Rhenium-VI : mixed ligand oxofluorocyano complexes of quinquevalent rhenium

Chakravorti, M. C. ; Chaudhuri, M. K. (1972) Rhenium-VI : mixed ligand oxofluorocyano complexes of quinquevalent rhenium Journal of Inorganic and Nuclear Chemistry, 34 (11). pp. 3479-3484. ISSN 0022-1902

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Related URL: http://dx.doi.org/10.1016/0022-1902(72)80244-6


A mixed ligand oxofluorocyano complex of quinquevalent rhenium, viz. H[ReOF(H2O)-(CN)3] has been prepared by boiling K3[ReO2(CN)4] with 40% hydrofluoric acid. Sodium, potassium and ammonium salts, M1[ReOF(H2O)(CN)3] have been obtained by neutralising the acid with the corresponding alkali acetates and then precipitating with ethanol. Tl+, Ni2+, [Co(NH3)6]3+ and [Coen3]3+ salts have been prepared by precipitating the acid with the salts of these ions. The acid loses half a molecule of hydrogen fluoride at 110°C and forms the dinuclear acid H[Re2O2F(H2O)2(CN)6]. The potassium salt of this acid has been prepared by neutralising with caustic potash and precipitating with ethanol. The mononuclear acid is very weakly paramagnetic. The dissociation constant determined by Bjerrum's method is pKa = 3.3 at 30°CC. The i.r. spectra of the acid and of its potassium salt have been reported.

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