MOLECULAR STRUCTURE OF ORGANOSILICON COMPOUNDS WITH Si-Fe, Si-Co AND Si-Ni BONDS

Abstract

The results of the structural investigations of the group 8 metal derivatives containing the direct Si-Fe, Si-Co, Si-Ni bonds are summarized in the present review. IntroductionRecently we have published a comprehensive survey of data on the molecular structure of organosilicon compounds with Si-Si [1], Si-Ge, Si-Sn, Si-Pb, Si-Ti, Si-Zr, and Si-Hf bonds [2], as a part of the structural investigations related to the silyl substituted metal derivatives. Herein, we present a review concerning the molecular structure of iron, cobalt and nickel derivatives bearing silyl substituents at the metal atoms. Compounds with transition metal-silicon bonds have been the focus of a considerable interest and there has been remarkable progress over the last few years in the preparation of complexes containing silyl and silylene ligands. This is largely motivated by the possibility to stabilize complexes otherwise unstable, the occurrence of unusual structures, novel reactivity patterns and the construction of clusters having direct metal-metal bonds. These complexes are characterized by a very rich chemistry and have important applications in a number of catalytic processes.

Reaction of phenyltrifluorosilane with 8‐hydroxy‐ or 8‐mercapto‐quinoline and their derivatives as a route to new heterocyclic compounds of pentacoordinate silicon

“…The N −−−→ Si and O-Si are slightly elongated (to 0.28Å and 0.13Å respectively) in comparison with those in tetracoordinated silicon compounds. 3,4 All the above compounds are highly sensitive to moisture.…”

Crystal structure of di-ter-butylbis(3-trimethylsilylethinyl)silane, (C4H9)2Si[C2Si(CH3)3]2

“…The most conspicuous features are the short Si-C bond lengths to the acetylenic carbon atoms of 184.4(2) pm and 185.2(3) pm and the considerable widened C-Si-C bond angle of 119.7(1)° within the l Bu2Si moiety [2]. …”

MOLECULAR STRUCTURE OF ORGANOSILICON COMPOUNDS WITH Si - Ru, Si - Rh and Si - Pd BONDS

“…This value lies on the low end of the range observed for other ruthenium compounds. The structure of complex 1 [Cp*, L=CO, R 3 Si = (2-MeCeH4) 2 SiOH] [5] reveals the formation of discrete dimeric units linked by one Si-OH Ο hydrogen bond. Geometric parameters of compounds 1 are presented in Table 1.…”

“…30 31 The Ru 2 Si2 core of bis^-silyl) complexes 32 [42,43] forms a folded quadrangle. Different Ru -Si bond lengths in compound 32 (R='Bu, R'=H, R"=Ph) represent the existence of two-electron three-center interactions around Ru (2 ). The agostic bond Ru (2 ) -Si ( i) (2.438 A) is longer than Ru (1) -Si(i) (2.300 A), and the distance Ru (2) -Si (2) (2.675 A) is ca.…”

“…Different Ru -Si bond lengths in compound 32 (R='Bu, R'=H, R"=Ph) represent the existence of two-electron three-center interactions around Ru (2 ). The agostic bond Ru (2 ) -Si ( i) (2.438 A) is longer than Ru (1) -Si(i) (2.300 A), and the distance Ru (2) -Si (2) (2.675 A) is ca. 0.30 A longer than that of Ru ( d -Si (2) (2.375 A).…”