Ruthenium(III) acetylacetonate is a coordination complex with the formula Ru(O2C5H7)3. O2C5H7− is the ligand called acetylacetonate. This compound exists as a dark red solid that is soluble in most organic solvents.[3] It is used as a precursor to other compounds of ruthenium.

Preparation

In 1914 tris(acetylacetonato)ruthenium(III) was first prepared by the reaction of ruthenium(III) chloride and acetylacetone in the presence of potassium bicarbonate.[4] Since then, alternative synthetic routes have been examined, but the original procedure remains useful with minor variations:[5]

RuCl3•3H2O + MeCOCH2COMe → Ru(acac)3 + 3 HCl + 3 H2O

Structure and properties

This compound has idealized D3 symmetry. Six oxygen atoms surround the central ruthenium atom in an octahedral arrangement. The average Ru-O bond length in Ru(acac)3 is 2.00 Å.[1] Because Ru(acac)3 is low spin, there is one unpaired d electron, causing this compound to be paramagnetic. Ru(acac)3 has a magnetic susceptibility, χM, of 3.032×10−6 cm3/mol with an effective magnetic moment, μeff, of 1.66 μB.[6] As a solution in dimethylformamide, the compound oxidizes at 0.593 and reduces at -1.223 V vs the ferrocene/ferrocenium couple.[7]

Reduction of Ru(acac)3 in the presence of alkenes affords the related diolefin complexes. Typically, such reactions are conducted with zinc amalgam in moist tetrahydrofuran:[8]

2 Ru(acac)3 + 4 alkene + Zn → 2 Ru(acac)2(alkene)2 + Zn(acac)2

The resulting compounds are rare examples of metal-alkene complexes that reversibly sustain oxidation:

Ru(acac)2(alkene)2 ⇌ [Ru(acac)2(alkene)2]+ + e−

The complex has been resolved into individual enantiomers by separation of its adduct with dibenzoyltartaric acid.[9]

References

  1. ^ a b Chao, G.; Sime, R. L.; Sime, R. J. (1973). "Crystal and molecular structure of tris(acetylacetonato)ruthenium(III)". Acta Crystallographica B. 29 (12): 2845. doi:10.1107/S0567740873007636.
  2. ^ "C&L Inventory". echa.europa.eu.
  3. ^ R. C. Mehrotra, R. Bohra, and D.P. Gaur "Metal β-Diketonates and Allied Derivatives", 1st ed.; Academic Press inc.: New York, 1978. ISBN 0-12-488150-5.
  4. ^ Barbieri, G. A. (1914). "Systematic chemical investigations: ruthenium, rhodium, palladium". Atti Accad, Lincei. 23 (1): 334–40.
  5. ^ Gupta, A. (2000). "Improved synthesis and reactivity of tris(acetylacetonato)ruthenium(III)". Indian Journal of Chemistry, Section A. 39A (4): 457. ISSN 0376-4710.
  6. ^ Grobelny, R. (1966). "The absorption spectra and magnetic properties of the chelated compounds of Ru(III) with β-diketones". Journal of Inorganic and Nuclear Chemistry. 28 (11): 2715–2718. doi:10.1016/0022-1902(66)80398-6.
  7. ^ Paul Sharpe; N. George Alameddin; David E. Richardson (1994). "Alkyl Substituent Effects in the Redox Thermochemistry of Coordination Compounds: Oxidation and Reduction Energetics for Ruthenium Tris(β-diketonate) Complexes in Solution and the Gas Phase". Journal of the American Chemical Society. 116 (24): 11098–11108. doi:10.1021/ja00103a027.
  8. ^ Bennett, M. A.; Byrnes, Matthew J.; Kováčik, Ivan (2004). "The fragment bis(acetylacetonato)ruthenium: a meeting-point of coordination and organometallic chemistry". Journal of Organometallic Chemistry. 689 (24): 4463. doi:10.1016/j.jorganchem.2004.07.027.
  9. ^ Drake, A. F.; Gould, J. M.; Mason, S. F.; Rosini, C.; Woodley, F. J. (1983). "The optical resolution of tris(pentane-2,4-dionato)metal(III) complexes". Polyhedron. 2 (6): 537–538. doi:10.1016/S0277-5387(00)87108-9.
Allikas: https://en.wikipedia.org/wiki/Ruthenium(III)_acetylacetonate
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