Methylthioirontricarbonyl dimer

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Methylthioirontricarbonyl dimer
Fe2 SMe 2 CO 6.svg
EXEBOY.png
Names
Other names
Methanethiolatoirontricarbonyl dimer
Identifiers
ECHA InfoCard 100.035.396
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).
Infobox references

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[edit]

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 using pentane in an alumina column.

Structure[edit]

The methylthioirontricarbonyl dimer consists 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[edit]

  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. ^ King, R. B. "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. 1962, vol. 84, 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: 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: 885–893. doi:10.1016/j.jorganchem.2003.12.015.