In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 1941-30-6, name is Tetrapropylammonium bromide, introducing its new discovery. COA of Formula: C12H28BrN
Synthesis, spectroscopic and x-ray structure characterisation of bis(tetramethylammonium), bis(tetraethylammonium) and bis(tetrapropylammonium) tetrathiotungstates
The three new tetraalkylammonium tetrathiotungstates ((Me) 4N)2[WS4] (1), ((Et)4N) 2[WS4] (2) and ((nPr)4N)2[WS 4] (3) were prepared via a direct salt substitution using (NH 4)2[WS4] as starting material. Compound 1 crystallises in the chiral orthorhombic space group P212 121 with a = 8.9433(4), b = 15.5658(9) and c = 37.279(2) A. Compound 2 crystallises in space group P21/n with lattice parameters a = 16.6695(12), b = 9.3415(6), c = 16.9965(13) A and beta = 117.185(15). The third compound 3 crystallises in space group C2/c with the lattice parameters a = 32.440(2), b = 13.8453(6), c = 15.0563(10) A and beta = 109.19(7). The structures of all compounds consist of slightly distorted [WS4]2- tetrahedra and tetraalkylammonium cations which are packed in different ways. One interesting observation is that the disorder of parts of the alkyl groups decreases with increasing chain length. The IR and Raman spectra show the vibrations of the [WS 4]2- tetrahedron with a slight shift with increasing alkyl chain length. The most prominent IR-band of the [WS4]2- tetrahedra is broad but not split, indicating that the distortion of the tetrahedra is small.
The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 1941-30-6 is helpful to your research. COA of Formula: C12H28BrN
Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI