Extension of a π-stacked N2S ligand to form bi- and tri-nuclear silver(i) complexes

Caradoc-Davies, Paula L.; Hanton, Lyall R.; Lee, Kitty

doi:10.1039/a910342m

Cited by 27 publications

(19 citation statements)

References 10 publications

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“…It has also been proved that careful selection of appropriate ligands is crucial to the construction of speci®c supramolecular architectures. This concept is demonstrated by the great variety of structural topologies of discrete supramolecular complexes or in®nite supramolecular arrays, such as molecular grids, racks, bricks, rings, boxes, honeycombs and helicates (Fei et al, 2000;Caradoc-Davies et al, 2000). In general, (i) the multiple coordination sites of the ligand incline towards forming higher dimensions and (ii) the long chain of the ligand may generate a larger cavity or channel in the assembly reaction with metal ions.…”

Section: Commentmentioning

confidence: 99%

Poly[[diaquacobalt(II)]-μ-4,4′-bipyridine-κ²N:N′-μ-p-phenylenebis(oxyacetato)-κ²O:O′]

Tang

Dai

et al. 2005

Acta Crystallogr C

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The title compound, [CoII(C10H8O6)(C10H8N2)(H2O)2]n, was obtained by the hydrothermal reaction of CoSO(4) with benzene-1,4-dioxydiacetate [systematic name: p-phenylenebis(oxyacetate)] and 4,4'-bipyridine (4,4'-bpy). The Co atom lies at an inversion center and the benzene-1,4-dioxydiacetate and 4,4'-bipyridine moieties lie about other inversion centers. The benzene-1,4-dioxydiacetate ligands bridge the octahedral Co(II) coordination centers, forming a one-dimensional zigzag chain. The chains are further bridged by 4,4'-bpy ligands, forming a novel two-dimensional supramolecular architecture. Hydrogen-bonding interactions between the coordinated water molecules and the carboxylate O atoms lead to the formation of a three-dimensional network structure.

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Section: Commentmentioning

confidence: 99%

Poly[[diaquacobalt(II)]-μ-4,4′-bipyridine-κ²N:N′-μ-p-phenylenebis(oxyacetato)-κ²O:O′]

Tang

Dai

et al. 2005

Acta Crystallogr C

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“…1 Helicates have been extensively investigated during the last decade, 1b,c and the recognised approaches to such molecules imply the use of metal-ion induced self-assembly of ligand threads containing repeating donor units of certain denticity, so that the binding abilities of the ligand domains need to match to the stereochemical requirements of the metal ions. 1b,c,2, 3 We are currently interested in design of ligand systems capable to form polynuclear complexes which can provide adequate models for bimetallic active sites of metalloenzymes where the control of metal-metal separation and thus functional activity is modulated by presence of a third, allosteric metal ion. 4 In this context, we have prepared a new polynucleating ligand L (Scheme 1), and its mono-and poly-nuclear complexes.…”

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confidence: 99%

Control of molecular topology by stereochemical preferences of metal ions: double helical versus side-by-side structures in tetranuclear copper(ii) and nickel(ii) complexes

Krämer

Fritsky

Pritzkow

et al. 2002

J. Chem. Soc., Dalton Trans.

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The novel polydentate ligand N, -4H-pyrazole-3-carbonyl)-1,2-diaminoethane (L) was prepared in one-pot synthesis, employing Claisen condensation of 2-acetylpyridine and diethyl ethylene-1,2-bis(oxamate) followed by treatment with hydrazine hydrate. L possesses four bidentate chelating units and is expected to be able to bind metal ions in bis(binucleating) or tetradentate modes. Reaction of L with 1 equiv. of copper() or nickel() hydroxides in the presence of 2 equiv. KOH in DMSO affords mononuclear anionic complexes K 2) containing metal ions in square-planar environment of two pairs of deprotonated amide and pyrazolato nitrogens. Reaction of 1 with 2 equiv. of Cu(NO 3 ) 2 leads to complete rearrangement of the coordination sphere, yielding a tetranuclear product which was crystallised in the presence of picric acid in the form) was obtained as a result of spontaneous self-assembly from L and copper() nitrate in aqueous acetic acid. Reaction of 2 with 2 equiv. of Ni(NO 3 ) 2 yields a tetranuclear cationic complex 4) which contains four octahederal Ni ions coordinated in bis(binucleating) mode to two ligand threads disposed in side-by-side fashion and cis with respect to the Ni(1)-Ni(2) axis. In both 3a and 3b the ligand is coordinated in the same bis(binucleating) mode as in Ni complex 4, however, the Cu ions are squarepyramidal and the two ligand threads are disposed trans with respect to the Cu(1)-Cu(2) axis, thus giving rise to the double helical structures. 3a and 3b are the first examples of helicates comprising of bimetallic units. Formation of different topologies in 3a,b and 4 is elucidated in terms of different stereochemical preferences of these ions in mixed N,O-donor environments. All compounds were characterised by elemental analysis, ESI and MALDI mass spectrometry and UV-VIS spectroscopy, and complexes 3a, 3b and 4 by single crystal X-ray analysis. Magnetic susceptibility measurements (1.7-300 K) of powdered samples of tetranuclear complexes revealed strong (3b) or moderate (4) antiferromagnetic coupling within the dimeric units incorporating double pyrazolato bridges between paramagnetic centres. ExperimentalAll chemicals were commercial products of reagent grade and used without further purification. 1 H NMR spectra were recorded on Bruker AC-400 (400.13 MHz) and Bruker AC-500 DALTON

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“…It is well established that two-coordinate gold(I) complexes with linear coordination self associate through short AuÁ Á ÁAu contacts [44][45][46][47][48][49][50][51][52] and complexes with AgÁ Á ÁAg interactions are also known. [53][54][55][56][57][58][59] These interactions between closed-shell d 10 metal centres play an important role in determining the solid-state structures and, especially with gold(I), they have attracted considerable experimental and theoretical attention. 60 The heterotrinuclear complexes 1 and 2 combine a d 8 metal centre and two d 10 metal centres.…”

Section: Resultsmentioning

confidence: 99%

Coordination of a monomeric diphosphido platinum complex as a bridging ligand

et al. 2006

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Extension of a π-stacked N2S ligand to form bi- and tri-nuclear silver(i) complexes

Cited by 27 publications

References 10 publications

Poly[[diaquacobalt(II)]-μ-4,4′-bipyridine-κ²N:N′-μ-p-phenylenebis(oxyacetato)-κ²O:O′]

Poly[[diaquacobalt(II)]-μ-4,4′-bipyridine-κ²N:N′-μ-p-phenylenebis(oxyacetato)-κ²O:O′]

Control of molecular topology by stereochemical preferences of metal ions: double helical versus side-by-side structures in tetranuclear copper(ii) and nickel(ii) complexes

Coordination of a monomeric diphosphido platinum complex as a bridging ligand

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Extension of a π-stacked N2S ligand to form bi- and tri-nuclear silver(i) complexes

Cited by 27 publications

References 10 publications

Poly[[diaquacobalt(II)]-μ-4,4′-bipyridine-κ2N:N′-μ-p-phenylenebis(oxyacetato)-κ2O:O′]

Poly[[diaquacobalt(II)]-μ-4,4′-bipyridine-κ2N:N′-μ-p-phenylenebis(oxyacetato)-κ2O:O′]

Control of molecular topology by stereochemical preferences of metal ions: double helical versus side-by-side structures in tetranuclear copper(ii) and nickel(ii) complexes

Coordination of a monomeric diphosphido platinum complex as a bridging ligand

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Poly[[diaquacobalt(II)]-μ-4,4′-bipyridine-κ²N:N′-μ-p-phenylenebis(oxyacetato)-κ²O:O′]

Poly[[diaquacobalt(II)]-μ-4,4′-bipyridine-κ²N:N′-μ-p-phenylenebis(oxyacetato)-κ²O:O′]