Effect of solvent inclusion on the structures and solid-state fluorescence of coordination compounds of naphthalimide derivatives and metal halides

The structural characteristics and solid-state fluorescence of coordination compounds formed between the fluorophore N-((3-pyridyl)methyl)-1,8-naphthalimide (3-pn) and a range of divalent metal halides, were investigated. Six new crystal structures, of the formula ML 2 X 2.solv, were obtained through the combination of the organic ligand L = 3-pn with the divalent metal halides CoX2 (X = Cl− or Br−) or ZnX2 (X = Cl− or Br−) in different solvents. It was found that solvent molecules are incorporated into all the structures, and that the same complex can incorporate different solvent molecules. The conformation of the complex molecule is determined by the solvent molecule incorporated into the structure. The fluorescence intensity is affected by the identity of the metal and halido ligand in the complex molecule, while the identity of the solvent molecule and the metal ion affects the emission wavelength. Thus, the solvent of crystallisation impacts on the solid-state fluorescence of the compounds, hence the same complex can be made to fluoresce at different wavelengths depending on the solvent of crystallisation.

Hierarchical self-assembly of a fluorescence emission-enhanced organogelator and its multiple stimuli-responsive behaviors

A discrete hexagonal metallacycle 1 decorated with tetraphenylethylene, amide groups and long hydrophobic alkyl chains was constructed via [3 + 3] coordination-driven self-assembly, from which the fluorescence emission-enhanced organogelator with multiple stimuli-responsiveness was successfully prepared via hierarchical self-assembly.

Tetrahalometallate salts of N-(4-picolinium)-1,8-naphthalimide: structures and solid-state fluorescence

The fluorescence behaviour and non-covalent aromatic- and hydrogen bonding interactions in a family of N-(4-picolinium)-1,8-naphthalimide tetrahalometallates are reported.