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Synthesis and Structures of [(Trimethylsilyl)methyl]sodium and ‐potassium with Bi‐ and Tridentate N‐Donor Ligands
Author(s) -
Clegg William,
Conway Ben,
Kennedy Alan R.,
Klett Jan,
Mulvey Robert E.,
Russo Luca
Publication year - 2011
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/ejic.201000983
Subject(s) - chemistry , trimethylsilyl , potassium , methyllithium , denticity , salt metathesis reaction , alkali metal , medicinal chemistry , crystal structure , lithium (medication) , sodium , dimethoxyethane , metathesis , stereochemistry , tetrahydrofuran , organic chemistry , solvent , polymer , polymerization , medicine , electrode , electrolyte , endocrinology
[(Trimethylsilyl)methyl]sodium [NaCH 2 SiMe 3 ] ( 1 ) was prepared by a metathesis reaction of [(trimethylsilyl)methyl]lithium [LiCH 2 SiMe 3 ] with sodium tert ‐butoxide in n ‐hexane. Polydentate donors such as N , N , N′ , N′ ‐tetramethylethylenediamine (TMEDA) and N , N , N′ , N″ , N″ ‐pentamethyldiethylenetriamine (PMDETA) form n ‐hexane‐soluble complexes of 1 and the potassium congener [KCH 2 SiMe 3 ] ( 2 ). The crystal structures of the polymers [(TMEDA)NaCH 2 SiMe 3 ] ( 1a ) and [(PMDETA)KCH 2 SiMe 3 ] ( 2a ) were determined as infinite helical chains exhibiting 3 1 or 3 2 screw‐axis symmetry. Compound 2b was obtained as the donor‐deficient heterocubane pseudotetramer [(TMEDA) 3 (KCH 2 SiMe 3 ) 4 ], with intermolecular interactions of the TMEDA‐uncoordinated potassium atom with a peripheral methyl group of a neighbouring tetramer to form infinite chains. The relatively easy accessibility and stability should make these (trimethylsilyl)methyl compounds of sodium and potassium valuable starting points for further exploration of the chemistry of these common‐utility heavier alkali metals.