Iron tris(diethyldithiocarbamate)

Iron tris(diethyldithiocarbamate) is the coordination complex of iron with diethyldithiocarbamate with the formula Fe(S2CNEt2)3 (Et = ethyl).[1] It is a black solid that is soluble in organic solvents.

Iron tris(diethyldithiocarbamate)
Names
IUPAC name
Tris(diethyldithiocarbamato)iron
Other names
Ferric diethyl dithiocarbamate
Identifiers
3D model (JSmol)
ChemSpider
EC Number
  • 237-743-7
  • InChI=1S/3C5H11NS2.Fe/c3*1-3-6(4-2)5(7)8;/h3*3-4H2,1-2H3,(H,7,8);/q;;;+3/p-3
    Key: WGPCJVLKOFIRMS-UHFFFAOYSA-K
  • CCN(CC)C(=S)[S-].CCN(CC)C(=S)[S-].CCN(CC)C(=S)[S-].[Fe+3]
Properties
[(C2H5)2NCS2]3Fe
Molar mass 500.63 g/mol
Appearance Dark brown to black solid
Density 1.404 g/cm3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Synthesis, structure, bonding

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Iron tris(dithiocarbamate)s are typically are prepared by salt metathesis reactions.[1]

Iron tris(diethyldithiocarbamate) is an octahedral coordination complex of iron(III) with idealized D3 symmetry.[2]

The phenomenon of spin crossover (SCO) was first reported in 1931 by Cambi et al. who observed anomalous magnetic behavior for the tris(N,N-dialkyldithiocarbamatoiron(III) complexes.[3] The magnetism of these complexes are sensitive to the nature of the amine substituents as well as to temperature. This behavior is consistent with an equilibrium between two or more spin states.[4] In the case of Fe(Et2dtc)3, X-ray crystallography reveals that the Fe-S bonds are 231 pm at 79K but 356 pm at 297 K. These data indicate a low-spin configuration at low temperatures and a high spin configuration near room temperature.[2]

Iron tris(dithiocarbamate)s characteristically react with nitric oxide to give Fe(dtc)2NO. This efficient chemical trapping reaction provides a means to detect NO.[5]

Reflecting the strongly donating properties of dithiocarbamate ligands, iron tris(dithiocarbamate)s oxidize at relatively mild potentials to give isolable iron(IV) derivatives [Fe(S2CNR2)3]+.[6]

Safety

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Iron tris(dimethyldithiocarbamate) is the herbicide ferbam, which is poisonous.

See also

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References

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  1. ^ a b D. Coucouvanis (2007). "The Chemistry of the Dithioacid and 1,1-Dithiolate Complexes". Progress in Inorganic Chemistry. 11: 233–371. doi:10.1002/9780470166123.ch4. ISBN 9780470166123.
  2. ^ a b Leipoldt, J. G.; Coppens, P. (1973). "Correlation between structure- and temperature-dependent magnetic behavior of iron dithiocarbamate complexes. Crystal Structure of Tris(N,N diethyldithiocarbamato)iron(III) at 297.deg. and 79.deg.K". Inorganic Chemistry. 12 (10): 2269–2274. doi:10.1021/ic50128a012.
  3. ^ L. Cambi; L and L. Szego (1931). "Über die magnetische Susceptibilität der komplexen Verbindungen". Chem. Ber. Dtsch. Ges. 64 (10): 2591. doi:10.1002/cber.19310641002.
  4. ^ P. Gütlich; H.A. Goodwin (2004). Spin Crossover in Transition Metal Compounds I. Springer Berlin. ISBN 978-3-540-40396-8.
  5. ^ Fujii, S.; Yoshimura, T. (2000). "A new trend in iron–dithiocarbamate complexes: as an endogenous NO trapping agent". Coordination Chemistry Reviews. 198: 89–99. doi:10.1016/S0010-8545(99)00196-4.
  6. ^ Pasek, E. A.; Straub, D. K. (1972). "Tris(N,N-disubstituted Dithiocarbamato)iron(IV) Tetrafluoroborates". Inorganic Chemistry. 11 (2): 259–263. doi:10.1021/ic50108a012.