Methylthioirontricarbonyl dimer

Methylthioirontricarbonyl dimer
Names
Other names
Methanethiolatoirontricarbonyl dimer
Identifiers
3D model (JSmol)
ECHA InfoCard 100.035.396 Edit this at Wikidata
EC Number
  • 238-952-6
  • InChI=1S/6CO.2CH4S.2Fe/c8*1-2;;/h;;;;;;2*2H,1H3;;/p-2
    Key: SPTHAIYODQFJDT-UHFFFAOYSA-L
  • O=C=[Fe](=C=O)(=C=O)12S(C)[Fe]1(=C=O)(=C=O)(=C=O)S2C
Properties
C8H6Fe2O6S2
Molar mass 373.94 g/mol
Appearance red crystals
Melting point 65 °C (149 °F; 338 K) (isomer A), 102 °C (isomer B)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Methylthioirontricarbonyl dimer, also known as methanethiolatoirontricarbonyl dimer, is an organometallic compound with the formula Fe2(SCH3)2(CO)6. It is a red volatile solid that is classified as a transition metal thiolate complex. It exists as air-stable red crystals with two isomers, where the methyl groups are either anti (isomer A) or syn (isomer B) with respect to each other.[1]

Synthesis

It was first synthesized 1940[2] with the discovery of isomers in 1962.[3] Synthesis involves treating triiron dodecacarbonyl with dimethyl disulfide:

2 Fe3(CO)12 + 3 (CH3)2S2 → 3 [Fe(CO)3SCH3]2 + 6 CO

It can be purified by recrystallization or by sublimation. The isomers can be separated by chromatography.

Structure

The methylthioirontricarbonyl dimer is a butterfly cluster compound, consisting of two iron atoms with distorted square pyramidal coordination geometry. The geometry is octahedral if the Fe-Fe bond is included. Each iron has three terminal carbon monoxide ligands and two bridging methylthiolate ligands. The Fe-Fe distance is 2.537 Å with an average Fe-S bond length of 2.259 Å. The average Fe-S-Fe bond angle is relatively small at 68.33°. Three isomers are possible but only the diequatorial and axial-equatorial isomers are seen. The diaxial isomer is disfavored due to steric hindrance.[4][5] The structurally related compound [Fe(CO)3S]2 has idealized C2v symmetry.

References

  1. ^ King, R. B. "Organometallic Synthesis, Volume 1: Transition-metal compounds" (1965) Academic Press. ISBN 0124080502
  2. ^ Hieber, W., Scharfenberg, C. "Einwirkung organischer Schwefelverbindungn auf die Carbonyle des Eisens" Chem. Ber. 1949, vol. 73, 1012. doi:10.1002/cber.19400730914
  3. ^ R. B. King (1962). "Organosulfur Derivatives of Metal Carbonyls. I. The Isolation of Two Isomeric Products in the Reaction of Triiron Dodecacarbonyl with Dimethyl Disulfide". J. Am. Chem. Soc. 84 (12): 2460. doi:10.1021/ja00871a045.
  4. ^ Dahl, L. F.; Wei, C. H. (1963). "Structure and Nature of Bonding of [C2H5SFe(CO)3]2". Inorg. Chem. 2 (2): 328. doi:10.1021/ic50006a022.
  5. ^ M. C. Ortega-Alfaro; N. Hernández; I. Cerna; J. G. López-Cortés; E. Gómez; R. A. Toscano; C. Alvarez-Toledano (2004). "Novel dinuclear iron(0) complexes from α,β-unsaturated ketones β-positioned with sulfide and sulfoxide groups". J. Organomet. Chem. 689 (5): 885–893. doi:10.1016/j.jorganchem.2003.12.015.

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