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@article{1408360,
author = {Doroshenko, Iaroslav and Babiak, Michal and Buchholz, Axel and Tuček, Jiří and Plass, Winfried and Pinkas, Jiří},
article_location = {Cambridge},
article_number = {3},
doi = {http://dx.doi.org/10.1039/c7nj03606j},
keywords = {iron; phosphonate; hexanuclear; Moessbauer spectroscopy;antiferromagnetic coupling},
language = {eng},
issn = {1144-0546},
journal = {New Journal of Chemistry},
title = {Hexanuclear iron(III) alpha-aminophosphonate: synthesis, structure, and magnetic properties of a molecular wheel},
url = {http://dx.doi.org/10.1039/c7nj03606j},
volume = {42},
year = {2018}
}
TY - JOUR
ID - 1408360
AU - Doroshenko, Iaroslav - Babiak, Michal - Buchholz, Axel - Tuček, Jiří - Plass, Winfried - Pinkas, Jiří
PY - 2018
TI - Hexanuclear iron(III) alpha-aminophosphonate: synthesis, structure, and magnetic properties of a molecular wheel
JF - New Journal of Chemistry
VL - 42
IS - 3
SP - 1931-1938
EP - 1931-1938
PB - ROYAL SOC. CHEMISTRY
SN - 11440546
KW - iron
KW - phosphonate
KW - hexanuclear
KW - Moessbauer spectroscopy;antiferromagnetic coupling
UR - http://dx.doi.org/10.1039/c7nj03606j
N2 - A new hexanuclear molecular iron phosphonate complex, [Fe-6(HAIPA)(12)(OH)(6)]center dot nH(2)O (1 center dot n(2)O) (H(2)AIPA = NH2(CH3)(2)CP(O)(OH)(2), (2-aminopropan-2-yl) phosphonic acid), was synthesized from Fe2+ and Fe3+ salts in water by interaction with the ligand salts. Addition of corresponding amounts of sodium or tetramethylammonium salts of H2AIPA to the solution of iron precursors led to the formation of large bright-green crystals of complex 1. Isolated products were studied by spectroscopic and analytical methods -IR, Mossbauer spectroscopy, TG/DSC, ICP-OES, and CHN analysis. A novel {Fe-6} hexanuclear molecular structure of 1 was confirmed by single crystal X-ray diffraction analysis. An octahedral coordination environment of iron cations is formed by phosphonate and hydroxo oxygens. Twelve phosphonate groups and six -OH groups act as bridging ligands and bind six Fe octahedra. Because of protonation of the amino group, the phosphonate anions coordinate in the zwitterionic form as HAIPA(-) (NH3+(CH3)(2)CPO32-). The iron cations are present in the form of high-spin Fe3+, which was confirmed by the bond valence sum (BVS) calculations and the Fe-57 Mossbauer spectra. The magnetic measurements show antiferromagnetic coupling between the iron centers with decreasing temperature.
ER -
DOROSHENKO, Iaroslav, Michal BABIAK, Axel BUCHHOLZ, Jiří TUČEK, Winfried PLASS a Jiří PINKAS. Hexanuclear iron(III) alpha-aminophosphonate: synthesis, structure, and magnetic properties of a molecular wheel. \textit{New Journal of Chemistry}. Cambridge: ROYAL SOC. CHEMISTRY, 2018, roč.~42, č.~3, s.~1931-1938. ISSN~1144-0546. Dostupné z: https://dx.doi.org/10.1039/c7nj03606j.
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