Assembly of three-dimensional networks based upon silver–ethynide complexes bearing pyridyl and carboxylate groups?

Dalton Transactions Pub Date: 2012-12-17 DOI: 10.1039/C2DT32030D

Abstract

Two ligands with different geometries have been prepared to synthesize new silver–ethynide complexes bearing pyridyl and carboxylate groups. Reactions of 5-ethynylnicotinic acid (H222L1) and 5-ethynylpicolinic acid (H222L2) with silver nitrate afforded [Ag2(L1)·AgNO3]n (1) and {[Ag12(L2)6·12AgNO3]·5H2O}n (2), respectively. Crystallographic studies revealed that in 1, the L1 ligands connect linear silver chains to form a 2D layer through silver-ethynide interactions and Ag-carboxylate coordination bonds, and subsequently the layers are further linked through Ag–N(pyridyl) coordination bonds to generate a 3D network; however in 2, the L2 ligand interacts with Ag8 units through Ag–N, Ag–O coordination bonds, silver–ethynide interactions and π–π stacking directly to assemble a 3D network. In the solid state, both complexes are luminescent at room temperature, assigned as the intraligand n–π* and π–π* transitions.

Graphical abstract: Assembly of three-dimensional networks based upon silver–ethynide complexes bearing pyridyl and carboxylate groups
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