4-Diphenylphosphino-2,2 :6 ,2“terpyridine, 40 2-

An interesting example is the iron(III) dimethyldithiocarbamato complex [181] [Fe((CH3)2NC(S)S)3] where the unit cell amounts to 44.4 per Fe atom or 26.7 cm mol This value is somewhat higher than the AF° values of Table 16. It should be noted, however, that the dithiocarbamato complex is of [Fe Sg] type, whereas the iron(III) complexes in Table 16 are examples of the type [Fe -N4.02]. As far as cobalt(II) is concerned, for the complex [Co(nnp)(NCS)2] where nnp = AT-[(diphenylphosphino)ethyl]-JV -diethylethyl-enediamine [182, 183], the volume change has been obtained as 21.5 per Co atom or 13.0cm mol S whereas for [Co(terpy)2]l2 2H20 [132] where terpy = 2,2, 2"-terpyridine, the corresponding results are 33.7 A per Co atom or 20.3 cm moP Again this value is higher than the AV° value for the closely related [Co(terpy)2]Cl2 complex of Table 16. 

It has been found that the use, as ligands, of electron-poor phosphines, such as 1,1 -bis(diphenylphosphino)ferrocene, enhances yields ill the palladium-catalysed reaction of aiyl bromides with sodium phenoxides to yield diaryl ethers.87 Palladium-catalysed coupling of ethynylated derivatives of bipyridine or terpyridine with the corresponding bipyridine or terpyridine hahdes or triflates has been used in the synthesis of preorganized polytopic ligands.88... 

Mak ef al. employed [Fe(CO)4(Ph2PPy)2] 42 (Ph2PPy = 2-(diphenylphosphino)pyridine) to construct a series of heterobimetallic compounds with an Fe-M dative bond. The iron center in 42 is zero-valent and electron rich and, together with the two pendant pyridyl groups, can be viewed as a structural analog of terpyridine. A rather comprehensive series of metal salts were incorporated, including Cu(i), Ag(i), Zn(ii), Cd(ii), Hg(ii), and other first-row transition elements, such as Fe, Co, and... 

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