Synthesis and Structure of Cyclic Zwitterionic Silicates. Formation via Si−N Donor Interaction1

Autor:	Ramil-Marcelo L. Mercado, A. Chandrasekaran, Robert R. Holmes, Roberta O. Day
Rok vydání:	1999
Předmět:	Silanes Bicyclic molecule Stereochemistry Chemistry Ligand Organic Chemistry Silane Nmr data Inorganic Chemistry Crystallography Trigonal bipyramidal molecular geometry chemistry.chemical_compound Physical and Theoretical Chemistry Pyramid (geometry)
Zdroj:	Organometallics. 18:1686-1692
ISSN:	1520-6041 0276-7333
DOI:	10.1021/om9808413
Popis:	New silanes, [C6H4(CH2)NMe2](C6H4O2)SiPh (1) and [C6H4(CH2)NMe2]2Si(OCH2CH3)2 (2), and new bicyclic zwitterionic silicates, [C6H4(CH2)NMe2H](C6H4O2)2Si (3), [C6H4(CH2)NMe2H](C6H3O2F)2Si (4), [C6H4(CH2)NMe2H](C10H6O2)2Si·C6H5CH3 (5), and [C6H4(CH2)NMe2H][C6H3O2(OMe)]2Si (6), all containing the N,N-dimethylbenzylamine ligand, are reported. X-ray structures of 1 and 3−5 were obtained as well as 1H and 29Si NMR data. As a consequence of strong Si−N coordination, the geometry of silane 1 is characterized more as a trigonal bipyramid (TBP), whereas the zwitterionic silicates 3−5 are displaced toward a rectangular pyramid (RP). The synthesis of zwitterionic 3 is achieved either by way of 1, which exhibits Si−N coordination, or by way of 2 in reactions with catechols. Zwitterionic 4−6 also are formed from 2 using the appropriate catechols. It is likely that an intermediate analogous to pentacoordinate silane 1 involving Si−N coordination assists in promoting the reactions leading to 3−6. In comparison with the 1H...
Databáze:	OpenAIRE
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