The combination of cooperative hydrogen bonding and ion pairing between cationic iron (II)
terpyridines and anionic porphyrins yielded remarkably stable neutral complexes even in
the highly competitive solvent DMSO. Isothermal titration calorimetry (ITC) was used to
compare association constants, enthalpies and entropies of binding between various
combinations of the two molecular components that make up the complexes. Steady-state
luminescence studies highlighted that, as expected, the fluorescence quenching of the …