Mechanochemical preparation of adducts (co-crystals and molecular salts) of 1, 4-diazabicyclo-2.2. 2-octane with aromatic polycarboxylic acids

Solid-state adducts (co-crystals and molecular salts) of 1,4-diazabicyclo-[2.2.2]-octane (DABCO) with aromatic polycarboxylic acids (isophthalic acid, isoH2, dinicotinic acid, dinH2 and dipicolinic acid, dipH2) were prepared in the solid state by grinding and kneading techniques, and fully characterized via X-ray diffraction. The polycarboxylic acids differ for the presence/absence and position of a nitrogen atom in the aromatic ring; the extent of proton transfer, from the carboxylic groups on the acids to the nitrogen atoms on DABCO, reflects the trend of solution acidity of the three polycarboxylic acids

Mechanochemical preparation of adducts (co-crystals and molecular salts) of 1, 4-diazabicyclo-2.2. 2-octane with aromatic polycarboxylic acids

Solid-state adducts (co-crystals and molecular salts) of 1,4-diazabicyclo-[2.2.2]-octane (DABCO) with aromatic polycarboxylic acids (isophthalic acid, isoH2, dinicotinic acid, dinH2 and dipicolinic acid, dipH2) were prepared in the solid state by grinding and kneading techniques, and fully characterized via X-ray diffraction. The polycarboxylic acids differ for the presence/absence and position of a nitrogen atom in the aromatic ring; the extent of proton transfer, from the carboxylic groups on the acids to the nitrogen atoms on DABCO, reflects the trend of solution acidity of the three polycarboxylic acids

Argentophilic Infinite Chain, Column, and Layer Structures Assembled with the Multinuclear Silver(I)–Phenylethynide Supramolecular Synthon

Nine silver­(I) complexes bearing the phenylethynide ligand and different ancillary anions, namely, double salts AgCCPh·AgNO₃ (<b>1</b>), 2AgCCPh·AgNO₃ (<b>2</b>), [Ag₅(CCPh)₄(DMSO)₂]­X [X = BF₄ (<b>3A</b>), ClO₄ (<b>3B</b>), PF₆ (<b>3C</b>), AsF₆ (<b>3D</b>), SbF₆ (<b>3E</b>)], 2AgCCPh·5AgO₂CCF₃·4DMSO (<b>4</b>), and a triple salt 10AgCCPh·2AgOTf·AgNO₃·3DMSO (<b>5</b>), have been synthesized and shown to possess coordination frameworks that are assembled with the supramolecular synthon Ph–CC⊃Ag_<i>n</i> (<i>n</i> = 3, 4, 5). Different argentophilic layers are found in nitrate complexes <b>1</b> and <b>2</b>, which are crystallized from water and mixed water/DMSO, respectively. Difficulty was encountered in growing quality crystals of complexes <b>3A</b>–<b>3E</b>,<b> 4</b>, and <b>5</b> bearing weakly coordinating anions, but DMSO proved to be a good solvent for crystallization by functioning as a coligand. The isostructural compounds <b>3A</b>–<b>3E</b> exhibit the same type of pseudohexagonal packing of infinite silver columns, with the ancillary anionic component filling the intervening space and linking adjacent columns via weak hydrogen bonds. Three-dimensional supramolecular frameworks based on similar packing of silver chains and columns, respectively, are found in double salt <b>4</b> and triple salt <b>5</b>