首页> 外文期刊>New Journal of Chemistry >Polyoxoanions assembled by the condensation of vanadate, tungstate and selenite: solution studies and crystal structures of the mixed metal derivatives (NMe4)(2)Na-2[(W4V2O19)-V-VI-O-V]center dot 8H2O and (NMe4)(4.83)[Se(IV)W(VI)4.57V(V)4.43O(33))(2)(W-VI(O)(H2O)((VO)-O-V)(2.6)]center dot 1057H(2)O
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Polyoxoanions assembled by the condensation of vanadate, tungstate and selenite: solution studies and crystal structures of the mixed metal derivatives (NMe4)(2)Na-2[(W4V2O19)-V-VI-O-V]center dot 8H2O and (NMe4)(4.83)[Se(IV)W(VI)4.57V(V)4.43O(33))(2)(W-VI(O)(H2O)((VO)-O-V)(2.6)]center dot 1057H(2)O

机译:钒酸根,钨酸根和亚硒酸根缩合形成的聚氧阴离子:混合金属衍生物(NMe4)(2)Na-2 [(W4V2O19)-V-VI-OV]中心点8H2O和(NMe4)(的溶液研究和晶体结构) 4.83)[Se(IV)W(VI)4.57V(V)4.43O(33))(2)(W-VI(O)(H2O)((VO)-OV)(2.6)]中心点1057H( 2)O

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摘要

The reaction of acidified aqueous solutions of Na2WO4, NaVO3 and SeO2 in a 16 :4: 3 molar ratio gives a complex mixture of polyoxometalates (POMs) with both W-V1 and V-v addenda, formulated as [((SeWxV9-xO33)-W-IV-V-VI-O-v)(2)((WO)-O-VI(H2O)(VO)(m)](n-) with x = 4, 5, 6; m = 2 or 3. In solution, the sandwich-type complexes [((SeWxV9-xO33)-W-IV-V-VI-O-V)(2)((WO)-O-VI(H2O))(VO)(m)](n-) slowly lose Se and convert into [W(VI)4V(V)2O(19)](4-) and further to [W(VI)5V(V)O(19)](3-) with a Lindqvist-type structure. These transformations were monitored with V-51 and Se-77 NMR, electrospray mass-spectrometry and capillary electrophoresis. Crystals of (NMe4)2Na(2)[(W4V2)O-19]circle 8H(2)O (1) and (NMe4)(4.83)[(SeW4.57V4.43O33)(2)(W(O)(H2O))(VO)(2.6)]center dot 10.57H(2)O (2) were isolated and structurally characterized.
机译:Na2WO4,NaVO3和SeO2的酸化水溶液以16:4:3的摩尔比进行反应,得到了多金属氧酸盐(POM)与W-V1和Vv附加物的复杂混合物,配制成[[((SeWxV9-xO33)-W -IV-V-VI-Ov)(2)((WO)-O-VI(H2O)(VO)(m)](n-),x = 4、5、6; m = 2或3。溶液,夹心型络合物[((SeWxV9-xO33)-W-IV-V-VI-OV)(2)((WO)-O-VI(H2O))(VO)(m)] [n- )慢慢失去Se,然后用Lindqvist将其转换为[W(VI)4V(V)2O(19)](4-),然后进一步转换为[W(VI)5V(V)O(19)](3-)-通过V-51和Se-77 NMR,电喷雾质谱和毛细管电泳监测这些转变。(NMe4)2Na(2)[(W4V2)O-19]圆8H(2)O(1 )和(NMe4)(4.83)[(SeW4.57V4.43O33)(2)(W(O)(H2O))(VO)(2.6)]中心点10.57H(2)O(2)的分离和结构表征。

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