Tricarbonyl Species Research Articles

Synthesis and reactions of xanthate and thioxanthate carbonyl complexes of molybdenum and tungsten

A series of complexes CpM(CO) n S 2CX (M = Mo, W; n = 2, 3; X = OR, SR; R = Me, Et) has been prepared by the reaction of xanthates and thioxanthates with CpM(CO) 3Cl. The dicarbonyl compounds are the exclusive products after sufficiently long reaction times and are produced at least partially through the tricarbonyl species as intermediates. The conversion of CpM(CO) 2S 2CX to CpM(CO) 2S 3CX is not a simple first-order process but is catalyzed by Cl − and/or S 2CX −. The tricarbonyl species can be alkylated at the uncoordinated sulfur atom to give ionic di- or tri-thiocarbonate complexes.

Infrared spectroscopic evidence for tricarbonyl(triphenylphosphine)-platinum and -palladium

Summary IR spectral evidence has been obtained for the reversible formation of Pt(CO) 3 -PPh 3 and Pd(CO) 3 PPh 3 from the reactions of Pt 3 (CO) 3 (PPh 3 ) 4 [or Pt(CO) 2 (PPh 3 ) 2 ] and Pd 3 (CO) 3 (PPh 3 ) 3 respectively with carbon monoxide under pressure. The mononuclear tricarbonyl species decompose in the absence of an adequate carbon monoxide pressure. No evidence has been obtained for the further replacement of triphenylphosphine by carbon monoxide with the formation of Pt(CO) 4 or Pd(CO) 4 .

The structure of iodo-π-indenyltricarbonylmolybdenum(II)

An X-ray determination of the structure of the compound originally formulated as the sixteen electron species π-C 9H 7Mo(CO) 2I has shown that this formulation is incorrect. The complex is, in fact, the tricarbonyl species π-C 9H 7Mo(CO) 3I, and is structurally very similar to related compounds of the type π-C 5H 5Mo(CO) 3 X. The Mo(CO) 3I moiety is a square based pyramid, the base of which is on the opposite side of the molybdenum atom to the planar indenyl group. The plane of the indenyl ligand is approximately parallel to the plane defined by the three carbonyl atoms.