Platinum(II) complexes bearing 1,1 '-bis(diphenylphosphino)ferrocene as building blocks for functionalized redox active porphyrins
Articolo
Data di Pubblicazione:
2006
Citazione:
Platinum(II) complexes bearing 1,1 '-bis(diphenylphosphino)ferrocene as building blocks for functionalized redox active porphyrins / L.M. SCOLARO, M.R. PLUTINO, A. ROMEO, R. ROMEO, G. RICCIARDI, S. BELVISO, A. ALBINATI. - In: DALTON TRANSACTIONS. - ISSN 1477-9226. - :21(2006), pp. 2551-2559.
Abstract:
Reactions of the cationic complex ions [PtMe(Me2SO)(PP)](+) ( PP= dppf (1,1'-bis(diphenylphosphino) ferrocene) and dppe (1,2-bis(diphenylphosphino) ethane)) with 5,10,15,20-tetrakis(4-pyridyl)-21H, 23H-porphyrin (TpyP) led to the formation of the symmetrical tetraplatinated porphyrin complexes, [PtMe(PP)](4)TpyP center dot X-4 (PP= dppf, X= CF3SO3-, 3, and PP= dppe, X= BF4-, 5) containing the organometallic fragment {PtMe( PP)}. The precursor sulfoxide platinum complexes [PtMe(Me2SO)(dppf)] CF3SO3, 2 and [PtMe(Me2SO)(dppe)] BF4, 4, were prepared by halide abstraction from [PtMeCl(dppf)], 1, and by controlled protonolysis of [PtMe2(dppe)] respectively, in the presence of a small amount of dimethyl sulfoxide. All these starting platinum(II) compounds, as well as the porphyrin derivatives 3 and 5, were fully characterized through elemental analysis, H-1 NMR mono- and bidimensional, P-31{H-1}, P-31 - H-1 HMBC, UV/Vis absorption and photophysical measurements. The X-ray crystal structure of complex 1 has been determined. In order to ascertain the electronic influence of ferrocene, the spectroscopic and redox properties of 3 were compared with those of TPyP and of the analogous 5. Cyclic voltammetry ( CV), differential pulse voltammetry (DPV), H-1 and P-31 NMR data, and UV/ Vis data, all suggest a certain degree of communication between the central porphyrin and the peripheral hetero-bimetallic fragments. In contrast, no detectable interaction among these peripheral groups seem to come into play. Unlikely from the porphyrin derivative 5, formation of well defined fluorescent mesoscopic ring structures was easily achieved by simple evaporation from diluted dichloromethane solutions of 3.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
L.M. SCOLARO, M.R. PLUTINO, A. ROMEO, R. ROMEO, G. RICCIARDI, S. BELVISO, A. ALBINATI
Link alla scheda completa: