Browsing by Author "Perera,K. Sarath D"

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    Agostic interaction and metallacycles
    (Institute of Chemistry Ceylon, 2023-06) Perera,K. Sarath D
    Coordinatively unsaturated metal centers may interact with a C-H bond of a coordinated ligand and then undergo C-H bond activation or fission to form metallacycles.
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    Aromaticity and Reactions of Aromatic Molecules/Ions
    (Institute of Chemistry Ceylon, 2021-06) Perera,K. Sarath D
    Fully conjugated (FC) and unsaturated ring systems are known as aromatic compounds. Aromaticity is a chemical property that determines the stability of cyclic molecules. Basically, there are three structural features that determine the aromaticity of a compound.
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    Biotoxins: Invisible threat to mankind
    (Institute of Chemistry Ceylon, 2020-09) Perera,K. Sarath D; Malawalaarachchi,Ovini N
    Biotoxins or germ weapons are infectious (diseaseproducing) agents such as bacteria, viruses, rickettsiae, fungi, or other biological agents – that may be utilized as weapons against humans, animals, or plants. Biological toxins are living organisms or replicating entities, and a human infected with deadly virus or bacteria could pose a threat to humans
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    Chemical aspects of black pepper - Piper nigrum
    (Institute of Chemistry Ceylon, 2024-09) Theeshya Dulmini ,A. D; Perera,K. Sarath D
    Black pepper is known all over the world as “King of Spices”, since it is not only an ingredient to make mouthwatering food, but also rich in immense medicinal value [1,2]. The pepper name is derived from the “Pippali” in Sanskrit [3]. According to history,
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    Chemical Aspects of Ginger (Zingiber officinale)
    (Institute of Chemistry Ceylon, 2024-01) Theeshya Dulmini ,A. D; Perera,K. Sarath D
    Ginger (Zingiber officinale) has emerged as one of the 20 top selling herbal supplements in USA over the last two decades [1]. It has more than 2000-year long history, thus, ginger holds a prominent place among the most famous folk medicine in many Asian countries exhibiting various medicinal properties: anti-oxidative, anti-cancerous, anti-inflammatory, anti-obesity, and ant-imicrobial effects [1-4]. Ginger exhibits these properties mainly due to the presence of phytochemicals (e.g., terpenes, polyphenols, flavonoids) in it [4,5]. Ginger enriches the flavor of the cuisines and serves as a natural food preservative [4, 6].
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    Chemical Constituents of Murunga Tree
    (Institute of Chemistry Ceylon, 2021-04) Perera,K. Sarath D; Theeshya Dulmini,A.D
    It is obvious to introduce Moringa oleifera (MO) or “Murunga” as the “miracle tree”, since every part of it has a prodigious medicinal value. Moringa is a genus of medicinal plants that consists of 13 species
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    Chemical Nature of Pesticides
    (Institute of Chemistry Ceylon, 2020-05) Perera,K. Sarath D; Theeshya Dulmini,A. D
    The phrase, “The Granary of the East” was used to describe the success of agriculture-based economy of our ancient nation. After European invasion, we lost our selfsustaining golden era, and gradually we started begging from developed countries and now we depend on their monetary loans and products
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    Chemistry of Perfumes
    (Institute of Chemistry Ceylon, 2020-01) Mallique Qader.M; Perera,K. Sarath D
    Perfumes or fragrances are the fusion of science and art: where chemists become creators and molecules make memories. Fragrances are unique. They are designed with care, passion and ingenuity.
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    Crystal Field Theory
    (Institute of Chemistry Ceylon, 2020-05) Perera,K. Sarath D
    Crystal Field Theory (CFT) supersedes valence bond theory as it provides a simple method to explain the electronic spectra and magnetism of transition metal complexes.
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    Cyclic Voltammetry
    (Institute of Chemistry Ceylon, 2024-01) Perera,K. Sarath D
    Cyclic voltammetry (CV) is used extensively by electrochemists to obtain the potential at which the chemical processes occur, and to obtain information about coupled homogeneous chemical reactions or the role of adsorption and diffusion of solution species.
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    Defense and Destruction: Insight of Chemical-based Weapons
    (Institute of Chemistry Ceylon, 2022-06) Malawalaarachchi, Ovini N; Perera,K. Sarath D
    Millions of deaths and the end of civilizations can be inflicted by knife, machete, fire, or even by the pen or the spoken word; but a Weapon of Mass Destruction (WMD) implies such a result more centrally imposed.
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    Diels-Alder Reaction
    (Institute of Chemistry Ceylon, 2023-06) Perera,K. Sarath D
    Diels-Alder (D-A) reaction is a (4π+2π) cycloaddition reaction. It is used to generate six-membered rings by combining two π-systems.
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    Electrophilic attack on Coordinated Ligands
    (Institute of Chemistry Ceylon, 2024-01) Perera,K. Sarath D
    Organometallic complexes have at least one organic group and they can undergo various types of reactions. Incoming electrophile may react with or attack on either the metal centre or on one of the coordinated ligands. In this article, we exclusively examine the electrophilic attack on coordinated ligands.
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    Hydrogenation of olefins
    (Institute of Chemistry Ceylon, 2021-04) Perera,K. Sarath D
    Hydrogenation of olefins is one of the simplest reactions, where two hydrogen atoms add across a carbon-carbon double bond to give an alkane.
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    Impact of marijuana on human brain
    (Institute of Chemistry Ceylon, 2024-05) Kumbalatara,Ushara. M; Perera,K. Sarath D
    Marijuana, which is commonly called “pot, weed or Mary Jane” is a flowering plant in the Cannabaceae family. Cannabaceae family includes about 170 different species distributed among 11 genera, such as, Cannabis, Humulum, Celtis, Aphananthe, Chaetachme, Gironniera, Lozanella, Parasponia, Pteroceltis, Moraceae and Trema.1
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    Infrared Spectroscopy
    (Institute of Chemistry Ceylon, 2022-06) Perera,K. Sarath D
    The energy of most of the molecular vibrations falls into the infrared region (4000 - 400 cm-1) of the electromagnetic spectrum.
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    Introduction to Coordination Chemistry
    (Institute of Chemistry Ceylon, 2022-09) Perera,K. Sarath D
    Coordination chemistry of transition metals is very important as it helps students to understand various industrial, chemical and biological processes.
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    Introduction to Heterocyclic Chemistry
    (Institute of Chemistry Ceylon, 2022-06) Perera,K. Sarath D
    Heterocycles are cyclic structures with at least one atom other than C and H. Most common heteroatoms are N, O and S. A large portion of natural products are heterocyclic compounds and some are being utilized as pharmaceuticals, agrochemicals etc.
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    Introduction to Polymer Chemistry
    (Institute of Chemistry Ceylon, 2022-09) Perera,K. Sarath D
    Polymers play an important role in our day-to-day life. In Greek, poly means “many” and mer means “parts”. Polysaccharides, proteins and nucleic acids are the main bio-polymers/macromolecules.
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    Introduction to Radiochemistry
    (Institute of Chemistry Ceylon, 2021-04) Perera,K. Sarath D
    An atom consists of a very small (about 10–10 m in radius), dense and positively charged nucleus and negatively charged electrons. The nucleus consists of protons (p) and neutrons (n); these two particles are collectively known as nucleons