Ru(II) polypyridine complexes: photophysics, photochemistry, eletrochemistry, and chemiluminescence

Thiosemicarbazone complexes of copper(II): structural and biological studies

Ruthenium compounds, particularly Ru(II) polypyridine complexes, are the class of transition metal complexes which has been most deeply investigated from a photochemical viewpoint. The reason for such great interest stems from a unique combination of chemical stability, redox properties, excited-state reactivity, luminescence emission, and excited-state lifetime. Ruthenium polypyridine complexes are indeed good visible light absorbers, feature relatively intense and long-lived luminescence, and can undergo reversible redox processes in both the ground and excited states. This chapter presents some general concepts on the photochemical properties of Ru(II) polypyridine complexes and gives an overview of various research topics involving ruthenium photochemistry which have emerged in the last 15 years. In particular, aspects connected to supramolecular photochemistry and photophysics are discussed, such as multicomponent systems for light harvesting and photoinduced charge separation, systems for photoinduced multielectron/hole storage, and photocatalytic processes based on supramolecular Ru(II) polypyridine species. Interaction with biological systems and dye-sensitized photoelectrochemical cells are also briefly discussed.

Photochemistry and Photophysics of Coordination Compounds: Ruthenium

Synthesis of quinazolinones and quinazolines

Chemosystematics is a common tool in systematics and taxonomy of extant plants. Terpenoids have been found to be especially valuable for chemosystematic investigations of conifers. A review of data in the extensive literature revealed some characteristic distribution patterns of sesqui-, di-, and triterpenoids in extant conifer families. The numerous terpenoids can be assigned to approximately 40 sesquiterpenoid, 17 diterpenoid, and only a few triterpenoid structural classes. Some of these terpenoid classes (e.g., cadinanes, humulanes, labdanes, pimaranes) are unspecific and distributed among all conifers. Other structural classes occur in certain clusters of families (e.g., totaranes in Podocarpaceae, Taxodiaceae, and Cupressaceae s.str.) or were restricted to species of only one conifer family (e.g., cuparanes in Cupressaceae s.str.).

https://www.jstor.org/stable/pdfplus/4354389.pdf

Sesqui-, di-, and triterpenoids as chemosystematic markers in extant conifers—A review

Hydrazidoyl Halides in the Synthesis of Heterocycles

Heterocyclic π-Complexes of the transition metals

Experimental and theoretical dipole moments of purines in their ground and lowest excited singlet states

In the present paper, the authors will compare the actual correlative abilities of the HMO, SCF-MO, and the Pauling theories by statistical techniques.

Cyril Párkányi

Papers

Hydrazidoyl Halides in the Synthesis of Heterocycles

Heterocyclic π-Complexes of the transition metals

Experimental and theoretical dipole moments of purines in their ground and lowest excited singlet states

π [Pi] bond orders and bond lengths

Perturbation-graph theory—I: Resonance energies of heteroannulene π systems