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Synthesis, crystal structure and NMR of [Na(DB18C6)(CH3CN)] 3[alpha-AsM12O40] (M = Mo/W)
Two super-molecular complexes [Na(DB18C6)(CH3CN)] 3[alpha-AsM12O40] (M = Mo/W) were obtained by solvothermal reaction and characterized by IR,1H 13C and gUMBC NMR, X-ray. The result reveals that the complex consists of a [alpha-AsM12O40]3- (M = Mo/W) anion with alpha-Keggin structure, and three complex [Na (DB18C6)(CH3CN)] + cations in which every sodium ion is located in the cavity of dibenzo-18-crown-6 with 6 Na-O bonds and coordinated with one of the terminal O atom of [alpha-AsM12O40]3- (M = Mo/W) and the N atom of CH3CN from two sides of the distorted DB18C6 plane, respectively. The three terminal O atoms linked with sodium ion are from a single M3O13 (M = Mo/W) triplet of the alpha-Keggin metalatoarsenate anion, and M-Ob (M = Mo/W) bonds exhibit alternating single-double bond character.
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Chiral Catalysts,
Chiral catalysts – SlideShare