Chakravorti, M. C. ; Chaudhuri, M. K. (1974) Rhenium-IX : mixed ligand oxofluoropyridine complexes of quinquevalent rhenium and salts of a new cation [ReO2py2(H2O)2]+ Journal of Inorganic and Nuclear Chemistry, 36 (4). pp. 757-761. 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(74)80807-9
Abstract
Two oxofluoropyridine complexes, viz. [ReO2py3F] and [ReO2py2F], have been obtained by heating [ReO2py4]F at 70° and 100°C respectively. Digestion of an acetone solution of [ReO2py4]F in the presence of dimethyl sulphate gave a precipitate of [ReO2py2(H2O)F]. Treatment of [ReO2py4]F with 40% HF gave the fluoride salt of a new complex cation of rhenium(V), viz. [ReO2py2(H2O)2]F. The chloride and the perchlorate salts of the cation have also been prepared. I.R. spectra of [ReO2py4]F, [ReO2py2F], [ReO2py2(H2O)2]Cl and [ReO2py2(H2O)2]ClO4 show the characteristics of coordinated pyridine and in addition a strong band at about 825 cm-1 which indicates the presence of trans O=Re=O grouping in the complexes. Log k for the equilibrium [ReO2py2(H2O)2]+ ⇔[ReO(OH)py2(H2O)2]+2, determined potentiometrically by Bjerrum's method is 1.9 at 30°C. The complexes [ReO2py4]F, [ReO2py2F], [ReO2py2(H2O)F], [ReO2py2(H2O)2]F and [ReO2py2(H2O)2]ClO4 were found to be very weakly paramagnetic, having the moments ranging from 0.28 to 0.61 B.M. at 303°K.
| Item Type: | Article |
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| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 23533 |
| Deposited On: | 25 Nov 2010 13:10 |
| Last Modified: | 30 May 2011 08:57 |
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