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A novel unsymmetrical zinc phthalocyanine complex (PCA-ZnPc-3) containing six 2,6-diphenylphenoxy donor groups and pyrazole-3-carboxylic acid anchoring group has been synthesized and used as a sensitizer for dye-sensitized solar cells (DSSCs). The optical, electrochemical and photovoltaic characteristics were evaluated and compared with the dyes containing the same anchoring group and tert-butyl (PCA-ZnPc-1) or hexylsulfanyl (PCA-ZnPc-2) donor groups, developed by our group. The DSSC with PCA-ZnPc-3 exhibited a higher power conversion efficiency (PCE) of 2.04% as compared to that of PCA-ZnPc-1 (PCE = 1.74%) and PCA-ZnPc-2 (PCE = 1.89%). This enhancement in efficiency may be ascribed to the less dye aggregation and appropriate dye coverage. These results suggest that the incorporation of 2,6-diphenylphenoxy into pyrazole-3-carboxylic acid-based zinc phthalocyanine sensitizers can improve photovoltaic performance of DSSCs.

Makale, WOS:000904967000006, Tetracyclic molecules show important properties such as biological activities and fluorescence sensors. Hence, in this study, we have reported unknown tetracyclic skeleton. N -propargylated C-2 and C-4 disubstituted imidazole derivatives were reacted by 2-aminomethyl piperidine without using any transition metal. The reaction unveiled 16 different imidazo[1,2-a]pyrido[1 ' ,2 ' :3,4]imidazo[2,1-c]pyrazine skeletons. Cyclization reaction tolerated phenyl, naphthyl, bi-phenyl, 2-thienyl, and many substituents on the benzene ring such as OMe, CF 3 , and halogens. We have uncovered the exact structure of the tetracyclic skeleton using single-crystal X-ray analysis. Significant fluorescence emission of tetracyclic molecules was investigated, and derivatives bearing electron-withdrawing groups, CF 3 , and the 2-thienyl group possessed a bathochromic effect (shift to longer wavelength) which was confirmed by not only steady-state experiments but HOMOs and LUMOs calculations. The antimicrobial effects of the synthesized molecules on six different or ganisms were tested. Considerable activities of molecules 5p and 5n on many organisms were determined. Docking modeling and Lipinski, Ghose, and Veber compatibility studies of two different molecules were performed., Scientific and Technological Research Council of Türkiye (TUBITAK)

Graphene oxide (GO) and their natural/synthetic composites are encouraging tools for humanity. There is a need to address critical challenges and potential risk possibilities in GO-based architectures, which have a wide range of uses. In this study, ecotoxicological levels as well as GO-based nanoparticle synthesis, characterization, interaction mechanism and toxicity detection levels for potential biomedical applications were determined on zebrafish (Danio rerio). The effects of GO-ED-BA NP (graphene oxide-boramidic acid nano particles) which was characterized by FT-IR, SEM, TEM, and BET on survival rate, morphological abnormalities (yolk sac edema, lordosis/kyphosis, pericardial edema, and tail malformation), hatching rate as well as neuronal degeneration /necrosis, 8 OHdG and TNF-alpha expression were observed in D. rerio embryos and larvae. In the obtained findings, it was determined that the toxicity profile of GO-ED-BA NP appeared similar, in high-dose application with single GO use, causing a cytotoxic, pro-inflammatory response and triggering oxidative stress. However, increased malformation rates and mortality at the highest concentration were due to nanoparticle sizes and GO. The presence of boramidic acid unit on graphene nanostructure changed the GO's toxicity profile and positively directed the proinflammatory and oxidative stress response. Synthesizing of graphene oxide-boramidic acid and its toxicity panels compared to graphene oxide are reported for the first time in this study.

ABS T R A C T Appropriate synthesis methods gave six different indole derivatives substituted at the C-2 or C-3 position. ESIPT emission capacities of these derivatives were investigated. It was concluded that the indole derivative containing the 1,2-dicarbonyl group at the C-2 position has ESIPT emission. Although adding water to the DMSO solution of the ESIPT-based molecule (9:1) resulted in ESIPT quenching, steady-state measurements in MeOH did not occur ESIPT quenching. TD-DFT calculation for uncovering the ESIPT mechanism emerged that the ESIPT mechanism occurred as a barrierless process. The X-ray analysis and DFT conformational analysis revealed that NH and CO groups involving proton transfer mechanisms are in the cis position. A mono-exponential decay was observed in DMSO and MeOH solutions, in which lifetimes were measured as 6.1 and 5.5 ns, respectively. pH studies revealed that acidic and basic solutions of molecule 7 did not influence ESIPT emission.

Indole containing dyes were synthesized via a simple method with high yield. These molecules have different colors and UV-vis spectra of them were recorded. Impact of solvents on absorbances was investigated and it was observed that basic solvent such as DMF and pyridine have blue shift. TD-DFT calculations were done and results were compared with experimental data. NMR data of molecules were analyzed and tautomeric forms of colorants and their ratio were determined. It was find out that two tautomers might be formed in solution, called indole and indolenine form. HOMO-LUMO and energy gaps were calculated and plotted. Furthermore, molecular electrostatic potentials were simulated to find out electrophilic and nucleophilic regions. (C) 2016 Elsevier B.V. All rights reserved.

Menges, Nurettin/0000-0002-5990-6275 WOS: 000255270500037 Oxalacetic acid and pyruvic acid derivatives have been synthesized efficiently in high yields by the treatment of 4-ethoxycarbonyl-5phenyl-2,3-furandione and 4-benzoyl-5-phenyl-2,3-furandione with 2-phenylindole at room temperature and converted to simple derivatives such as an ester or a hydrazone. (C) 2008 Elsevier Ltd. All rights reserved.