Zusammenfassung
The selective formation of the dinuclear butterfly complexes [{Cp'''Fe(CO)(2)}(2)(mu,eta(1:1)-E-4)](E= P (1a), As (1b)) and [{Cp* Cr(CO)(3)}(2)(m,h(1:1)-E4)] (E= P (2a), As (2b)) as new representatives of this rare class of compounds was found by reaction of E-4 with the corresponding dimeric carbonyl complexes. Complexes 1b and 2b are the first As4 butterfly compounds with a bridging ...
Zusammenfassung
The selective formation of the dinuclear butterfly complexes [{Cp'''Fe(CO)(2)}(2)(mu,eta(1:1)-E-4)](E= P (1a), As (1b)) and [{Cp* Cr(CO)(3)}(2)(m,h(1:1)-E4)] (E= P (2a), As (2b)) as new representatives of this rare class of compounds was found by reaction of E-4 with the corresponding dimeric carbonyl complexes. Complexes 1b and 2b are the first As4 butterfly compounds with a bridging coordination mode. Moreover, first studies regarding the reactivity of 1b and 2b are presented, revealing the formation of the unprecedented As-8 cuneane complexes [{Cp'''Fe(CO)(2)}(2){Cp'''Fe(CO)}(2)(mu(4),eta(1:1:2:2)-As8)] (3b) and [{Cp*Cr(CO)(3)}(4)(mu(4),eta(1:1):(1:1)-As-8)] (4). The compounds are fully characterized by NMR and IR spectroscopy as well as by X-ray structure analysis. In addition, DFT calculations give insight into the transformation pathway from the E-4 butterfly to the corresponding cuneane structural motif.
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