Supramolecular architecture: 'Formation and characterization of multi-porphyrin arrays'

The beauty of micro- and nanoscopic words relies on the marriage of chemistry and symmetry. Our contribution to nanoscopic materials has been the formation of multiporphyrin square arrays and tapes by both coordination chemistry and H-bonding.; Meso pyridyl porphyrins and cis-Pt(II) or trans-Pd(II) complexes have been utilized for the formation of the metal mediated square arrays and tapes. Linear tapes were formed by interaction of 180° coordinating dipyridyl porphyrin and the terminal monopyridyl porphyrin to trans-Pd(II) complex. The more rigid planar tapes were derived from a solution of 90° coordinating (L-shaped) dipyridyl porphyrin and the X-shaped tetrapyridyl porphyrin upon addition of the cis-Pt(II) complex The more complicated square array was derived from the stoichiometrically “correct” mixture of X, T, and L-coordinating (tetrapyridyl, tripyridyl and cis-dipyridyl) porphyrins upon the addition of the trans-Pd(II) complex. The last array consists of 9 porphyrins and 12 Pd atoms that come together to form a 5 x 5 nm2 array.; Similar square and tapes were the desired supramolecular structures for our hydrogen-bonded multiporphyrins arrays. The shape and organization was directed by hydrogen bonding between the 3,5-diacetoamido-4′ -pyridyl and 1-butyluracyl patterns at the meso positions of the porphyrins.*; *Please refer to dissertation for diagram.