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(Institue of Chemistry Ceylon, 2023-06)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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(Institute of chemistry Ceylon, 2023-06)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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(Institute of chemistry Ceylon, 2023-06)Boron hydrides are a class of electron deficient compounds that have unusual bonding behavior and form cages and clusters. The electron deficient BH3 is the simplest boron hydride which exists as a dimer B2 H6 ...
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(Institute of chemistry Ceylon, 2023-06)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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(Institute of chemistry Ceylon, 2023-06)Diels-Alder (D-A) reaction is a (4π+2π) cycloaddition reaction. It is used to generate six-membered rings by combining two π-systems. The key components of this reaction are a conjugated diene (an alkene with two π-bonds) ...
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(Institute of Chemistry Ceylon, 2023-01)Organic reactions are chemical processes that involve organic substances. The fundamental types of organic chemistry reactions include substitution reactions, elimination reactions, addition reactions, redox ...
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(Institute of Chemistry Ceylon, 2023-01)Chromatographic methods are recognized as the most powerful analytical separation techniques to date, for the identification and separation of complex mixtures of chemical compounds.
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(Institute of Chemistry Ceylon, 2023-01)Palladium complexes catalyze many types of organic reactions. It is particularly useful in forming carbon- carbon bonds.
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(Institute of Chemistry Ceylon, 2023-01)An alkyl-metal complex has at least one Metal Carbon (M-C) σ- or π-bond. Grignard reagent (RMgX) and LiR are the most common alkyl-metal reagents used in organic synthesis.
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(Institute of Chemistry Ceylon, 2023-01)Free radicals can be defined as chemical species (atom, molecule or ion) which have a single unpaired valence electron.
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(Institute of chemistry Ceylon, 2022-10)Metathesis of simple salts is a double replacement reaction as shown below. AX + BY → AY + BX In Greek, “Metathesis” is known as the change of position or transposition. Olefin metathesis (OM) is the catalytic scission ...
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(Institute of chemistry Ceylon, 2022-10)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. A large number of industries ...
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(Institute of chemistry Ceylon, 2022-10)Coordination chemistry of transition metals is very important as it helps students to understand various industrial, chemical and biological processes. Hemoglobin and chlorophyll are the two most important compounds ...
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(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 ...
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(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 ...
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(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 ...
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(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 ...
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(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 ...
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(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 , ...
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(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 ...