1D Co<sup>II</sup> and Ni<sup>II</sup> Chiral Polymers That Exhibit Ferromagnetic Interactions

Novitchi, Ghénadie; Pilet, Guillaume; Luneau, Dominique

doi:10.1002/ejic.201100534

Cited by 17 publications

(7 citation statements)

References 70 publications

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“…The observed compression of the octahedron can be expressed by the ratio  = (Ni-O)ax/<(Ni-O)eq> = 0.93. Similar compression of the octahedral coordination of Ni(II) was found in [Ni(H2O)6][Zn(H2O)2(phen)2]2·2BTC·H2O (phen = 1,10-phenanthroline; BTC = 1,3,5-benzenetricarboxylate)32 with the value  = 0.95; a similar value of  = 0.94 was found involving the μ2bridging aqua ligand in {[Ni(cbab)(H2O)2]·H2O}n (cbab = 4-((4carboxybenzoyl)amino)benzoato) 27. The Ni-O(H2)-Ni angle in 1 is 93.09(7)°.…”

supporting

confidence: 72%

“…Nevertheless, the quality of the fit with D < 0 is much worse than with D > 0. Ferromagnetic interactions between Ni(II) centers are not as common as their antiferromagnetic counterparts; examples of ferromagnetically coupled Ni(II) atoms within chain-like arrangements were reported e.g., in chiral {Ni(L/D-mand)(4-MePy)3}n•n(ClO4) (Hmand = mandelic acid, 4-MePy = 4methylpyridine) 32 and in [Ni(1-tza)2]n (1-Htza = tetrazole-1-acetic acid). 39…”

Section: Resultsmentioning

confidence: 99%

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Preparation, First Structure Analysis, and Magnetism of the Long‐Known Nickel Benzoate Trihydrate – A Linear Ni···Ni···Ni Polymer and Its Parallels with the Active Site of Urease

et al. 2016

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Nickel benzoate trihydrate (1) was prepared in singlecrystalline form by the reaction of nickel carbonate with benzoic acid in boiling aqueous solution. Its crystal structure comprises positively charged [Ni(Bz)(H2O)2]n n+ chains, benzoate anions and one independent water molecule of solvation. The hexacoordinated Ni(II) centres in the chains are triply bridged by one syn-syn carboxylato and two aqua bridges. Adjacent chains are linked by O-H•••O hydrogen bonds [O•••O distances in the range 2.647(3) -2.684 (3) Å] through solvate water molecules and benzoate anions. Thermal analysis revealed that 1 is stable up to 100 °C; further heating leads to full dehydration accompanied by an additional decomposition reaction, as characterized by IR spectra of the intermediates. Geometrical features about the Ni centers are compared to similar features at the active sites of urease. The effective magnetic moment per formula unit µeff has a value of 3.17 µB at room temperature and upon cooling reaches a maximum value of 12.39 µB at T = 4.6 K, indicating ferromagnetic coupling between the nearest Ni(II) atoms [3.0671(1) Å] within the chains; at lower temperature this is counteracted by zero-field splitting.

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supporting

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Preparation, First Structure Analysis, and Magnetism of the Long‐Known Nickel Benzoate Trihydrate – A Linear Ni···Ni···Ni Polymer and Its Parallels with the Active Site of Urease

et al. 2016

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“…The Co-N distances are in the range 1.929(5) to 1.969(5) for ligand L 2 , while they vary in the range 1.949(6) to 1.978(6) for terminal azide ions. Unlike fac-1 and similar systems, [38][39][40][41] the average bond distance of the terminal azide ions is slightly longer than those found for the tridentate ligand. However, the shorter N-N distances of the azide ions 3).…”

Section: Description Of Crystal Structures and Dft Studiesmentioning

confidence: 54%

Methylene bridge regulated geometrical preferences of ligands in cobalt(iii) coordination chemistry and phenoxazinone synthase mimicking activity

Panja¹,

Shyamal

Saha

et al. 2014

Dalton Trans.

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Two new azide bound cobalt(III) complexes, [Co(L(1))(N3)3] (fac-1) and [Co(L(2))(N3)3] (mer-2), where L(1) is bis(2-pyridylmethyl)amine and L(2) is (2-pyridylmethyl)(2-pyridylethyl)amine, derived from tridentate reduced Schiff-base ligands have been reported. Interestingly, a methylene bridge regulated preferential coordination mode of ligands is noticed in their crystal structures: it is found in a facial arrangement in fac-1 and has a meridional disposition in mer-2. Both complexes show phenoxazinone synthase-like activity and the role of the structural factor on the catalytic activity is also explored. Moreover, the easily reducible cobalt(III) center in mer-2 favors the oxidation of o-aminophenol. The ESI-MS positive spectra together with UV-vis spectroscopy clearly suggest the formation of a catalyst-substrate adduct by substitution of the coordinated azide ions in the catalytic cycle.

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“…It is noted that the carboxylate group adopts an anti-syn coordination mode to link the Ni(II) ions, which could mediate a weak ferromagnetic exchange coupling between metal ions. 14 Thus, the dominant antiferromagnetic interaction in 2 could be attributed to the O-P-O pathway. Assuming that the exchange couplings over the O-P-O bridges are the same, the magnetic susceptibility data for 2 can be analyzed by a dimer model for spin S = 1 based on the Hamiltonian…”

Section: Dalton Transactions Papermentioning

confidence: 99%

Racemic metal phosphonates based on 2-phenyl-2-(phosphonomethylamino)acetate

et al. 2013

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The first examples of metal phosphonates based on 2-phenyl-2-(phosphonomethylamino)acetic acid (ppaH3) are reported, namely, Co3(ppa)2(4,4′-bpy)2(H2O)4·2H2O (1) and Ni4(ppaH)4(4,4′-bpy)2(H2O)2 (2). Compound 1 shows a three-dimensional framework structure in which the Co3(ppa)2 chains are cross-linked by 4,4′-bpy ligands. Within the chain, the equivalent Co2 atoms are doubly bridged by the O–P–O units from the R- and S-ppa(3−) ligands forming a racemic dimer of Co2(ppa)2. The dimers are connected by the Co1 atoms through O–P–O units to form an infinite racemic chain. Compound 2 displays a layer structure, where chains of Ni2(ppaH)2 are fused together by 4,4′-bpy. Within the chain, dimers of equivalent Ni atoms with O–P–O linkages are again observed. Unlike compound 1, however, the opposite handedness dimers are linked via O–C–O bridges into an infinite racemic chain. Magnetic studies reveal that dominant antiferromagnetic interactions are mediated between the magnetic centers in both cases.

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1D Co^II and Ni^II Chiral Polymers That Exhibit Ferromagnetic Interactions

Cited by 17 publications

References 70 publications

Preparation, First Structure Analysis, and Magnetism of the Long‐Known Nickel Benzoate Trihydrate – A Linear Ni···Ni···Ni Polymer and Its Parallels with the Active Site of Urease

Preparation, First Structure Analysis, and Magnetism of the Long‐Known Nickel Benzoate Trihydrate – A Linear Ni···Ni···Ni Polymer and Its Parallels with the Active Site of Urease

Methylene bridge regulated geometrical preferences of ligands in cobalt(iii) coordination chemistry and phenoxazinone synthase mimicking activity

Racemic metal phosphonates based on 2-phenyl-2-(phosphonomethylamino)acetate

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1D CoII and NiII Chiral Polymers That Exhibit Ferromagnetic Interactions

Cited by 17 publications

References 70 publications

Preparation, First Structure Analysis, and Magnetism of the Long‐Known Nickel Benzoate Trihydrate – A Linear Ni···Ni···Ni Polymer and Its Parallels with the Active Site of Urease

Preparation, First Structure Analysis, and Magnetism of the Long‐Known Nickel Benzoate Trihydrate – A Linear Ni···Ni···Ni Polymer and Its Parallels with the Active Site of Urease

Methylene bridge regulated geometrical preferences of ligands in cobalt(iii) coordination chemistry and phenoxazinone synthase mimicking activity

Racemic metal phosphonates based on 2-phenyl-2-(phosphonomethylamino)acetate

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Product

Resources

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1D Co^II and Ni^II Chiral Polymers That Exhibit Ferromagnetic Interactions