1290593-12-2

Basic information

• Product Name: bis(1-butyl-2-diphenylphosphino-3-methylimidazolium)tetrachloridorhodium(III) hexafluorophosphate
• CAS NO: 1290593-12-2
• Molecular Weight: 1036.48
• Mol File: 1290593-12-2.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: bis(1-butyl-2-diphenylphosphino-3-methylimidazolium)tetrachloridorhodium(III) hexafluorophosphate(CAS DataBase Reference)
• NIST Chemistry Reference: bis(1-butyl-2-diphenylphosphino-3-methylimidazolium)tetrachloridorhodium(III) hexafluorophosphate(1290593-12-2)
• EPA Substance Registry System: bis(1-butyl-2-diphenylphosphino-3-methylimidazolium)tetrachloridorhodium(III) hexafluorophosphate(1290593-12-2)

Safety Data

• Hazardous Substances Data: 1290593-12-2(Hazardous Substances Data)

Upstream product

• 174501-64-5 3-butyl-1-methyl-1H-imidazol-3-ium hexafluorophosphate 
• 1112-67-0 tetrabutyl-ammonium chloride 

Relevant articles and documents

Stable ionic Rh(I,II,III) complexes ligated by an imidazolium-substituted phosphine with π-acceptor character: Synthesis, characterization, and application to hydroformylation

The stable ionic Rh(I,II,III) complexes [RhI(acac)(CO)(L)] PF6 (2), [RhII2(OAc)4(L) 2]2PF6 (3), and [RhIIICl4(L) 2]PF6 (4) were synthesized through the complexation of RhI(acac)(CO)2, RhII2(OAc) 4(H2O)2, and RhIIICl 3·3H2O with the phosphine-functionalized ionic liquid (FIL) 1 ([L]PF6, L = 1-butyl-2-diphenylphosphino-3- methylimidazolium), respectively. The cation of L in 1 is an imidazolium-substituted phosphine with a positive charge vicinal to the P(III) atom, which acts as an electron-deficient donor with π-acceptor character to afford the stable complexes 2-4 due to the presence of retrodonating π-binding between Rh-P linkage. Due to the weakened reducing ability of L, the redox reaction between L and RhCl3·3H2O during the complexation is avoided, leading to the formation of 4, in which the Rh center is in the +3 valence state. Single-crystal X-ray analyses show that 2-4 are all composed of a Rh-centered cation and a PF6- counteranion. The cation of 2 possesses structural similarity to Rh I(acac)(CO)(PPh3), the cation of 3 with a D4h geometry possesses a structural similarity to RhII 2(OAc)4(PPh3)2, and the cation of 4 exhibits an ideal RhIII-centered octahedral geometry, in which the Rh(III) (d6) ion is six-coordinated by four chlorine atoms in the equatorial plane and two L ligands in the axial positions. TG/DTG analyses indicated that the thermal stabilities of 2-4 in air flow were improved dramatically in comparison to the corresponding analogues RhI(acac) (CO)(PPh3), RhII2(OAc)4(PPh 3)2, and RhICl(PPh3)3. 2-4 were found to be good to excellent catalysts for homogeneous hydroformylation of 1-octene free of any auxiliary ligand; 3 was the best candidate. The on water effect in rate acceleration was evidently observed over 2 and 4 due to their insensitivity to moisture and oxygen.