Abstract
[2.2]Paracyclophane scaffolds have seen limited use as building blocks in supramolecular chemistry. Here, we report the synthesis and characterization of a 1D coordination polymer consisting of silver(I) ions bound to a [2.2]paracyclophane scaffold functionalized with two 4-pyridyl units. The structure of the polymer has been determined from single crystal X-ray diffraction analysis and reveals two different silver coordination motifs that alternate along the 1D coordination polymer. The coordination polymer exhibits strong blue and sky-blue fluorescence in solution and in the crystalline solid state, respectively.
Highlights
Coordination polymers are polymeric arrays of monomeric units that are held together through metal coordination (Yang et al, 2015)
Among the metals used to synthesize coordination polymers, silver is of particular interest due to the range of geometries and coordination modes available (Young and Hanton, 2008)
The same observation was made by Huo and coworkers (Huo et al, 2016) who reported a series of luminescent Ag(I) coordination polymers with different coordination modes tuned via different multidentate bis(1,2,3-triazole) ligands and anions
Summary
Coordination polymers are polymeric arrays of monomeric units that are held together through metal coordination (Yang et al, 2015). Liu and coworkers (Liu et al, 2005) reported 2D networks with metallocyclophane motifs with high electric conductivity due to columnar aromatic stacking motifs formed through both intra- and intermolecular π−π interactions They report a 2D zigzag sheet structure, in which silver triflate forms tubelike double chains with 4,4′-bis (2,5dimethylstyryl) biphenyl molecules acting as links between the chains to form the sheets. Both of those compounds exhibit luminescence in the solid state and show excitation and emission maxima are shifted to longer wavelength as compared to those of the corresponding metal-free ligands. The coordination polymer Ag-pCp was obtained from the reaction of Ag(I) ions and a [2.2] paracyclophane functionalized at the 7 and 15-positions with 4-pyridyl moieties (pCpd4py)
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