Paramagnetic complexes platinum

Platinum(II) compounds are to be found only towards the bottom of this scheme, palladium(II) reaches further up, its fluoride belonging to the tetragonal, paramagnetic class. Nickel(II) complexes cover the whole range of behavior, and may in addition be tetrahedral. 

Apart from the platinum and nickel compounds with cr-bonded alkyl or aryl ligands, Chatt s group reported between 1961 and 1966 the synthesis of an impressive series of related cobalt(II), iron(II), rhodium(III), iridium(III), rhe-nium(III) and rhenium(V) complexes [39-42]. The paramagnetic cobalt(II) and iron(II) derivatives MR2(PR 3)2 were stable when R was an aryl group with... 

The reaction of 1,3,5-cycloheptatriene with CsHsCrCla in the presence of iso-C3H7MgBr under UV irradiation, followed by treatment with methanol, yields the brown, paramagnetic (/Xeff=1.63 B.M.), air-sensitive complex, (l,3,5-cycloheptatriene)(cyclopentadienyl)chrom-ium (19) (207). The complex is readily dehydrogenated with platinum to C7H7Cr(C5H5) or oxidized with oxygen in acetone-water to yield the... 

Properties of the iodine pentafluoride-platinum pentafluoride adduct. The solid, m. p. 140°, begins to decompose at 180° this is complete at 300° and the residue is platinum tetrafluoride. The adduct is paramagnetic, p = 0-65 B.M. (23°). The X-ray powder pattern was complex and no attempt was made to index it. Water reacted vigorously with it to give a solution containing the hexafluoroplatinate(iv) ion. Reaction with most organic solvents was exothermic and complex, but carbon tetrachloride neither reacted with nor dissolved it. 

In this chapter and in an upcoming review (Part II), the chemistry of mononuclear paramagnetic organometallic complexes of the second- and third-row groups 9(VIIIB) and lO(VlII) platinum metals (Rh, Ir, Pd, Pt) are summarized. In this chapter, the higher valent species (Rh(II), Ir(II), Rh(IV), Ir(IV), Pd(ni), Pt(III) and complexes with oxidized redox noninnocent ligands) are described. In the next chapter, the lower valent species (Rh(0), lr(0), Pd(I), Pt(I), and complexes with reduced redox noninnocent ligands will be discussed. 

The constitution of the platinum complex has been elucidated by crystal structure investigation 82), and the molecule (XXXVa-e) has been found to be completely planar. The interatomic distances and bond angles are given in Fig. 2. As would be expected, the nickel compound is diamagnetic, and the cobalt and iron compounds show paramagnetism, corresponding with one and two unpaired d-electrons, respectively 41). These... 

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