Structural variation in silver(I) complexes with pyridazine ligand and aromatic polycarboxylic acids: Structural analysis with silver chains

• The silver clusters of 1 are comprised by two distorted tetrahedron silver units to form silver chains.
• The silver chains of 2 are formed by the Ag4 units and the four Ag(I) are in the vertices of parallelogram.
• Photoluminescent spectra of four complexes reveal the relationship between free ligands and complexes.

To systematically explore the influence of pyridazine ligands and aromatic polycarboxylate on the existence of argentophilicity, four inorganic–organic hybrid Ag(I) complexes were obtained by one-pot ultrasonic reaction. Four complexes were named [Ag6(pdz)2(btc)2]n (1), [Ag2(pdz)(npt)]n (2), [Ag2(pdz)(pma)1/2]n (3), and [Ag2(pdz)(npa)·H2O]n (4) (pdz = pyridazine, H3btc = 1,3,5-benzene tricarboxylic, H2npt = 3-nitrophthalic acid, H4pma = pyromellitic acid, H2npa = 1,4-naphthalenedicarboxylic acid). Structural analyses reveal that complexes 1–4 display diverse 2D or 3D frameworks, which all of the N-donor pdz ligands exhibit the same coordination mode but the distances of the silver atoms which link to the pdz ligands are different to each other. Complex 1 shows Ag6 clusters and the cluster is comprised by two distorted tetrahedron silver units. And the clusters are shared by two silver ions to form 1D silver chains. Complex 2 features 1D silver chains which are formed by the Ag4 units and the four Ag(I) ions are in the vertices of parallelogram. Complex 3 is an interpenetrating architecture with the pdz ligands alternately repeating up and down in ac plane. The structure of complex 4 is a 2D layer structure which the pdz and npt ligands alternately repeat along a axis. Moreover, complexes 1–4 indicate different photoluminescence behaviors in the solid state.

Four complexes were synthesis based on the pdz ligand as below. The effects of organic coligands in the formation of different structures were discussed in the paper.Figure optionsDownload as PowerPoint slide