Self-assembling coordination complexes from suitable ligands and metal ions are of current interest to chemists. Among many ligands designed, dipyrrins 1 were recently found to be ideal building blocks for supramolecular assemblies.'.'Dipyrrins I, formerly called dipyrromethenes, are yellow colored, fully conjugated flat molecules containing 10 rc- electrons, which are important building blocks for porphyrins, bile pigments, and linear ...