http://localhost:8080/xmlui/handle/123456789/503 2013 publications Thu, 09 Apr 2026 04:16:18 GMT 2026-04-09T04:16:18Z http://localhost:8080/xmlui/handle/123456789/2609 N‑Heterocyclic Carbene Catalyzed Reaction of Cinnamils Leading to the Formation of 2,3,8-Triaryl Vinyl Fulvenes: An Uncommon Transformation Sinu, C R; Eringathodi, Suresh; Vijay Nair In the general context of organocatalysis,1 N-heterocyclic carbenes (NHCs) occupy a prominent position. NHC catalysis2 originated as early as 1958 with Breslow’s demonstration3 that thiazolylidene was involved in the thiazolium catalyzed benzoin condensation.4 However, with the exception of its application in benzoin condensation 5 and the Stetter reaction,6 NHC catalysis received little attention for a long time. A significant change in this situation occurred in 2004, when Glorius7 and Bode8 Sun, 12 Feb 2012 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/2609 2012-02-12T00:00:00Z http://localhost:8080/xmlui/handle/123456789/2607 Effect of precursor particle size distribution on the morphology and low wetting behavior of photocatalytic nanocoatings on glass surfaces Venu Sreekala, Smitha; Petit, Francois; Hareesh, Unnikrishnan Nair Saraswathy; Warrier, Krishna Gopakumar The effect of particle size distribution of coating precursor on the morphology and low wetting character of photocatalytic nanocoatings is investigated in the present work. TiO2–SiO2–Al2O3 nanocomposite coatings containing Al2O3 particles of size in the range 20–200 nm have been prepared on glass substrates by an aqueous sol–gel process. A composite sol of titanium dioxide containing 30 mol% silica comprises the matrix sol to which alumina particles (1–10 mol%) having sizes in the range 20 to 200 nm are introduced as stabilized dispersions and further coated on glass substrates by the dip-coating method followed by annealing of the coatings at 400 C. A composite coating containing 2 mol% boehmite derived alumina (TS-B-2) has been found to be more photoactive under visible light and was low wetting in nature. The higher photocatalytic activity of the TS-B-2 nanocomposite is attributed to the presence of phase pure anatase with crystallite size of 3.7 nm and high surface area of 315 m2 g 1, while the low wetting character is attributed to the hierarchical morphology resulting in uniform surface roughness. The present study significantly highlights the possibility of designing composite precursors containing desired constituent particle sizes to produce nanocoatings differing in grain sizes, surface roughness and morphology, resulting in increased self-cleaning and low wetting properties. Wed, 07 Aug 2013 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/2607 2013-08-07T00:00:00Z http://localhost:8080/xmlui/handle/123456789/2587 Preparation and Characterization of Selenium Incorporated Guar Gum Nanoparticle and Its Interaction with H9c2 Cells Rema Sreenivasan, Soumya; Vadavanath Prabhakaran, Vineetha; Premachandran Latha, Reshma; Kozhiparambil Gopalan, Raghu This study deals with the preparation and characterization of selenium incorporated guar gum nanoparticle (SGG), and its effect on H9c2 cardiomyoblast. Herein, nanoprecipitation techniques had been employed for the preparation of SGG nanoparticle. The prepared nanoparticle had been subjected to various types of analytical techniques like transmission electron microscopy (TEM), X-ray diffraction (XRD) and particle size analysis to confirm the characteristics of nanoparticle as well as for selenium incorporation. Physical characterization of nanoparticle showed that the size of nanoparticles increase upto ,69–173 nm upon selenium incorporation from ,41–132 nm. Then the prepared nanoparticles were evaluated for its effect on H9c2 cells. In this regard, the effect of nanoparticle on various vital parameters of H9c2 cells was studied. Parameters like cell viability, uptake of selenium incorporated guar gum nanoparticle by the cells, effect of SGG on DNA integrity, apoptosis, reactive oxygen species generation, alteration in transmembrane potential of mitochondria and cytoskeletal integrity had been investigated. Viability results showed that up to 25 nM of SGG was safe (10.31%) but beyond that it induces cytotoxicity. Cellular uptake of selenium showed that cell permeability for SGG is significantly high compared to normal selenium (7.2 nM of selenium for 25 nM SGG compared with 5.2 nM selenium for 25 nM sodium selenite). There was no apoptosis with SGG and also it protects DNA from hydroxyl radical induced breakage. Likewise no adverse effect on mitochondria and cytoskeleton was observed for 25 nM of SGG. Overall results reveal that SGG is highly suitable for biomedical research application. Mon, 30 Sep 2013 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/2587 2013-09-30T00:00:00Z http://localhost:8080/xmlui/handle/123456789/2584 Fluorine interaction controlled AIEE phenomenon in an expanded calixbenzophyrin and its vapoluminescent response: turn on emission with volatile ketones and esters Salini, P.S; Holaday, M. G. Derry; Reddy, M. L. P; Suresh, C. H.; Srinivasan, A Fluorine interaction assisted AIEE characteristic in an expanded calixbenzophyrin is presented by single-crystal X-ray-diffraction analysis and molecular modelling approaches. Selective exposure to volatile organic compounds such as ketones and esters results in the breaking of fluorine interaction, leading to enhanced monomer emission Wed, 23 Jan 2013 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/2584 2013-01-23T00:00:00Z