Reactions of [Et4N]3[Sb{Fe(CO)4}4] with Alkyl Halides and Dihalides: Formation of the Alkyl- And the Dialkylantimony-Iron Carbonyl Complexes

Minghuey Shieh, Chii Maw Sheu, Li Fang Ho, Jiann Jang Cherng, Li Fing Jang, Chuen Her Ueng, Shie Ming Peng, Gene Hsiang Lee

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17 Citations (Scopus)

Abstract

The reactions of [Et4N]3[Sb{Fe(CO)4}4] (1) with RX (R = Me, Et, n-Pr; X = I) in MeCN form the monoalkylated antimony complexes [Et4N]2[RSb{Fe(CO)4}3] (R = Me, 2; R = Et, 4; R = n-Pr, 6) and the dialkylated antimony clusters [Et4N][R2Sb{Fe(CO)4}2] (R = Me, 3; R = Et, 5; R = n-Pr, 7), respectively. When [Et4N]3[Sb{Fe-(CO)4}4] reacts with i-PrI, only the monoalkylated antimony complex [Et4N]2[i-PrSb{Fe(CO)4}3] (8) is obtained. The mixed dialkylantimony complex [Et4N][MeEtSb{Fe(CO)4}2] (9) also can be synthesized from the reaction of 2 with EtI. While the reaction with Br(CH2)2Br produces [Et4N]2[BrSb{Fe(CO)4}3] (10), treatment with Cl-(CH2)3Br forms the monoalkylated product [Et4N]2[Cl(CH2)3Sb{Fe(CO) 4}3] (11) and a dialkylated novel antimony-iron complex [Et4N][{μ-(CH2)3}Sb{Fe(CO)4} 3] (12). On the other hand, the reaction with Br(CH2)4Br forms the monoalkylated antimony product and the dialkylated antimony complex [Et4N][{μ-(CH2)4}Sb{Fe(CO)4} 2] (13). Complexes 2-13 are characterized by spectroscopic methods or/and X-ray analyses. On the basis of these analyses, the core of the monoalkyl clusters consists of a central antimony atom tetrahedrally bonded to one alkyl group and three Fe(CO)4 fragments and the dialkyl products are structurally similar to the monoalkyl clusters, with the central antimony bonded to two alkyl groups and two Fe(CO)4 moieties in each case. The dialkyl complex 3 crystallizes in the monoclinic space group P21/c with a = 13.014(8) Å, b = 11.527(8) Å, c = 17.085(5) Å, β = 105.04(3)°, V = 2475(2) Å3, and Z = 4. Crystals of 12 are orthorhombic, of space group Pbca, with a = 14.791(4) Å, b = 15.555(4) Å, c = 27.118(8) Å, V= 6239(3) Å3, and Z = 8. The anion of cluster 12 exhibits a central antimony atom bonded to three Fe(CO)4 fragments with a -(CH2)3- group bridging between the Sb atom and one Fe(CO)4 fragment. This paper discusses the details of the reactions of [Et4N]3[Sb{Fe(CO)4}4] with a series of alkyl halides and dihalides. These reactions basically proceed via a novel double-alkylation pathway, and this facile methodology can as well provide a convenient route to a series of alkylated antimony-iron carbonyl clusters.

Original languageEnglish
Pages (from-to)5504-5508
Number of pages5
JournalInorganic Chemistry
Volume35
Issue number19
DOIs
Publication statusPublished - 1996

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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