Comparisons on isomeric 1,10-phenanthroline aromatic heterocyclic derivatives with triphenylamine and thiophene donors before and after rhenium(I) carbonyl complexation

298Comparisons between asymmetric and isomeric phen based compounds with 2-, 3- or 3,8-substituted TPA and thiophene donors and their respective tricarbonyl Re(I) complexes have been made on their 1H NMR and UV/Vis spectra, single-crystal structures and DFT calculations, where the alterations of conjugated system and steric hindrance before and after Re(I) ion complexation are responsible for the structural and spectral discrepancy.