Robin Pouteau, Idoia Biurrun, Caroline Brunel, Milan Chytrý, Wayne Dawson, Franz Essl, Trevor Fristoe, Rense Haveman, Carsten Hobohm, Florian Jansen, Holger Kreft, Jonathan Lenoir, Bernd Lenzner, Carsten Meyer, Jesper Erenskjold Moeslund, Jan Pergl, Petr Pyšek, Jens-Christian Svenning, Wilfried Thuiller, Patrick Weigelt, Thomas Wohlgemuth, Qiang Yang & Mark Van Kleunen
Aims: The rapid increase in the number of species that have naturalized beyond their native range is among the most apparent features of the Anthropocene. How alien species will respond to other processes of future global changes is an emerging concern and remains largely misunderstood. We therefore ask whether naturalized species will respond to climate and land-use change differently than those species not yet naturalized anywhere in the world. Location: Global Methods: We investigated future...

Disentangling responses to natural stressor and human impact gradients in river ecosystems across Europe

Rachel Stubbington, Romain Sarremejane, Alex Laini, Núria Cid, Zoltán Csabai, Judy England, Antoni Munné, Tom Aspin, Núria Bonada, Daniel Bruno-Collados, Sophie Cauvy-Fraunie, Richard Chadd, Claudia Dienstl, Pau Fortuño, Wolfram Graf, Cayetano Gutiérrez-Cánovas, Andy House, Ioannis Karaouzas, Eleana Kazila, Andrés Millán, Maria Morais, Petr Pařil, Alex Pickwell, Marek Polášek, David Sánchez-Fernández … & Thibault Datry
1. Rivers are dynamic ecosystems in which both human impacts and climate-driven drying events are increasingly common. These anthropogenic and natural stressors interact to influence the biodiversity and functioning of river ecosystems. Disentangling ecological responses to these interacting stressors is necessary to guide management actions that support ecosystems adapting to global change. 2. We analysed the independent and interactive effects of human impacts and natural drying on aquatic invertebrate communities—a key biotic group used to...

Supramolecular binding and release of sulfide and hydrosulfide anions in water

Julián Vázquez Gonzálvez & Vladimir Sindelar
Bambusuril macrocycles bind and release sulfide and hydrosulfide anions in water.

Supramolecular Storage and Controlled Photorelease of an Oxidizing Agent using a Bambusuril Macrocycle

Edoardo Torti, Václav Havel, Mirza A. Yawer, Lucie Ludvíková, Michal Babiak, Petr Klán & Vladimir Sindelar
Abstract The oxidizing ability of peroxodisulfate upon complexation inside the Bambusuril macrocycle cavity is inhibited. This dianionic agent can be released on demand from its stable 1:1 complex ...

Synthesis and supramolecular properties of glycoluril tetramer

Marek Stancl, Laura Gilberg, Lukas Ustrnul, Marek Necas & Vladimir Sindelar
(2014). Synthesis and supramolecular properties of glycoluril tetramer. Supramolecular Chemistry: Vol. 26, Eighth International Symposium of Macrocyclic and Supramolecular Chemistry (ISMSC-8), pp. 168-172.

Binding of bambusuril with bipyridinium guests in water

Kristina Sleziakova, Mehdi Rashvand Avei, Angel E. Kaifer & Vladimir Sindelar
(2018). Binding of bambusuril with bipyridinium guests in water. Supramolecular Chemistry: Vol. 30, SI: ISMSC, pp. 832-837.

Novel Supramolecular Hosts Based on Linear and Cyclic Oligomers of Glycoluril

Vladimir Sindelar, Marek Stancl & Jan Svec
We report here on supramolecular objects containing glycoluril units and functioning as host molecules. The present paper contains a detailed discussion on the synthetic approaches leading to methyle...

Real-time analysis of multiple anion mixtures in aqueous media using a single receptor

Vaclav Havel, Mirza Arfan Yawer & Vladimir Sindelar
Bambusuril macrocycles allow qualitative and quantitative sensing of anion mixtures in water using 1H NMR spectroscopy.

Acyclic cucurbit[n]uril-type molecular containers: influence of glycoluril oligomer length on their function as solubilizing agents

Laura Gilberg, Ben Zhang, Peter Y. Zavalij, Vladimir Sindelar & Lyle Isaacs
A series of glycoluril molecular clips and acyclic CB[n]-type receptors are tested as solubilizing agents for insoluble drugs.

Update on maxima of fine-scale vascular plant species richness in a Transylvanian steppe meadow

Jan Roleček, Pavel Dřevojan, Petra Hájková, Irina Goia & Michal Hájek
We report new maxima of vascular plant species richness ever recorded in 10-m2 plots (115 and 110 species in two adjacent plots). Both come from a steppe meadow at a well-known site Valea Lui Craiu, located in the Fânaţele Clujului grassland complex close to the city of Cluj in Transylvania, Romania, where maximum values have been observed before. We also correct the previously pub-lished maximum of 106 species, which was recorded in a 10.9-m2 plot...

Data from: The leaf economic and plant size spectra of European forest understory vegetation

Josep Padullés Cubino, Idoia Biurrun, Gianmaria Bonari, Tatiana Braslavskaya, Xavier Font, Ute Jandt, Florian Jansen, Valerijus Rašomavičius, Wolfgang Willner & Milan Chytrý
Forest understories play a vital role in ecosystem functioning and the provision of ecosystem services. However, the extent to which environmental conditions drive dominant ecological strategies in forest understories at the continental scale remains understudied. Here, we used ~29,500 forest vegetation plots sampled across Europe and classified into 25 forest types to explore the relative role of macroclimate, soil pH, and tree canopy cover in driving abundance-weighted patterns in the leaf economic spectrum (LES) and...

Interaction between hunting strategy, habitat type and stratum drive intraguild predation and cannibalism

Radek Michalko, Radek Michalko, Klaus Birkhofer & Stano Pekár
Intraguild predation (IGP) is a common interaction between generalist predators when they competitively exploit similar resources and prey on each other. Theoretical models predict limitations for intraguild predator coexistence unless some mechanisms, such as utilization of alternative prey (i.e., trophic niche partitioning) and cannibalism, increase the relative intraspecific clustering and interspecific segregation. As hunting strategies determine trophic niches of predators and their own vulnerability to predation, the hunting strategies may also determine the relative importance...

Dataset for estimation of the biotic and climatic niche breadths and geographic range size of beech (Fagus) species worldwide

Qiong Cai, Erik Welk, Chengjun Ji, Wenjing Fang, Francesco Maria Sabatini, Jianxiao Zhu, Jiangling Zhu, Zhiyao Tang, Fabio Attorre, Juan Antonio Campos, Andraž Čarni, Milan Chytrý, Süleyman Çoban, Jürgen Dengler, Jiri Dolezal, Richard Field, József Pál Frink, Hamid Gholizadeh, Adrian Indreica, Ute Jandt, Dirk Nikolaus Karger, Jonathan Lenoir, Robert K. Peet, Remigiusz Pielech, Michele De Sanctis … & Helge Bruelheide
This dataset could be used to test whether the commonly observed positive range size–niche breadth relationship, as posited by the “niche breadth hypothesis”, exists for Fagus, one of the most dominant and widespread broad‐leaved deciduous tree genera in temperate forests of the Northern Hemisphere. There are many ways to estimate niche breadth. Here, we estimated biotic and climatic niche breadths per species using plot‐based co‐occurrence data and climate data, respectively. The range sizes of the...

Hypervalent Iodine Based Reversible Covalent Bond in Rotaxane Synthesis

Markéta Kandrnálová, Zoran Kokan, Václav Havel, Marek Nečas & Vladimir Sindelar
The interlocked bambusuril: Reactive hypervalent iodine species possessing dynamic covalent bonds are utilized in a constitutive sense for the near quantitative synthesis of rotaxanes via the stabili...

Anion Binding by Bambus[6]uril Probed in the Gas Phase and in Solution

Ágnes Révész, Detlef Schröder, Jan Svec, Michaela Wimmerová & Vladimir Sindelar
Electrospray ionization mass spectrometry (ESI-MS) is used to probe the binding of small anions to the macrocycle of bambus[6]uril. For the halide ions, the experimental patterns suggest F– < Cl– < Br– < I–, which is consistent with the order of anion binding found in the condensed phase. Parallel equilibrium studies in the condensed phase establish the association constants of halide anions and bambus[6]uril in mixed solvents. A detailed analysis of the mass spectrometric data...

Bambusuril as a One-Electron Donor for Photoinduced Electron Transfer to Methyl Viologen in Mixed Crystals

Vladimir Sindelar, Lucie Ludvíková, Michal Babiak, Petr Klán, Dominik Heger, Tomas Fiala, Jan Švec, Tomáš Slanina, L’ubica Vetráková, Marek Nečas & Petr Kulhánek
Methyl viologen hexafluorophosphate (MV2+·2PF6–) and dodecamethylbambus[6]uril (BU6) form crystals in which the layers of viologen dications alternate with those of a 1:2 supramolecular complex of BU6 and PF6–. This arrangement allows for a one-electron reduction of MV2+ ions upon UV irradiation to form MV+• radical cations within the crystal structure with half-lives of several hours in air. The mechanism of this photoinduced electron transfer in the solid state and the origin of the long-lived charge-separated...

Cucurbiturils Substituted on the Methylene Bridge

Vladimir Sindelar, Muhammad S. A. Khan, Laura Gilberg & Marketa Enderesova
Cucurbit[6]uril (CB[6]) with a substituent attached solely to one methylene bridge was prepared for the first time. The monosubstituted CB[6] undergoes self-assembly to form a cyclic tetramer in the solid state. The affinity of the monosubstituted CB[6] to a series of alkylammonium salts was measured revealing a minor effect of the substituent on the binding properties of the macrocycle.

Propanediurea-Based Molecular Clips Bind Halide Anions: An Insight into the Mechanism of Cucurbituril Formation

Tomas Lizal, Lukas Ustrnul, Marek Necas & Vladimir Sindelar
The synthesis and supramolecular properties of the first methylene-bridged propanediurea-based dimers are described. These dimers, bearing an aromatic sidewall, have the shape of molecular clips. Unlike glycoluril-based dimers, these clips neither dimerize nor accept any organic guests, due to their small cavities. Both propanediurea- and glycoluril-based dimers bind halide anions on the convex side of the molecules, even in highly polar organic solvents. This observation brings new insights into the mechanism of cucurbituril formation.

Effects of cucurbituril size on the binding of a lutidine guest

Jan Svec, Vladimir Sindelar & Angel E. Kaifer
Six- and seven-membered cucurbiturils form inclusion complexes with a lutidine derivative. These inclusion complexes differ in the binding mode, stability, kinetics of complexation, and sensitivity toward basic media.

Glycoluril‐Derived Molecular Clips are Potent and Selective Receptors for Cationic Dyes in Water

Nengfang She, Damien Moncelet, Laura Gilberg, Xiaoyong Lu, Vladimir Sindelar, Volker Briken & Lyle Isaacs
Abstract Molecular clip 1 remains monomeric in water and engages in host–guest recognition processes with suitable guests. We report the Ka values for 32 1⋅guest complexes measured by 1H NMR, UV/Vi...

Thermodynamics of Halide Binding to a Neutral Bambusuril in Water and Organic Solvents

Tomas Fiala, Kristina Sleziakova, Kamil Marsalek, Karolina Salvadori & Vladimir Sindelar
Driving forces of anion binding in water in contrast to nonpolar environments are of high interest because of their relevance to biology and medicine. Here we report a neutral bambusuril macrocycle (1), soluble in both water and nonpolar solvents due to decoration with 12 polyethylene glycol-based substituents. The new bambusuril has the highest affinity for I– in pure water ever reported for a synthetic macrocycle relying on hydrogen bonding interactions rather than metal coordination or...

Modulation of Bambusuril Anion Affinity in Water

Vaclav Havel, Michal Babiak & Vladimir Sindelar
Abstract Neutral and negatively charged anion receptors functioning in pure water are rare in supramolecular chemistry. Moreover, studies on adjusting the affinity of such receptors toward anions i...

Registration Year

  • 2021

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  • Masaryk University
  • Department of Physical and Technical Sciences
  • University of Miami
  • University of the Basque Country
  • Central European Institute of Technology
  • University of Vienna
  • Martin Luther University Halle-Wittenberg
  • University of Oviedo
  • Aarhus University
  • University of Picardie Jules Verne