Quaterpyridine Ligands Forming Helical Complexes of Mono‐ and Dinuclear (Helicate) Forms

Stefankiewicz, Artur R.; Walesa, M.; Jankowski, Piotr; Ciesielski, Artur; Patroniak, Violetta; Kubicki, Maciej; Hnatejko, Zbigniew; Harrowfield, Jack M.; Lehn, Jean‐Marie

doi:10.1002/ejic.200800172

Cited by 40 publications

(31 citation statements)

References 56 publications

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“…In the present case, multidentate ligand L was obtained as a side product of a Stille coupling reaction [40], as outlined in Scheme 1. Furthermore, we also found another side product 4; unfortunately the main reaction product 3 was not found, which is not surprising for such a kind of reaction [26]. …”

Section: Resultsmentioning

confidence: 72%

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Cobalt(II) complex with new terpyridine ligand: An ab initio geometry optimization investigation

Ciesielski

Gorczyński

Jankowski

et al. 2010

Journal of Molecular Structure

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Section: Resultsmentioning

confidence: 72%

“…The reaction mixture was stirred and heated at reflux for 24 h, and then the toluene was evaporated under reduced pressure. The residue was purified by column chromatography on alumina (dichloromethane/hexane, 4:6) and 5% methanol in dichloromethane to afford (0.167 g, 34%) of compound 4 [26] and (90 mg, 22%) of ligand L. …”

Section: Preparation Of Lmentioning

confidence: 99%

Cobalt(II) complex with new terpyridine ligand: An ab initio geometry optimization investigation

Ciesielski

Gorczyński

Jankowski

et al. 2010

Journal of Molecular Structure

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“…Up to date, many fascinating supramolecular structures have been obtained by using metal ions and ligands containing nitrogen-donor atoms, for instance bipyridine [1], terpyridine [2] or tetrapyridine [3], to name a few.…”

Section: Resultsmentioning

confidence: 99%

“…The ligand L and the complex were prepared as described previously [3]. Solvents were freshly distilled under argon from CaH 2 .…”

Section: Preparationmentioning

confidence: 99%

Unprecedented Architecture of the Linear (μ-Cl)-Tetranuclear Cobalt Complex with Quaterpyridine Ligand

2011

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The cationic tetranuclear cobalt complex of the geometry Cl-CoL-Cl-CoL-Cl-CoL-Cl-CoL (where L is 6,6 000 -dimethyl-2,2 0 :6 0 ,2 00 :6 00 ,2 000 -quaterpyridine) has been synthesized and structurally characterized. The structural unit contains one cationic ligand, two Eu(NO 3 ) 5 dianions, two solvent acetonitrile molecules and some disordered water molecules. The salt crystallizes in the monoclinic space group C2/c with a = 17.405 (3) Å , b = 28.700 (5) Å and c = 23.350 (5) Å , b = 95.14 (2)8. The cation is C 2 -symmetrical, the central Cl atom lies on the twofold axis. This structure is another example of centro-noncentro ambiguity: in the centrosymmetric model, the terminal Cl in the cation is disordered between the two ends of the chain. The Eu ion is coordinated by five nitro groups, the coordination number is 10-two oxygen atoms of every nitro group are involved in the coordination with the mean Eu-O distance of 2.52(3) Å . The quaterpyridine ligands are folded, the dihedral angle between the terminal ring planes is 29.3 (2) and 32.8 (3)8 in the two symmetry independent ligands. In the crystal structure the coulombic attraction between the cations and anions seems to be a driving force; the ionic species make a chessboard-like pattern, the voids in such created structure are filled with the solvent-acetonitrile molecules as well as by some disordered waters.Keywords Co complexes Á Eu complexes Á Centro-noncentro ambiguity Á Crystal packing Results and DiscussionThe use of transition metal ions capable of bridging multidentate ligands to construct pre-programed, self-assembled small inorganic systems and multi-dimensional infinite supramolecular networks is an area of chemistry which has received ever-increasing attention over recent years. Up to date, many fascinating supramolecular structures have been obtained by using metal ions and ligands containing nitrogen-donor atoms, for instance bipyridine [1], terpyridine [2] or tetrapyridine [3], to name a few.In the present work, we extend these studies of the metalo-ligand complexes based on tetrapyridine ligand coordinated with d-and f-metal ions, obtained in one-pot reaction. The crystals contain cation with four organic ligands coordinated to the four cobalt ion bridged by chloride ions and two penta-nitrato anionic species with nitrate oxygen atoms coordinated to trivalent europium ion. The formation of this type of complex may be understood considering the large stability of polynitrato counter ions [4]. The high affinity of the europium ions for nitrato anions does not allow heterometallic Co-Eu complexes to be prepared from N 4 -donor ligand if the latter anions are present in solution [5].The investigated complex may be of use in several fields of coordination chemistry. In particular, d-and f-polynuclear complexes might be used to fabricate nanomagnetic materials of the potential use in many fields, [6] and due to their electronic properties such as high conductivity as molecular devices in the field of nano-electronics [7,8]. Figures 1 and ...

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“…This was collected by filtration and was shown by 1 H NMR spectroscopy and electrospray mass spectrometry to be compound 2. This ligand has previously been reported [14][15][16], and has been shown to form both mononuclear complexes [M(2)(OH 2 ) 2 ] 2+ , [M(2)Cl(OH 2 )] + (M= Co, Zn) [14] and related cations [15], and [2+2] double helicates [M 2 (2) 2 ] 2+ (M= Cu, Ag) [14]. This set of complexes demonstrates how 2 can bind as a tetradentate or bis(bidentate) ligand to one or two metal centres, respectively.…”

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confidence: 94%

Capturing copper(II) ions using {Cu(tpy)(bpy)} domains

Constable

Housecroft

Price

et al. 2010

Inorganic Chemistry Communications

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Quaterpyridine Ligands Forming Helical Complexes of Mono‐ and Dinuclear (Helicate) Forms

Cited by 40 publications

References 56 publications

Cobalt(II) complex with new terpyridine ligand: An ab initio geometry optimization investigation

Cobalt(II) complex with new terpyridine ligand: An ab initio geometry optimization investigation

Unprecedented Architecture of the Linear (μ-Cl)-Tetranuclear Cobalt Complex with Quaterpyridine Ligand

Capturing copper(II) ions using {Cu(tpy)(bpy)} domains

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