A series of novel resorcin[4]arenes with extended it systems have been synthesised and developed as potassium-selective transporters. Resorcin[4]arenes that feature crown ether moieties function as efficient carriers of K+ across bulk liquid membranes showing enhanced selectivity over the other alkali metal ions relative to a model system (benzo[15]crown-5). Incorporation of functionalities suitable for pore formation, in addition to an extra annulus of aromatic residues, gives molecules which have remarkable ion-channel-mimicking behaviour in a biological lipid bilayer with outstanding K+/Na+ selectivity

Bommel, Kjeld J.C. van

Hulst, Ron

Huskens, Jurriaan

Jong, Menno R. de

Kooijman, Huub

Metselaar, Gerald A.

Reinhoudt, David N.

Spek, Anthony L.

Verboom, Willem

Several small, lipophilic rhenium complexes form inclusion complexes with native -cyclodextrin (-CD) and -CD dimers. Association constants larger than 109 M-1 were obtained using dimers. The use of -CD also enabled the synthesis of these rhenium complexes in water, in excellent yields, through complexation of the otherwise insoluble corresponding ligands. The influence of the reaction time and temperature on the configuration of the reaction products has been investigated in depth for one of these complexes. Using a -CD dimer, it proved possible to specifically template the formation of one configuration. The strength of the complexes of the rhenium complexes in cyclodextrin dimers may allow radiolabeling of biomolecules

van Bommel, Kjeld J.C.

de Jong, M.R.

Hulst, A.J.R.L.

Reinhoudt, David

University of Twente Research Information

English

Complexation and (templated) synthesis of rhenium complexes with cyclodextrins and cyclodextrin dimers in water

Qi, L.

Cölfen, H.

Antonietti, M.

Li, M.

Hopwood, J.

Ashley, A.

Mann, S.

MPG.PuRe

Formation of BaSO<sub>4</sub> fibres with morphological complexity in aqueous polymer solutions.

BaSO4 fibres with morphological complexity were formed in aqueous solution with polyacrylate and partially monophosphonated poly(ethyleneoxide)-block-poly(methacrylic acid) additives by a simple precipitation reaction. For polyacrylate, formation of the fibrous deposits was strongly dependent on the level of supersaturation (S) and Ba2+:polymer molar ratio (R). At S=60 to 80, and R=3 to 14, highly anisotropic crystalline fibres consisting of bundles of BaSO4 nanofilaments were formed after several weeks, although the yield was low. The nanofilaments were also organized into cone-shaped aggregates at S=80, and at lower R values these formed higher-order structures that consisted of multiple cone-on-cone assemblies with remarkable self-similarity. Increasing the supersaturation produced ovoid or cross-shaped dendritic particles for the range of molar ratios studied. In contrast, BaSO4 crystallisation in the presence of a partially phosphonated block copolymer gave a high yield of BaSO4 fibres up to 100 μm in length, and consisting of co-aligned bundles of 30 nm-diameter defect-free single-crystal nanofilaments with a uniform growth tip. A model for the defect-free growth of BaSO4 nanofilaments in aqueous polymer solutions based on amorphous precursor particles, vectorially directing forces and van der Waals attraction is proposed

Qi, Limin

Cölfen, Helmut

Antonietti, Markus

Li, Mei

Hopwood, Jeremy D.

Ashley, Alexandra J.

Mann, Stephen

University of Huddersfield Repository

Formation of BaSO4 Fibres with Morphological Complexity in Aqueous Polymer Solutions

Bommel, K.J.C.van

Verboom, W.

Huskens, J.

Hulst, R

Kooijman, H.

Spek, A.L.

Reinhoudt, D.N.

Metselaar, G.

NARCIS 

BaSO4 fibres with morphological complexity were formed in aqueous solution with polyacrylate and partially monophosphonated poly(ethyleneoxide)-block-poly(methacrylic acid) additives by a simple precipitation reaction. For polyacrylate, formation of the fibrous deposits was strongly dependent on the level of supersaturation (S) and Ba2+:polymer molar ratio (R). At S = 60 to 80, and R = 3 to 14, highly anisotropic crystalline fibres consisting of bundles of BaSO4 nanofilaments were formed after several weeks, although the yield was low. The nanofilaments were also organized into cone-shaped aggregates at S = 80, and at lower R values these formed higher-order structures that consisted of multiple cone-on-cone assemblies with remarkable self-similarity. Increasing the supersaturation produced ovoid or cross-shaped dendritic particles for the ran-e of molar ratios studied. In contrast, BaSO4 crystallisation in the presence of a partially phosphonated block copolymer gave a high yield of BaSO4 fibres up to 100 mum in length, and consisting of co-aligned bundles of 30 nm-diameter defect-free single-crystal nanofilaments with a uniform growth tip. A model for the defect-free growth of BaSO4 nanofilaments in aqueous polymer solutions based on amorphous precursor particles, vectorially directing forces and van der Waals attraction is proposed.Chemistry, MultidisciplinarySCI(E)0ARTICLE163526-3532

Qi, LM

Colfen, H

Antonietti, M

Li, M

Hopwood, JD

Ashley, AJ

Mann, S

Institutional Repository of Peking University

Chemistry - A European Journal

Formation of BaSO4 fibres with morphological complexity in aqueous   polymer solutions

Vlaar, M.J.M.

Ehlers, A.W.

Schakel, M.

Clendenning, S.B.

Nixon, J.F.

Lutz, M.

Spek, A.L

Lammertsma, K.

VU Research Portal

Reaction of a complexed phosphinidene with 2,4,6-tri-tert-butyl-1,3,5-triphosphabenzene

BaSO4 fibres with morphological complexity were formed in aqueous solution with polyacrylate and partially monophosphonated poly(ethyleneoxide)-block-poly(methacrylic acid) additives by a simple precipitation reaction. For polyacrylate, formation of the fibrous deposits was strongly dependent on the level of supersaturation (S) and Ba2+:polymer molar ratio (R). At S=60 to 80, and R=3 to 14, highly anisotropic crystalline fibres consisting of bundles of BaSO4 nanofilaments were formed after several weeks, although the yield was low. The nanofilaments were also organized into cone-shaped aggregates at S=80, and at lower R values these formed higher-order structures that consisted of multiple cone-on-cone assemblies with remarkable self-similarity. Increasing the supersaturation produced ovoid or cross-shaped dendritic particles for the range of molar ratios studied. In contrast, BaSO4 crystallisation in the presence of a partially phosphonated block copolymer gave a high yield of BaSO4 fibres up to 100 μm in length, and consisting of co-aligned bundles of 30 nm-diameter defect-free single-crystal nanofilaments with a uniform growth tip. A model for the defect-free growth of BaSO4 nanofilaments in aqueous polymer solutions based on amorphous precursor particles, vectorially directing forces and van der Waals attraction is proposed.publishe

Konstanzer Online-Publikations-System

Formation of BaSO<sub>4</sub> Fibres with Morphological Complexity in Aqueous Polymer Solutions

Bommel, K.J.C.