Abstract
Abstract The interaction of activated La powder with [CpMo(CO) 3 ] 2 or Hg[CpMo(CO) 3 ] 2 in THF resulted in the formation of crystalline (THF) 5 La[CpMo(CO) 3 ] 3 · THF (I), which oxidized readily on exposure to air with cleavage of [CpMo(CO) 3 ) 2 . Complex I was characterized by X-ray structural analysis. The La atom is bound to three equivalent CpMo(CO) 3 fragments via almost linear carbonyl bridges, MoCOLa (MoCO 177.9(7)°). The coordination of La with the terminal CO group (LaO av 2.444(5) A) leads to elongation of the CO bond from an average value of 1.16(1) to 1.21(1) A, and to shortening of the MoC bond from an average value of 1.943(9) to 1.874(9) A, compared with the unbridged CO. The coordination of La is complemented to CN = 8 at the expense of binding of five THF molecules (LaO(THF) av = 2.580(6) A; the sixth THF molecule is crystallizable).
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