The pH dependent nuclearity variation of {Mo154-x}-type polyoxomolybdates and tectonic effect on their aggregations

The pH dependent nuclearity variation of {Mo154-x}-type polyoxomolybdates and tectonic effect on their aggregations
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DOI:
10.1021/ja800784a
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发表时间:
2008-08-13
影响因子:
15
通讯作者:
Ozeki, Tomoji
Ozeki, Tomoji
中科院分区:
化学1区
文献类型:
--
作者:
Shishido, Sayaka;Ozeki, Tomoji

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用同步辐射X射线衍射方法研究了混合价氧钼酸盐巨团簇{Mo_(154-x)}的结构与pH的关系,其中[Mo_(138)O_(410)(OH)(20)(OH_2)(46)](40-)(1),[Mo_(138)O_(410)(OH)(20)(OH_2)(38)](40-)(2),[Mo138O406(OH)(16)(OH2)(46)](28-)(3),[Mo142O400(OH)(52)(OH2)(38)](28-)(4),[Mo142O432(OH2)(58)](41-)(5),[Mo148O436(OH)(15)(OH2)(56)](27-)(6),[Mo 150 O 451(OH)(5)(OH 2)(61)](35-)(7),以及[Mo150O442.5(OH)(11.5)(OH 2)(64)](24.5-)和[Mo 152 O 446(OH)(20)(OH 2)(54)](28-)(8)。晶体1、4和5包含离散的簇,而簇间Mo-O-Mo键将簇连接成晶体7中的链,晶体2和3中的二维网络,以及晶体6中的三维骨架结构。晶体8包含离散的和线性连锁的簇:离散的{MO 150}位于{Mo-152}链之间,观察到簇的核度与母液的pH值之间存在直接相关性。另一方面,扩展结构的几何形状没有表现出明显的相关性与pH值。他们原来是受构造的组成集群。母液的pH通过组成簇的结构对扩展结构施加影响。
The pH dependence of the structures of {Mo154-x} mixed-valence oxomolybdate giant clusters were investigated by synchrotron X-ray diffraction of systematically prepared crystals containing [Mo138O410(OH)(20)(OH2)(46)](40-) (1), [Mo138O410(OH)(20)(OH2)(38)](40-) (2), [Mo138O406(OH)(16)(OH2)(46)](28-) (3), [Mo142O400(OH)(52)(OH2)(38)](28-) (4), [Mo142O432(OH2)(58)](41-) (5), [Mo148O436(OH)(15)(OH2)(56)](27-) (6), [MO150O451(OH)(5)(OH2)(61)](35-) (7), and both [Mo150O442.5(OH)(11.5)(OH2)(64)](24.5-) and [Mo152O446(OH)(20)(OH2)(54)](28-) (8). Crystals 1, 4, and 5 contain discrete clusters while intercluster Mo-O-Mo bonds connect the clusters into chains in crystal 7, into two-dimensional networks in crystals 2 and 3, and into a three-dimensional framework structure in crystal 6. Crystal 8 contains both discrete and linearly catenated clusters: discrete {MO150} are located between the chains of {Mo-152} Direct correlation was observed between the nuclearity of the clusters with the pH of the mother liquor. On the other hand, the geometries of extended structures do not show apparent correlation with the pH. They turned out to be governed by the tectonics of the component clusters. The pH of the mother liquor exerts influence on the extended structure through the structures of the constituent clusters.