Tetrachloroplatinate complexes

The diethynyl compounds 26, 38 and 41 showed a different type of ring closure on thermal decomposition of their tetrachloroplatinate complexes to give the 3-phenylbenzofulvene derivatives 51, 52 and 53, respectively 53 was also quantitatively obtained by treatment of 41 with mercuric acetate in acetic acid-sulphuric acid . 

Treatment of ligand 33 with aqueous K2PtCl4 gave the tetrachloroplatinate complex 34. Dissolution of complex 34 in DMSO resulted in the trinuclear cascade complex 35. In this complex each of the two potassium ions is encapsulated by... 

The South American form of trypanosomiasis is due to the parasite T, cruzi and is responsible for Chagas disease, which afflicts up to twenty million people and for which there is no known effective therapy. The status of chemotherapeutic agents has been reviewed [100]. The ethidium tetrachloroplatinate complex mentioned above has curative activity in mice, probably for the same reasons as in T, rhodesiense — increased dose due to less toxicity [101]. Early reports of the ability of cisplatin to inhibit infectivity were not substantiated [102] and are incorrect [103]. A survey of metal complexes for in vitro activity showed some complexes with positive results [104] and the mode of interaction studied [105]. The ability to inhibit motility does not, however, imply ability to stop reproduction. Indeed, a general problem with parasites is that, although bloodstream forms are more easily studied, the reproductive forms are intracellular. 

In the complex [Co(NH3)6]Cl3, the cation is [Co(NH3)6]3+, and it is named first. The coordinated ammonia molecules are named as ammine, with the number of them being indicated by the prefix hexa. Therefore, the name for the compound is hexaamminecobalt(III) chloride. There are no spaces in the name of the cation. [Co(NH3)5C1]C12 has five NH3 molecules and one CN coordinated to Co3+. Following the rules just listed leads to the name pentaamminechlorocobalt(III) chloride. Potassium hexacyanoferrate(III) is K3[Fe(CN)6j. Reinecke s salt, NH4[Cr(NCS)4(NH3)2], would be named as ammonium diamminetetrathiocyanatochro mate (III). In Magnus s green salt, [Pt(NH3)4][PtCl4], both cation and anion are complexes. The name of the complex is tetraammineplatinum(II) tetrachloroplatinate(II). The compound [Co(en)3](N03)3 is named as tris(ethylenediamine)cobalt(III) nitrate. 

Platinum dichloride dissolves in hydrochloric acid to form a dark brown complex acid, tetrachloroplatinic(ll) acid, H2PtCl4 in the solution ... 

Heretofore, the most common method for the preparation of the useful platinum(II) complexes of the type [PtCl2L3], where L is a tertiary phosphine, consisted of the reaction between potassium tetrachloroplatinate(II) and tertiary phosphines.1 When trialkylphosphines are used, the reaction usually leads to a mixture of cis- and trans isomers,2 3 and when triaiylphosphines are employed4 only the cis isomers are obtained. The preparation of pure trans complexes by a simple, convenient procedure is highly desirable. 

Potassium tetrachloroplatinate(II) reacts with allyl chloride in the presence of tin(II) chloride to give [PtCl(jr-C3H5)]4 (equation 279).858 The complex Pt(jr-C3H5)(PPh3)2 can be conveniently prepared by treating Pt(PPh3)3 with C3H5HgCl in benzene solvent at room temperature (equation 280).859... 

Figure 8.57 Supramolecular synthons 8.44 and 8.45 formed to halometallate complexes along with the tape structure formed by 4,4 bipyridinium tetrachloroplatinate(II) via an Rf (4) hydrogen bonded...

Chatt1 has prepared and investigated this complex and presented evidence to show that the butadiene acts as a bridging group between two PtCl3 units. The present preparation represents a slight modification of his procedure particularly with regard to the control of the acidity of the potassium tetrachloroplatinate(II) solution. 

When the reactions were carried out with two moles of arenetellurolate per mole of dipotassium tetrachloroplatinate, polymeric platinum complexes with arenetellurolate as the only ligand were obtained2. 

The parent ligands exhibit a rich, smectic pol5unorphism, but when modified with a fused cyclopentene ring, nematic phases dominate. Reaction of the ligands with tetrachloroplatinate(II) leads to poorly soluble, dimeric complexes that can be cleaved using dimethylsulfoxide the resulting monomeric complexes are then readily converted to the P-diketonate complexes. All of the complexes are mesomoiphic, and the P-diketonate complexes... 

NH4)2(PtCU), H2(PtCl6)] are responsible for this sensitivity. The bromide and iodide compounds are less effective. These platinum compounds form a platinum-protein conjugate that is the true allergen. Tetrachloroplatinates are mutagens. This seems to be true only of complex platinum salts. It does not apply to the complex salts of the other precious metals. Platinum amine nitrates and perchlorates either detonate when heated or are impact-sensitive. 

A full report on the c.d. of square-planar complexes formed between chiral olefins and sodium tetrachloroplatinate shows that a quadrant rule (Figure 6) predicts the sign of the Cotton effect near 440 nm for a range of disubstituted and some trisubstituted ethylenes. The Pt atom is considered to bond to the less-hindered face of the olefinic bond. Despite the success of the quadrant rule... 

Charge-transfer complexes of dissymmetric olefins with either tetracyano-ethylene or Pt (sodium tetrachloroplatinate) exhibit chiroptical effects related to the chirality of the olefin. TT)e Pt complexes generally obey a Quadrant Rule. Chiral olefins may also be converted into osmate esters, exhibiting Cotton effects in the region of 480 nm the sign obeys a chirality rule (Figure 3) which... 

Recently data have become available on the interaction between the cis-and trans-crotylammonium cations and the tetrachloroplatinate anion 8°). The cis-isomer forms the more stable complex, mainly due to a more favourable enthalpy change despite a small increase in the opposing entropy change, although the difference in the thermodynamic parameters for the two isomers... 

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