Design and synthesis of magnetic ladders: structure and magnetic properties of Cu(2,3-dimethylpyrazine)Br2

Wells, Brian; Landee, Christopher P.; Turnbull, Mark M.; Awwadi, Firas F.; Twamley, Brendan

doi:10.1016/j.molcata.2004.09.068

Cited by 27 publications

(11 citation statements)

References 43 publications

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“…The study of magnetic ladders, such as bis(piperidinium)tetrabromocuprate(II) 14 and dibromo-2,3-dimethylpyrazinecopper, 15 has been of much interest in recent years because of the observation linking mechanisms in these systems to those that govern high temperature superconductivity. 16,17 Given the prior success in generating a magnetic ladder using 2,3dimethylpyridine and the established use of amino substituents to affect packing, there is interest in creating a family of complexes containing 2,3-disubstituted pyridines, including those with the amino group in the 3-position.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structure, and magnetic properties of bis (3-amino-2-chloropyridinium)tetrahalocuprate(II) [halide = Cl or Br]

Herringer

Turnbull

Landee

et al. 2009

Journal of Coordination Chemistry

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The reaction of CuX 2 (X= Cl or Br) with 3-amino-2-chloropyridine in aqueous acids (HX; X= Cl or Br) yields compounds bis(3-amino-2-chloropyridinium) tetrachlorocuprate (II) and bis(3amino-2-chloropyridinium) tetrabromocuprate (II). Both compounds have been characterized by IR, powder X-ray diffraction, single-crystal X-ray diffraction and temperature dependent magnetic susceptibility. The compounds are isomorphous and exhibit weak antiferromagnetic interactions.

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Section: Introductionmentioning

confidence: 99%

Synthesis, structure, and magnetic properties of bis (3-amino-2-chloropyridinium)tetrahalocuprate(II) [halide = Cl or Br]

Herringer

Turnbull

Landee

et al. 2009

Journal of Coordination Chemistry

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“…In the CuO 4 N 2 group, the Cu-O bond lengths vary from 1.9339(13) to 2.6731(8) Å, in which even the longest value [2.6731(8) Å] is much shorter than the sum of the van der Waals radii of Cu and O toms (2.90 Å), indicating weak Cu-O contacts. [17][18][19][20] The Cu(1) atom is constrained to lie on the squares plane defined by O1, O2, O4 and O5, the sum of the bond angles within the Fig. 1 The coordination geometry of the metal centre and the ligand geometry in 1.…”

Section: Resultsmentioning

confidence: 99%

“…Anal. Calcd for C18 H 16 CuN 4 O 6 : C, 48.27; N,12.51; H, 3.60; Found: C, 49.01; N, 12.25; H, 3.30%. IR (KBr cm -1 ): 3434(s), 3083(w), 3050(m), 1610(s), 1535(s), 1429(s), 1469(s), 1383(m), 1297(m), 1104(s), 1075(m), 815(s), 672(m), 643(m).…”

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confidence: 99%

Syntheses, Structures and Magnetic Properties of two New Supramolecular Complexes

Wang

et al. 2013

Journal of Chemical Research

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Two new complexes, namely [Cu(L1)(NO 3 )(bipy)] (1) and [Cu 2 (L2) 4 (H 2 O) 2 ] (2) (HL1= 2-ethoxynicotinic acid, HL2= 2-methoxynicotinic acid and bipy=4,4'-bipyridine) have been synthesised and structurally characterised by singlecrystal diffraction analysis. The structure of complex 1 is a ladder-like chain, which is connected by stronger hydroge n bond interactions to result in a 2D network. While complex 2 is composed of molecular dimmer based on a paddlewheel unit with two coppers, four syn-syn carboxylates, and two water molecules coordinated to copper in the axial positions which could also be linked into a 2D supramolecular architecture via hydrogen bond interactions. Magnetic studies reveal the overall antiferromagnetic interactions between neighbouring Cu(II) ions in compounds 1 and 2.

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“…These double chains are connected by the ligands into layers located in the ab plane. The topology of the coordination network of compound 3 is identical with that in the corresponding CuCl compound poly[di-µ 3 -chloro-µ 2 -2,3-dimethylpyrazine-N,N -dicopper(I)], but the two compounds are not isotypic [23]. However, this arrangement is frequently found in 2 : 1 CuX coordination polymers (X = Cl, Br, I).…”

Section: Crystal Structure Of Poly[di-µ 3 -Bromo-µ 2 -23-dimethylpyrmentioning

confidence: 85%

“…1: left). Four years later Wells et al reported on a second compound in this system, which was obtained by accident as a by-product in the synthesis of dibromo-2,3-dimethylpyrazine-copper(II) [23]. In the 3 : 2 compound catena[tribromo-µ 2 -bis(µ 2 -2,3-dimethylpyrazine-N,N )-tricopper(I)] (2) (CuBr) 3 sixmembered rings are connected by the 2,3-dimethylpyrazine ligands into double chains ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Crystal Structure and Properties of CuBr(2,3-dimethylpyrazine) Coordination Polymers

Jeß

Táborský

Näthera

2007

Zeitschrift Für Naturforschung B

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Reaction of CuBr with an excess of 2,3-dimethylpyrazine in acetonitrile leads to the formation of the literature known ligand-rich 1 : 1 compound poly[μ2-bromo-μ2-2,3-dimethylpyrazine- N,N′-copper(I)] (1). On heating this compound in a thermobalance a transformation into the new ligand-deficient 2 : 1 compound poly[di-μ3-bromo-μ2-2,3-dimethylpyrazine-N,N′-dicopper(I)] (3) is observed, which later was also prepared in solution. This compound crystallizes in the monoclinic space group P21/n with all atoms in general positions. In the crystal structure the Cu atoms are surrounded by three Br atoms and one 2,3-dimethylpyrazine ligand within a distorted tetrahedron. The tetrahedra are connected via common Br edges into CuBr double chains, which are connected by the ligands into layers located in the ab plane. The formation of compounds 1 and 3 was also investigated in solution. The results have shown that compound 1 can only be prepared if an excess of the ligand is used. If CuBr and the ligand are reacted in a ratio of 1 : 1, in the beginning the literature known ligand-deficient 3 : 2 intermediate catena[tribromo-μ2-bis(μ2-2,3-dimethylpyrazine- N,N′)-tricopper(I)] (2) is obtained, which transforms within minutes into compound 3. If a crystalline suspension of compound 1 is stirred in acetonitrile a transformation into the most stable compound 3 is also observed. The luminescence properties of compounds 1 and 3 were investigated. The complexes show differences mainly in the emission spectra.

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Design and synthesis of magnetic ladders: structure and magnetic properties of Cu(2,3-dimethylpyrazine)Br2

Cited by 27 publications

References 43 publications

Synthesis, structure, and magnetic properties of bis (3-amino-2-chloropyridinium)tetrahalocuprate(II) [halide = Cl or Br]

Synthesis, structure, and magnetic properties of bis (3-amino-2-chloropyridinium)tetrahalocuprate(II) [halide = Cl or Br]

Syntheses, Structures and Magnetic Properties of two New Supramolecular Complexes

Synthesis, Crystal Structure and Properties of CuBr(2,3-dimethylpyrazine) Coordination Polymers

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