We report on the synthesis, metal coordination, and catalytic impact of histidylidene, a histidine-derived N-heterocyclic carbene (NHC) ligand. The histidinium salt 3, comprising methyl substituents at both heterocyclic nitrogens and protected at the C- and N-terminus of the amino acid, was rhodated and iridated by a transmetallation protocol using Ag(2)O. Ambient temperature and short reaction...

In this chapter, we report on our recent studies of on-surface Ullmann coupling reaction and focus on the roles of the transition metals in the reaction. First, we discuss an organometallic intermediate state, which separates the reaction into two steps. Next, we examine the catalytic efficiency of Cu, Au, Ag, Pt, and Pd in the reaction. We analyze the bond formation yields when the reaction ta...

An emerging strategy towards the sophistication of supramolecular nanomaterials is the use of supracolloidal self-assembly, in which micelles or colloids are used as building blocks. Binding directionality can produce nanostructures with attractive properties. Herein, we present a new directional supracolloidal self-assembly by virtue of dynamic covalent bonds and metal coordination in water. C...

The Front Cover shows the CO2 chemisorption behavior of coordination-derived phenolate sorbents. Phenolate-based systems were constructed via coordination between alkali metal cations (Li+ or Na+) with crown ethers to avoid participation active protons in chemisorption. uptake could be achieved by O−C bond formation afford carbonate. capacity and reaction enthalpy significantly influenced effec...

Palladium (II) coordination complexes catalyze the reaction of alcohols with ketones to yield ethers. During the catalytic cycle, the alcohol adds selectively to the β-carbon (anti-Markovnikov). In this work, mechanism and kinetics for the reaction of methanol with methyl vinyl ketone (MVK), being catalyzed by Pd, has been theoretically investigated in detail. Using quantum mechanical approach,...

An approach to the intramolecular Diels-Alder reaction has led to a cascade synthesis of complex carbocycles composed of three fused rings and up to five stereocenters with complete stereocontrol. Computational analysis reveals that the reaction proceeds by a Michael/Michael/cyclopropanation/epimerization cascade in which size and coordination of the counterion is key.

An unprecedented layered Pb-Kemp's triacid compound, Pb3[C6(CH3)3(CO2)3H6]2[DMF]3, has been synthesized. The material exhibits a selective CO2 adsorption, a reversible DMF coordination, and an intercalative hexanal addition reaction. A competing crystallization reaction under solvothermal conditions using Pb(2+) and Cd(2+) with Kemp's triacid reveals higher selectivity of Cd(2+) over Pb(2+).

Contemporary working environments are increasingly complex, volatile and physically distributed. Coordinating work in such environments is therefore becoming a major challenge as the traditional focus on efficient schedules is shifting to include other factors such as rapid reaction to market changes. This paper argues that effective coordination support should be based on a two-level coordinat...