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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 and 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, vol.~42, No~3, p.~1931-1938. ISSN~1144-0546. Available from: https://dx.doi.org/10.1039/c7nj03606j.
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