The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.13991-08-7, Name is 1,2-Bis(diphenylphosphino)benzene, molecular formula is C30H24P2. In a Article，once mentioned of 13991-08-7, Recommanded Product: 1,2-Bis(diphenylphosphino)benzene
Rhenium(I) N-heterocyclic carbene complexes of the type [HNCH2CH2NHCRe(L-L)(CO)3]+ have been prepared, where L-L = 4,4?-dimethoxy-2,2?-bipyridine (2), 4,4?-bis(tert-butyl)-2,2?-bipyridine (3), 2,2?-bipyridine (4), 4,4?-dichloro-2,2?-bipyridine (5), 4,4?-bis(carbomethoxy)-2,2?-bipyridine (6), 5-phenyl-1,10-phenanthroline (7), and o-phenylenebis(diphenylphosphine) (8). The molecular structures of 4, 6, and 8 have been determined by X-ray analyses and show Re-C(carbene) bond distances of 2.171(7), 2.163(4), and 2.199(6) A, respectively. HF-SCF and MP2 calculations on the model compound [HNCH2CH2NHCRe(NHCHCHNH)-(CO)3]+ (4m) show that the HOMO is nonbonding d(Re) and the LUMO is mainly pi*(diimine) with partial pz(carbene) character. CIS calculations on the excited state of optimized 4m suggest that the lowest energy absorption originates from a HOMO to LUMO spin-forbidden transition. Complexes 2-7 are emissive at room temperature and 77 K. The room-temperature and 77 K luminescence data of 2-6 are consistent with emission from a 3-MLCT state. The nature of the emission of 7 at room temperature is also 3MLCT but changes to IL at 77 K. Complex 8 does not emit at room temperature, but at 77 K, the IL pi(pdpp) ? pi(pdpp) emission is observed. The combination of detailed spectroscopic studies and theoretical calculations reveal that the emitting state at room temperature is 3[d(Re) ? pi*-(diimine)], with the latter exhibiting partial sigma*(carbene) parentage. The excited-state energies and redox potentials can be tuned using diimine ligands with varying electron-donating/accepting abilities.
Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions.Recommanded Product: 1,2-Bis(diphenylphosphino)benzene, you can also check out more blogs about13991-08-7
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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate