6-Arylphenanthridines were synthesized in good to excellent yields from inexpensive and environmentally benign N-(2-aminoaryl)-diphenylmethanimine as a starting material under visible light-photocatalyzed conditions.

Present study reports the simple and cost effective thermolytic method for the synthesis of cobalt sulphide nanoparticles (CoS NPs). The PXRD spectrum of cobalt sulphide (CdS) nanoparticles exhibited four peaks indexed to (100), (101), (102) and (110) crystal planes. The average particle size observed from DLS and PXRD was in the range 4.81-12.20 nm. A blue shift in band gap was observed from UV-visible spectra. The FESEM and TEM studies revealed that cobalt sulfide nanoparticles are of cubic and rectangle shapes. FTIR spectra of hexadecylamine (HDA) capped CoS NPs exhibited ν(N-H) absorption around 3350-3240 cm–1. The stretching frequency due to ν(Co-S) appeared in the region 334-332 cm–1. Proton NMR (1H) spectra of CoS NPs showed signals at nearly same positions as in case of capping agent, suggesting its capping nature. ESI-MS analyses of cobalt sulphide nanoparticles displayed peak at m/z = 124.93 corresponding to the [CoS2]+ ion. Thermogravimetric curves showed single step decomposition corresponding to 84.28% weight loss and 15.72% as final residue due to cobalt oxide. The degradation rate of rhodamine B and malachite green dyes after irradiating with sunlight showed 92-94% degradation while irradiated with UV-light of 4.8 eV show much slower degradation rate.

A Umemoto's reagent-free and cost-effective method for synthesis of trifluoromethylated benzoxazines by 9,10-phenanthrenedione visible-light photocatalysis is described in this article.

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Some new cobalt(II) carbodithioates, viz. [Co (4-EtPipzcdtH) m ]X n (4-EtPipzcdtH = 4-ethylpiperazine-1-carbodithioic acid, X = Cl, Br, ClO 4 , NO 3 and CH 3 COO when m = n = 2 and SO 4 , CO 3 when m = 2 and n = 1), have been synthesized and characterized. Infrared and UVVis spectral data along with room temperature magnetic behaviour (2.50-2.85 B.M.) indicate chelating bidentate mode of coordination of ligand, 4-EtPipzcdtH with four coordination around Co(II). 1 H NMR and ESMS of [Co(4-EtPipzcdtH) 2 ]Cl 2 further support its structure. Molar conductance study shows 1:2 electrolytic behaviour for complexes with Cl, Br, ClO 4 , NO 3 and CH 3 COO as counter anions, while 1:1 electrolytic behaviour for CO 3 and SO 4 as counter anions. Ligand and its complexes have also been studied using non-isothermal techniques (TG and DSC). The anion has been found to play pronounced effect on the nature of thermal decomposition products. The DSC curves of the complexes displayed very sharp exothermic peaks.