694528-57-9Relevant academic research and scientific papers
Synthesis and redistribution reactions of asymmetric σ-arylplatinum(II) complexes containing 4,7-phenanthroline
Gallasch, David P.,Woodhouse, Susan L.,Rendina, Louis M.
, p. 1288 - 1294 (2004)
The mononuclear σ-aryl complexes of the type trans -[Pt(σ -C6H4R)(4,7-phen)(PPh3)2] OTf (R=4-CO2SitBuPh2, 4-CONHMe, 3-CO2SitBuPh2, 3-CONHMe; OTf=trifluoromethanesulfonate) containing a monodentate 4,7-phenanthroline (4,7-phen) ligand were prepared by an oxidative addition reaction of an aryl iodide with Pt(PPh3) 4 to yield the key iodoplatinum(II) precursors trans -[PtI(σ-C6H4R)(PPh3) 2], followed by halogen metathesis with one equivalent of 4,7-phen. The reaction of trans -[Pt(σ-C6 H4R)(4,7-phen)(PPh3)2]OTf with labile complexes of the type trans -[Pt(OTf)L2(σ -C6H4R′)] (L=PEt3, R′=H; L=PPh3, R′=4-CO2SitBuPh2 3-CO2SitBuPh2, 3-CONHMe) afforded the asymmetric dinuclear complexes of the type trans -[Pt(σ -C6H4R)L2(μ-4,7-phen)Pt(σ -C6H4R′) L′2](OTf) 2 (L=PPh3, R=4-CO2SitBuPh2, L′=PEt3, R′=H; L=L′=PPh3, R=4-CONHMe, R′ =4-CO2SitBuPh2; R=4-CO2SitBuPh2, R′=3-CONHMe; R=3-CONHMe, R′=3 -CO2SitBuPh2) in which the 4,7-phen acts as a bridging bidentate ligand. The novel dinuclear species undergo an unusual redistribution reaction that is essentially thermoneutral at 298 K. The exchange process involves facile cleavage of a Pt-N bond and the rapid exchange of trans -[PtL2(σ-aryl)] units in the equilibrium mixture.
