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Properties of Acetylene Complexes

In contrast to vanadium compounds, niobium and tantalum complexes of the formula [Mcp(C2R2)(CO)2] exist in solution in monomer-dimer equilibria  [Pg.399]

Owing to its smaller atomic radius, vanadium does not form dimers. [Pg.399]

Complexes [Mcp(C2Ph2)(CO)]2 are formed as a result of decomposition of [Mcp(C2Ph2)(CO)2]. The dimeric compounds possess a metal-metal double bond. [Pg.399]

For all acetylene compounds of these elements, substantial lowering of the carbon-carbon bond multiplicity is observed despite a small number of d electrons, as evidenced by a considerable lowering of the v(C = C) frequency. This frequency equals ca 1700cm for nonbridging alkynes and ca 1500cm for bridging acetylenes. [Pg.399]

Chromium group elements form alkyne complexes of the type [M(C2R2)(CO)5] (R = H, Me, Et). However, such compounds are unstable and are formed only during irradiation of carbonyls [M(CO)6] in the presence of alkynes. The compound [W(C2H2)2 (C0)4] is obtained in a similar fashion. These complexes were not isolated in the solid state. [Pg.399]


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