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Syntheses, Stereochemistry, and Dynamic Behavior of Chiral Zwitterionic (Ammoniomethyl)bis[glycolato(2–)‐ O 1 , O 2 ]silicates
Author(s) -
Tacke Reinhold,
Bertermann Rüdiger,
Biller Andreas,
Dannappel Olaf,
Pülm Melanie,
Willeke Reiner
Publication year - 1999
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(199905)1999:5<795::aid-ejic795>3.0.co;2-a
Subject(s) - tetracoordinate , chemistry , zwitterion , nuclear magnetic resonance spectroscopy , nitrogen atom , spectroscopy , stereochemistry , crystallography , ab initio , chirality (physics) , ab initio quantum chemistry methods , silicon , protonation , computational chemistry , organic chemistry , molecule , ion , ring (chemistry) , physics , computer graphics (images) , quantum mechanics , computer science , planar , nambu–jona lasinio model , chiral symmetry breaking , quark
The syntheses of the zwitterionic (molecular) spirocyclic λ 5 Si ‐silicates 5 – 9 are described. These chiral compounds contain a pentacoordinate (formally negatively charged) silicon atom and a tetracoordinate (formally positively charged) nitrogen atom. The stereochemistry and dynamic behavior of 5 – 9 were investigated. For this purpose, compounds 5 – 9 were studied by solution‐state NMR spectroscopy ( 1 H, 13 C, 29 Si; including VT 1 H‐NMR studies of 9 ) and solid‐state NMR spectroscopy ( 13 C CP/MAS, 29 Si CP/MAS). In addition, compounds 5 ·H 2 O, 7 , 8 , 9 ·H 2 O, and 9 ·2CH 3 CN were structurally characterized by single‐crystal X‐ray diffraction, and ab initio investigations of the zwitterion 8 and the related anionic model species 10 were carried out.