ジルコニウム(IV)/ ハフニウム(IV) を含有するサンドイッチ型ポリ酸塩の合成、構造と性質

概要

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Six types of novel zirconium(IV)/hafnium(IV) cluster cations sandwiched between two lacunary species of Keggin- and/or Dawson-type polyoxometalates (POMs) have been synthesized and unequivocally characterized, i.e., [M(a-PW11O39)2]10- (M = ZrIV (K-Zr1), M = HfIV (K-Hf1)), [{a-PW11O39M(m-OH)(H2O)}2]8- (M = ZrIV (K-Zr2), M = HfIV (K-Hf2)), [M(a2-P2W17O61)]16- (M = ZrIV (D-Zr1), M = HfIV (D-Hf1)), [{a2-P2W17O61M(m-OH)(H2O)}2]14- (M = ZrIV (D-Zr2), M = HfIV (D-Hf2)), [M3(m-OH)3(A-a-PW9O34)2]9- (M =ZrIV (K-Zr3), M = HfIV (K-Hf3)), and [Hf4(m3-O)2(m-OH)2(H2O)4(P2W16O59)2]14- (D-Hf4). [Note: in the abbreviation of the compounds the symbols of K- and D- stand for Keggin- and Dawson-type, respectively, and the symbols of Zrn and Hfn (n = 1-4) stand for the number of zirconium and hafnium nuclei in the sandwiched clusters,respectively.] Herein, their syntheses, molecular structures and behaviors in solution are described.
2009-10-20