Bojana G. Jeliazkova*, Julia K. Panajotova Department of Chemistry, Sofia University, 1, James Bourchier ave, 1126 Sofia, Bulgaria Dedicated to Prof. Hitoshi Ohtaki on the occasion o f his 60th birthday Z. Naturforsch. 50b, 524-528 (1995); received October 17, 1994 Charge Transfer Photochemistry, Bis(8-quinolinolato)Cu(II), Bis(8-quinolinethiolato)Cu(II) The photochemistry of bis(8-quinolinolat...

Photochemistry is a tremendous research field offering many synthetic possibilities to chemists. Breakthroughs in this area have been notably driven by the implementation of new classes photocatalysts. Within context, Bodipy (Boron-dipyrromethene) dyes possess attractive chemical and physical features such as their modularity, strong absorption under visible light irradiation, good thermal phot...

To determine the mechanism of carotenoid-sensitized non-photochemical quenching in cyanobacteria, the kinetics of blue-light-induced quenching and fluorescence spectra were studied in the wild type and mutants of Synechocystis sp. PCC 6803 grown with or without iron. The blue-light-induced quenching was observed in the wild type as well as in mutants lacking PS II or IsiA confirming that neithe...

CASSCF and CASPT2 methods were used to study the photochemistry of tricyclo[3.3.0.0(2,6)]octa-3,7-diene (TOD). The analysis of different S1 reaction paths as well as the topology of the S1/S0 intersection space allows us to establish two novel properties associated with the photochemical behavior of this compound: (i) simple low-lying intersection space domains can mediate different photoproduc...

Nitrogen is a major limiting factor for crop productivity. The relationship between photosynthesis and nitrogen nutrition has been widely studied. However, the molecular response of leaf photosynthesis to low nitrogen supply in crops is less clear. In this study, RNA sequencing technology (RNA-Seq) was used to investigate the gene expressions related to photosynthesis in maize in response to lo...

The primary photochemistry of Fe-depleted and Zn-reconstituted reaction centers from Rhodopseudomonas sphaeroides R-26.1 was studied by transient absorption spectroscopy and compared with native, Fe(2+)-containing reaction centers. Excitation of metal-free reaction centers with 30-ps flashes produced the initial charge-separated state P(+)I(-) (P(+)BPh(-), where P is the primary donor and BPh i...

Photochemical interconversion between the red-absorbing (P(r)) and the far-red-absorbing (P(fr)) forms of the photosensory protein phytochrome initiates signal transduction in bacteria and higher plants. The P(r)-to-P(fr) transition commences with a rapid Z-to-E photoisomerization at the C(15)=C(16) methine bridge of the bilin prosthetic group. Here, we use femtosecond stimulated Raman spectros...

The photochemistry and molecular structure of 1-phenyl-4-allyl-tetrazolone (PAT) was studied by FT-IR matrix isolation spectroscopy and DFT(B3LYP)/6-311++G(d,p) calculations. The spectrum of matrix-isolated PAT monomers agrees well with the sum spectrum of three conformers predicted theoretically. UV irradiation (lambda > 235 nm) of matrix-isolated PAT induces three types of photofragmentation:...

Starting from the various primary photochemical processes (luminescence, non-radiative transition to the ground state, electron and energy transfer, isomerization, addition, hydrogen abstraction, and fragmentation), the most important technical applications of photochemistry are reviewed. The main applications of luminescence phenomena are optical bleaching of textiles and paper. Rapid radiatio...