Syntheses, structures and photoluminescence of a series of coordination frameworks based on dicarboxylate anion and bis(imidazole) ligand

Synthesis of Bis-imidazole Derivatives from 2,6-bis(4-formylbenzylidiene)-Cycloalkanones

2,5-Bis(4-(4,5-bis(4-aryl)-1 H-imidazol-2-yl)benzylidene)-cycloalkanones were synthesised by reacting 4,4′-(2-oxocycloalkane-1,3-diylidene) bis(methan-1-yl-1-ylidene) dibenzaldehydes, resulting from aldol condensation of terephthalaldehyde and cycloalkanones, with benzil and ammonium acetate. The structures of the products were then identified by FTIR, 1H NMR, 13C NMR and elemental analysis. The reaction conditions were optimised by varying the type and amount of catalyst, and temperature. The key advantages of this process are simple procedure, environmentally friendly conditions and good yield of products.

Two photoluminescent silver(I) saccharinate complexes: The formation of a potassium-oxygen cluster, and Ag ··· π and (O—H) ··· Ag interactions

Two new Ag(I)-saccharinate complexes, K[Ag(sac)2] · H2O (1) and [Ag(sac)(ina)] · 1.5 H2O (2) (sac = saccharinate and ina = isonicotinamide), have been synthesized and characterized by elemental analyses, IR spectroscopy, thermal analysis and single crystal X-ray diffraction. The silver atoms adopt a linear AgN2 geometry in each case defined by two sac ligands in 1, and one sac and one ina ligand in 2. In 1, the anionic complex units are linked into a two-dimensional array by two potassium atoms, forming an eight-membered bimetallic ring and a K2O10 potassium−oxygen cluster. Complex 2 shows rare (O—H) ··· Ag and (N—H) ··· Ag interactions. The molecules are connected by Ag ··· Csac (η3) interactions involväing the saccharinate-phenyl rings.