A5050123327- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Supramolecular Chemistry and Complexes
- Crystallography and molecular interactions
- Chemical Synthesis and Analysis
- Origins and Evolution of Life
- Molecular Junctions and Nanostructures
- Molecular Sensors and Ion Detection
- Surface Chemistry and Catalysis
- Supramolecular Self-Assembly in Materials
- Asymmetric Synthesis and Catalysis
- Porphyrin and Phthalocyanine Chemistry
- Photoreceptor and optogenetics research
- Luminescence and Fluorescent Materials
- Click Chemistry and Applications
- DNA and Nucleic Acid Chemistry
- Fluorine in Organic Chemistry
- Organic Chemistry Cycloaddition Reactions
- Synthesis and Properties of Aromatic Compounds
- Gene Regulatory Network Analysis
- Chemical Reaction Mechanisms
- Mesoporous Materials and Catalysis
- DNA and Biological Computing
- Fullerene Chemistry and Applications
- Synthesis and Catalytic Reactions
University of St Andrews
2012-2023
Northwestern University
2019-2020
St. Andrews University
2015-2017
NHS Fife
2016-2017
Conemaugh Memorial Medical Center
2017
University of Birmingham
1995-2006
University of Reading
2003
University of York
2003
University of Wisconsin–Madison
2003
World Scientific (Singapore)
1995
Abstract Although there are no fundamental factors hindering the development of nanoscale structures, is a growing realization that “engineering down” approaches, in other words reduction size structures generated by lithographic techniques below present lower limit roughly 1 μm, may become impractical. It has, therefore, increasingly clear only understanding self‐assembly large‐scale biological which exist and function at beyond nanoscale, downwards , extension our knowledge regarding...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular meccano. 1. [2]Rotaxanes and a [2]catenane made to orderPier Lucio Anelli, Peter R. Ashton, Roberto Ballardini, Vincenzo Balzani, Milagros Delgado, Maria Teresa Gandolfi, Timothy T. Goodnow, Angel E. Kaifer, Douglas Philp, Cite this: J. Am. Chem. Soc. 1992, 114, 1, 193–218Publication Date (Print):January 1992Publication History Published online1 May 2002Published inissue 1 January...
Abstract Zwar steht der Entwicklung von nanometergroßen Strukturen prinzipiell nichts im Wege, doch setzt sich immer mehr die Auffassung durch, daß Strukturminiaturisierungen unter gegenwärtig durch lithographische Techniken erreichbare 1‐μ‐Grenze als nicht praktikabel erweisen werden. Es wurde daher deutlich, nur ein grundlegendes Verständnis Selbstorganisation funktionellen makroskopischen biologischen mit Abmessungen Nanometerbereich und sogar darunter (Verkleinerungsansatz) Erweiterung...
A simple motif for molecular recognition—the binding of disubstituted ammonium salts, example dibenzyl- and di-n-butylammonium hexaflurophosphate, with crown ethers like dibenzo[24]crown-8—results in the self-assembly threaded 1:1 complexes 1. The superstructures these are stabilized by hydrogen bonds, electrostatic pole–dipole interactions, dispersive interactions.
Macroscopic electric motors continue to have a large impact on almost every aspect of modern society. Consequently, the effort towards developing molecular
A logical approach to the establishment of concept self-assembly processes, which mimic those found in nature, is proposed for synthesis ordered molecular and polymolecular arrays from readily available starting materials. The order, characterises unnatural products that result, could lead development new materials with functions, as well forms. synthetic strategy we have adopted relies upon use mechanically interlocked components, shape catenanes rotaxanes, provide means transposing, a...
The unthreading and rethreading of pseudorotaxane 1, which contains two p-phenylene spacers linking bipyridinium units a central 5-naphthalenediyl unit, is reversible when an initially oxygen-free solution 1 in water also containing 9-anthracenecarboxylic acid as photosensitizes triethanolamine "sacrificial" reluctant irradiated then aerated. absorption emission spectra the provide conclusive evidence.
Synthetic approaches to self-assembling [n]rotaxanes incorporating π-electron deficient bipyridinium-based dumbbell-shaped components and rich hydroquinone-based macrocycles have been developed. In particular, the so-called slippage methodology relies upon size complementarity of preformed macrocyclic components. The spontaneous self-assembly these complementary into a rotaxane in solution can be achieved under influence an appropriate amount thermal energy. absorption spectra, luminescence...
Transferable skills: Enantiomerically pure isothioureas promote the O- to C-carboxyl group transfer of oxazolyl carbonates with excellent levels enantiocontrol (see scheme). The origin enantioselectivity this process was probed mechanistically and rationalized computationally.
The fate of a dynamic combinatorial library is determined by coupling the exchange processes to synthetic replicator. replicating template capable exploiting and dominating exchanging pool reagents in order amplify its own formation at expense other species (see picture) through non-linear kinetics inherent minimal replication. Detailed facts importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made...
Abstract Examples of chemical systems capable templating and catalyzing their own synthesis – so‐called replicating have begun to appear in the literature over last 20 years. For biologist, these represent a link with origin life study can perhaps shed light on prebiotic evolution. synthetic chemist, they ultimate machine, production large number perfect copies themselves from single original molecule. One driving forces behind this research area has been recognition important role that...
The efficient preparation of single-crystalline ionic polymers and fundamental understanding their structure-property relationships at the molecular level remains a challenge in chemistry materials science. Here, we describe single-crystal structure highly ordered polycationic polymer (polyelectrolyte) its proton conductivity. polyelectrolyte single crystals can be prepared on gram-scale quantitative yield, by taking advantage an ultraviolet/sunlight-induced topochemical polymerization, from...
Abstract Photochemical control of a self‐assembled supramolecular 1:1 pseudorotaxane (formed between tetracationic cyclophane, namely the tetrachloride salt cyclobis(paraquat‐ p ‐phenylene), and 1,5‐bis[2‐(2‐(2‐hydroxy)ethoxy)ethoxy]naphthalene) has been achieved in aqueous solution. The photochemical one‐electron reduction cyclophane to radical trication weakens noncovalent bonding interactions naphthalene guest—π‐π π‐electron‐rich π‐electron‐poor aromatic systems, hydrogen‐bonding acidic...
The powerful π-electron donor, tetrathiafulvalene, forms a strong green-coloured 1 : complex with the accepting tetracationic cyclophane, cyclobis(Paraquat-p-phenylene), in both solid and solution states as demonstrated by X-ray crystallography spectroscopy (NMR UV–VIS), respectively.
Abstract A number of nanometer‐scale molecular assemblies, based on rotaxane‐type structures, have been synthesized by means a template‐directed strategy from simple building blocks that, account the recognition arising noncovalent interactions between them, are able to self‐assemble into potential abacuses. In all cases investigated, π‐electron‐deficient tetracationic cyclophane cyclobis(paraquat‐ p ‐phenylene) is constrained mechanically around dumbbell‐shaped component consisting linear...
Abstract A number of new families titanium and mixed plus chromium oxides has been discovered, their structures all being derived from the rutile type by crystallographic shear. Different have different CS planes (hkl), members a family are distinguished spacing these planes. All may be described as ordered intergrowths (121) (011) APB structures, with uniform mixing. The very small intervals between compositions many phases suggest that virtually continuous but solid solutions possible.
The exploitation of size-complementarity between the macrocyclic component and stoppers dumbbell a [2]rotaxane, together with stabilising noncovalent bonding interactions that create thermodynamic trap, have permitted development an alternative method, which can be termed slippage, for syntheses [2]rotaxanes in good yields.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular organization via ionic interactions at interfaces. 1. Monolayers and LB films of cyclic bisbipyridinium tetracations dimyristoylphosphatidic acidRamesh C. Ahuja, Pier Lorenzo Caruso, Dietmar Moebius, Gerald Wildburg, Helmut Ringsdorf, Douglas Philp, J. F. Stoddart, Jon A. PreeceCite this: Langmuir 1993, 9, 6, 1534–1544Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June...
A strategy for the construction of a [2]rotaxane—comprised dumbbell-shaped component containing two π-electron-deficient 4,4′-bipyridinium units encircled by one π-electron-rich bisparaphenylene-34-crown-10 macrocycle—by constitutionally determined self-assembly process is described.