Complexation of Ln <superscript>3+</superscript> with Pyridine-2,6-dicarboxamide: Formation of the 1:2 Complexes in Solution and Gas Phase.
In: Inorganic chemistry, Jg. 59 (2020-10-05), Heft 19, S. 14486-14492
Online
academicJournal
Zugriff:
Electrospray ionization of LnCl 3 and tetramethylpyridine-2,6-dicarboxamide (TMPDA) mixtures in methanol generated abundant tripositively charged Ln(TMPDA) 2 3+ ions with an unprecedented 1:2 stoichiometry in the gas phase. Different from the very common 1:3 Ln(L) 3 3+ (L = TMGA, tetramethyl glutaramide; TMOGA, tetramethyl-3-oxaglutaramide; TMTDA, tetramethyl-3-thiodiglycolamide) complexes, Ln 3+ is coordinated by four O carbonyl and two N pyridine atoms from two perpendicular TMPDA ligands based on the DFT calculations. The observation of 1:2 Ln(TMPDA) 2 3+ in the gas phase is due to the desolvation of Ln(TMPDA) 2 (MeOH) 2 3+ that is predominant in the methanol solution of LnCl 3 and TMPDA according to the extended X-ray absorption fine structure analysis, and the 1:3 Ln(TMOGA) 3 3+ and Ln(TMGA) 3 3+ complexes observed in the gas phase also parallel the speciation in relevant solutions. Such a difference in solution speciation is most likely a result of the unfavorable steric effect caused by the pyridine ring of TMPDA.
Titel: |
Complexation of Ln <superscript>3+</superscript> with Pyridine-2,6-dicarboxamide: Formation of the 1:2 Complexes in Solution and Gas Phase.
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Autor/in / Beteiligte Person: | Chen, X ; Xiong, Z ; Gong, Y |
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Zeitschrift: | Inorganic chemistry, Jg. 59 (2020-10-05), Heft 19, S. 14486-14492 |
Veröffentlichung: | [Easton, Pa.] American Chemical Society., 2020 |
Medientyp: | academicJournal |
ISSN: | 1520-510X (electronic) |
DOI: | 10.1021/acs.inorgchem.0c02285 |
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