Abstract
Two new linear silver(I) nitrate coordination polymers with bitopic ligand 1,1,2,2-tetra(pyrazol-1-yl)ethane were synthesized. Synthesized compounds were characterized by IR spectroscopy, elemental analysis, powder X-ray diffraction and thermal analysis. Silver coordination polymers demonstrated a yellow emission near 500 nm upon excitation at 360 nm. Crystal structures of coordination polymers were determined and structural peculiarities are discussed. In both of the structures, silver ions are connected via bridging ligand molecules to form polymeric chains with a five-atomic environment. The coordination environment of the central atom corresponds to a distorted trigonal bipyramid with two N atoms of different ligands in apical positions. The Ag–N bond distances vary in a wide range of 2.31–2.62 Å, giving strongly distorted metallacycles. Thermolysis of coordination polymers in reductive atmosphere (H2/He) leads to the formation of silver nanoparticles with a narrow size distribution.
Highlights
Silver is one of the metal ions most commonly used for the construction of coordination polymers owing to its wide range of coordination numbers (2 to 7 [1]) and its ability to comply with ligand geometry [2,3,4,5]
Dehury and coworkers reported the synthesis and crystal structure of catalytically active binuclear palladium(II) complexes with Pz4 and similar ligands [24], but no silver coordination compounds with Pz4 have been reported
While the torsion angles C1–C1’–Nmn–Nmn in copper(II) complexes fall within the 61◦ –72◦ range, those in silver(I) compounds are lying in the range of 50◦ –58◦, which is in accordance with the increased ionic structures (Table 5)
Summary
Silver is one of the metal ions most commonly used for the construction of coordination polymers owing to its wide range of coordination numbers (2 to 7 [1]) and its ability to comply with ligand geometry [2,3,4,5]. The simplest possible bitopic ligand, -1,1,2,2-tetra(pyrazol-1-yl) ethane (Pz4 ), has not been examined so far as a building block for silver coordination polymers. We have prepared this ligand and have demonstrated its ability to form both discrete complexes and coordination polymers with copper(II) ions [21,22]. Dehury and coworkers reported the synthesis and crystal structure of catalytically active binuclear palladium(II) complexes with Pz4 and similar ligands [24], but no silver coordination compounds with Pz4 have been reported. We report the first synthesis and structural characterization of two new linear silver-Pz4. With Pz4 have been reported so far. We report the first synthesis and structural. Resultscharacterization and Discussion of two new linear silver-Pz4 coordination polymers
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