Crystal structure, magnetic properties, and orbital interactions of the [(.mu.-terephthalato)(ethylenediamine)diaquocopper(II)] zigzag chain

Bakalbassis, Evangelos G.; Bozopoulos, A. P.; Mrozinski, J.; Rentzeperis, P. J.; Tsipis, Constantinos A.

doi:10.1021/ic00276a019

Cited by 103 publications

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“…This is a typical value for terephthalatobridged nickel(II) complexes. [38,39] Crystals of 4[BPh 4 ] 2 ·4MeCN·EtOH are triclinic, space group P1. ORTEP views of the structure of the dication 4 and the central core are provided in Figure 3.…”

Section: The [Lni 2 ]mentioning

confidence: 99%

Tetranuclear Nickel(II) Complexes Composed of Pairs of Dinuclear LNi₂ Fragments Linked by Acetylenedicarboxylate, Terephthalate, and Isophthalate Dianions: Synthesis, Structures and Magnetic Properties

Klingele

Baars

et al. 2007

Eur J Inorg Chem

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The tetranuclear nickel(II) complexes [(LNiII2)2(acetylenedicarboxylate)][BPh4]2 (2[BPh4]2), [(LNiII2)2(terephthalate)][BPh4]2 (3[BPh4]2), and [(LNiII2)2(isophthalate)][BPh4]2(4[BPh4]2), where L2– represents a macrocyclic hexaaza‐dithiophenolate ligand, have been synthesized and characterised by UV/Vis spectroscopy, IR spectroscopy, X‐ray crystallography, and magnetic susceptibility measurements. Each dicarboxylate dianion acts as a quadridentate bridging ligand linking two bioctahedral LNi2 units via μ1,3‐bridging carboxylate functions to generate discrete [(LNiII2)2(dicarboxylate)]2+ dications with a central LNi2(O2C–R–CO2)Ni2L core. The structures differ mainly in the distance between the center of the Ni···Ni axes of the isostructural LNi2 units (8.841(1) Å in 2[BPh4]2, 10.712(1) in 3[BPh4]2, and 9.561(1) in 4[BPh4]2) and the tilting angle between the two Ni2O2 planes (86.3° in 2[BPh4]2, 58.2° in 3[BPh4]2, 20.9° in 4[BPh4]2). Magnetic susceptibility measurements on the complexes over the range 2.0–295 K reveal the presence of weak ferromagnetic exchange interactions between the NiII ions within the dinuclear subunits with values for the magnetic exchange constant J1 of 23.1(5), 18.1(5), and 14.2(5) cm–1 for 2[BPh4]2, 3[BPh4]2, and 4[BPh4]2, respectively (H = –2JS1S2). The magnitude of the exchange interaction J2 across the dicarboxylate bridges is in all cases less than 0.1 cm–1, suggesting that no significant interdimer exchange coupling occurs in 2[BPh4]2–4[BPh4]2. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)

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Section: The [Lni 2 ]mentioning

confidence: 99%

Tetranuclear Nickel(II) Complexes Composed of Pairs of Dinuclear LNi₂ Fragments Linked by Acetylenedicarboxylate, Terephthalate, and Isophthalate Dianions: Synthesis, Structures and Magnetic Properties

Klingele

Baars

et al. 2007

Eur J Inorg Chem

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“…[25] Figure 7. Fitting of χ M T vs. T data using the dimeric model of S ϭ 1 / 2 local spins; solid line shows the best fit obtained…”

Section: ϫ5mentioning

confidence: 99%

Use of Different Unsaturated Dicarboxylates Toward the Design of New 3D and 2D Networks of Copper(II)

et al. 2004

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Two new polymeric complexes of copper(II), [Cu(L1), have been synthesized. The molecular structures are determined by X-ray crystallography. Complex 1 is a fumarato-bridged zig-zag 1D chain of Cu II −L1, which is extended to a 3D coordination polymer through bridging water molecules. Complex 2 is a chain of Cu II in which the terephthalate anions bridge in alternate bis(bidentate) and bis-(monodentate) fashions. The coexistence of such types of

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“…The coligand is also slightly bent (C≡C 1.185(6) Ǻ) such that the intramolecular distances between two nickel atoms of different dinuclear subunits within the tetranuclear complex range from 8.623(1) to 9.769(1) Å. The only system comparable to that of 6 is provided by the complex [{Mo 2 (DAniF) 3 } 2 (O 2 CC≡CCO 2 )], where DAniF = N,N'-di-p-anisylformamidinate, for which an intramolecular Mo···Mo distance of 9.537 Å has been reported [39]. There are no signifi cant intermolecular interactions between the Ni II 4 complexes within the lattice.…”

Section: Scheme 2 Complexes Prepared and Their Labelsmentioning

confidence: 99%

Dinuclear Complexes as Building Blocks for Tetra-Nuclear Macrocyclic Complexes with Dithiolate Macrocyclic Ligand

Lozan¹

2013

ChemJMold

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A series of novel tri-, tetra-and pentanuclear complexes composed of dinuclear LM 2 units (M=Co, Ni, Zn; L=24-membered macrocyclic hexaaza-dithiophenolate ligand) and ferrocene-carboxylate ([CpFeC 5 H 4 CO 2 ]ˉ), 1,1'-ferro-cenedicarboxylate ([Fe(C 5 Keywords: coordination chemistry, amino-thiophenolate ligands, di-and tetranuclear complexes, ferrocene and naphthalene diimide derivatives, polynuclear complexes IntroductionThe chemistry of container molecules has developed extensively over the past two decades. Many container molecules such as calixarenes, resorcarenes, cyclodextrins, carcerands and glycourils have been invaluable in studying the fundamental principles of inclusion phenomena and consequently their use in separation science or drug delivery, as two examples of application. Importantly, the area has attracted interest in the field of supramolecular chemistry because the properties of such host-guest compounds are often different from those of their constituent components. By adjusting the size and form of the binding cavity it is often possible to complex co-ligands in unusual coordination modes, to activate and transform small molecules, or to stabilize reactive intermediates [1,2]. One subclass are the metallated container molecules, in which metal ions and clusters are used as both a point of recognition and to give the container a well-defined structure. Such compounds also allow for an interplay of molecular recognition and transition-metal catalysis, and for the construction of more effective enzyme mimics. Of interest to the present work is the ability of metallocavitands to recognize and encapsulate difunctionalised molecules towards stabilising or enhancing the optical and electronic properties of redox-and photo-active compounds within a confined environment set up by two hemispheres.The carboxylate group, RCO 2-, can bind to transition metals in a variety of coordination modes giving rise to complexes of great structural diversity [3]. Current activities focus on the coordination chemistry of polycarboxylate ligands, as these offer great potential in the construction of polynuclear aggregates [4] and extended coordination polymers with micro-and mesoporous structures [5][6][7][8] or catalytic properties [9]. In addition, polycarboxylate ligands are of importance as spin-coupling bridging ligands [10][11][12][13][14][15][16][17] in the rapidly expanding fi eld of molecular magnetism [18, 19]. In this context, an enormous amount of literature has been generated concerning the distance dependence of magnetic exchange interactions between metal atoms linked by extended dicarboxylate ligands. Dinuclear copper complexes bridged by oxalate [20, 21] and terephthalate [22][23][24] dianions form, by far, the largest group of such systems, and it appears that the exchange interactions depend on the M···M distance [25], the relative orientation of the magnetic orbitals [26], and the degree of conjugation of the organic spacer unit [27, 28].

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Crystal structure, magnetic properties, and orbital interactions of the [(.mu.-terephthalato)(ethylenediamine)diaquocopper(II)] zigzag chain

Cited by 103 publications

References 0 publications

Tetranuclear Nickel(II) Complexes Composed of Pairs of Dinuclear LNi₂ Fragments Linked by Acetylenedicarboxylate, Terephthalate, and Isophthalate Dianions: Synthesis, Structures and Magnetic Properties

Tetranuclear Nickel(II) Complexes Composed of Pairs of Dinuclear LNi₂ Fragments Linked by Acetylenedicarboxylate, Terephthalate, and Isophthalate Dianions: Synthesis, Structures and Magnetic Properties

Use of Different Unsaturated Dicarboxylates Toward the Design of New 3D and 2D Networks of Copper(II)

Dinuclear Complexes as Building Blocks for Tetra-Nuclear Macrocyclic Complexes with Dithiolate Macrocyclic Ligand

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Crystal structure, magnetic properties, and orbital interactions of the [(.mu.-terephthalato)(ethylenediamine)diaquocopper(II)] zigzag chain

Cited by 103 publications

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Tetranuclear Nickel(II) Complexes Composed of Pairs of Dinuclear LNi2 Fragments Linked by Acetylenedicarboxylate, Terephthalate, and Isophthalate Dianions: Synthesis, Structures and Magnetic Properties

Tetranuclear Nickel(II) Complexes Composed of Pairs of Dinuclear LNi2 Fragments Linked by Acetylenedicarboxylate, Terephthalate, and Isophthalate Dianions: Synthesis, Structures and Magnetic Properties

Use of Different Unsaturated Dicarboxylates Toward the Design of New 3D and 2D Networks of Copper(II)

Dinuclear Complexes as Building Blocks for Tetra-Nuclear Macrocyclic Complexes with Dithiolate Macrocyclic Ligand

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Tetranuclear Nickel(II) Complexes Composed of Pairs of Dinuclear LNi₂ Fragments Linked by Acetylenedicarboxylate, Terephthalate, and Isophthalate Dianions: Synthesis, Structures and Magnetic Properties

Tetranuclear Nickel(II) Complexes Composed of Pairs of Dinuclear LNi₂ Fragments Linked by Acetylenedicarboxylate, Terephthalate, and Isophthalate Dianions: Synthesis, Structures and Magnetic Properties