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The hydrothermal reaction of Lindqvist [Nb 6 O 19 ] 8− , sodium pyrophosphate with transition metal ion (Co II ) in the presence of amine results in one novel transition-metal-linked trivacant Keggin heteropolyniobate: K 6 Na 17 [H 3 {Co(H 2 O) 3 } 2 (P 4 Nb 9 O 40 ) 2 ]·24H 2 O. The compound has been structurally characterized by EDS, IR spectra, XPS, thermogravimatric analysis, and X-ray crystallography...
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