Frontispiece: Cooperative Photochemical Reaction Kinetics in Organic Molecular Crystals

Excitons in Organic Molecular Crystals

Identifying Molecular Organic Codes in Reaction Networks

Studying semantics is strongly connected to studying codes that link signs to meanings. Here we suggest a formal method to identify organic codes at a molecular level. We define a molecular organic code with respect to a given reaction network as a mapping between two sets of molecular species called signs and meanings, respectively, such that (a) this mapping can be realized by a third set of ...

The Photochemical Reaction in Photosynthesis

Measurements of photosynthesis were made in continuous and flashing light of high intensity, using cells varying in chlorophyll content. The amount of chlorophyll present per molecule of carbon dioxide reduced per single flash of light was found to be about 2480 molecules. The length of time required for one unit in the photosynthetic mechanism to complete the cycle of photochemical and Blackma...

Functionalization of organic semiconductor crystals via the Diels-Alder reaction.

A surface adlayer is generated on organic single crystals (tetracene and rubrene) using the site specific Diels-Alder reaction and a series of vapor phase dienophiles. X-ray photoelectron spectroscopy (XPS) confirms adsorption on the surfaces of tetracene and rubrene and mass spectrometry demonstrates the reaction's applicability to a range of dienophiles.

Cofactor-specific photochemical function resolved by ultrafast spectroscopy in photosynthetic reaction center crystals.

High-resolution mapping of cofactor-specific photochemistry in photosynthetic reaction centers (RCs) from Rhodobacter sphaeroides was achieved by polarization selective ultrafast spectroscopy in single crystals at cryogenic temperature. By exploiting the fixed orientation of cofactors within crystals, we isolated a single transition within the multicofactor manifold, and elucidated the site-spe...