Paul N. W. Baxter

Institut Charles Sadron

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Jean‐Maríe Lehn

Institut de Science et d'Ingénierie Supramoléculaires

J.-M. Lehn

Institut de Science et d'Ingénierie Supramoléculaires

Abdelaziz Al Ouahabi

Institut Charles Sadron

Dieter Fenske

Karlsruhe Institute of Technology

Joseph A. Connor

University of Greenwich

Alexandre Varnek

Université de Strasbourg

J. M. Gregg

Queen's University Belfast

R. M. Bowman

Queen's University Belfast

K. Rissanen

Violetta Patroniak

Adam Mickiewicz University in Poznań

Cooperative Institutions

Robert Bosch (Germany)

146

Centre National de la Recherche Scientifique

Université de Strasbourg

Chinese Academy of Sciences

University of Chinese Academy of Sciences

Institut de Science et d'Ingénierie Supramoléculaires

Institut de Chimie

Queen's University Belfast

Institut de Chimie de Strasbourg

Laboratoire de Chimie

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Synthesis and Properties of a Twistophane Ion Sensor: A New Conjugated Macrocyclic Ligand for the Spectroscopic Detection of Metal Ions

The Journal of Organic Chemistry (2001)

Paul N. W. Baxter

The synthesis of a structurally new type of conjugated macrocyclic ligand (1) is reported that comprises a dehydroannulene framework incorporating two 2,2'-bipyridine units. Modeling studies showed the ligand to possess an unusual chirally twisted and relatively rigid architecture capable of binding metal ions in an enforced tetrahedral coordination geometry. The macrocycle was prepared in seven steps from (2-bromophenylethynyl)-trimethylsilane (2) and characterized by spectroscopic techniques. The pyridine H3 protons in the 1H NMR spectrum of 1 showed a marked temperature dependencey that may be related to conformational opening and closing motions of the macrocyclic ring. Ligand 1 was found to spectroscopically detect the presence of Co2+, Ni2+, Cu2+, and Zn2+ and, in particular, to function as a multiple readout sensor, giving different sequences of signal output depending upon the type of metal ion analyte with which the system was addressed. Macrocycle 1 also gave a highly characteristic and specific visual output response in the presence of Zn2+ consisting of a bright turquoise fluorescence and in this respect may find applications in the sensing of this biologically important metal ion.

Macrocyclic ligand

10.1021/jo001777d

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Citations (53)

Bidentate Lewis Base Adducts of Methyltrioxidorhenium(VII): Ligand Influence on Catalytic Performance and Stability

European Journal of Inorganic Chemistry (2009)

Mingdong Zhou Kavita R. Jain Alev Günyar Paul N. W. Baxter Eberhardt Herdtweck

Abstract Methyltrioxidorhenium (MTO) forms 1:1 adducts of the general formula CH 3 ReO 3 · L 2 with bidentate Lewis bases (L 2 = 5,5′‐dimethyl‐2,2′‐bipyridine, 5,5′‐diamino‐2,2′‐bipyridine, 4,4′‐dibromo‐2,2′‐bipyridine, 5,5′‐dibromo‐2,2′‐bipyridine, diethyl 2,2′‐bipyridine‐5,5′‐dicarboxylate, 1,10‐phenanthroline‐5,6‐dione, 3,6‐di(2‐pyridyl)pyridazine). Due to the steric demands of the ligands, the complexes display a distorted octahedral geometry as confirmed by solid state X‐ray crystallography. The rhenium center is disordered in all examined crystal structures. The complexes synthesized are thermally stable but sensitive to light and moisture. The 2,2′‐bipyridine derived complexes exhibit good catalytic activities for cyclooctene epoxidation in a biphasic H 2 O 2 /organic solvent catalytic system using hydrogen peroxide as oxidizing agent. The functional groups on the bipyridine rings play an important role with respect to the differences in formation, stability and activity of the complexes. Their influence depends largely on their electron donor capabilities. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)

Bipyridine

2,2'-Bipyridine

Pyridazine

Cyclooctene

10.1002/ejic.200900260

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Citations (34)

CCDC 100241: Experimental Crystal Structure Determination

The Cambridge Structural Database (1997)

Paul N. W. Baxter Hanadi F. Sleiman J.-M. Lehn K. Rissanen

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/cc3c9lb

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CCDC 205463: Experimental Crystal Structure Determination

The Cambridge Structural Database (2004)

Violetta Patroniak Paul N. W. Baxter J.-M. Lehn M. Kubicki Maija Nissinen

Crystal (programming language)

10.5517/cc6wsvp

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Mechanistic Features, Cooperativity, and Robustness in the Self-Assembly of Multicomponent Silver(I) Grid-Type Metalloarchitectures

Angewandte Chemie (2002)

Annie Marquis Jean‐Pierre Kintzinger R. Graff Paul N. W. Baxter Jean‐Marie Lehn

Ein Ag-[3×3]-Gitter entsteht nach einem hoch komplexen Mechanismus, bei dem mehrere Intermediate eine Rolle spielen, die bei verschiedenen Metall-Ligand-Verhältnissen erhalten werden. Durch NMR-Untersuchungen ließen sich die Strukturen dieser Spezies ermitteln, und es wurde festgestellt, dass starke Kooperativität beim letzten Schritt (siehe Schema) des Aufbaus dieses stabilen Gitters auftritt.

Cooperativity

10.1002/1521-3757(20020802)114:15<2884::aid-ange2884>3.0.co;2-8

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Synthesis of oligoarylacetylenes with defined conjugated sequences using tailor-made soluble polymer supports

Chemical Communications (2017)

Róża Szweda Christophe Chendo Laurence Charles Paul N. W. Baxter Jean‐François Lutz

The use of polystyrene-based soluble polymer supports greatly simplifies the synthesis and characterization of self-aggregating sequence-defined oligoarylacetylenes.

Polystyrene

Characterization

Sequence (biology)

10.1039/c7cc03633g

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Citations (28)

Self-Assembly, Characterisation, and Crystal Structure of Multinuclear Metal Complexes of the [2×3] and [3×3] Grid-Type

Chemistry - A European Journal (2002)

Esther Breuning Garry S. Hanan Francisco J. Romero‐Salguero Ana M. García Paul N. W. Baxter

The self-assembly of new multimetallic complexes of grid-type architecture is described. The binding of a set of tris-terdentate ligands, 1 a-1 d, based on terpyridine-like subunits, with different octahedrally coordinated metal ions leads to the formation of species whose structure depends strongly on the ligand, the metal ion, the counterion, the solvent, and the reaction conditions. Under suitable conditions, the [3 x 3] grid was obtained from the reaction of ligand 1 a with zinc tetrafluoroborate and from ligand 1 b with mercury triflate. The other ligands led to the formation of mainly one compound of composition [M(6)L(5)](12+), which has the structure of an incomplete [2 x 3] grid. The crystal structure of such a [2 x 3] grid, [Co(6)(1 d)(5)](12+), has been determined. In this complex, the three central pyrimidine-pyridine-pyrimidine non-coordinating sites adopt transoid NCbond;CN conformations. The much less stable cisoid conformations, the "pinching" of the coordination sites in the complex, the weaker donor strength of the central binding site, and the steric demand of the substituents are all factors contributing to the reluctance to produce the [3 x 3] structure. A subtle interplay between the nature of the metal, the steric demand of the ligand, the reaction conditions, and the type of counterion determine the product of self-assembly. The results obtained show that by tuning the parameters, complexes containing six or nine octahedrally coordinated metal ions in a well-defined grid-type arrangement are accessible. Both types of arrays, [2 x 3] and [3 x 3 ], are of interest as self-assembled inorganic architectures of well-defined structure and nuclearity that may be suitable prototypes for selective information storage media.

10.1002/1521-3765(20020802)8:15<3458::aid-chem3458>3.0.co;2-y

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The Design and Generation of Inorganic Cylindrical Cage Architectures by Metal-Ion-Directed Multicomponent Self-Assembly

Chemistry - A European Journal (1999)

Paul N. W. Baxter Jean‐Maríe Lehn Gerhard Baum Dieter Fenske

The multicomponent self-assembly of ditopic linear ligands, circular ligands and copper(I) or silver(I) ions leads to the exclusive formation of a series of cylindrical inorganic architectures containing an internal cavity whose height may be modulated by the nature of the ligands used (see picture: 1: 20 Å; 2: 33 Å). The same reactions with tritopic and tetratopic linear ligands and circular tritopic ligands generates tri- (3) and tetracompartmental (4) cylindrical architectures of nanometric size in one stroke by a process involving the spontaneous positioning of up to 19 particles and the formation of up to 48 coordination bonds.

Cage

10.1002/(sici)1521-3765(19990104)5:1<102::aid-chem102>3.0.co;2-s

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Citations (165)

Synthesis of a Hexagonal Nanosized Macrocyclic Fluorophore with Integrated Endotopic Terpyridine Metal-Chelation Sites.

HAL (Le Centre pour la Communication Scientifique Directe) (2003)

Paul N. W. Baxter

Terpyridine

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CCDC 145033: Experimental Crystal Structure Determination