Stable five- and six-coordinated silicate anions in aqueous solution

被引:162
作者
Kinrade, SD
Del Nin, JW
Schach, AS
Sloan, TA
Wilson, KL
Knight, CTG
机构
[1] Lakehead Univ, Dept Chem, Thunder Bay, ON P7B 5E1, Canada
[2] Univ Illinois, Sch Chem Sci, Urbana, IL 61801 USA
关键词
D O I
10.1126/science.285.5433.1542
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Addition of aliphatic polyols to aqueous silicate solutions is shown to yield high concentrations of stable polyolate complexes containing five- or six-coordinated silicon. Coordinating polyols require at Least four hydroxy groups, two of which must be in three configuration, and coordinate to silicon via hydroxy oxygens at chain positions on either side of the threo pair. The remarkable ease by which these simple sugar-like molecules react to form hypervalent silicon complexes in aqueous solution supports a long-standing supposition that such species play a significant role in the biological uptake and transport of silicon and in mineral diagenesis.
引用
收藏
页码:1542 / 1545
页数:4
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