Catalytic Synthesis of Luminescent Pyrimidines via Acceptor-less Dehydrogenative Coupling

A simple catalytic synthesis of luminescent pyrimidines from benzamidines and alcohols is reported. These one-pot, acceptor-less dehydrogenative coupling reactions are catalyzed by a ruthenium hydrido chloride complex (1), supported by a chelating P^N ligand (L1) bearing a benzannulated phenanthridine donor arm. The pyrimidines thus produced are emissive in solution, with photoluminescence quantum yields reaching 72%. Details of the catalytic synthesis and characterization of the pyrimidines in both solution and the solid state are reported, along with computational modeling of the emissive excited states of representative examples.

Combined SERS/DFT studies of push–pull chromophore self-assembled monolayers: insights into their surface orientation

Having clear and deep information on the surface/interface of deposited molecules is of crucial importance for the development of efficient optoelectronic devices.

Synthesis and Electrochemical and Photophysical Characterization of New 4,4'-π-Conjugated 2,2'-Bipyridines that are End-Capped with Cyanoacrylic Acid/Ester Groups

Two new functionalized 4,4'-disubstituted 2,2'-bipyridines that were end-capped with cyanoacrylic acid or cyanoacrylic acid ester anchoring groups, which might allow their efficient functionalization on TiO2 or other metal-oxide semiconductor surfaces, have been synthesized and characterized by electrochemical, photophysical, and spectroscopic measurements. The electrochemical and photophysical properties of these 4,4'-disubstituted 2,2'-bipyridines with extended π systems, in particular their LUMO energies, make them promising candidates to build up inorganic-organic hybrid photosensitizers for the sensitization of metal-oxide semiconductors (e.g., TiO2 nanoparticles and/or nanotubes).

Cyclometalated iridium(iii) complexes of (aryl)ethenyl functionalized 2,2′-bipyridine: synthesis, photophysical properties and trans–cis isomerization behavior

The syntheses and photoinduced trans–cis isomerization behavior of 4,4′-(aryl)ethenyl functionalized 2,2′-bipyridyls and their cyclometalated iridium(iii) complexes have been investigated by NMR and electronic spectroscopy, X-ray crystallography and combined DFT-TDDFT studies.

Synthesis, self-assembly and characterization of a novel push–pull thiophene-based chromophore on a gold surface

A self-assembled dense monolayer based on a non-charged push–pull chromophore is clearly evidenced by electrochemical, XPS and STM analysis. Associated with good film properties a conducting behavior consistent with the structure of the SAM-organized push–pull is also shown.