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Titolo:
STRUCTURAL CHARACTERIZATION OF 2 MODIFICATIONS OF TETRAHYDROFURAN)(TRIS(TRIMETHYLSILYL)SILYL)LITHIUM - A COMPOUND WITH A SI-29-LI-7 NMR COUPLING
Autore:
HEINE A; HERBSTIRMER R; SHELDRICK GM; STALKE D;
Indirizzi:
UNIV GOTTINGEN,INST ANORGAN CHEM,TAMMANNSTR 4 W-3400 GOTTINGEN GERMANY UNIV GOTTINGEN,INST ANORGAN CHEM,TAMMANNSTR 4 W-3400 GOTTINGEN GERMANY
Titolo Testata:
Inorganic chemistry
fascicolo: 12, volume: 32, anno: 1993,
pagine: 2694 - 2698
SICI:
0020-1669(1993)32:12<2694:SCO2MO>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
METAL SILYL COMPLEXES; RAY CRYSTAL-STRUCTURE; C-LI BOND; TRIS(TRIMETHYLSILYL)SILYL DERIVATIVES; ELECTRONIC-STRUCTURE; LITHIUM; METHYLLITHIUM; ABINITIO;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
34
Recensione:
Indirizzi per estratti:
Citazione:
A. Heine et al., "STRUCTURAL CHARACTERIZATION OF 2 MODIFICATIONS OF TETRAHYDROFURAN)(TRIS(TRIMETHYLSILYL)SILYL)LITHIUM - A COMPOUND WITH A SI-29-LI-7 NMR COUPLING", Inorganic chemistry, 32(12), 1993, pp. 2694-2698

Abstract

The crystal structures of (Me3Si)4Si.THF (a = b = 12.310(1) angstrom,c = 17.308(2) angstrom, tetragonal, space group P4/ncc (No. 130), Z =4), [(Me3Si)4Si] [(Me3Si)3SiLi(THF)3]2 (a = b = 15.146(8) angstrom, c= 21.338(10) angstrom, trigonal, space group P3clBAR (No. 165), Z = 2), (Me3Si)3SiLi(THF)3 (a = b = 31.342(4) angstrom, c = 22.000(6) angstrom, rhombohedral, space group R3c (No. 161), Z = 24), and (Me3Si)3SiSi(SiMe3)3.THF (a = 11.360(3) angstrom, b = 17.131(6) angstrom, c = 18.952(6) angstrom, beta = 91.21(3)-degrees, monoclinic, space group P2(1)/c (No. 14), Z = 4), have been determined by low-temperature X-ray analysis. Whereas the small Si-Si-Si angle in (tris(trimethylsilyl)silyl)lithium of 102.1-degrees supports the ionic character of the Si-Li bond, there must be at least some covalent contribution leading to a (1J[Si,Li])-Si-29-Li-7 coupling constant of 38.6 Hz. A modified preparation for (Me3Si)3SiLi(THF)3 is reported giving the pure product rather than the cocrystallization product [(Me3Si)4Si] [(Me3Si)3SiLi(THF)3]2, Where the starting material is still present in the ratio 1:2. The pure product is far more reactive than the cocrystallized material and isas pyrophoric as (t)BuLi powder.

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Documento generato il 02/12/20 alle ore 14:34:23