In our previous article (Dalton Trans. 2008, 6692-6698) we reported that hydrothermal reaction of a mono-lacunary Keggin-type silicotungstate, [SiW11O39]8-, and Ru(acac)3 (acac: acetylacetonate) for 5-24 h produced a mono-Ru-substituted Keggin-type silicotungstate with a terminal aqua ligand, [SiW11O39RuIII(H2O)]5-, which was further converted into a carbonyl (CO) derivative, [SiW11O39RuII(CO)]6-, by increasing the reaction time for several days. Here, reactions of Ru(acac)3 with other mono-lacunary heteropolytungstates for the formation of other mono-Ru(CO)-substituted heteropolytungstates, including Keggin derivatives, [GeW11O39RuII(CO)]6- and [PW11O39RuII(CO)]5-, and Dawson-type phosphotungstates, [α1-P2W17O61RuII(CO)]8- and [α2-P2W17O61RuII(CO)]8-, are presented. The desired α2-isomer of Dawson-type phosphotungstate, [α2-P2W17O61RuII(CO)]8-, was produced in high purity and was fully characterized by CV, 31P NMR, 13C NMR, IR, UV/Vis, elemental analysis, mass spectroscopy, TG-DTA, TPD-MS, and single-crystal structure analysis. On the other hand, Keggin-type complexes, [GeW11O39RuII(CO)]6- and [PW11O39RuII(CO)]5-, were formed together with their aqua derivatives, [GeW11O39RuIII(H2O)]5- and [PW11O39RuIII(H2O)]4-, respectively, and the α1-isomer of Dawson-type phosphotungstate, [α1-P2W17O61RuII(CO)]8-, was produced together with the α2-derivative, as confirmed by CV, IR, mass spectroscopy, and 31P NMR spectroscopy.
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