Hydridotetrakis(triphenylphosphine)rhodium(I)

Hydridotetrakis(triphenylphosphine)rhodium(I)
Identifiers
CAS Number	18284-36-1;
3D model (JSmol)	Interactive image;
ChemSpider	23089353;
ECHA InfoCard	100.153.466
CompTox Dashboard (EPA)	DTXSID50719953 ;
	SMILES 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.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.[Rh][H];
Properties
Chemical formula	C72H61P4Rh
Molar mass	1153.12
Appearance	yellow solid
Density	1.328 g/cm3
Melting point	162–163 °C (324–325 °F; 435–436 K)
Hazards
GHS pictograms
GHS Signal word	Warning
GHS hazard statements	H315, H319, H335
GHS precautionary statements	P261, P264, P271, P280, P302+352, P304+340, P305+351+338, P312, P321, P332+313, P337+313, P362, P403+233, P405, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Hydridotetrakis(triphenylphosphine)rhodium(I) is the coordination complex with the formula HRh[P(C₆H₅)₃]₄. It consists of a Rh(I) center complexed to four triphenylphosphine (PPh₃) ligands and one hydride. The molecule has idealized C_3v symmetry.[1] The compound is a homogeneous catalyst for hydrogenation and related reactions.[2] It is a yellow solid that dissolves in aromatic solvents.

Preparation

In the presence of base, H₂, and additional triphenylphosphine, Wilkinson's catalyst (chloridotris(triphenylphosphane)rhodium(I)) converts to HRh(PPh₃)₄:[3]

RhCl(PPh₃)₃ + H₂ + KOH + PPh₃ → RhH(PPh₃)₄ + H₂O + KCl

References

Baker, R. W.; Pauling, Peter (1969). "The crystal and molecular structure of tetrakistriphenylphosphinerhodium(I) hydride". Journal of the Chemical Society D: Chemical Communications (24): 1495. doi:10.1039/c29690001495.
Eduardo Peña-Cabrera "Hydridotetrakis(triphenylphosphine)rhodium" Encyclopedia of Reagents for Organic Synthesis, 2001, John Wiley & Sons. doi:10.1002/047084289X.rh030m
Ahmad, N.; Levison, J. J.; Robinson, S. D.; Uttley, M. F. (2007). "Hydrido Phosphine Complexes of Rhodium(I)". Inorg. Synth. 28: 81–83. doi:10.1002/9780470132593.ch19.

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[1] Baker, R. W.; Pauling, Peter (1969). "The crystal and molecular structure of tetrakistriphenylphosphinerhodium(I) hydride". Journal of the Chemical Society D: Chemical Communications (24): 1495. doi:10.1039/c29690001495.

[2] Eduardo Peña-Cabrera "Hydridotetrakis(triphenylphosphine)rhodium" Encyclopedia of Reagents for Organic Synthesis, 2001, John Wiley & Sons. doi:10.1002/047084289X.rh030m

[3] Ahmad, N.; Levison, J. J.; Robinson, S. D.; Uttley, M. F. (2007). "Hydrido Phosphine Complexes of Rhodium(I)". Inorg. Synth. 28: 81–83. doi:10.1002/9780470132593.ch19.