Bis(triphenylphosphine)iron tricarbonyl

Tricarbonylbis(triphenylphosphine)iron(0) is a coordination complex with the formula Fe(CO)3(PPh3)2 (Ph = C6H5). A yellow solid, this complex is derived from iron pentacarbonyl by replacement of two carbonyl ligands by triphenylphosphine (PPh3).

Bis(triphenylphosphine)iron tricarbonyl
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/2C18H15P.3CO.Fe/c2*1-4-10-16(11-5-1)19(17-12-6-2-7-13-17)18-14-8-3-9-15-18;3*1-2;/h2*1-15H;;;;
    Key: NPCXYZUUVGQEGS-UHFFFAOYSA-N
  • [C-]#[O+].[C-]#[O+].[C-]#[O+].C1=CC=C(C=C1)P(C2=CC=CC=C2)C3=CC=CC=C3.C1=CC=C(C=C1)P(C2=CC=CC=C2)C3=CC=CC=C3.[Fe]
Properties
C39H30FeO3P2
Molar mass 664.459 g·mol−1
Appearance yellow solid
Melting point 262–266 °C (504–511 °F; 535–539 K) decomp
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Strynthesis and reactions

The title complex can be prepared by reaction of triiron dodecacarbonyl with excess triphenylphosphine:[1]

Fe3(CO)12 + 6 P(C6H5)3 → 3 Fe(CO)3(P(C6H5)3)2 + 3 CO

(Triphenylphosphine)iron tetracarbonyl is an intermediate in the synthesis of this compound. The title complex can also be produced more efficiently by borohydride-catalyzed substitution of iron pentacarbonyl.[2][3]

Protonation gives the ferrous hydride:[4]

Fe(CO)3(P(C6H5)3)2 + HBF4 → [HFe(CO)3(P(C6H5)3)2]BF4

Both the mono- and bis(triphenylphosphine) complexes were originally described by Walter Reppe.[5]

References
  1. Clifford, A. F.; Mukherjee, A. K. (1966). "Iron Carbonyl Complexes of Triphenylphosphine, Triphenylarsine, and Triphenylstibine". Inorganic Syntheses. Vol. VIII. pp. 185–191. doi:10.1002/9780470132395.ch49. ISBN 9780470131671.
  2. Therien, M. J.; Trogler, W. C. (1990). Bis(phosphine) Derivatives of Iron Pentacarbonyl and Tetracarbonyl(tri-tert-butylphosphine)iron(0). pp. 173–9. doi:10.1002/9780470132593.ch45. ISBN 9780471526193. {{cite book}}: |journal= ignored (help)
  3. Keiter, Richard L.; Keiter, Ellen A.; Boecker, Carol A.; Miller, David R.; Hecker, Karl H. (1997). Tricarbonylbis(phosphine)iron(0) Complexes. Inorganic Syntheses. Vol. 31. pp. 210–214. doi:10.1002/9780470132623.ch31. ISBN 9780470132623.
  4. Sowa, John R.; Zanotti, Valerio; Facchin, Giacomo; Angelici, Robert J. (1991). "Heats of Protonation of Transition-Metal Complexes: The Effect of Phosphine Basicity on Metal Basicity in CpIr(CO)(PR3) and Fe(CO)3(PR3)2". Journal of the American Chemical Society. 113 (24): 9185–9192. doi:10.1021/ja00024a026.
  5. Reppe, Walter; Schweckendiek, Walter Joachim (1948). "Cyclisierende Polymerisation von Acetylen. III Benzol, Benzolderivate und hydroaromatische Verbindungen". Justus Liebigs Annalen der Chemie. 560: 104–116. doi:10.1002/jlac.19485600104.
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