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  • Ratnaweera, Chinthaka Nadun (Institute of Chemistry Ceylon, 2022-06)
    In the previous article we learnt how fixed values of hyperfine transition frequency of Cs, speed of light, Planck constant, and Avogadro constant are used to define SI units of time, length, mass and amount of substances ...
  • Perera, K.Sarath.D (Institute of Chemistry Ceylon, 2022-06)
    Molecules have different energy states: electronic, vibrational, rotational, and nuclear. Quantized energy is responsible for each transition (e.g., rotational - microwaves, infrared - vibrational) within the ...
  • Perera, K.Sarath.D. (Institute of Chemistry Ceylon, 2022-06)
    The energy of most of the molecular vibrations falls into the infrared region (4000 - 400 cm-1) of the electromagnetic spectrum. Infrared (IR) or vibrational spectroscopy is used by organic chemists to: (i) identify functional ...
  • Perera, K.Sarath.D. (Institute of Chemistry Ceylon, 2022-06)
    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 ...
  • Perera, K. Sarath. D. (Institute of Chemistry Ceylon, 2020-09)
    Reductive elimination (R.E.) is the opposite or the reverse of oxidative addition (O.A.), in which X-Y oxidatively adds on to Ln Mn+ to give Ln (X)(Y)M(n+2)+. LnM Y (n+2)+ X R.E. O.A. LnM n+ + X Y X and Y ...
  • Perera, K. Sarath. D. (Institute of Chemistry Ceylon, 2020-05)
    Coordinatively unsaturated metal centres (Mn+) (valence electron count, VEC<18) may undergo oxidative addition reactions to form saturated metal complexes by cleaving the X-Y bond of a molecule (e.g. H2 , O2 , ...
  • Perera, K. Sarath. D. (Institute of Chemistry Ceylon, 2020-05)
    A good knowledge in coordination and organometallic chemistry is very useful to a student, who wish to understand chemical transformations taking place around in nature and industry. It also helps to design synthetic ...
  • Perera, K. Sarath. D. (Institute of Chemistry Ceylon, 2020-01)
    Metal centres of d-block form coordination compounds with ligands which can donate a pair of electrons. These ligands are known as sigma donors or Lewis bases. Some ligands that consist of suitable vacant orbitals ...
  • Perera, K. Sarath. D. (Institute of Chemistry Ceylon, 2020-01)
    Isomers (compounds with the same chemical formula) can be broadly classified into (i) stereoisomers (e.g. geometrical and optical) with the same connectivity but having different spatial arrangements and (ii) structural ...
  • Perera, K. Sarath. D. (Institute of Chemistry Ceylon, 2021-09)
    Organic chemistry is basically the study of synthesis, reactions, properties, and structures of carbon-containing compounds. Organic reactions can be classified into four main types: addition, elimination (E), substitution, ...
  • Haniffa, M.R.M. (Institute of Chemistry Ceylon, 2021-09)
    Let me at the outset, share my thoughts with you regarding basic mathematics and its teaching. It is based on my teaching experience over the past couple of decades and based on what I learned for my O/L
  • Ratnaweera, Chinthaka Nadun (Institute of Chemistry Ceylon, 2021-09)
    Let’s begin with something everyone knows, SI units! Everyone of us applies them, but do you know the concept behind its definitions? Very recently definitions of SI units were changed and they are now defined by ...
  • Perera, K. Sarath. D. (Institute of Chemistry Ceylon, 2021-09)
    Arenes are aromatic compounds which can act These complexes with three simple ligands are called as π-electron donors. Organometallic complexes with such ligands are commonly known as arene complexes, arene metal complexes ...
  • Perera, K.Sarath. D. (Institute of Chemistry Ceylon, 2021-09)
    Nuclear Magnetic Resonance spectroscopy is probably the most powerful tool available for structure determination of organic, inorganic and organometallic compounds. It is also used by chemists to study mechanisms, ...
  • Perera, K. Sarath. D. (Institute of Chemistry, 2021-06)
    Mass spectrometry is an analytical technique used to obtain information on the structure and molecular weight/accurate mass of a given compound. The main components of the mass spectrometer are the ion source, mass ...
  • Perera, K. Sarath. D. (Institute of Chemistry, 2021-06)
    In 1960, chemists at BASF developed the carbonylation of methanol into acetic acid. CH3 OH + CO CH3 COOH Monsanto process Monsanto Company introduced a new catalytic system in 1966. It is now known as the Monsanto ...
  • Perera, K. Sarath. D. (Institute of Chemistry, 2021-06)
  • Perera, K. Sarath. D. (Institute of Chemistry Ceylon, 2021-04)
    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); ...
  • Perera, K. Sarath. D. (Institute of Chemistry Ceylon, 2021-04)
    We know that main group hydrides such as LiAlH4 and NaBH4 are the common reducing agents used by organic chemists to reduce aldehydes, ketones and carboxylic acids. Transition metal hydrides act as ...
  • Perera, K. Sarath. D. (Institute of Chemistry Ceylon, 2021-04)
    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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