Gregory R. Baker

Self- and Directed Assembly of Hexaruthenium Macrocycles

Rigid terpyridine-based building blocks allow easy access to large polymetallomacrocycles (see picture) through a self-assembly process. Such routes are envisioned to provide one-step methods to higher order motifs and facilitate the creation of precisely organized, metal-based networks for new energy storage devices.

Isocyanate‐Based Dendritic Building Blocks: Combinatorial Tier Construction and Macromolecular‐Property Modification

Used individually or combinatorially, unique isocyanate-based dendritic monomers generate homo- and heterofunctional materials (the sketch shows schematically a molecule with a heterofunctional surface). Tier construction by combinatorial monomer addition offers new avenues to macromolecular architectural design and the control of physical properties.

Dendrimer construction and macromolecular property modification via combinatorial methods

The design and utility of a family of isocyanate functionalized branched monomers, as well as others, are described. Use of these monomers in logical combinations for the construction of branched architectures leads to the formation of unique, asymmetric dendritic species possessing multiple functionalities. Ramifications of this combinatorial‐based, macromolecular construction technique are discussed with respect to functional group positioning and the potential to create dynamic heterogenous surfaces resembling a molecular “Rubiks sphere.”

Selbstorganisation und gesteuerte Organisation von Hexaruthenium‐Makrocyclen

Starre Bausteine auf Terpyridinbasis bilden den Schlussel zum leichten Aufbau ausgedehnter Polymetallomakrocyclen (siehe Bild) durch einen Selbstorganisationsprozes. Uber derartige Wege sollten auch Strukturmotive hoherer Ordnung in einstufigen Verfahren zuganglich werden. Daruber hinaus sollten auf diese Weise leichter prazise organisierte Koordinationsnetze hergestellt werden konnen, die als neuartige Energiespeicher von Interesse sind.

Observations on the thermoreversible gelation of two‐directional arborols in water–methanol mixtures

Reversible gels of two-directional cascade polymers with hydrophilic groups covalently attached by an hydrophobic center chain were studied by light and small- angle X-ray scattering, differential scanning calorimetry, and freeze-fracture transmis- sion electron microscopy. The long, self-assembled fibers interact side-by-side over ex- tended regions to form bundles. A given fiber may participate in several bundles, thus forming a three-dimensional gel network. q 1997 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 35: 2787-2793, 1997