Structures and Sorption Properties of Ionic Crystals of Macrocation-Dawson-Type Polyoxometalates with Different Charges
Structures and Sorption Properties of Ionic Crystals of Macrocation-Dawson-Type Polyoxometalates with Different Charges
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DOI：
10.1021/cm047879s
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发表时间：
2005-02
影响因子：
8.6
通讯作者：
S. Uchida;Ryosuke Kawamoto;T. Akatsuka;S. Hikichi;N. Mizuno
中科院分区：
文献类型：
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作者：
S. Uchida;Ryosuke Kawamoto;T. Akatsuka;S. Hikichi;N. Mizuno
Dawson型聚氧乙烯醚[α-P_2W_（18）O_（62）]_6 ~-、[α_2-P_2W_（17）V_（10）O_（62）]_7 ~-和[α-P_2W_（15）V_（30）O_（62）]_9 ~-与大阳离子的络合作用（[Cr 3 O（OOCH）6（H2O）3]+）形成离子晶体（NH 4）4[Cr 3 O（OOCH）6（H2O）3]2[α-P2 W18 O 62]·15 H2O（1a），（NH 4）5[Cr 3 O（OOCH）6（H2O）3]2[α2-P2 W17 V1 O 62]·15 H2O（2a），（NH_4）_7 [Cr_3O（OOCH）_6（H_2O）_3]_2 [α-P_2W_（15）V_3O_（62）]·15H_2O（3a）。化合物1a-3a显示出蜂窝状堆积，并且组成离子的对称性反映在晶体结构上。1a−3a的a轴长度几乎相同，而c轴的长度以1a ≥ 2a > 3a的顺序减小，随着多氧杂环丁烷酸盐的阴离子电荷的增加。1a-3a中的结晶水通过在373 K下抽真空而解吸，以形成相应的无客体相1b-3b。化合物1b−3b是晶体，1b−3b的a轴长度几乎相同，而c轴的长度以1b ≥ 2b > 3b的顺序减小。化合物1b−3b具有垂直于c轴的空隙。这...
The complexation of Dawson-type polyoxometalates of [α-P2W18O62]6-, [α2-P2W17V1O62]7-, and [α-P2W15V3O62]9- with the macrocation ([Cr3O(OOCH)6(H2O)3]+) forms ionic crystals of (NH4)4[Cr3O(OOCH)6(H2O)3]2[α-P2W18O62]·15H2O (1a), (NH4)5[Cr3O(OOCH)6(H2O)3]2[α2-P2W17V1O62]·15H2O (2a), and (NH4)7[Cr3O(OOCH)6(H2O)3]2[α-P2W15V3O62]·15H2O (3a), respectively. The compounds 1a−3a show the honeycomb packing and the symmetry of the constituent ions reflect on the crystal structures. The lengths of the a axes of 1a−3a are almost the same, while those of the c axes decrease in the order of 1a ≥ 2a > 3a, with the increase in the anion charges of the polyoxometalates. The water of crystallization in 1a−3a is desorbed by the evacuation at 373 K to form the respective guest-free phases 1b−3b. The compounds 1b−3b are crystalline, and the lengths of the a axes of 1b−3b are almost the same, while those of the c axes decrease in the order of 1b ≥ 2b > 3b. The compounds 1b−3b possess voids running perpendicular to the c axis. Th...