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New Zwitterionic Spirocyclic λ 5 Si ‐Silicates with Two Ethane‐1,2‐diolato(2–), Oxalato(2–), or Benzene‐1,2‐diolato(2–) Ligands – Synthesis, Structure, and Dynamic Behavior
Author(s) -
Tacke Reinhold,
Pülm Melanie,
Richter Ingo,
Wagner Brigitte,
Willeke Reiner
Publication year - 1999
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/(sici)1521-3749(199912)625:12<2169::aid-zaac2169>3.0.co;2-2
Subject(s) - chemistry , tetracoordinate , ab initio , stereochemistry , solid state , crystallography , medicinal chemistry , organic chemistry , computer graphics (images) , computer science , planar
The syntheses of the zwitterionic spirocyclic λ 5 Si ‐silicates 6–9 are described. These chiral zwitterions contain a pentacoordinate (formally negatively charged) silicon atom and a tetracoordinate (formally positively charged) nitrogen atom. Compounds 6 · 1 / 2 HO(CH 2 ) 2 OH, 7 , 8 · CH 3 CN, and 9 were studied by solution‐state ( 1 H, 13 C, 29 Si) and solid‐state ( 29 Si CP/MAS) NMR experiments. In addition, all compounds were structurally characterized by single‐crystal X‐ray diffraction. The dynamic behavior ( Berry ‐type enantiomerization) of 7–9 in solution was studied by VT 1 H NMR experiments. These experimental studies were completed by ab initio investigations of the related anionic model species 10–12 .