Das Anion [R2Al-AlR2Br]- (R = CH(SiMe3)2) mit Aluminium-Aluminium- und terminaler Aluminium-Brom-Bindung / The Anion [R2Al-AlR2Br]- (R = CH(SiMe3)2) with an Aluminium -Aluminium and a Terminal Aluminium -Bromine Bond

1994 ◽  
Vol 49 (5) ◽  
pp. 637-641 ◽  
Author(s):  
Werner Uhl ◽  
Uwe Schütz ◽  
Siegfried Pohl ◽  
Wolfgang Saak
Keyword(s):  
Crystal Structure ◽  
Bond Length ◽  
Structure Determination ◽  
Crystal Structure Determination ◽  
Aluminium Atom ◽  
Ethereal Solution ◽  
Quantitative Formation ◽  
Starting Compound

Tetrakis[bis(trimethylsilyl)methyl]dialane(4) (1) with an Al-Al bond reacts with LiBr in n-pentane in the presence of chelating N.N.N'.N'-tetramethylethylenediamine (TMEDA) to yield the monobromo adduct [Li(TMEDA)2]+[R2Al-AlR2Br]- 4. Compound 4 is unstable in ethereal solution and decomposes with quantitative formation of LiBr and the starting compound 1. Crystal structure determination of 4 C5H10 shows a terminal Al-Br bond in an anion with a four-coordinated aluminium atom neighbouring a three-coordinated, coordinatively unsaturated aluminium atom. While the Al-Al bond length is not significantly different (264.3 pm) as compared to the data for 1, the Al-Br bond is rather long (247.6 pm) indicating a weak coordinative bonding.

The Structure of 1,1'-Oxalylbisisatin, a Reactive α-Oxo Imide

1987 ◽  
Vol 40 (10) ◽  
pp. 1755
Author(s):  
DS Black ◽  
N Chaichit ◽  
BM Gatehouse ◽  
GI Moss
Keyword(s):  
Crystal Structure ◽  
Bond Length ◽  
Structure Determination ◽  
Bond Angle ◽  
Crystal Structure Determination ◽  
Cyclic Imide ◽  
X Ray

The X-ray crystal structure determination of the reactive α-oxo imide 1,1'-oxalylbisisatin (1) is described. Bond length and bond angle details are compared with those of seven similar cyclic imide structures (2)-(8).

scholarly journals trans Influence of Telluro- and Thio-ether Donor Sites: First Palladium(II) Complex, [PdCI2{4-MeOC6H4TeCH2CH2SEt}], showing their Relative Magnitude in the Same Molecule

1999 ◽  
Vol 23 (12) ◽  
pp. 716-717
Author(s):  
Ajai K. Singh ◽  
C. Valan Amburose ◽  
Mridulata Misra ◽  
Ray J. Butcher
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Bond Length ◽  
Structure Determination ◽  
Relative Magnitude ◽  
Single Crystal Structure ◽  
Crystal Structure Determination ◽  
Trans Influence

The synthesis of a (Te,S) ligand 4-MeOC6H4TeCH2CH2SEt (L) and its complex [PdCI2L] is followed by single crystal structure determination of the complex, which indicates that the Pd-CI bond length trans to the ArTe group [2.344(3) Å] is longer than that trans to SEt [2.316(4) Å], suggesting a stronger trans influence for the former.

Vom Fluorsilan zum Siloxan — 1,3-Silylgruppenwanderung am Si3CSiO-Gerüst/ From a Fluorosilane to a Siloxane — 1,3-Migration of Silyl Groups in the Si3CSiO System

1985 ◽  
Vol 40 (8) ◽  
pp. 1023-1028 ◽  
Author(s):  
Uwe Klingebiel ◽  
Sabine Pohlmann ◽  
Lutz Skoda ◽  
Cornelia Lensch ◽  
George M. Sheldrick
Keyword(s):  
Crystal Structure ◽  
Structure Determination ◽  
Crystal Structure Determination ◽  
Silyl Groups ◽  
Trimethylsilyl Groups

AbstractThe nature of the products which are formed in the reaction of tris(trimethylsilyl)Methylfluorosilanes (Me3Si)3C -SiF2R with KOH depends on the bulkiness of the substituents R. The condensed siloxane is obtained for R = F . The crystal structure determination of this siloxane (Me3Si)3C -SiF2-O -SiF2-C (SiMe3)3 shows that the Si -O - Si unit is linear. A fluorosilanol as well as a siloxane could be isolated for R = Me. 1,3-Migration of one or two trimethylsilyl groups from the carbon to the oxygen takes place for R = phenyl, rm-butyl or silylamine, with formation of siloxanes which are isomeres o f the expected silanols.

Sign in / Sign up

Export Citation Format

Share Document