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Recently, extremely large benzenoid hydrocarbons have been synthesized. These compounds resemble graphite in many ways, and have been named graphenes. Because of their nonstandard properties, graphenes have already found numerous applications, especially as special-purpose materials in electronics. In this article we outline the basic chemical facts on graphenes.
Gopalpur Nagendrappa teaches organic chemistry at Bangalore University. His work includes organic synthesis and reaction mechanisms mainly in the area of organosilicon chemistry.
Ever since its isolation in 1820, Quinine has played a crucial role in the development of organic chemistry, chemical industry and modern medicine. The total synthesis of quinine, widely regarded as anevent of epochal importancewas claimed by Woodward and Doering in 1945. This work, however, heavily relied on unsubstantiated literature reports and it appears that Woodward’s work fell short of a total...
Reichardt’s dye A, shows spectacular solvatochromism having solutions coloured red in methanol, violet in ethanol, blue in isopropyl alcohol, green in acetone and greenish-yellow in anisole.
Polymers that exhibit high electrical conductivity have successfully been synthesized in the last few decades. The early problems associated with the stability and solubility of such conducting polymers have largely been overcome using chemical intuition and experimentation. A fairly wide range of interesting applications based on these polymers is emerging; some of these are highlighted in this article.
Those of us who owe our living in part to the global dyestuff and chemical industry should pause today and remember the beginnings of this giant industry which started 150 years ago today with William Perkins’ discovery of mauveine whilst working in his home laboratory during the Easter holiday on April 28, 1856. Prior to this discovery, all textiles were dyed with natural dyestuffs and pigments.
The intensity of solar radiation in the Earth’s direction from the Sun is approximately 1.361 kW/m2, a number also called the ‘solar constant’. Accordingly, it is estimated that the power Earth receives is about 96 billion kilowatts from the Sun each second. If this colossal and unlimited energy could be more fully utilized, our dependence on fast dwindling fossil cache will be drastically reduced...
In this section of Resonance, we invite readers to pose questions likely to be raised in a classroom situation. We may suggest strategies for dealing with them, or invite responses, or both. “Classroom” is equally a forum for raising broader issues and sharing personal experiences and viewpoints on matters related to teaching and learning science.
Vitamin B12 is an important coordination compound in biology. It is an interesting biomolecule in the sense that no other vitamin contains a metal ion. This is the only naturally occurring organometallic compound found in biology. An intriguing aspect of vitamin B12 is the great stability of the metal-carbon bond. A great deal of new and interesting inorganic chemistry has been uncovered while studying...
Gopalpur Nagendrappa teaches organic chemistry at Bangalore University. His work includes organic synthesis and reaction mechanisms mainly in the area of organosilicon chemistry.
The use of single crystal X-ray diffraction to determine the structure of a chemical compound has been historically classified as ‘Chemical Crystallography’. The methodologies, the accuracy in experiments coupled with the modern computer gadgets and advances in technology makes this branch of science an unequivocal provider of accurate and precise measurements of molecular dimensions. Structure determination...
The novel ‘solution combustion method’ or ‘fire synthesis’ has been used to make high temperature synthesised ceramic materials. The process, which can be initiated at low temperature, is self-propagating and gas-producing. Fine-particle alumina and its related oxides can be easily prepared in bulk by the redox mixture method.
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