On the Structure of Layered Double Hydroxides Intercalated with Titanium Tartrate Complex for Catalytic Asymmetric Sulfoxidation
On the Structure of Layered Double Hydroxides Intercalated with Titanium Tartrate Complex for Catalytic Asymmetric Sulfoxidation
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DOI：
10.1021/jp106931g
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发表时间：
2010-09
影响因子：
3.7
通讯作者：
Huimin Shi;Chenguang Yu;Jing He
中科院分区：
文献类型：
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作者：
Huimin Shi;Chenguang Yu;Jing He
以CO 32 − LDHs为前驱体，通过离子交换法将酒石酸钛复合物插层到M Ⅱ/Al层状双氢氧化物（MII = Mg 2+，Zn 2+，Co2+）的孔道中。结果表明，插层对钛中心的配位数几乎没有影响，但对平均Ti···O间距和八面体对称性有微小的影响.配位阴离子通过疏水相互作用排列在层间廊道中，配位羧酸根指向水镁石样层，烷氧基邻近另一个络合物中的等价物。通过调节类水镁石层单元的电荷密度和层间Ti（IV）TA 2阴离子的电荷占有率来调控层间酒石酸钛配合物的排列。在热处理过程中，直到573 K，插层结构才发生坍塌.作为主体的类水镁石层的组成对层间化合物的双层排列几乎没有影响。
Titanium tartrate complex has been intercalated within the gallery spaces of MΠ/Al layered double hydroxides (LDHs) (MII = Mg2+, Zn2+, Co2+) by ion exchange using CO32− LDHs as precursors. It is found that the intercalation hardly influences the coordination number of the titanium center while making tiny perturbation on the average Ti···O distances and octahedral symmetry. The complex anions are arranged in the interlayer gallery in an interdigitated bilayer with the coordinated carboxylates pointing to the brucite-like layer and the alkoxy group adjacent to the equivalent in another complex through hydrophobic interaction. The arrangement of interlayer titanium tartrate complex has been modulated by adjusting the charge density of unit brucite-like layer and the charge occupancy of the interlayer Ti(IV)TA2 anions. The intercalated structure is not collapsed until 573 K in the thermal treatment. The composition of the brucite-like layer as host hardly influences the bilayer arrangement of interlayer comp...