Rhenium - VII mixed ligand oxofluorooxalato complexes of quinquevalent rhenium

Chakravorti, M. C. ; Chaudhuri, M. K. (1973) Rhenium - VII mixed ligand oxofluorooxalato complexes of quinquevalent rhenium Journal of Inorganic and Nuclear Chemistry, 35 (3). pp. 949-955. ISSN 0022-1902

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002219...

Related URL: http://dx.doi.org/10.1016/0022-1902(73)80465-8


A binuclear mixed ligand fluorooxalato complex acid of quinquevalent rhenium with the stoichiometry Re : C2O4 : F = 2 : 1 : 2 has been isolated by boiling freshly precipitated rhenium dioxide with oxalic acid and 40 per cent HF. The sodium, potassium and ammonium salts have been obtained by reacting the acid with alkali acetates and precipitating with ethanol. The sparingly soluble Tl+, Ba2+, Ni2+, [Co(NH3)6]3+ and [Co en3]3+ salts have been isolated by metathesis. The i.r. spectra of the acid and its potassium salt resemble those of typical chelated oxalato complexes and are different from those of sodium oxalate or bridged oxalato complexes. The spectra give ν(O---H) and νas(Re---O---Re) bands. The acid and its sodium and potassium salts are weakly paramagnetic. The molecular weight and conductance of the potassium salt, i.r. spectra and analytical data indicate that the acid may be represented as H2[(C2O4)(OH)3Re.O.Re(OH)3F2].

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