ISSN:
1572-8862
Keywords:
Heterometallic
;
propargyl
;
iron
;
cobalt
;
X-ray structure analysis
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract The dianionic compounds [Fe2(CO)6 E 2]2− (E=S, Se, or Te) show contrasting reactivitites toward propargyl bromide. When E=S or Se, $$\left[ {Fe_2 \left( {CO} \right)_6 \left( {\mu - ECH_2 C \equiv CH} \right)_2 } \right]$$ are isolated from the reactions of [Fe2(CO)6 E 2]2− with propargyl bromide. The S-compound, $$\left[ {Fe_2 \left( {CO} \right)_6 \left( {\mu - SCH_2 C \equiv CH} \right)_2 } \right]$$ is isolated in only one isomeric form (a, e) in which the two $$\left( {CH_2 C \equiv CH} \right)$$ moieties have different orientations, whereas the Se-compound is isolated in two isomeric forms, (a, e) and (e, e). Reaction of [Fe2(CO)6Te2]2− with propargyl bromide yields $$\left[ {Fe_2 \left( {CO} \right)_6 \left( {\mu - TeCH = C = CH_2 } \right)\left( {\mu - TeCH_2 C \equiv CH} \right)} \right]$$ , which also exists in two isomeric forms. Room temperature reactions of $$\left[ {Fe_2 \left( {CO} \right)_6 \left( {\mu - ECH_2 C \equiv CH} \right)_2 } \right]$$ with two equivalents of Co2(CO)8 yielded $$\left[ {Fe_2 \left( {CO} \right)_6 \left\{ {\left( {\mu - ECH_2 C \equiv CH} \right)Co_2 \left( {Co} \right)_6 } \right\}_2 } \right]$$ (E=S, a, e isomer; E=Se, a, e and e, e isomers. All new compounds were characterised by IR and 1H, 13C, 77Se, and l25Te NMR spectroscopy. Structures of $$\left[ {Fe_2 \left( {CO} \right)_6 \left( {\mu - SeCH_2 C \equiv CH} \right)_2 } \right]$$ (e,e), $$\left[ {Fe_2 \left( {CO} \right)_6 \left\{ {\left( {\mu - SCH_2 C \equiv CH} \right)CO_2 \left( {CO} \right)_6 } \right\}_2 } \right]$$ (a,e), and $$\left[ {Fe_2 \left( {CO} \right)_6 \left\{ {\left( {\mu - SeCH_2 C \equiv CH} \right)CO_2 \left( {CO} \right)_6 } \right\}_2 } \right]$$ (e,e), were further established by single crystal X-ray diffraction methods.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1022677422599
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