Ringhalogenierte Carbonyl(η ⁵ ‐cyclopentadienyl)vanadium‐Komplexe

Abstract

Hexacarbonylvanadium reagiert mit Hexachlor-und Hexabromcyclopentadien zu den Halbsandwichkomplexen (qs-CSX5)V(CO), (X = CI, 1; X = Br, 2). Komplex 2 wurde durch Rontgenstrukturanalyse charakterisiert. Mit 1,2,3,4,5-Pentachlorcyclopentadien wird neben 1 auch (qs-CsHC14)V(CO)4 (3) gebildet. 1,2,3,4-Tetrachlor-6-phenylpntafulven und V(CO), reagieren zu (qsC5Cl&H,Ph)V(CO), (4). Die Umsetzung zwischen V(CO), und 1 ,I ,3-Trichlor-und -brominden fiihrt zu den 3,3'-Dihalogenindenyl-i-indenylidenen und geringen Mengen an

Coordination Chemistry of Pentahalocyclopentadienyls

“…The solid-state structures of the pentafluorocyclopentadienyl complex 7r4O1, the pentachlorocyclopentadienyl complexes Sa, r91 9b, [23] 1 Oa, 1491 1 I a, U31 the perbromo derivatives 1 b, [26] 8b, [371 llb[s31 and the pentaiodocyclopentadienyl derivatives 2121~~1 and 9d[33] have been reported. Quite interestingly, there is no structure report for a ferroceiie derivative.…”

“…l b behaves similarly, except that the fragmentation series {VC5Br4(CO),) is absent. [26] Two detailed mass spectrometric investigations of several chloroferrocenes have been published.…”

Monocyclopentadienyl Compounds of Vanadium

“…Photolysis of V(ti 5 The corresponding in vacuo thermolysis (reaction 8) of (II) and diphenylacetylene gave a cyclobutadiene vanadium complex ν(η 5 -C 5 H 5 )(CO) 2 (ti 4 -C 4 Ph") in 43% yield. ν 2 (η 5 -0 5 Η 5 ) 2 (€0) 5 is produced photochemically from V(TI 5 -CJH S )(CO)4 its chemistry with alkynes has been reported /7/.…”

“…4.1, resembles that of (ti5 -C S H 5 )V(CO) 4 with the V(CO) 4 moiety forming a square pyramid, and a planar indenyl group coordinating to the (R,R'=Ph,Ph;Ph,Me;Et,Et) vanadium through the five-membered ring. The distance from the vanadium to this plane is 1.935(1)Ä, and the vanadium was found to lie less than 0.1Ä off center of the η 5 ring.…”

“…There are two different routes to the THF vanadium complex by photolysis of THF solutions of V(ti 5 -C 5 Chalcogenides complexes of vanadium of general formula V(n 5 -C 5 H 5 )(CO) 3 EMe 2 (E=S,Se,Te), see Table 5, can be prepared by irradiation ofV^5-C 5 H 5 )(CO) 4 in the presence of EMe 2 (E=S,Se,Te) /23/. X-ray structural determination of ν(η 5 -ΰ 5 Η 5 )(03) 3 SMe 2 is shown in section 2.4, Figure 2 The high-field (low-frequency) isotope shift of metal shielding,on conversion of [Υ(η 5 -0 5 Η 5 )(00) 3 Ή]-to [V^5-C s H 5 )(CO) 3 2 H]·, has been studied and the isotope effect is of the order -4,7ppm.…”