Cyclopalladated Complexes of Perylene Imine: Formation of Acetato-Bridged Dinuclear Complexes with 6,6- and 5,6-Membered Metallacycles
摘要:
Perylene-3-carbaldehyde (1) was condensed with 4-ethylaniline to give 3-perilenylmetilen-4'-ethylaniline (2). The metalation reaction of 2 with palladium acetate, in toluene at 60 degrees C, produced a mixture of palladium complexes where the two major components, 3 and 4, have been characterized as acetate-bridged dimers. Complex 3 is made of two identical six-membered endo cyclometalated Pd(C boolean AND N) moieties, in which the palladium is bound to the peri site with anti arrangement. Compound 4 is the first example combining six- and five-membered metallacycles in a dinuclear compound and adopts an unusual syn arrangement of metal ligands. The X-ray structures of 3 and 4 show pi-pi stacking of perylenyl rings, intermolecular for 3 and intramolecular for 4. The intramolecular pi-pi stacking in 4 has a detrimental effect on luminescence. The imine 2 and all the palladium complexes exhibit fluorescence associated with the perylene fragment, with emission quantum yields, in solution at room temperature, in the range 0.04-0.13 (and emission lifetimes similar to 5 ns). The similarity of the luminescence spectral pattern of the imine and their metalated complexes to that of perylene, although red-shifted, strongly suggests a perylene-dominated intraligand pi-pi* emissive state, metal-perturbed by interaction of the palladium fragment.
Higher fluorescence in platinum(<scp>iv</scp>) orthometallated complexes of perylene imine compared with their platinum(<scp>ii</scp>) or palladium(<scp>ii</scp>) analogues
作者:J. Emilio Expósito、Marta Álvarez-Paíno、Gabriel Aullón、Jesús A. Miguel、Pablo Espinet
DOI:10.1039/c5dt02572a
日期:——
reaction of 3-perylenylmethylen-4′-ethylaniline (1) with [Pt2Me4(μ-SMe2)2] (and subsequent addition of PPh3) or with [Pt2(η3-C4H7)2(μ-Cl)2] produced cyclometallated PtII complexes [Pt(C^N)Me(PPh3)] (2) and, respectively, [Pt2(C^N)2(μ-Cl)2] (3) (HC^N = 3-C20H11CHNC6H4-p-C2H5), with Pt bound to the ortho site of the perylenyl fragment. From3 the mononuclear complexes [Pt(C^N)L2] (L2 = acac (4); S2COMe (5);
Cyclopalladated Complexes of Perylene Imine: Formation of Acetato-Bridged Dinuclear Complexes with 6,6- and 5,6-Membered Metallacycles
作者:Sergio Lentijo、Jesús A. Miguel、Pablo Espinet
DOI:10.1021/om1010929
日期:2011.3.14
Perylene-3-carbaldehyde (1) was condensed with 4-ethylaniline to give 3-perilenylmetilen-4'-ethylaniline (2). The metalation reaction of 2 with palladium acetate, in toluene at 60 degrees C, produced a mixture of palladium complexes where the two major components, 3 and 4, have been characterized as acetate-bridged dimers. Complex 3 is made of two identical six-membered endo cyclometalated Pd(C boolean AND N) moieties, in which the palladium is bound to the peri site with anti arrangement. Compound 4 is the first example combining six- and five-membered metallacycles in a dinuclear compound and adopts an unusual syn arrangement of metal ligands. The X-ray structures of 3 and 4 show pi-pi stacking of perylenyl rings, intermolecular for 3 and intramolecular for 4. The intramolecular pi-pi stacking in 4 has a detrimental effect on luminescence. The imine 2 and all the palladium complexes exhibit fluorescence associated with the perylene fragment, with emission quantum yields, in solution at room temperature, in the range 0.04-0.13 (and emission lifetimes similar to 5 ns). The similarity of the luminescence spectral pattern of the imine and their metalated complexes to that of perylene, although red-shifted, strongly suggests a perylene-dominated intraligand pi-pi* emissive state, metal-perturbed by interaction of the palladium fragment.