Publikace detail

Coordination capabilities of bis-(2-pyridyl)amides in the field of divalent germanium, tin and lead compounds

Rok: 2021

Druh publikace: článek v odborném periodiku

Název zdroje: Dalton Transactions

Název nakladatele: Royal Society of Chemistry

Místo vydání: Cambridge

Strana od-do: 6321-6332

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze	Koordinační schopnosti bis-(2-pyridyl)amides	Byla studována reaktivita dvou Li amidů odvozených od bis-(2-pyridyl)aminu a jeho methyl-substituovaného bis-(6-methyl-2-pyridyl)aminu.	fyzikální vlastnosti; alkyly kovů; amidy; komplexy; cín(ii)
eng	Coordination capabilities of bis-(2-pyridyl)amides in the field of divalent germanium, tin and lead compounds	The reactivity of two lithium amides derived from bis-(2-pyridyl)amine (dpa)H or its methyl-substituted congener bis-(6-methyl-2-pyridyl)amine (Me-dpa)H, i.e. (dpa)Li (1) and (Me-dpa)Li (2), toward ECl2 (where E = Ge (dioxane complex) and Sn) is reported. This study produced both heteroleptic complexes (dpa)GeCl (3), [(dpa)SnCl](2) (4), and (Me-dpa)GeCl (5) and homoleptic complexes (dpa)(2)E (E = Ge (6) or Sn (7)) and (Me-dpa)(2)E (E = Ge (8) or Sn (9)). The structures of all complexes were established by single-crystal X-ray diffraction analysis showing significant differences depending on the E atom and ligand used. By contrast, in solution, the majority of compounds showed a fluxional behaviour as demonstrated by the NMR study. Finally, it turned out that the Me-dpa ligand, unlike dpa, is able to form ate complexes [(Me-dpa)(3)E]Li (E = Ge (10), Sn (11) or Pb (12)), whose structures were determined by single-crystal X-ray diffraction analysis. This study revealed the formation of two isomers for Ge and Sn complexes depending on the coordination preference of the lithium atom being coordinated either by nitrogen donors (10-12) or solely by the Ge or Sn electron lone pair (10a and 11a). Furthermore, the NMR experiments proved that the germanium complex 10 exhibits only limited stability in solution and decomposes to germylene 8 and lithium amide 2.	physical-properties; metal alkyls; amides; complexes; tin(ii)

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