Three-Dimensional Coordination Polymer of Silver(I) with Bridging Ligand Hexakis(4-pyridyl)[3]radialene

This paper describes the synthesis of hexakis(4-pyridyl)[3]radialene and the crystal structures of its complexes. Due to their
structural diversity and fascinating properties, coordination polymers have attracted considerable attention. From the standpoint of crystal
engineering, the title compound will be regarded as a useful tecton since the pyridyl groups are attached to the [3]radialene core. The title
compound formed a complex with two molecules of resorcinol. In this complex, the double hydrogen bonding between the title compound
and resorcinol is observed. Deformation of the title compound is observed because of the binding of resorcinol molecules. A silver(I)
complex of the title compound was also obtained as reddish crystals. Notably, the crystal structure of the silver(I) complex features a
three-dimensional coordination polymer. The composition of the crystal is 1:1 with respect to the title compound and silver(I) atoms including
the solvent molecules of one DMSO and one methanol. Four of the six nitrogen atoms are coordinated to the silver(I) atom and the other
two pyridyl groups are free from coordination. The coordination geometry of the silver(I) atom is distorted tetrahedral. To the best of our
knowledge, this is the first example of a three-dimensional coordination polymer of a [3]radialene-based bridging ligand.