Low-temperature crystal structures of two Haldane-gap nickel chains, NENP and NENF

Landee, Christopher P.; Reza, K. A.; Bond, Marcus R.; Willett, Roger D.

doi:10.1103/physrevb.56.147

Cited by 12 publications

(8 citation statements)

References 49 publications

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“…An alternate explanation for the disorder observed in 1 is that any given chain is in fact ordered with the pyridine ligands all oriented in a single direction within a chain, but where the direction of that orientation in any given chain within the crystal is random. This type of disorder has been observed previously (e.g., the structure of [Ni(en) 2 (NO 2 )]ClO 4 ; en=ethylenediamine) 14. However, the latter can be safely ruled out in 1 , because it would lead to a magnetic response not compatible with the measured data (see below).…”

Section: Resultssupporting

confidence: 74%

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S=1/2 One‐Dimensional Random‐Exchange Ferromagnetic Zigzag Ladder, Which Exhibits Competing Interactions in a Critical Regime

Herringer

Deumal

Ribas‐Ariño

et al. 2014

Chemistry A European J

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The synthesis, crystal structure, and magnetic properties (from a combined experimental and First-Principles Bottom-Up theoretical study) of the new compound catena-dichloro(2-Cl-3Mpy)copper(II), 1, [2-Cl-3Mpy=2-chloro-3-methylpyridine] are described and rationalized. Crystals of 1 present well isolated magnetic 1D chains (no 3D order was experimentally observed down to 1.8 K) and magnetic frustration stemming from competing ferromagnetic nearest-neighbor (J(NN)) interactions and antiferromagnetic next-nearest neighbor (J(NNN)) interactions, in which α=J(NNN)/J(NN) <-0.25. These magnetic interactions give rise to a unique magnetic topology: a two-leg zigzag ladder composed of edge-sharing up-down triangles with antiferromagnetic interactions along the rails and ferromagnetic interactions along the zigzag chain that connects the rails. Crystals of 1 also present a random distribution of the 2-Cl-3Mpy groups, which are arranged in two different orientations, each with a 50 % occupancy. This translates into a random static structural disorder within each chain by virtue of which the value of the J(NN) magnetic interactions can randomly take one of the following three values: 53, 36, and 16 cm(-1). The structural disorder does not affect the J(NNN) value, which in all cases is approximately -9 cm(-1). A proper statistical treatment of this disorder provides a computed magnetic susceptibility curve that reproduces the main features of the experimental data.

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Section: Resultssupporting

confidence: 74%

“…This type of disorder has been observed previously (e.g., the structure of [Ni(en) 2 (NO 2 )]ClO 4 ; en= ethylenediamine). [14] However, the latter can be safely ruled out in 1, because it would lead to a magnetic response not compatible with the measured data (see below).…”

Section: Resultsmentioning

confidence: 96%

S=1/2 One‐Dimensional Random‐Exchange Ferromagnetic Zigzag Ladder, Which Exhibits Competing Interactions in a Critical Regime

Herringer

Deumal

Ribas‐Ariño

et al. 2014

Chemistry A European J

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“…For instance, it is possible to control the dimensionality of a magnetic solid through chemical modifications to the structure; (C n H 2 n +1 NH 3 ) 2 MCl 4 , where M is a 3d metal ion, is an example . Many compounds with a propensity for chemical tunability of magnetic properties, including KMnO 4 PO 4 ·H 2 O, Ca 2+ x Y 2 - x Cu 5 O 10 , Ni(C 2 H 8 N 2 ) 2 NO 2 ClO 4 (NENP), and Ni(C 2 H 8 N 2 ) 2 NO 2 PF 6 (NENF), have been investigated. Recent studies on Mn 12 −acetate and related systems , reveal important quantum effects and add to the importance of lattice engineering in molecular magnets.…”

Section: Introductionmentioning

confidence: 99%

Vibrational Properties of the One-Dimensional, S = ¹/₂, Heisenberg Antiferromagnet Copper Pyrazine Dinitrate

et al. 2001

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We report the temperature-dependent infrared spectra of pure, deuterated, Zn-doped, and 2,6-dimethyl-substituted samples of the S ) 1 / 2 , one-dimensional Quantum Heisenberg Antiferromagnet (QHAF) copper pyrazine dinitrate (Cu(C 4 H 4 N 2 )(NO 3 ) 2 ). Of the more than 100 vibrational modes observed in the spectra, nearly one-third of them unexpectedly soften throughout the temperature range of investigation (300-5 K). We discuss the temperature dependence of the vibrational spectra in terms of several different models for mode softening. On the basis of detailed structural information and a comparison of the infrared spectra between pure copper pyrazine dinitrate and its chemically modified relatives, we conclude that the unusual softening observed in this low-dimensional molecular magnet is due to enhanced interchain hydrogen bonding with decreasing temperature.

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“…This study was supported by ACS-PRF Grant 34779-AC5. The assistance of Dr James R. Jeitler in the preparation of the compound is appreciated [Ni(en) 2 ClO 4 ](PF 6 ) (en is ethylenediamine) (Landee et al, 1997). These compounds contain chains of nitrito-bridged nickel(II).…”

Section: Data Collectionmentioning

confidence: 99%

Tris(propane-1,3-diamine)nickel(II) bis(tetrafluoroborate)

Willett

Awwadi

2002

Acta Cryst E

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Low-temperature crystal structures of two Haldane-gap nickel chains, NENP and NENF

Cited by 12 publications

References 49 publications

S=1/2 One‐Dimensional Random‐Exchange Ferromagnetic Zigzag Ladder, Which Exhibits Competing Interactions in a Critical Regime

S=1/2 One‐Dimensional Random‐Exchange Ferromagnetic Zigzag Ladder, Which Exhibits Competing Interactions in a Critical Regime

Vibrational Properties of the One-Dimensional, S = ¹/₂, Heisenberg Antiferromagnet Copper Pyrazine Dinitrate

Tris(propane-1,3-diamine)nickel(II) bis(tetrafluoroborate)

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Low-temperature crystal structures of two Haldane-gap nickel chains, NENP and NENF

Cited by 12 publications

References 49 publications

S=1/2 One‐Dimensional Random‐Exchange Ferromagnetic Zigzag Ladder, Which Exhibits Competing Interactions in a Critical Regime

S=1/2 One‐Dimensional Random‐Exchange Ferromagnetic Zigzag Ladder, Which Exhibits Competing Interactions in a Critical Regime

Vibrational Properties of the One-Dimensional, S = 1/2, Heisenberg Antiferromagnet Copper Pyrazine Dinitrate

Tris(propane-1,3-diamine)nickel(II) bis(tetrafluoroborate)

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Product

Resources

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Vibrational Properties of the One-Dimensional, S = ¹/₂, Heisenberg Antiferromagnet Copper Pyrazine Dinitrate