Electron Acceptors Based on Cyclopentannulated Tetracenes

New cyclopenta-fused polycyclic aromatic hydrocarbons (CP-PAHs) based on tetracene have been prepared by a palladium-catalyzed cyclopentannulation reaction. The new compounds have low-energy lowest unoccupied molecular orbitals (LUMOs) and relatively small band gaps. The photooxidative stability was intermediate to previously prepared CP-PAHs based on anthracene and pentacene as found in traditional acene stabilities. Scholl cyclodehydrogenation of pendant aryl groups led to materials that quickly formed endoperoxide products.

Singlet oxygen quantum yields and photostability of planar binuclear phthalocyanines

The singlet oxygen ([Formula: see text]O[Formula: see text] quantum yield of the near-infrared absorbing ([Formula: see text] [Formula: see text] 839 nm) planar [Formula: see text]-conjugated binuclear zinc phthalocyanine (ZnPc) was measured and compared to the [Formula: see text]O[Formula: see text] quantum yields of the mononuclear and the planar binuclear phthalocyanine without [Formula: see text]-conjugation between Pc rings. In addition, the photooxidative stability of the [Formula: see text]-conjugated binuclear Pc was determined and compared to the stabilities of the mononuclear ZnPc and the known near-infrared photosensitizer, zinc tetra-tert-butylnaphthalocyanine ([Formula: see text] 761 nm). The results are explained by DFT calculations and cyclic voltammetry.

A novel porphyrinic photosensitizer based on the molecular complex of meso-tetraphenylporphyrin with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone: higher photocatalytic activity, photooxidative stability and solubility in non-chlorinated solvents

The 1 : 2 molecular complex ofmeso-tetraphenylporphyrin with 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) has been used as a promising photosensitizer for the aerobic oxidation of olefins in different chlorinated and non-chlorinated solvents.

Synthesis, stability and electrical properties of new soluble pentacenes with unsaturated side groups

A series of pentacene derivatives with unsaturated hydrocarbon substituents at the 6,13-positions as side groups have been synthesized to improve the solubility and photooxidative stability of pentacene.