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Crystal Structure and Magnetic Properties of the S=1/2 Quantum Spin System Cu-7(TeO3)(6)F-2 with Mixed Dimensionality
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).ORCID-id: 0000-0002-0323-0210
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
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2014 (Engelska)Ingår i: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 53, nr 14, s. 7661-7667Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The new oxofluoride Cu-7(TeO3)(6)F-2 has been synthesized by hydrothermal synthesis. It crystallizes in the triclinic system, space group P (1) over bar. The crystal structure constitutes a Cu-O framework with channels extending along [001] where the F- ions and the stereochernically active lone-pairs on Te4+ are located. From magnetic susceptibility, specific heat, and Raman scattering measurements we find evidence that the magnetic degrees of freedom of the Cu-O-Cu segments in Cu-7(TeO3)(6)F-2 lead to a mixed dimensionality with single Cu S = 1/2 moments wealdy coupled to spin-chain fragments. Due to the weaker coupling of the single moments, strong fluctuations exist at elevated temperatures, and long-range magnetic ordering evolves at comparably low temperatures (T-N = 15 K).

Ort, förlag, år, upplaga, sidor
2014. Vol. 53, nr 14, s. 7661-7667
Nationell ämneskategori
Kemi
Forskningsämne
oorganisk kemi
Identifikatorer
URN: urn:nbn:se:su:diva-106923DOI: 10.1021/ic5009686ISI: 000339472000066OAI: oai:DiVA.org:su-106923DiVA, id: diva2:741917
Anmärkning

AuthorCount:7;

Tillgänglig från: 2014-08-29 Skapad: 2014-08-27 Senast uppdaterad: 2017-12-05Bibliografiskt granskad
Ingår i avhandling
1. Transition metal oxofluorides comprising lone pair elements: Synthesis and Characterization
Öppna denna publikation i ny flik eller fönster >>Transition metal oxofluorides comprising lone pair elements: Synthesis and Characterization
2014 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Within the family of transition metal oxochlorides/bromides containing lone pair elements, the transition metal cations often adopt a low-dimensional arrangement such as 2D layers, 1D chains or 0D clusters. The reduced dimensionality is attributed to the presence of stereochemically active lone pairs which are positioned in the non-bonding orbital and will not participate in bond formation and instead act as structural spacers that help to separate coordination polyhedra around transition metal cations from forming three dimensional networks. On the other hand, the chlorine and bromine ions also play an important role to open up the crystal structure because of their low coordination number. However, fluorine has been rarely used in this concept due to the difficulties in synthesis.

This thesis is focused on finding new compounds in the M-L-O-F system (M = transition metal cation, L= p-block lone pair elements such as Te4+, Se4+, or Sb3+) in order to study the structural character of fluorine. Hydrothermal reactions have been adopted instead of conventional chemical transport reactions that are commonly used for synthesizing compounds in the M-L-O-(Cl, Br) family. A total of 8 new transition metal oxofluorides containing lone pair elements have been synthesized and their structures have been determined via single crystal X-ray diffraction. Bond valence sum calculations are used to distinguish in between fluorine and oxygen due to their very similar X-ray scattering factors.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Materials and Environmental Chemistry (MMK), Stockholm University, 2014. s. 70
Nyckelord
lone pairs, oxofluorides, low-dimensional compounds
Nationell ämneskategori
Oorganisk kemi
Forskningsämne
oorganisk kemi
Identifikatorer
urn:nbn:se:su:diva-103051 (URN)978-91-7447-890-7 (ISBN)
Disputation
2014-06-16, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 13:00 (Engelska)
Opponent
Handledare
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At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 4: Manuscript. Paper 5: Manuscript.

Tillgänglig från: 2014-05-22 Skapad: 2014-04-29 Senast uppdaterad: 2014-08-29Bibliografiskt granskad

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Hu, ShichaoMace, AmberJohnsson, Mats
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Institutionen för material- och miljökemi (MMK)
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Inorganic Chemistry
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