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• W2004368368 abstract "A method for the synthesis of new heterometallic dendritic molecules containing organoplatinum centers is reported. Reaction of Pt(2)Me(4)(&mgr;-SMe(2))(2) with bpy-Fc(2) (1) (bpy-Fc(2) = 4,4'-bis(ferrocenylvinyl)-2,2'-bipyridine) gave the platinum(II) complex PtMe(2)(bpy-Fc(2)) (2). Complex 2 undergoes oxidative addition with iodomethane to yield PtMe(3)I(bpy-Fc(2)) (3) and with bis(bromomethyl)benzenes to yield complexes of the type [PtMe(2)Br(bpy-Fc(2))CH(2)-](2)R (4, R = 1,2-C(6)H(4); 5, R = 1,3-C(6)H(4); 6, R = 1,4-C(6)H(4)). 1, 3, and 4 were characterized by X-ray structure determinations. For 1, a = 11.780(3) Å, b = 10.662(3) Å, c = 11.642(3) Å, beta = 118.61(2) degrees, and V = 1283.7(6) Å(3) while, for 2, a = 11.497(2) Å, b = 22.796(6) Å, c = 15.801(3) Å, beta = 106.08(1) degrees, and V = 3979(2) Å(3). Only poor quality crystals of 4 could be obtained resulting in a partial structure refinement with a = 14.46(1) Å, b = 15.14(1) Å, c = 21.32(2) Å, alpha = 69.45(4) degrees, beta = 71.14(5) degrees, gamma = 81.86(5) degrees and V = 4140(6) Å(3). The preferred conformation for 1 places the the bipyridine groups anti with respect to each other. However, as a consequence of the coordination to the metal centers in 3 and 4, they are located cis to each other, and the cyclopentadienyl rings attached directly to the vinyl groups lie on the same plane. In compound 4 the planes containing the platinum bipyridine units lie above and below the plane of the benzene ring, presumably to minimize steric hindrance. 2 also reacts with 1,3,5-tris(bromomethyl)mesitylene, 1,2,4,5-tetrakis(bromomethyl)benzene, and 1,2,3,4,5,6-hexakis(bromomethyl)benzene in 3:1, 4:1, and 6:1 molar ratios to yield the dendritic molecules [PtMe(2)Br(bpy-Fc(2))CH(2)-](n)()R [7, n = 3, R = 1,3,5-C(6)(CH(3))(3); 8, n = 4, R = 1,2,4,5-C(6)H(2); 9, n = 6, R = 1,2,3,4,5,6-C(6)], respectively. The largest dendrimer 9 contains six platinum and 12 ferrocene centers. Each complex undergoes a single 2n-electron electrochemical oxidation (corresponding to the ferrocenium/ferrocene couple of the bpy-Fc(2) ligands), confirming that the pendant ferrocenyl units are noninteracting. The number of ferrocene centers for each complex was determined both by exhaustive electrolysis and by a chronocoulometric/voltammetric assay." @default.
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• W2004368368 date "1997-05-01" @default.
• W2004368368 modified "2023-10-18" @default.
• W2004368368 title "Synthesis, Characterization, and Electrochemistry of Heterometallic Dendrimers" @default.
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• W2004368368 doi "https://doi.org/10.1021/ic961435j" @default.
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