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A New Class of Oligonuclear Platinum-Thallium Compounds with a Direct Metal−Metal Bond - 3. Unusual Equilibria in Aqueous Solution

✍ Scribed by Mikhail Maliarik; Julius Glaser; Imre Tóth; Mateus Webba da Silva; László Zékány

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
425 KB
Volume
1998
Category
Article
ISSN
1434-1948

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✦ Synopsis

A new series of four binuclear platinum-thallium cyano compounds containing a direct and unsupported by ligands met-alϪmetal bond has been prepared in aqueous solution. These compounds are represented by the formula [(NC) 5 PtϪTl(CN) nϪ1 ] (nϪ1)Ϫ (n = 1Ϫ4 for compounds I, II, III IV, respectively) and [(NC) 5 PtϪTlϪPt(CN) 5 ] 3Ϫ (for compound V). The oligonuclear complexes are synthesised according to the reaction mPt(CN) 4 2Ϫ + Tl 3+ + nCN Ϫ v [Pt m Tl-(CN) 4m+n ] 3Ϫ2mϪn . Thus, there occurs a change of the coordination number of the Pt center from four (square planar) to six (octahedral). Consequently, the formation of binuclear platinum-thallium cyano compounds involves at least two steps: (i) formation of metalϪmetal bond and (ii) formation of (NC) 5 PtϪ unit by a cyanide transfer process. Ϫ The comple-

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