New molecular heptanuclear cobalt phosphonates: synthesis, structures and magnetic properties
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F18%3A00103256" target="_blank" >RIV/00216224:14310/18:00103256 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1039/c8nj00902c" target="_blank" >http://dx.doi.org/10.1039/c8nj00902c</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1039/c8nj00902c" target="_blank" >10.1039/c8nj00902c</a>
Alternative languages
Result language
angličtina
Original language name
New molecular heptanuclear cobalt phosphonates: synthesis, structures and magnetic properties
Original language description
The synthesis, structures and magnetic properties of two novel heptanuclear homoleptic molecular cobalt phosphonates are described. Reactions between CoCl26H(2)O and (2-{[(E)-(2-hydroxyphenyl)methylidene]amino}propan-2-yl)phosphonate ligand (HSAA(2-)) in methanol lead to the crystalline products [Co-7(SAA)(2)(HSAA)(4)] (1) and [Co-7(SAA)(2)(NaSAA)(4)] (2), which crystallize in the space groups P2(1)/n (1) and P1 (2). Complexes show a similar structure motif - a centered trigonal antiprism composed of seven Co2+ ions with different coordination environments for the central and peripheral atoms. These heptanuclear molecular cages {Co-7} are held together by six phosphonate ligands. The main difference in their molecular cores is the presence of four sodium cations in 2 instead of four phenolic protons in 1. Magnetic measurements reveal a strong magnetic anisotropy for both structures 1 and 2. Above 50 K, both complexes follow the Curie-Weiss law. The low temperature susceptibility data indicate differences in the intramolecular exchange coupling, as ferromagnetic and antiferromagnetic interactions are observed for 1 and 2, respectively. This can be related to structural differences leading to variations in the Co-O-Co bridging angles between the central octahedral and the six peripheral trigonal-bipyramidal Co2+ ions.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10402 - Inorganic and nuclear chemistry
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
New Journal of Chemistry
ISSN
1144-0546
e-ISSN
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Volume of the periodical
42
Issue of the periodical within the volume
12
Country of publishing house
GB - UNITED KINGDOM
Number of pages
10
Pages from-to
9568-9577
UT code for WoS article
000435298100025
EID of the result in the Scopus database
2-s2.0-85048401043