1093952-44-3Relevant academic research and scientific papers
Extended hypervalent E′...E-E...E′ 4c-6e (E, E′ = Se, S) interactions: Structure, stability and reactivity of 1-(8-PhE′C10H6)EE(C10H 6E′Ph-8′)-1′
Nakanishi, Waro,Hayashi, Satoko,Morinaka, Sayuri,Sasamori, Takahiro,Tokitoh, Norihiro
experimental part, p. 1881 - 1889 (2009/02/07)
The structure, stability and reactivity of E′...E- E...E′ (E2E′2) 4c-6e are examined employing naphthalene 1,8-positions in 1-(8-PhE′C10H 6)EE(C10H6E′Ph-8′)-1′ [1 (E = Se, E′ = S), 2 (E = S, E′ = Se), 3 (E = E′ = Se) and 4 (E = E′ = S)], together with 1-C10H7EEC 10H7-1′ [5 (E = Se) and 6 (E = S)]. Linear alignments of four Se2S2 atoms in 1 and 2 are confirmed by the X-ray analysis. 1 was not reduced by sodium borohydride, whereas 2 was, contrary to the expectation. Similarly, E-E in 3, 5 and 6 were cleaved, whereas that in 4 was not, when allowed to react with NaBH4 in aqueous THF. The reactivity of the E-E bonds in E2E′2 in 1-4 is not controlled by the central E atoms but by the outside E′ atoms. Quantum chemical (QC) calculations are performed on 1-(8-MeE′C10H 6)EE(C10H6E′Me-8′)-1′ (13-16: models of 1-4, respectively), 5 and 6, together with the related species. Conformers having E2E′2 4c-6e (abbreviated by BA) are the global minima for 13, 15 and 16, which reproduces the observed structures: BA must be stabilized by the formation of E2E′ 2 4c-6e. 14 (AB) with double n(S)...σ*(Se-C) 3c-4e interactions is the global minimum, which shows that σ*(Se-C) plays a crucial role to stabilize the 3c-4e in AB. The novel reactivity of E-E is considered based on the QC calculations. The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2008.
