5- -2,2 bipyridine, reaction with platinum

Platinum (260-262) and palladium (262,263) complexes have been incorporated into dendrimeric materials. Polymers incorporating both platinum and palladium units coordinated to bipyridine ligands have been reported by Pudde-phatt and co-workers (114) (262). These dendrimers were prepared via oxidative addition of a C—Br bond to a platinum complex, giving the core molecule. Further reaction with platinum or palladium complexes resulted in the homo- or heterometallic materials, respectively. 

Despite the interest in B(C6Fs)3 as a Lewis acid catalyst for organic reactions or a co-catalyst for olefinic polymerizations, little is known of its reaction with water. There is a report of the compound [NHEt3][HOB(C6F5)3] [158] and of the platinum complex, [Pt[HOB(C6Fs)3 Me(Bu2bpy)](Bu2bpy = 4,4 -di-ferf-butyl-2,2 -bipyridine),... 

Dendrimers containing a- and metal-bipyridine-bonded platinum and palladium complexes have been prepared.323-327 Puddephatt and co-workers have generated dendrimers containing both palladium and platinum complexes coordinated to bidentate ligands, 276.325 Dendrimer 276 was synthesized via oxidative-addition of a C—Br bond to a platinum complex to form the dendrimer core. Subsequent reaction with metal complexes gave homo- or heterometallic materials. 

Some platinum metals, especially ruthenium but also rhenium, osmium, and iridium, form luminescent complexes with nitrogen-containing ligands, e.g., 2,2 -bipyridine (bpy). These complexes may participate in redox reactions with concomitant chemiluminescence in three different ways. 

A platinum complex with a bipyridine as the most widely used ligand is easily prepared in high yields by reaction with Pt(Me)2(DMSO)2 in toluene to give an air- and moisture-stable product. The ligand exchange reactions proceed easily with other ligands such as phosphine, CO, and pyridine derivative, as shown in Eq. (7.8) [48]. 

The reaction of alcohols with CO can also be catalysed by palladium iodides, and various ligands or solvents. Acetic acid is prepared by the reaction of MeOH with CO in the presence of a catalyst system comprising a palladium compound, an ionic iodide compound, a sulfone solvent at conditions similar to those of the rhodium system (180 °C, 60 bar), and, in some cases, traces of a nickel-bipyridine compound were added. Sulfones or phosphine oxides play a stabilising role in preventing metal precipitation [26], Palladium(II) salts catalyse the carbonylation of methyl iodide in methanol to methyl acetate in the presence of an excess of iodide, even without amine or phosphine co-ligands platinum(II) salts are less effective [27],... 

Recent studies indicate the reaction of platina-/3-diketone with bipyridines via oxidative addition yields the diacyl hydrido Pt(IV) complex. Further ligand abstraction may result in H bond bridged dimer and a double-deck dimer through Pt Pt interaction (Scheme 17). On the other hand, the prototype of unsupported cis- diacyl platinum(II) species was obtained either via nucleophilic addition to cationic acyl carbonyl complexes or CO insertion into a trans acyl alkyl complex (Scheme 18). In the latter process for propionyl methyl or acetyl ethyl complex. 

A series of complexes with bipyridine ligands has also been described <2003EJI2749, 2004EJI4484, 20060M2074>.The reaction between 6,6 -diphenyl-2,2 -bipyridine 124 and [Pt(Me)2(DMSO)2] was carried out with a platinum/ligand ratio of 2 1 in toluene at 80 °C (Equation 44). The reaction was slow and led to the isolation of a yellow product that was insoluble in the reaction medium, was stable in air, and had high thermal stability <2006OM2253>. 

Detector Chemiluminescence following post-column reaction. A 1 mM solution of Ru(2,2 -bipyridinels in 50 mM sodium sulfate (continuously sparged with helium) was oxidized to Ru(2,2 -bipyridine)3 " using a Princeton Applied Research Model 174Apolarographic analyzer with a platinum gauze working electrode, a platinum wire auxilituy electrode, and a silver wire reference electrode. The Ru solution pumped at 0.3 mlVmin mixed with the column effluent in the flow cell of the detector, a fluorescence detector with the li t source removed. 

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