Samantha A. Ranaweera

University of Ruhuna · Department of Chemistry

A Schiff base derived from ethylenediamine and heptane-2,4,6-trione, namely, 5,9,14,18-tetramethyl-1,4,10,13-tetraazacyclooctadeca-5,8,14,17-tetraene-7,16-dione (C 18 H 28 N 4 O 2 ), abbreviated H 4 daaden, was prepared and characterized for the first time by single-crystal X-ray diffraction. The atoms of the Schiff base occupy two different planes...

Chitin is the second most abundant natural polysaccharide and bio-waste material after cellulose which is structurally similar to cellulose except that the hydroxyl group of cellulose at the C-2 position is replaced by an acetamide group. Chitosan is a linear polymer produced by the alkaline deacetylation of chitin where primary amine groups (−NH2)...

Wild relatives of cultivated cinnamon (Cinnamomum verum J. Presl) are underutilized and endangered in Sri Lanka. There is a lack of knowledge on wild relatives of cinnamon, hampering their utilization in breeding and industry. Morphology, floral behaviour and leaf essential oil composition of selected wild relatives were determined under ex-situ...

Homo and hetero-dinuclear metal complexes were used as precursors to model, supported, mixed and non-mixed metal oxide catalysts. These metal complexes contained either Co(II) pairs, Ni(II) pairs, or the mixed pair: Co(II)–Ni(II) having the (dba) ligands. Another mixed pair, Cu(II)–Co(II) was prepared having the (daaen) ligand. Calcination and redu...

Silica-supported model copper catalysts were p r ep a r ed b y s up p o r t in g bi s(1 , 5-d ip h e n yl-1 , 3 , 5-pentanetrionato)dicopper(II), Cu 2 (dba) 2 , on Cab-O-Sil by a batch impregnation technique. This metal complex showed a strong affinity for the silica support, developing monolayer coverages near the value predicted from a considerat...

Models of silica supported cobalt catalysts were formed by decorating the surface of Cab-O-Sil with the dinuclear cobalt complex, bis(1,5-diphenyl-1,3,5-pentanetrionato) dicobalt(II), [Co2(dba)2]. To confirm the formation of a monolayer and multilayer of the complex on Cab-O-Sil, various loadings of [Co2(dba)2] were combined with Cab-O-Sil by batch...

The present invention provides a novel process and system in which a mixture of carbon monoxide and hydrogen synthesis gas, or sygas, is converted into hydrocarbon mixtures composed of high quality distillates, gasoline components, and lower molecular weight gaseous olefins in one reactor or step. The invention utilizes a novel supported bimetallic...

Bis(heptane-2,4,6-trionato)dicopper (II), [Cu2(daa)2], was deposited on a silica gel support by stirring a THF solution of Cu2(daa)2 with Cab-O-Sil. Adsorption of the complex from solution onto silica gel was monitored using UV-visible spectroscopy. This catalyst precursor with a monolayer coating was characterized by IR spectroscopy, thermal gravi...