39773-08-5

Usage

Uses

Used in Chemical Synthesis:
Rh2(acetate)4(PPh3)2 is used as a catalyst for various organic reactions, including hydrogenation, hydroformylation, and cyclopropanation. Its ability to facilitate these reactions is attributed to the stabilizing and reactivity-enhancing effects of the triphenylphosphine ligands on the rhodium atoms.
Used in Pharmaceutical Industry:
In the pharmaceutical industry, Rh2(acetate)4(PPh3)2 is utilized as a catalyst for the synthesis of complex organic molecules that serve as active pharmaceutical ingredients. Its efficiency in catalyzing key reactions allows for the production of these compounds with high yields and selectivity, contributing to the development of novel drugs.
Used in Material Science:
Rh2(acetate)4(PPh3)2 is employed in the field of material science for the synthesis of advanced materials with specific properties. Its catalytic capabilities enable the production of materials with tailored characteristics, such as improved conductivity, strength, or stability, which are essential for various applications, including electronics and energy storage.
Used in Environmental Applications:
In environmental applications, Rh2(acetate)4(PPh3)2 is used as a catalyst for the conversion of harmful pollutants into less toxic or environmentally benign products. Its ability to facilitate challenging chemical transformations makes it a valuable tool in the development of sustainable processes for waste treatment and pollution control.

Upstream product

• 603-35-0 triphenylphosphine 
• 80419-75-6 {Rh₂(acetate)4(acetonitrile)2} 

Relevant academic research and scientific papers

Excited-state properties of Rh2(O2CCH3)4(L)2 (L = CH3OH, THF, PPh3, py)

The photophysical properties of Rh2(O2CCH3)4(L)2 (L = CH3OH, THF = tetrahydrofuran, PPh3 = triphenylphosphine, py = pyridine) were explored upon excitation with visible light. Time-resolved absorption shows that all the complexes possess a long-lived transient (3.5-5.0 μs) assigned as an electronic excited state of molecules, and they exhibit an optical transition at ～760 nm whose position is independent of axial ligand. No emission from the Rh2(O2CCH3)4(L)2(L = CH3OH, THF, PPh3, py) systems was detected, but energy transfer from *Rh2(O2CCH3)4 (PPh3)2 to the 3ππ* excited state of perylene is observed. Electron transfer from *Rh2(O2CCH3)4 (PPh3)2 to 4,4′-dimethyl viologen (MV2+) and chloro p-benzoquinone (Cl-BQ) takes place with quenching rate constants (kq) of 8.0 × 106 and 1.2 × 106 M-1 s-1 in methanol, respectively. A kq value of 2 × 108 M-1 s-1 was measured for the quenching of the excited state of Rh2(O2CCH3)4 (PPh3)2 by O2 in methanol. The observations are consistent with the production of an excited state with excited-state energy, E00, between 1.34 and 1.77 eV.

Infrared, Raman, resonance Raman, and excitation profile studies of Rh2(O2CCH3)4(PPh3) 2 and Its 18O and CD3 isotopomers

The resonance Raman spectra of Rh2(O2CCH3)4(PPh3) 2 and its 18O and CD3 isotopomers have been recorded at ca. 80 K. A band at 289 cm-1, denoted v1, is assigned to v(Rh-Rh) and is the dominant progression-forming mode. This band also forms combinations with bands attributable to the tetraacetate cage, such as v(Rh-O) and δ(OCO), as well as with those of the axial PPh3 ligands. Excitation profiles of v(Rh-Rh) and several other bands are shown to maximize under the 376-nm electronic absorption band, which, by way of Raman band depolarization ratio measurements, is assigned to an axial (z) polarized transition terminating in σ*(RhRh). Bands assigned to v(Rh-O) are shown to be dependent on both 18O and CD3 substitution. For Rh2(O2CCH3)4(PPh3) 2, Raman spectra obtained with 514.5-nm excitation are also discussed. FTIR spectra (3500-40 cm-1) of Rh2(O2CCH3)4(PPh3) 2 and its 18O and CD3 isotopomers are also presented and assigned. The results provide a firm basis for making vibrational band assignments for other dimetal tetracarboxylates.

Axial-ligand substitution reactions of dirhodium(II) tetraacetate with phosphines and phosphites in acetonitrile

The kinetic and thermodynamic parameters for the axial-ligand substitution reactions of the bis(acetonitrile) adduct of dirhodium(II) tetraacetate with a variety of phosphines and phosphites in acetonitrile have been measured. The rate-determining formation of the Rh2(O2CCH3)4(CH 3CN)PR3 adduct occurs with a rate constant that is independent of the nature of the ligand: k1(25.0°C) = (1.05 ± 0.05) × 105 M-1 s-1, ΔH1? = 10.9 ± 0.6 kcal mol-1, and ΔS1? = 1 ± 2 cal K-1 mol-1. Slightly higher rate constants (1.6 × 105 M-1 s-1 at 25.0°C) were found for several diphosphines (PPh2(CH2)nPPh2, n = 2-4) and are attributed to the presence of two ligand coordination sites. A dissociative mechanism is proposed for substitution of the axially coordinated acetonitrile, and the rate parameters are compared with values reported for substitutions of oxygen-donor solvent molecules on the dirhodium(II) complex. The stability constants for the mono- and bisadducts have been measured at 25°C with K1/K2 ～ 20. The dependence of K1 and K2 on the nature of the phosphine or phosphite correlates well with the σ-donor strength of the ligand, with π-acceptor strengths and steric effects being relatively insignificant.