Silver-tetrapyridyl coordination polymers: [Ag2(L)](NO3)2(H2O)2, [Ag(L)](PF6), and [Ag2I2L](CH2Cl2) {L = 1,1,2,2-tetrakis(4-(pyridin-3-yl)phenyl)ethene}

Three silver coordination polymers, [Ag2(L)](NO3)2(H2O)2 (1), [Ag(L)](PF6) (2), and [Ag2I2L](CH2Cl2) (3), were prepared from AgX (X = NO3−, PF6−, I−) and a tetrakis(pyridine)-type linking ligand (L = 1,1,2,2-tetrakis(4-(pyridin-3-yl)phenyl)ethane). Polymers 1 and 2 are homoleptic coordination polymers, whereas polymer 3 is a mixed polymer. Polymer 3 exhibits a rather reversible desorption–resorption behavior of the guest CH2Cl2 molecules. Solid-state photoluminescence spectra of all polymers appear to display ligand-based fluorescence. Compared with the free ligand, polymer 1 exhibits a red shift, whereas polymers 2 and 3 exhibit a blue shift. The final structures and emission properties of the polymers may be attributed to the distinct coordination modes of the ligand and the anion in the starting silver compound.

Graphical abstractThree silver coordination polymers were prepared from a tetrakis(pyridine)-type ligand and silver halides or pseudohalides. Solid-state phosphorescence spectra of polymers appear to display ligand-based fluorescence.Figure optionsDownload full-size imageDownload as PowerPoint slide