Dye-sensitized solar cells (DSSC) represent the third generation of solar cells which have revolutionized sustainable energy research owing to the fact that they act as a renewable energy source integrated with employment of environmentally benign light-harvesting pigments as sensitizers and cost-effective materials for manufacture. This review compiles the exploration of plant pigments with a potential for use as photosensitizers in solar cells, focusing on their isolation and the factors that affect their physicochemical properties to identify those pigments providing the optimum performance. Newly reported considera-tions of flavonoids, anthocyanins, carotenoids, betalains, and chlorophyll, as light-harvesting pigments are summarized. Further, outcomes of the solar cell efficiency obtained by various semiconductors and types of electrolytes are compared and discussed. The main goal of this review is to highlight the significance of naturally obtained light-harvesting pigments, which will be used as the promising class of sensitizers in DSSC.

A convenient and efficient approach toward the synthesis of seven aromatically substituted xanthendiones 1?7 and one structurally-related xanthenone 8 through condensation of dimedone and the appropriate aromatic aldehyde is reported. Further, their chemical structure was confirmed by melting points, elemental analysis, FT-IR, 1H-, 13C-NMR and UV?Vis spectroscopic methods. The relationship between the chemical structure and pharmacological activity was determined empirically using appropriate software packages and in vitro using the 2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) method. The results of in silico prediction suggested that all investigated compounds possess good oral bioavailability. The results of the ABTS assay indicate that five compounds possess the ability to scavenge the ABTS?+ radical cation. Based on the comparison of the IC50 values, the activity of the compounds was found to be as follows: 6 > 1 > 7 > 2 > 8. The effects of solvent dipolarity/ polarizability and solute solvent?hydrogen-bonding interactions on the shifts of the absorption maxima were rationalized by means of the linear solvation energy relationship concepts proposed by Kamlet?Taft and Catal?n.

The esters of substituted 1,4-dihydropyirdines (1,4-DHP) are formed in the reaction of an appropriate aldehyde and ethyl acetoacetate in the presence of concentrated water solution of ammonia. The esters form the amides by the reaction with primary amines. The series of the amides has been synthesized with the aim to analyze their chemical characteristics, antioxidant and antimicrobial activity. The amine used in this research is 2-aminothiazole. The antioxidant activity is analysed by 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-Azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) methods and the antimicrobial activity screening was performed by broth microdilution method, using different microbial strains. The characterization of the obtained amides was done by melting points, FTIR, NMR and elemental analysis. The possibilities for further research was suggested, which could lead to the application of selected compounds.

Derivati ferocena su poznati antioksidansi, antiparazitici, antitumorni, antivirusni, antibakterijski i antifungalni agensi. Pored primene u medicinskoj hemiji, derivati ferocena su od izuzetnog značaja u sintetičkoj organskoj hemiji, naročito u katalizovanim asimetričnim sintezama. Primenjuju se i u elektrohemiji i hemiji polimera, kao aditivi u gorivima, kao hemosenzori u agrohemiji i biosenzori glukoze i aktivnih komponenata u molekularnoj elektronici. U cilju dizajniranja novih antioksidativnih agenasa, u ovom radu, sintetisano je pet ferocenilhalkona koji su u potpunosti strukturno okarakterisani određivanjem temperature toplenja, FT-IR, ¹H i ¹³C NMR spektroskopskim metodama. Sintetisani halkoni međusobno se razlikuju prema vrsti i položaju supstituenta na fenil-grupi u položaju 1 linearnog nezasićenog karbonilnog sistema. Potencijalna antioksidativna aktivnost ovih jedinjenja procenjena je primenom ABTS (2,2'-azinobis-(3-etilbenzotiazolin-6-sulfonska kiselina) metode i određivanjem IC₅₀ vrednosti najefikasnijih jedinjenja.