A new synthetic route to Lindqvist type clusters [(n-Bu4N)(x)][M ' M5O19] [when x=2, M ' = M = Mo or W; x=3, M ' = Mo, M = W] from metal carbonyl precursors [(CO)(5)ML] [M = Mo, W; L = CO, C(OMe)(Me)]

作者：Thakur Arunabha; Chakraborty Amarnath; Ramkumar V; Ghosh Sundargopal^*

来源：Dalton Transactions, 2009, (36): 7552-7558.

DOI：10.1039/b908348k

Two fully oxidized [(n-Bu4N)(2)][Mo6O19], 7 and [(n-Bu4N)(2)][W6O19], 8 and one mixed-metal, mixed-valence one electron reduced [(n-Bu4N)(3)][MoW5O19], 9 cluster have been synthesized under biphasic reaction conditions from group VI metal carbonyls or Fischer carbene complexes, [(CO)(5)M=C(OMe)Me] (M = Mo, W) in yields of 73, 77 and 71% respectively. All the clusters have been characterized by IR, H-1 and C-13 NMR spectra, and crystal structure determinations. Additionally, the composition of 9 has also been supported by mass spectrometry (MALDI-TOF), inductively coupled plasma (ICP) and energy-dispersive X-ray (EDX) analysis. This novel and mild route offers distinct improvements over earlier methods of synthesis for Lindqvist type mixed-valence mixed-metal polyoxometalate cluster.

• 出版日期2009