A facile route to hetero-bimetallic Ti(iv)-alkali metal calix[4]arene complexes
A facile route to hetero-bimetallic Ti(iv)-alkali metal calix[4]arene complexes
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DOI：
10.1039/b310635g
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发表时间：
2003-12-21
影响因子：
4
通讯作者：
Roberts, NK
中科院分区：
文献类型：
--
作者：
Petrella, AJ;Craig, DC;Roberts, NK
使用简单的台式程序，在甲醇中用碱金属对杯[4]芳烃进行去质子化，可有效形成新型单体和二聚钛（IV）配合物。对于较大的碱金属阳离子 K+ 和 Cs+，当乙酰丙酮配体抑制低聚物形成时，π-碱性杯[4]芳烃空腔内的有利络合有利于单体钛（IV）络合物的形成。相反，较小的Li+和Na+离子优先与外桥碱金属和钛(IV)金属中心形成二聚配合物。在不存在乙酰丙酮的情况下也获得了钾的二聚复合物。 K-Ti和Na-Ti杯[4]芳烃二聚体配合物的固态结构根据碱金属的性质表现出不同的结构特征。
Deprotonation of calix[4]arenes by alkali metal in methanol using simple benchtop procedures is effective in the formation of novel monomeric and dimeric titanium(IV) complexes. For the larger alkali metal cations, K+ and Cs+, favourable complexation within the pi-basic calix[4]arene cavity facilitates the formation of monomeric titanium(IV) complexes when oligomer formation is inhibited by an acetylacetonate ligand. In contrast, the smaller Li+ and Na+ ions preferentially form dimeric complexes with exo-bridging alkali and titanium(IV) metal centres. A dimeric complex is also obtained for potassium in the absence of acetylacetonate. The solid state structures of the K-Ti and Na-Ti calix[4]arene dimer complexes show different structural characteristics depending on the nature of the alkali metal.