NMR spectroscopy of amino acid complexes of antimony( iii ) and indium( iii ) fluorides
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Russian Chemical Bulletin, International Edition, Vol. 69, No. 9, pp. 1614—1624, September, 2020
NMR spectroscopy of amino acid complexes of antimony(III) and indium(III) fluorides V. Ya. Kavun, M. M. Polyantsev, L. A. Zemnukhova, and A. A. Udovenko Institute of Chemistry, Far Eastern Branch of the Russian Academy of Sciences, 159 pr. 100-letiya Vladivostoka, 690022 Vladivostok, Russian Federation. Fax + 7 (423) 231 1889. E-mail: [email protected] The results of previously published NMR studies of amino acid complexes of antimony (III) and indium(III) fluorides are critically analyzed. Correlations between the NMR data, ion mobility, and structure of the complexes in question are considered. The interpretation of the low-temperature 19F NMR spectra of amino acid complexes of antimony(III) fluorides is corrected and certain figures were changed for better informativity. Mechanisms of the onset of ion mobility in the studied complexes of Sb(III) and In(III) fluorides are proposed and the possibility of application of these compounds in the design of functional materials is assessed. Key words: antimony(III) fluoride, indium(III) fluoride, amino acid, NMR spectra.
Introduction Fundamental problems in present-day coordination chemistry include search for new compounds suitable for fabrication of functional materials based on them. Interest of researchers working in the field of design of advanced molecular materials is due to certain properties exhibited by amino acids (AA) in the formation of coordination compounds with metals. Amino acids can exist in three forms, viz., as neutral zwitterionic molecules, protonated cations, and deprotonated anions. Comprehensive information on AA molecules as structural units of complexes with metal halides, which act as mono-, bi-, or tridentate ligands, can be found in a monograph.1 The authors of that book emphasized a great variety of the crystal structures of the compounds in question and generalized the results of studies on the structure of molecular adducts with divalent metal halides. Recently, amino acid complexes of aluminum fluoride2 and indium fluoride3 have been reported for the first time. Information on the physicochemical properties of antimony( III ) fl uoride complexes with AA is scarce4—7 in contrast to the data on homoligand complexes of antimony(III) fluorides with alkali metal, thallium(I), and ammonium cations. At present, there are a few publications on the synthesis, properties, and structure of antimony(III) fluoride and indium(III) fluoride complexes with organic cations and neutral molecules8,9 and only one communication devoted to an indium(III) complex with AA.3 * Based on the materials of the XXI Mendeleev Congress on General and Applied Chemistry (September 9—13, 2019, St. Petersburg, Russia).
Antimony(III) fluoride is a good ion acceptor which forms numerous complexes.10 Structural variety of complex compounds of antimony(III) fluorides underlies the onset of piezoelectric,11 unusual electro-optical,12,13 luminescence properties,14 etc.15,16 Besides, certain compou
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