摘要 :
The first uninodal 10-connected metal-organic framework, based on pentanuclear cadmium cluster building blocks, exhibits an unprecedented γ-Pu topology, which adds a new member to the series of metal-organic analogues which have ...
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The first uninodal 10-connected metal-organic framework, based on pentanuclear cadmium cluster building blocks, exhibits an unprecedented γ-Pu topology, which adds a new member to the series of metal-organic analogues which have a natural materials topology.
Current interest in coordination polymer frameworks not only stems from their potential applications in microelectronics, nonlinear optics, porous materials, and catalysis, but also from their intriguing variety of molecular architectures and topologies. An important subject within this area is the study and analysis of network topology, which is not only a powerful tool for simplifying the structure of complicated compounds but also plays an instructive role in the rational design of certain functional materials with desirable properties. To date, network topologies in coordination polymers have been discussed in several notable reviews following a seminal compilation by Wells decades ago. The analysis of data for existing materials reveals that the nets with high frequency are topologically symmetrical and, in particular, have small numbers of types of nodes and edges, such as 3-connected srs, 4-connected dia, 6-connected pcu, and 8-connncted bcu nets. Compared to these commonly encountered 3-8-conneted topologies, the development of higher connectivity nets (> 8), neither with high-symmetry nor low-symmetry structures, is still in its early stages, which can be attributed, at least partially, to the limited coordination numbers of single metal centers and steric hindrance of the most commonly used organic ligands. To our knowledge, no uninodal 10- or 11- connected nets have been found in coordination network chemistry before this work, although 9- and 12-connected examples have been sporadically reported more recently.5 Not only do we lack knowledge for the construction of such unusual nodal geometries, but it is also necessary to build real crystal structures based on these nodes so as to find topological relations between them and related three-periodic nets.
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