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Samaresh Mitra
Samaresh Mitra (born 1937) is an Indian bioinorganic chemist and an INSA Senior Scientist at the Indian Institute of Chemical Biology (IICB). He is known for his researches on inorganic paramagnetic complexes and low-symmetry transition metal complexes and is an elected fellow of the Indian National Science Academy, the National Academy of Sciences, India and the Indian Academy of Sciences. The Council of Scientific and Industrial Research, the apex agency of the Government of India for scientific research, awarded him the Shanti Swarup Bhatnagar Prize for Science and Technology, one of the highest Indian science awards, in 1983, for his contributions to chemical sciences. Biography Born on 17 March 1940 in the Indian state of West Bengal, Samaresh Mitra graduated in chemistry from Deen Dayal Upadhyay Gorakhpur University and completed his master's degree form the same institution. Enrolling for his doctoral studies in 1962 at Indian Association for the Cultivation of Science ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
West Bengal
West Bengal (, Bengali: ''Poshchim Bongo'', , abbr. WB) is a state in the eastern portion of India. It is situated along the Bay of Bengal, along with a population of over 91 million inhabitants within an area of . West Bengal is the fourth-most populous and thirteenth-largest state by area in India, as well as the eighth-most populous country subdivision of the world. As a part of the Bengal region of the Indian subcontinent, it borders Bangladesh in the east, and Nepal and Bhutan in the north. It also borders the Indian states of Odisha, Jharkhand, Bihar, Sikkim and Assam. The state capital is Kolkata, the third-largest metropolis, and seventh largest city by population in India. West Bengal includes the Darjeeling Himalayan hill region, the Ganges delta, the Rarh region, the coastal Sundarbans and the Bay of Bengal. The state's main ethnic group are the Bengalis, with the Bengali Hindus forming the demographic majority. The area's early history featured a succession ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemical Research Society Of India
Chemical Research Society of India (CRSI) is an India based scientific society dedicated to field of chemistry. It was established in 1999 as a part of celebrating India's 50th anniversary of independence. C. N. R. Rao Chintamani Nagesa Ramachandra Rao BR, (born 30 June 1934), is an Indian chemist who has worked mainly in solid-state and structural chemistry. He has honorary doctorates from 84 universities from around the world and has authored around 1,77 ... became its founder president and the organization currently has 1500 lifetime members. References {{authority control Chemistry societies Scientific organisations based in India 1999 establishments in Rajasthan Scientific organizations established in 1999 Organisations based in Rajasthan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Porphyrins
Porphyrins ( ) are a group of heterocyclic macrocycle organic compounds, composed of four modified pyrrole subunits interconnected at their α carbon atoms via methine bridges (=CH−). The parent of porphyrin is porphine, a rare chemical compound of exclusively theoretical interest. Substituted porphines are called porphyrins. With a total of 26 π-electrons, of which 18 π-electrons form a planar, continuous cycle, the porphyrin ring structure is often described as aromatic. One result of the large conjugated system is that porphyrins typically absorb strongly in the visible region of the electromagnetic spectrum, i.e. they are deeply colored. The name "porphyrin" derives from the Greek word πορφύρα (''porphyra''), meaning ''purple''. Complexes of porphyrins Concomitant with the displacement of two N-''H'' protons, porphyrins bind metal ions in the N4 "pocket". The metal ion usually has a charge of 2+ or 3+. A schematic equation for these syntheses is shown: :H2porphyr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phthalocyanine
Phthalocyanine () is a large, aromatic, macrocyclic, organic compound with the formula and is of theoretical or specialized interest in chemical dyes and photoelectricity. It is composed of four isoindole units linked by a ring of nitrogen atoms. = has a two-dimensional geometry and a ring system consisting of 18 π-electrons. The extensive delocalization of the π-electrons affords the molecule useful properties, lending itself to applications in dyes and pigments. Metal complexes derived from , the conjugate base of , are valuable in catalysis, organic solar cells, and photodynamic therapy. Properties Phthalocyanine and derived metal complexes (MPc) tend to aggregate and, thus, have low solubility in common solvents. Benzene at 40 °C dissolves less than a milligram of or CuPc per litre. and CuPc dissolve easily in sulfuric acid due to the protonation of the nitrogen atoms bridging the pyrrole rings. Many phthalocyanine compounds are, thermally, very stabl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnetochemistry
Magnetochemistry is concerned with the magnetic properties of chemical compounds. Magnetic properties arise from the spin and orbital angular momentum of the electrons contained in a compound. Compounds are diamagnetic when they contain no unpaired electrons. Molecular compounds that contain one or more unpaired electrons are paramagnetic. The magnitude of the paramagnetism is expressed as an effective magnetic moment, μeff. For first-row transition metals the magnitude of μeff is, to a first approximation, a simple function of the number of unpaired electrons, the spin-only formula. In general, spin-orbit coupling causes μeff to deviate from the spin-only formula. For the heavier transition metals, lanthanides and actinides, spin-orbit coupling cannot be ignored. Exchange interaction can occur in clusters and infinite lattices, resulting in ferromagnetism, antiferromagnetism or ferrimagnetism depending on the relative orientations of the individual spins. Magnetic susceptibil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bimolecular
In chemistry, molecularity is the number of molecules that come together to react in an elementary (single-step) reactionAtkins, P.; de Paula, J. Physical Chemistry. Oxford University Press, 2014 and is equal to the sum of stoichiometric coefficients of reactants in the elementary reaction with effective collision ( sufficient energy) and correct orientation. Depending on how many molecules come together, a reaction can be unimolecular, bimolecular or even trimolecular. The kinetic order of any elementary reaction or reaction step is ''equal'' to its molecularity, and the rate equation of an elementary reaction can therefore be determined by inspection, from the molecularity. The kinetic order of a complex (multistep) reaction, however, is not necessarily equal to the number of molecules involved. The concept of molecularity is only useful to describe elementary reactions or steps. Unimolecular reactions In a unimolecular reaction, a single molecule rearranges atoms, forming ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tezpur University
Tezpur University is a Central University located in Tezpur in the North-Eastern state of Assam, India, established by an act of Parliament, in 1994. History The establishment of Tezpur University is considered to be one of the outcomes of the Assam Accord, along with the establishment of Assam University and Indian Institute of Technology Guwahati. Tezpur University was established, by an Act of Parliament, in 1994. The then prime minister of India, P. V. Narasimha Rao, chaired the opening of the university. Initially, the university operated from the premises of the Darrang College, in Tezpur. For a while, it also operated from the Tezpur Law College premises. Land was acquired at Napaam, a suburb, which is about east of Tezpur, area totalling . A few months later, the premises of the university was shifted to the present permanent location. Kalaguru Bishnuprasad Rava (Rabha) donated an ancestral estate of 2500 bigha of land received from the British government in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deen Dayal Upadhyay Gorakhpur University
DDU Gorakhpur University (simply known as University of Gorakhpur) is located in Gorakhpur, Uttar Pradesh. The University of Gorakhpur is a teaching and residential-cum-affiliating University. It is about . from the downtown to the east and almost walking distance from railway station to the south. History Although the idea of residential University at Gorakhpur was first mooted by C.J. Rao, the then Principal of St. Andrews College, then under Agra University, who initiated post-graduate and undergraduate science teaching in his college, the idea got crystallized and took concrete shape by the untiring efforts of S. N. M.Tripathi. The proposal was accepted in principle by the first Chief Minister of U.P., Gobind Ballabh Pant, but it was only in 1956 that the university came into existence by an act passed by the U.P. Legislature. It actually started functioning since 1 September 1957, when the faculties of Arts, Commerce, Law and Education were started. In the following year ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
