http://nopr.niscair.res.in/handle/123456789/7147 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/7192 Title: Undoped, single phase barite BaCrO₄ photocatalyst for the degradation of methylene blue under visible light <br/> <br/>Authors: Thakare, Sanjay R; Patil, S R; Choudhari, M D <br/> <br/>Abstract: The<b> </b>photoassisted degradation of a phenothiazine dye, methylene blue, has been examined in aqueous dispersions under visible irradiation at wavelengths greater than 400 nm with BaCrO₄ and bare TiO₂. Spectral changes during the photocatalytic degradation of methylene blue suggest that the de-methylation is an initiation process of photocatalysis reaction followed by ring opening and finally mineralisation into mineral acid and water. Comparative study shows that BaCrO₄ is a better photocatalyst than bare TiO₂under visible light irradiation. COD analysis suggests that the degradation of methylene blue is due to photocatalysis and not due to any other reason. Catalytic poisoning is observed for both the photocatalysts.<b></b> <br/> <br/>Page(s): 54-58 http://nopr.niscair.res.in/handle/123456789/7191 Title: Chemoselective hydrogenation of crotonaldehyde to crotyl alcohol over Pt/Ce_xSm_1-xO_{2-<img src='/image/spc_char/delta1.gif' border=0>} catalysts <br/> <br/>Authors: Jin, Ling-Yun; Tao, Li-Ping; Liu, Xi-Jing; Xie, Guan-Qun; Lu, Ji-Qing; Luo, Meng-Fei <br/> <br/>Abstract: Pt/Ce_xSm_1-xO_2-_{<img src='/image/spc_char/delta1.gif' border=0>} catalysts have been prepared with impregnation method using H₂PtCl₆ as precursor. The selective vapor-phase hydrogenation of crotonaldehyde to crotyl alcohol over the catalysts has also been studied. It is found that introduction of Sm promotes the selective hydrogenation of C=O bond to crotyl alcohol due to formation of strong Lewis acidic sites. For Pt/Ce_0.8Sm_0.2O_{2-<img src='/image/spc_char/delta1.gif' border=0>} catalysts, with increasing reduction temperatures, the crotonaldehyde conversion decreases while the selectivity to crotyl alcohol increases. Also, during the reaction process there is carbon deposition on the catalyst surface, which results in decrease, both in the catalytic activity as well as selectivity. <br/> <br/>Page(s): 49-53 http://nopr.niscair.res.in/handle/123456789/7190 Title: Synthesis and novel fluorescence phenomenon of terbium(III) complex with N, N′, N″-tris (2-benzimidazolmethyl) amine <br/> <br/>Authors: Yang, Tianlin; Gao, Min; Qin, Wenwu; Yang, Jinhui <br/> <br/>Abstract: A benzimidazole ligand with a tripodal structure, N, N′, N″-tris (2-benzimidazolmethyl) amine, and its terbium (Ⅲ) complex has been synthesized. The complex has been characterized by element analysis, IR spectra, mass spectra, thermal analysis and molar conductivity. The terbium ion is found to coordinate with the nitrogen atoms（=N-）of imidazole ring and the bridgehead nitrogen atom. The fluorescence properties of the complex in aqueous solutions have been studied. Under excitation of UV light, the complex exhibits characteristic fluorescence of terbium ion. The luminescence of terbium complex in aqueous solutions is strongly enhanced by H⁺ concentration. This phenomenon makes the new complex favorable for use in fluorescence switches and sensors. The mechanism of the fluorescence enhancement by protonation of the nitrogen atoms（-NH-）of imidazole ring is due to the suppressed photoinduced electron transfer fluorescence quenching on addition of acid. <br/> <br/>Page(s): 45-48 http://nopr.niscair.res.in/handle/123456789/7189 Title: Synthesis and crystal structure of a triprotonated decavanadate, [(C₆H₅CH₂)(CH₃)₃N]₃[H₃V₁₀O₂₈].3H₂O <br/> <br/>Authors: Dewan, Anindita; Kakati, Dilip K; Das, Birinchi K <br/> <br/>Abstract: The title compound, [(C₆H₅CH₂)(CH₃)₃N]₃[H₃V₁₀O₂₈].3H₂O, has been obtained by treating V₂O₅with H₂O₂ in presence of benzyltrimethylammonium chloride and characterised. The crystal structure of the compound has been determined. The protonation sites on the cage surface of the decavanadate [H₃V₁₀O₂₈]^3- anion have been clearly identified. Intermolecular O-H...O hydrogen bonds involving the surface protons leads to the formation of an unprecedented zigzag chain of the [H₃V₁₀O₂₈]^3- anions. <br/> <br/>Page(s): 39-44