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Erich Clar
Erich Clar (23 August 1902 in Hřensko – 27 March 1987 in Estepona) was an Austrian organic chemist who studied polycyclic aromatic hydrocarbon chemistry. He is considered as the father of that field. In 1941, he authored "Aromatische Kohlenwasserstoffe" (Springer-Verlag) and in 1964 the greatly expanded two-volume ''Polycyclic Hydrocarbons'', which described the syntheses, properties, and UV-visible absorption spectra of hundreds of PAHs. He discovered the Clar reaction of the cyclic ketone perinaphthenone to form dibenzo d,lmerylene in a 400 C melt of zinc dust, zinc (II) chloride, and sodium chloride. He created the Sextet Theory, now eponymously called ''Clar's rule'', to describe the behavior of polycyclic aromatic hydrocarbon isomers. This was described in his book ''The Aromatic Sextet''. He was awarded the August Kekulé Medal by the Chemical Society of the GDR in 1965, the highest award given by that society to foreign scientists, and the first Polycyclic Aromatic Hydroc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hřensko
Hřensko (german: Herrnskretschen) is a municipality and village in Děčín District in the Ústí nad Labem Region of the Czech Republic. It has about 300 inhabitants. Administrative parts The village of Mezná is an administrative part of Hřensko. Geography Hřensko is located about north of Děčín. It lies on the border with Germany and is adjacent to Bad Schandau and Schöna. Hřensko is situated at the confluence of the Kamenice and Elbe rivers, in the Elbe valley. In the municipal territory is located the lowest point of the Czech Republic, which is the Elbe on the border with Germany with above the sea. Hřensko lies in the Elbe Sandstone Mountains. Most of the municipality lies in the Bohemian Switzerland National Park. The highest point of the municipality is Oltářní kámen with above the sea. History Hřensko was established during the 15th century as a trading settlement. Transport There are two border crossings in Hřensko: the road border crossing '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1902 Births
Nineteen or 19 may refer to: * 19 (number), the natural number following 18 and preceding 20 * one of the years 19 BC, AD 19, 1919, 2019 Films * ''19'' (film), a 2001 Japanese film * ''Nineteen'' (film), a 1987 science fiction film Music * 19 (band), a Japanese pop music duo Albums * ''19'' (Adele album), 2008 * ''19'', a 2003 album by Alsou * ''19'', a 2006 album by Evan Yo * ''19'', a 2018 album by MHD * ''19'', one half of the double album ''63/19'' by Kool A.D. * ''Number Nineteen'', a 1971 album by American jazz pianist Mal Waldron * ''XIX'' (EP), a 2019 EP by 1the9 Songs * "19" (song), a 1985 song by British musician Paul Hardcastle. * "Nineteen", a song by Bad4Good from the 1992 album '' Refugee'' * "Nineteen", a song by Karma to Burn from the 2001 album ''Almost Heathen''. * "Nineteen" (song), a 2007 song by American singer Billy Ray Cyrus. * "Nineteen", a song by Tegan and Sara from the 2007 album '' The Con''. * "XIX" (song), a 2014 song by Slipkn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Academics Of The University Of Glasgow
An academy ( Attic Greek: Ἀκαδήμεια; Koine Greek Ἀκαδημία) is an institution of secondary or tertiary higher learning (and generally also research or honorary membership). The name traces back to Plato's school of philosophy, founded approximately 385 BC at Akademia, a sanctuary of Athena, the goddess of wisdom and skill, north of Athens, Greece. Etymology The word comes from the ''Academy'' in ancient Greece, which derives from the Athenian hero, '' Akademos''. Outside the city walls of Athens, the gymnasium was made famous by Plato as a center of learning. The sacred space, dedicated to the goddess of wisdom, Athena, had formerly been an olive grove, hence the expression "the groves of Academe". In these gardens, the philosopher Plato conversed with followers. Plato developed his sessions into a method of teaching philosophy and in 387 BC, established what is known today as the Old Academy. By extension, ''academia'' has come to mean the accumulatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
People From Děčín District
A person ( : people) is a being that has certain capacities or attributes such as reason, morality, consciousness or self-consciousness, and being a part of a culturally established form of social relations such as kinship, ownership of property, or legal responsibility. The defining features of personhood and, consequently, what makes a person count as a person, differ widely among cultures and contexts. In addition to the question of personhood, of what makes a being count as a person to begin with, there are further questions about personal identity and self: both about what makes any particular person that particular person instead of another, and about what makes a person at one time the same person as they were or will be at another time despite any intervening changes. The plural form "people" is often used to refer to an entire nation or ethnic group (as in "a people"), and this was the original meaning of the word; it subsequently acquired its use as a plural form of per ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Organic Chemists
Organic may refer to: * Organic, of or relating to an organism, a living entity * Organic, of or relating to an anatomical organ Chemistry * Organic matter, matter that has come from a once-living organism, is capable of decay or is the product of decay, or is composed of organic compounds * Organic compound, a compound that contains carbon ** Organic chemistry, chemistry involving organic compounds Farming, certification and products * Organic farming, agriculture conducted according to certain standards, especially the use of stated methods of fertilization and pest control * Organic certification, accreditation process for producers of organically-farmed products * Organic horticulture, the science and art of growing fruits, vegetables, flowers, or ornamental plants by following the essential principles of organic agriculture * Organic products, "organics": ** Organic food, food produced from organic farming methods and often certified organic according to organic farming sta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1987 Deaths
File:1987 Events Collage.png, From top left, clockwise: The MS Herald of Free Enterprise capsizes after leaving the Port of Zeebrugge in Belgium, killing 193; Northwest Airlines Flight 255 crashes after takeoff from Detroit Metropolitan Airport, killing everyone except a little girl; The King's Cross fire kills 31 people after a fire under an escalator Flashover, flashes-over; The MV Doña Paz sinks after colliding with an oil tanker, drowning almost 4,400 passengers and crew; Typhoon Nina (1987), Typhoon Nina strikes the Philippines; LOT Polish Airlines Flight 5055 crashes outside of Warsaw, taking the lives of all aboard; The USS Stark is USS Stark incident, struck by Iraq, Iraqi Exocet missiles in the Persian Gulf; President of the United States, U.S. President Ronald Reagan gives a famous Tear down this wall!, speech, demanding that Soviet Union, Soviet leader Mikhail Gorbachev tears down the Berlin Wall., 300x300px, thumb rect 0 0 200 200 Zeebrugge disaster rect 200 0 400 200 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iptycene
An iptycene is an aromatic compound composed of varying number of arene subunits bound to a bridged bicyclo-octatriene core structure. They are formally derivatives of barrelene. The first and simplest iptycene molecule is triptycene. The first iptycene was reported in 1931 by Erich Clar Erich Clar (23 August 1902 in Hřensko – 27 March 1987 in Estepona) was an Austrian organic chemist who studied polycyclic aromatic hydrocarbon chemistry. He is considered as the father of that field. In 1941, he authored "Aromatische Kohlenwasser .... Paul Bartlett's research group developed Clar's method and made the first triptycene. Following Bertlett's work on triptycene, Hart et al., with acknowledgement to Professor Joel F. Liebman, proposed the trivial name ''iptycene'' for this class of molecules. References Polycyclic aromatic hydrocarbons {{aromatic-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Estepona
Estepona () is a town and municipality in the comarca of the Costa del Sol, southern Spain. It is located in the province of Málaga, part of the autonomous community of Andalusia. Its district covers an area of 137 square kilometers in a fertile valley crossed by small streams and a mountainous areas dominated by the Sierra Bermeja, which reaches an elevation of 1,449 m at the peak of Los Reales. Estepona is renowned for its beaches, which stretch along some 21 km of coastline. It is a popular resort and holiday destination. Due to its natural environment, surrounded by the sea and the mountains, Estepona has a micro-climate with over 325 days of sunshine per year. Estepona is a popular year-round holiday destination; it has two EC Blue Flag beaches, a modern sports marina with many tapas bars and restaurants. The white-walled town centre has many shops and picturesque squares. In the early 1990s, the Walt Disney Company chose Estepona as the original site for its Eurodisn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triangulene
Triangulene (also known as Clar's hydrocarbon) is the smallest Triplet state, triplet-ground-state Polycyclic aromatic hydrocarbon, polybenzenoid. It exists as a biradical with the chemical formula . It was first hypothesized by Czech Republic, Czech chemist Erich Clar in 1953. Its first confirmed synthesis was published in a February 2017 issue of ''Nature Nanotechnology'', in a project led by researchers David Fox and Anish Mistry at the University of Warwick in collaboration with IBM. Other attempts by Japanese researchers have been successful only in making substituted triangulene derivatives. A six-step synthesis yielded two isomers of dihydrotriangulene which were then deposited on xenon or copper base. The researchers used a combined Scanning tunneling microscope, scanning tunneling and Atomic-force microscopy, atomic force microscope (STM/AFM) to remove individual hydrogen atoms. The synthesized molecule of triangulene remained stable at high-vacuum low-Cryogenics, tempera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemical Society Of The GDR
A chemical substance is a form of matter having constant chemical composition and characteristic properties. Some references add that chemical substance cannot be separated into its constituent elements by physical separation methods, i.e., without breaking chemical bonds. Chemical substances can be simple substances (substances consisting of a single chemical element), chemical compounds, or alloys. Chemical substances are often called 'pure' to set them apart from mixtures. A common example of a chemical substance is pure water; it has the same properties and the same ratio of hydrogen to oxygen whether it is isolated from a river or made in a laboratory. Other chemical substances commonly encountered in pure form are diamond (carbon), gold, table salt (sodium chloride) and refined sugar (sucrose). However, in practice, no substance is entirely pure, and chemical purity is specified according to the intended use of the chemical. Chemical substances exist as solids, liquids, g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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