Publication


Featured researches published by David J. Williams.


Angewandte Chemie | 2001

Host–Guest Chemistry Aids and Abets a Stereospecific Photodimerization in the Solid State

Dafni G. Amirsakis; Miguel A. Garcia-Garibay; Stuart J. Rowan; J. Fraser Stoddart; Andrew P. White; David J. Williams

A bis(dialkylammonium ion)-substituted stilbene derivative cocrystallizes with bisparaphenylene[34]crown-10 to form, in the solid state, a 2:2 host-guest complex wherein the stilbene double bonds are aligned with a relative geometry suitable for a stereospecific photochemical [2+2] cycloaddition. When irradiated with white light, this crystalline complex forms a single diastereoisomer of the corresponding cyclobutane derivative, the stereochemistry of which has been determined unambiguously in the solid state by X-ray crystallography to be syn-anti-syn.


Chemical Communications | 1996

THE GENESIS OF A NEW RANGE OF INTERLOCKED MOLECULES

Peter T. Glink; Cesare Schiavo; J. Fraser Stoddart; David J. Williams

Secondary dialkylammonium ions self-assemble with suitably sized macrocyclic polyethers, such as the well-known dibenzo-24-crown-8 and bis-p-phenylene-34-crown-10, into pseudorotaxane superstructures in (a) solution, (b) the solid state and (c) the ‘gas phase’.


Journal of The Chemical Society-dalton Transactions | 1997

THIAMACROCYCLIC CHEMISTRY : SYNTHESIS OF A NOVEL OXADITHIACROWN AND ITS COPPER IODIDE COMPLEX

Peter R. Ashton; Andrew L. Burns; Christian G. Claessens; George K. H. Shimizu; Karen Small; J. Fraser Stoddart; Andrew J. P. White; David J. Williams

A mixed oxa–thia macrocycle incorporating a rigid n‘horseshoe-shaped’ aromatic moiety, n1,11,21-trioxa-8,14-dithia[2,9,2]paracyclophane, L, has been nsynthesised. The molecular structures of L and of its copper iodide ncomplex have been determined by single-crystal X-ray diffraction nmethods. There are two independent conformations observed in the solid nstate for the macrocycle, L. Its copper iodide complex n[Cu n 2 nI n 2 n(L)]·1.25MeCN, crystallises, nin a 2∶1 metal∶crown ratio, as a one-dimensional infinite narray of cubane-like units consisting of four copper atoms, four iodine natoms and four sulfur atoms from four different macrocycles.


Journal of The Chemical Society, Chemical Communications | 1995

Cyclophanes with self-recognising components

Pier-Lucio Anelli; Masumi Asakawa; Peter R. Ashton; George Robert Brown; Wayne Hayes; Oldrich Kocian; Santiago Rodríguez Pastor; J. Fraser Stoddart; Malcolm S. Tolley; Andrew J. White; David J. Williams

High dilution techniques have been employed to construct a series of charged flexible cyclophanes comprised of π-electron-rich hydroquinone and π-electron-deficient bipyridinium residues linked by polyether spacer units of varying length: significant conformational changes, leading to intramolecular and intermolecular interactions between the π-donors and π-acceptors, have been observed—as evidenced by X-ray crystallographic and variable temperature 1H NMR and 2D ROESY spectroscopic investigations—within the series of the cyclophanes both in the solid and solution states as a result of increasing the lengths of the polyether spacer units.


Journal of the American Chemical Society | 1996

Self-Assembly, Spectroscopic, and Electrochemical Properties of [n]Rotaxanes1

Peter R. Ashton; Roberto Ballardini; Vincenzo Balzani; Martin Bělohradský; Maria Teresa Gandolfi; Douglas Philp; Luca Prodi; Françisco M. Raymo; Mark V. Reddington; Neil Spencer; J. Fraser Stoddart; and Margherita Venturi; David J. Williams


Journal of Organic Chemistry | 2001

Supramolecular Daisy Chains

Stuart J. Cantrill; Gilmer J. Youn; J. Fraser Stoddart; David J. Williams


Journal of the American Chemical Society | 1998

Oligocatenanes made to order

David B. Amabilino; Peter R. Ashton; Vincenzo Balzani; Sue E. Boyd; Alberto Credi; Ju Young Lee; Stephan Menzer; J. Fraser Stoddart; Margherita Venturi; David J. Williams


Journal of the American Chemical Society | 1993

Molecular belts. 2. Substrate-directed syntheses of belt-type and cage-type structures

Peter R. Ashton; Ulrich Girreser; Daniele Giuffrida; Franz H. Kohnke; John P. Mathias; Françisco M. Raymo; Alexandra M. Z. Slawin; J. Fraser Stoddart; David J. Williams


Journal of the American Chemical Society | 1997

CONTROLLING CATENATIONS, PROPERTIES AND RELATIVE RING-COMPONENT MOVEMENTS IN CATENANES WITH AROMATIC FLUORINE SUBSTITUENTS

Roberto Ballardini; Vincenzo Balzani; Alberto Credi; Christopher L. Brown; Richard E. Gillard; Marco Montalti; Douglas Philp; J. Fraser Stoddart; Margherita Venturi; Andrew J. P. White; Brian John Williams; David J. Williams


Journal of the American Chemical Society | 1997

A supramolecular analog of the photosynthetic special pair

M.C. Feiters; Matthew C. T. Fyfe; M.V. Martinez Diaz; S. Menzer; Roeland J. M. Nolte; J.F. Stoddart; P.J.M. van Kan; David J. Williams

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