The reaction of [Re2(mu-H)2(CO)8] with 1 equiv of Pt(COD)2 (COD = 1,5-cyclooctadiene) affords quantitatively the triangular cluster [Re2Pt(mu-H)2(CO)8(COD)], characterized spectroscopically and by X-ray analysis. The crystals are monoclinic, space group P2(1), with a = 7.217 (3) angstrom, b = 17.081 (5) angstrom, c = 8.577 (3) angstrom, beta = 109.96 (3)-degrees and Z = 2. The refinements, based on 2037 significant reflections, gave final agreement indices R and R(W) of 0.021 and 0.025, respectively. The ligand COD can be easily substituted by two PPh3 molecules. On the contrary, the reaction with 2 equiv of CO, at 190 K, leads to the substitution of COD by one CO and one HRe(CO)5 molecule, giving the complex [Re3Pt(mu-H)3(CO)14], whose structure has been elucidated by X-ray analysis. It gives triclinic crystals, space group P1, with a = 11.764 (1) angstrom, b = 13.737 (4) angstrom, c = 15.787 (3) angstrom, alpha = 64.83 (2)-degrees, beta = 83.36 (1)-degrees, gamma = 89.19 (2)-degrees, and Z = 4. The refinements, based on 4461 significant reflections, gave final agreement indices R and R(W) of 0.031 and 0.032, respectively. The structure contains a tetrametal cluster consisting of a Re2Pt triangle plus a Re atom, which belongs to an unusual HRe(CO)5 two-electron donor ligand, bound to the platinum atom. The H-1 NMR spectrum of this complex shows, at 180 K, the presence of two isomers.

Antognazza, P., Beringhelli, T., Dalfonso, G., Minoja, A., Ciani, G., Moret, M., et al. (1992). RHENIUM PLATINUM MIXED-METAL CLUSTERS - SYNTHESIS AND SOLID-STATE STRUCTURAL CHARACTERIZATION OF [RE2PT(MU-H)2(CO)8(COD)] AND OF [RE3PT(MU-H)3(CO)14]. ORGANOMETALLICS, 11(5), 1777-1784 [10.1021/om00041a009].

RHENIUM PLATINUM MIXED-METAL CLUSTERS - SYNTHESIS AND SOLID-STATE STRUCTURAL CHARACTERIZATION OF [RE2PT(MU-H)2(CO)8(COD)] AND OF [RE3PT(MU-H)3(CO)14]

MORET, MASSIMO;
1992

Abstract

The reaction of [Re2(mu-H)2(CO)8] with 1 equiv of Pt(COD)2 (COD = 1,5-cyclooctadiene) affords quantitatively the triangular cluster [Re2Pt(mu-H)2(CO)8(COD)], characterized spectroscopically and by X-ray analysis. The crystals are monoclinic, space group P2(1), with a = 7.217 (3) angstrom, b = 17.081 (5) angstrom, c = 8.577 (3) angstrom, beta = 109.96 (3)-degrees and Z = 2. The refinements, based on 2037 significant reflections, gave final agreement indices R and R(W) of 0.021 and 0.025, respectively. The ligand COD can be easily substituted by two PPh3 molecules. On the contrary, the reaction with 2 equiv of CO, at 190 K, leads to the substitution of COD by one CO and one HRe(CO)5 molecule, giving the complex [Re3Pt(mu-H)3(CO)14], whose structure has been elucidated by X-ray analysis. It gives triclinic crystals, space group P1, with a = 11.764 (1) angstrom, b = 13.737 (4) angstrom, c = 15.787 (3) angstrom, alpha = 64.83 (2)-degrees, beta = 83.36 (1)-degrees, gamma = 89.19 (2)-degrees, and Z = 4. The refinements, based on 4461 significant reflections, gave final agreement indices R and R(W) of 0.031 and 0.032, respectively. The structure contains a tetrametal cluster consisting of a Re2Pt triangle plus a Re atom, which belongs to an unusual HRe(CO)5 two-electron donor ligand, bound to the platinum atom. The H-1 NMR spectrum of this complex shows, at 180 K, the presence of two isomers.
Articolo in rivista - Articolo scientifico
RAY CRYSTAL-STRUCTURES; COMPLEXES; <PTRH2(MU-H)(MU-CO)2(CO)(PPH3)(ETA-C5ME5)2><BF4>; DIAZOALKANES; CHEMISTRY; LIGANDS
English
1992
11
5
1777
1784
none
Antognazza, P., Beringhelli, T., Dalfonso, G., Minoja, A., Ciani, G., Moret, M., et al. (1992). RHENIUM PLATINUM MIXED-METAL CLUSTERS - SYNTHESIS AND SOLID-STATE STRUCTURAL CHARACTERIZATION OF [RE2PT(MU-H)2(CO)8(COD)] AND OF [RE3PT(MU-H)3(CO)14]. ORGANOMETALLICS, 11(5), 1777-1784 [10.1021/om00041a009].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/32929
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