| DOROSHENKO, Iaroslav, Michal BABIAK, Axel BUCHHOLZ, Helmar GORLS, Winfried PLASS and Jiří PINKAS. New molecular heptanuclear cobalt phosphonates: synthesis, structures and magnetic properties. New Journal of Chemistry. Cambridge: ROYAL SOC. CHEMISTRY, 2018, vol. 42, No 12, p. 9568-9577. ISSN 1144-0546. Available from: https://dx.doi.org/10.1039/c8nj00902c. |
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@article{1423415,
author = {Doroshenko, Iaroslav and Babiak, Michal and Buchholz, Axel and Gorls, Helmar and Plass, Winfried and Pinkas, Jiří},
article_location = {Cambridge},
article_number = {12},
doi = {http://dx.doi.org/10.1039/c8nj00902c},
keywords = {cobalt; complex; magnetic; phosphonate},
language = {eng},
issn = {1144-0546},
journal = {New Journal of Chemistry},
title = {New molecular heptanuclear cobalt phosphonates: synthesis, structures and magnetic properties},
url = {http://dx.doi.org/10.1039/c8nj00902c},
volume = {42},
year = {2018}
}
TY - JOUR
ID - 1423415
AU - Doroshenko, Iaroslav - Babiak, Michal - Buchholz, Axel - Gorls, Helmar - Plass, Winfried - Pinkas, Jiří
PY - 2018
TI - New molecular heptanuclear cobalt phosphonates: synthesis, structures and magnetic properties
JF - New Journal of Chemistry
VL - 42
IS - 12
SP - 9568-9577
EP - 9568-9577
PB - ROYAL SOC. CHEMISTRY
SN - 11440546
KW - cobalt
KW - complex
KW - magnetic
KW - phosphonate
UR - http://dx.doi.org/10.1039/c8nj00902c
N2 - 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.
ER -
DOROSHENKO, Iaroslav, Michal BABIAK, Axel BUCHHOLZ, Helmar GORLS, Winfried PLASS and Jiří PINKAS. New molecular heptanuclear cobalt phosphonates: synthesis, structures and magnetic properties. \textit{New Journal of Chemistry}. Cambridge: ROYAL SOC. CHEMISTRY, 2018, vol.~42, No~12, p.~9568-9577. ISSN~1144-0546. Available from: https://dx.doi.org/10.1039/c8nj00902c.
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