title: Definitive evidence for the existence of the "sitting-atop" porphyrin complexes in nonaqueous solutions.
abstract: Definitive evidence for the intermediate in metalloporphyrin formation produced in the interaction of meso-tetraphenylporphine and [Rh(CO)2Cl]2, the "sitting-atop" complex (SAT), is given in this article. The second-order kinetics of SAT complex formation, the small rate constant for the formation reaction, and the equilibrium study indicate a one-to-one complex between the meso-tetraphenylporphine and [Rh(CO)2Cl]2. The analytical data, infrared spectrum, and especially the proton magnetic resonance lead to a formulati-n of the "sitting-atop" complex shown in Fig. 8.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D008665:Metalloporphyrins; D008958:Models, Molecular; D011166:Porphyrins / Q000032:analysis
chemical_list: D008665:Metalloporphyrins; D011166:Porphyrins