Abstract
The reaction of Ru5(CO)15(μ5-C), 1, with Pt(PBut3)2 at room temperature yielded the mixed-metal cluster complex PtRu5(CO)15(PBut3)(C), 2, in 52% yield. Compound 2 consists of a mixture of two interconverting isomers in solution. One isomer, 2A, can be isolated by crystallization from benzene/octane solvent. The second isomer, 2B, can be isolated by crystallization from diethyl ether. Both were characterized crystallographically. Isomer 2A consists of a square pyramidal cluster of five ruthenium atoms with a phosphine-substituted platinum atom spanning the square base. Isomer 2B consists of a square pyramidal cluster of five ruthenium atoms with a phosphine-substituted platinum atom on an edge on the square base. The two isomers interconvert rapidly on the NMR time scale at 40 °C, ΔG313‡ = 11.4(8) kcal mol-1, ΔH‡ = 8.8(5) kcal mol-1, ΔS‡ = -8.4(9) cal mol-1 K-1. The reaction of Pd(PBut3)2 with compound 1 yielded two new cluster complexes: PdRu5(CO)15(PBut3)(μ6-C), 3, in 50% yield and Pd2Ru5(CO)15(PBut 3)2(μ6-C), 4, in 6% yield. The yield of 4 was increased to 47% when an excess of Pd(PBut3)2 was used. In the solid state compound 3 is structurally analogous to 2A, but in solution it also exists as a mixture of interconverting isomers; ΔG298‡ = 10.6(6) kcal mol-1, ΔH‡ = 9.7(3) kcal mol-1, and ΔS‡ = -3(1) cal mol-1 K-1 for 3. Compound 4 contains an octahedral cluster consisting of one palladium atom and five ruthenium atoms with an interstitial carbido ligand in the center of the octahedron, but it also has one additional Pd(PBut3) grouping that is capping a triangular face of the ruthenium cluster. The Pd(PBut3) groups in 4 also undergo dynamical interchange that is rapid on the NMR time scale at 25°C; ΔG298‡ = 11(1) kcal mol-1, ΔH‡ = 10.2(4) kcal mol-1, and ΔS‡ = -3(2) cal mol-1 K-1 for 4.
| Original language | English |
|---|---|
| Pages (from-to) | 2094-2101 |
| Number of pages | 8 |
| Journal | Inorganic Chemistry |
| Volume | 42 |
| Issue number | 6 |
| DOIs | |
| State | Published - Mar 24 2003 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Inorganic Chemistry
Cite this
Remarkable dynamical opening and closing of platinum and palladium pentaruthenium carbido carbonyl cluster complexes. / Adams, Richard D.; Captain, Burjor; Fu, Wei; Pellechia, Perry J.; Smith, Mark D.
In: Inorganic Chemistry, Vol. 42, No. 6, 24.03.2003, p. 2094-2101.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Remarkable dynamical opening and closing of platinum and palladium pentaruthenium carbido carbonyl cluster complexes
AU - Adams, Richard D.
AU - Captain, Burjor
AU - Fu, Wei
AU - Pellechia, Perry J.
AU - Smith, Mark D.
PY - 2003/3/24
Y1 - 2003/3/24
N2 - The reaction of Ru5(CO)15(μ5-C), 1, with Pt(PBut3)2 at room temperature yielded the mixed-metal cluster complex PtRu5(CO)15(PBut3)(C), 2, in 52% yield. Compound 2 consists of a mixture of two interconverting isomers in solution. One isomer, 2A, can be isolated by crystallization from benzene/octane solvent. The second isomer, 2B, can be isolated by crystallization from diethyl ether. Both were characterized crystallographically. Isomer 2A consists of a square pyramidal cluster of five ruthenium atoms with a phosphine-substituted platinum atom spanning the square base. Isomer 2B consists of a square pyramidal cluster of five ruthenium atoms with a phosphine-substituted platinum atom on an edge on the square base. The two isomers interconvert rapidly on the NMR time scale at 40 °C, ΔG313‡ = 11.4(8) kcal mol-1, ΔH‡ = 8.8(5) kcal mol-1, ΔS‡ = -8.4(9) cal mol-1 K-1. The reaction of Pd(PBut3)2 with compound 1 yielded two new cluster complexes: PdRu5(CO)15(PBut3)(μ6-C), 3, in 50% yield and Pd2Ru5(CO)15(PBut 3)2(μ6-C), 4, in 6% yield. The yield of 4 was increased to 47% when an excess of Pd(PBut3)2 was used. In the solid state compound 3 is structurally analogous to 2A, but in solution it also exists as a mixture of interconverting isomers; ΔG298‡ = 10.6(6) kcal mol-1, ΔH‡ = 9.7(3) kcal mol-1, and ΔS‡ = -3(1) cal mol-1 K-1 for 3. Compound 4 contains an octahedral cluster consisting of one palladium atom and five ruthenium atoms with an interstitial carbido ligand in the center of the octahedron, but it also has one additional Pd(PBut3) grouping that is capping a triangular face of the ruthenium cluster. The Pd(PBut3) groups in 4 also undergo dynamical interchange that is rapid on the NMR time scale at 25°C; ΔG298‡ = 11(1) kcal mol-1, ΔH‡ = 10.2(4) kcal mol-1, and ΔS‡ = -3(2) cal mol-1 K-1 for 4.
AB - The reaction of Ru5(CO)15(μ5-C), 1, with Pt(PBut3)2 at room temperature yielded the mixed-metal cluster complex PtRu5(CO)15(PBut3)(C), 2, in 52% yield. Compound 2 consists of a mixture of two interconverting isomers in solution. One isomer, 2A, can be isolated by crystallization from benzene/octane solvent. The second isomer, 2B, can be isolated by crystallization from diethyl ether. Both were characterized crystallographically. Isomer 2A consists of a square pyramidal cluster of five ruthenium atoms with a phosphine-substituted platinum atom spanning the square base. Isomer 2B consists of a square pyramidal cluster of five ruthenium atoms with a phosphine-substituted platinum atom on an edge on the square base. The two isomers interconvert rapidly on the NMR time scale at 40 °C, ΔG313‡ = 11.4(8) kcal mol-1, ΔH‡ = 8.8(5) kcal mol-1, ΔS‡ = -8.4(9) cal mol-1 K-1. The reaction of Pd(PBut3)2 with compound 1 yielded two new cluster complexes: PdRu5(CO)15(PBut3)(μ6-C), 3, in 50% yield and Pd2Ru5(CO)15(PBut 3)2(μ6-C), 4, in 6% yield. The yield of 4 was increased to 47% when an excess of Pd(PBut3)2 was used. In the solid state compound 3 is structurally analogous to 2A, but in solution it also exists as a mixture of interconverting isomers; ΔG298‡ = 10.6(6) kcal mol-1, ΔH‡ = 9.7(3) kcal mol-1, and ΔS‡ = -3(1) cal mol-1 K-1 for 3. Compound 4 contains an octahedral cluster consisting of one palladium atom and five ruthenium atoms with an interstitial carbido ligand in the center of the octahedron, but it also has one additional Pd(PBut3) grouping that is capping a triangular face of the ruthenium cluster. The Pd(PBut3) groups in 4 also undergo dynamical interchange that is rapid on the NMR time scale at 25°C; ΔG298‡ = 11(1) kcal mol-1, ΔH‡ = 10.2(4) kcal mol-1, and ΔS‡ = -3(2) cal mol-1 K-1 for 4.
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UR - http://www.scopus.com/inward/citedby.url?scp=0037464348&partnerID=8YFLogxK
U2 - 10.1021/ic020656o
DO - 10.1021/ic020656o
M3 - Article
VL - 42
SP - 2094
EP - 2101
JO - Inorganic Chemistry
JF - Inorganic Chemistry
SN - 0020-1669
IS - 6
ER -