A new synthetic strategy toward novel linear two-dimensional graphene nanoribbons up to 12 nm has been established. The nanoribbons are characterized by MS, UV/vis, and scanning tunneling microscopy (STM). Various microscopic studies of these novel structures showed a high tendency to self-assemble.

No abstract

The molecular dynamics of three dipole functionalized hexa-peri-hexabenzocoronenes have been studied using site-specific NMR techniques and dielectric spectroscopy as a function of temperature and pressure. These probes (i) suggest that the thermodynamic state completely controls the dynamic response, (ii) clarify the origin of two dynamic processes associated with the presence of two glass temperatures, and (iii) provide the first phase diagram for substances of this kind.

No abstract

The self-assembly, the molecular dynamics, and the kinetics of structure formation are studied in dipole-functionalized hexabenzocoronene (HBC) derivatives. Dipole substitution destabilizes the columnar crystalline phase except for the dimethoxy- and monoethynyl-substituted HBCs that undergo a reversible transformation to the crystalline phase. The disk dynamics are studied by dielectric spectroscopy and site-specific NMR techniques that provide both the time-scale and geometry of motion. Application of pressure results in the thermodynamic phase diagram that shows increasing stability of the crystalline phase at elevated pressures. Long-lived metastability was found during the transformation between the two phases. These results suggest new thermodynamic and kinetic pathways that favor the phase with the highest charge carrier mobility.

Evidence for a band‐like, lateral transport of electrons through the cores of HBC‐thiolates, forming a highly ordered self‐assembled monolayer (SAM) containing a very regular array of HBC‐cores, is provided based on a detailed analysis of temperature‐dependent scanning tunneling microscopy (STM) data recorded for islands of aromatic SAMs immersed in an insulating matrix.

A simple dimethoxy-substituted hexa-peri-hexabenzocoronene (m-dimethoxy HBC) was unexpectedly obtained along with a bis-spirocyclic dienone during an intramolecular Scholl reaction of its para isomer.

No abstract