ポリ酸塩の欠損部位を新しい化学反応空間に利用したポリ酸塩ベースの触媒設計

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■短報■ 2007 年度神奈川大学総合理学研究所共同研究助成論文Three olefin-containing organosilyl derivatives supported on the mono-lacunaryDawson polyoxometalate (POM), [α2-P2W17O61{(RSi)2O}]6– (R = {CH2=C(CH3)COO(CH2)3}; 1,{CH2=CHCOO(CH2)3}; 2 and {CH2=CH}; 3), as Me2NH2 salts, which can act as precursors forthe immobilization of the POMs in polymer networks, were obtained by the 2:1 molar ratioreaction of the organosilyl precursor RSi(OCH3)3 with K10[α2-P2W17O61]·19H2O in acidicMeOH/H2O mixed solutions. These compounds were unequivocally characterized withcomplete elemental analysis, TG/DTA, FT-IR, solution (1H, 13C, 29Si, 31P, and 183W) NMR,and X-ray crystallography. X-ray crystallography revealed that the two organic chainsconnected through an -Si-O-Si- bond were grafted onto the mono-lacunary site of the POM.The four-coordination of each Si atom was attained with the bridging oxygen atom, theterminal organic group R in the organosilyl group, and two of the four oxygen atoms in themono-lacunary site of the POM. In the solid-state, two POMs (1, 3) were represented as C1symmetry, on the other hand, 2 could be depicted as an approximate Cs symmetry. In thesolution, all POMs were represented as Cs symmetry owing to mobility of the organicchains.
神奈川大学の論文