A SQUARE AS-4 AND A PRISMATIC AS-6 STRUCTURE AS COMPLEX LIGANDS

Citation
C. Vonhanisch et al., A SQUARE AS-4 AND A PRISMATIC AS-6 STRUCTURE AS COMPLEX LIGANDS, Chemistry, 3(9), 1997, pp. 1494-1498
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry
Journal title
Chemistry → ACNP
ISSN journal
0947-6539
Volume
3
Issue
9
Year of publication
1997
Pages
1494 - 1498
Database
ISI
SICI code
0947-6539(1997)3:9<1494:ASAAAP>2.0.ZU;2-O
Abstract
[As-7(SiMe3)(3)] reacts with [(CpCoCl)(2)] to give black crystals of the ionic compound [(CpCo)(3)As-6][CoCl4] (1). The cation [(Cp*Co)(3) As-6](2+) consists of an As-6 prism, with squares capped by [CpCo] fr agments, When [((CpCoCl)-Co-tBu)(2)] is used instead of [(CpCoCl)(2)] in the reaction, dark red crystals of [((CpCo)-Co-tBu)(3)As-6][CoCl3( thf)](2) (2) and green-black crystals of [((CpCo)-Co-tBu)(2)As-4[Co3Cl 8(thf)(2)] (3) can be obtained. The cation in 2 shows a structure very similar to that of 1. The [((CpCo)-Co-tBu)(2)As-4](2+) cations in 3 c an be described as a triple-decker sandwich complex with two [(CpCo)-C o-tBu](+) fragments bridged by an As-4 ligand. Density functional calc ulations reproduce the experimental data of 1 and 3 and allow an inter pretation of molecular electronic structure and bonding in these and r elated compounds with As replaced by P and Co by Fe.