Host Materials Based on Metal Complexes with New Combination of Building Blocks

摘要

Host materials based on metal complexes are of great interest because of their high structural and functional diversities. To obtain unique and applicative metal complex hosts, we attempted new combination of building blocks, a divalent Cu(II) ion and a PF_(6)~(-) anion. A PF_(6)~(-) anion has been used as a noncoordinated anion in coordination chemistry due to its very weak Lewis basicity. However, a Cu(II) ion makes it possible to catch a variety of inorganic anions with weak Lewis-base properties at its axial sites using electrostatic interaction, resulting in the formation of Cu(II) complexes with weakly coordinated inorganic anions showing unprecedented host properties. In this accounts, we report (1) syntheses and crystallographic characterization of Cu(II) complex hosts with weakly-coordinated, fluorinated inorganic anions such as PF_(6)~(-), BF_(4)~(-), and CF_(3)SO_(3)~(-) at their axial sites, (2) a design and fabrication of flexible Cu(II) complex hosts using fluorinated inorganic anions, (3) selective adsorption of Lewis base guests utilizing latent Lewis acid properties, and (4) rational syntheses of monoanion-bridged Cu(II) complexes using an anion-mixing method.