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Titanium Isopropoxide
TITANIUM ISOPROPOXIDE, also commonly referred to as titanium tetraisopropoxide or TTIP, is a chemical compound with the formula Ti{OCH(CH3)2}4. This alkoxide of titanium(IV) is used in organic synthesis and materials science . It is a diamagnetic tetrahedral molecule. The structures of the titanium alkoxides are often complex. Crystalline titanium methoxide is tetrameric with the molecular formula Ti4(OCH3)16. Alkoxides derived from bulkier alcohols such as isopropanol aggregate less. Titanium
Titanium
isopropoxide is mainly a monomer in nonpolar solvents
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Hydrogen Chloride
The compound HYDROGEN CHLORIDE has the chemical formula H Cl and as such is a hydrogen halide . At room temperature , it is a colorless gas , which forms white fumes of hydrochloric acid upon contact with atmospheric water vapor . Hydrogen
Hydrogen
chloride gas and hydrochloric acid are important in technology and industry. Hydrochloric acid, the aqueous solution of hydrogen chloride, is also commonly given the formula HCl
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Sol-gel
In materials science , the SOL-GEL process is a method for producing solid materials from small molecules. The method is used for the fabrication of metal oxides , especially the oxides of silicon and titanium. The process involves conversion of monomers into a colloidal solution (sol) that acts as the precursor for an integrated network (or gel) of either discrete particles or network polymers . Typical precursors are metal alkoxides
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Acetic Acid
Acetamide Acetic anhydride
Acetic anhydride
Acetonitrile
Acetonitrile
Acetyl chloride
Acetyl chloride
Ethanol
Ethanol
Ethyl acetate
Ethyl acetate
Potassium acetate
Potassium acetate
Sodium acetate Thioacetic acid SUPPLEMENTARY DATA PAGE Structure and properties Refractive index
Refractive index
(n), Dielectric constant
Dielectric constant
(εr), etc. Thermodynamic data Phase behaviour solid–liquid–gas Spectral data UV , IR , NMR , MS Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa)
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Chirality (chemistry)
CHIRALITY /kaɪˈrælɪti/ is a geometric property of some molecules and ions. A chiral molecule/ion is non-superimposable on its mirror image . The presence of an asymmetric carbon center is one of several structural features that induce chirality in organic and inorganic molecules. The term chirality is derived from the Greek word for hand, χειρ (kheir). The mirror images of a chiral molecule/ion are called enantiomers or OPTICAL ISOMERS . Individual enantiomers are often designated as either right-handed or left-handed . Chirality is an essential consideration when discussing the stereochemistry in organic and inorganic chemistry . The concept is of great practical importance because most biomolecules and pharmaceuticals are chiral
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Molecular Formula
A CHEMICAL FORMULA is a way of expressing information about the proportions of atoms that constitute a particular chemical compound , using a single line of chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus (+) and minus (−) signs. These are limited to a single typographic line of symbols, which may include subscripts and superscripts. A chemical formula is not a chemical name , and it contains no words. Although a chemical formula may imply certain simple chemical structures, it is not the same as a full chemical structural formula . Chemical formulas can fully specify the structure of only the simplest of molecules and chemical substances , and are generally more limited in power than are chemical names and structural formulas. The simplest types of chemical formulas are called empirical formulas , which use letters and numbers indicating the numerical proportions of atoms of each type
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Tetramer
A TETRAMER (/ˈtɛtrəmər/ ) (tetra-, "four" + -mer, "parts") is an oligomer formed from four monomers or subunits . The associated propriety is called tetramery. An example from inorganic chemistry is titanium methoxide with the empirical formula Ti(OCH3)4, which is tetrameric in the solid state and has the molecular formula Ti4(OCH3)16. An example from organic chemistry is kobophenol A , a substance that is formed by combining four molecules of resveratrol . In biochemistry, it similarly refers to a biomolecule formed of four units, that are the same (homotetramer ), i.e. as in Concanavalin A
Concanavalin A
or different (heterotetramer ), i.e. as in hemoglobin . Hemoglobin
Hemoglobin
has 4 similar sub-units while immunoglobulins have 2 very different sub-units
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Chemical Compound
A CHEMICAL COMPOUND (or just COMPOUND if used in the context of chemistry ) is an entity consisting of two or more atoms , at least two from different chemical elements , which associate via chemical bonds . There are four types of compounds, depending on how the constituent atoms are held together: molecules held together by covalent bonds , ionic compounds held together by ionic bonds , intermetallic compounds held together by metallic bonds , and certain complexes held together by coordinate covalent bonds . Many chemical compounds have a unique numerical identifier assigned by the Chemical Abstracts Service (CAS): its CAS number . A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound, using the standard abbreviations for the chemical elements, and subscripts to indicate the number of atoms involved
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Materials Science
The interdisciplinary field of MATERIALS SCIENCE, also commonly termed MATERIALS SCIENCE AND ENGINEERING, involves the discovery and design of new materials, with an emphasis on solids . The intellectual origins of materials science stem from the Enlightenment , when researchers began to use analytical thinking from chemistry , physics , and engineering to understand ancient, phenomenological observations in metallurgy and mineralogy . Materials science
Materials science
still incorporates elements of physics, chemistry, and engineering. As such, the field was long considered by academic institutions as a sub-field of these related fields. Beginning in the 1940s, materials science began to be more widely recognized as a specific and distinct field of science and engineering, and major technical universities around the world created dedicated schools of the study
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Diamagnetic
DIAMAGNETIC materials are repelled by a magnetic field ; an applied magnetic field creates an induced magnetic field in them in the opposite direction, causing a repulsive force. In contrast, paramagnetic and ferromagnetic materials are attracted by a magnetic field. DIAMAGNETISM is a quantum mechanical effect that occurs in all materials; when it is the only contribution to the magnetism the material is called diamagnetic. In paramagnetic and ferromagnetic substances the weak diamagnetic force is overcome by the attractive force of magnetic dipoles in the material. The magnetic permeability of diamagnetic materials is less than μ0, the permeability of vacuum. In most materials diamagnetism is a weak effect which can only be detected by sensitive laboratory instruments, but a superconductor acts as a strong diamagnet because it repels a magnetic field entirely from its interior. Dimagnetic material interaction in magnetic field
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Acta Crystallographica B
ACTA CRYSTALLOGRAPHICA is a series of peer-reviewed scientific journals , with articles centred on crystallography , published by the International Union of Crystallography
Crystallography
(IUCr). Originally established in 1948 as a single journal called Acta Crystallographica, there are now six independent Acta Crystallographica titles: Acta Crystallographica Section A: Foundations and Advances , Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials , Acta Crystallographica Section C: Structural Chemistry , Acta Crystallographica Section D: Structural Biology , Acta Crystallographica Section E: Crystallographic Communications and Acta Crystallographica Section F: Structural Biology Communications . Acta Crystallographica has been noted for the high quality of the papers that it produces, as well as the large impact that its papers have had on the field of crystallography
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Digital Object Identifier
In computing, a DIGITAL OBJECT IDENTIFIER or DOI is a persistent identifier or handle used to uniquely identify objects, standardized by the ISO
ISO
. An implementation of the Handle System , DOIs are in wide use mainly to identify academic, professional, and government information, such as journal articles, research reports and data sets, and official publications though they also have been used to identify other types of information resources, such as commercial videos. A DOI aims to be "resolvable", usually to some form of access to the information object to which the DOI refers. This is achieved by binding the DOI to metadata about the object, such as a URL , indicating where the object can be found. Thus, by being actionable and interoperable, a DOI differs from identifiers such as ISBNs and ISRCs which aim only to uniquely identify their referents. The DOI system uses the indecs Content Model for representing metadata
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Henri B. Kagan
HENRI BORIS KAGAN (born 15 December 1930) is currently an Emeritus Professor at the Université Paris-Sud in France
France
. He is widely recognized as a pioneer in the field of asymmetric catalysis . His discoveries have had far-reaching impacts on the pharmaceutical industry . He graduated from the Sorbonne and École nationale supérieure de chimie de Paris and carried out his PhD under J. Jacques at the Collège de France
Collège de France
. Subsequently, he was a research associate with A. Horeau. He then moved to Université Paris-Sud , Orsay where he is emeritus professor. A landmark in his research was the development of C2-symmetric ligands, e.g., DIOP for asymmetric catalysis . This discovery led to the discovery of many related ligands that support catalysts used in a variety of practical applications
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Tetrahedron (journal)
TETRAHEDRON is a weekly peer-reviewed scientific journal covering the field of organic chemistry . According to the Journal Citation Reports , the journal has a 2014 impact factor of 2.641. Tetrahedron and Elsevier
Elsevier
, its publisher, support an annual symposium. In 2010, complaints were raised over its high subscription cost. CONTENTS * 1 Notable papers * 2 See also * 3 References * 4 External links NOTABLE PAPERSAs of 22 June 2013 , the Web of Science
Web of Science
lists ten papers from Tetrahedron that have more than 1000 citations. The four articles that have been cited more than 2000 times are: * Wiberg, K. B. (1968). "Application of pople-santry-segal CNDO method to the cyclopropylcarbinyl and cyclobutyl cation and to bicyclobutane". Tetrahedron. 24 (3): 1083. doi :10.1016/0040-4020(68)88057-3 . – cited 2228 times * Haasnoot, C. A. G.; de Leeuw, F. A. A. M.; Altona, C. (1980)
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Organic Syntheses
ORGANIC SYNTHESES is a peer-reviewed scientific journal that was established in 1921. It publishes detailed and checked procedures for the synthesis of organic compounds . A unique feature of the review process is that all of the data and experiments reported in an article must be successfully repeated in the laboratory of a member of the editorial board as a check for reproducibility prior to publication. The journal is published by Organic Syntheses, Inc., a non-profit corporation. An annual print version is published by John Wiley "> * ^ "Information for Authors". Organic Syntheses. * ^ R. L. Danheiser (2011). "Organic Syntheses: The "Gold Standard" in Experimental Synthetic Organic Chemistry" (PDF). Org. Synth. 88: 1–3. doi :10.15227/orgsyn.088.0001 . * ^ "About OrgSyn". * ^ A B C Shriner, Ralph L.; Shriner, Rachel H. (1975). "Part I. The Early History of Organic Syntheses". In Danheiser, R
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Special
SPECIAL or SPECIALS may refer to: CONTENTS * 1 Music * 2 Film and television * 3 Other uses * 4 See also MUSIC * Special (album) , a 1992 album by Vesta Williams * "Special" (Garbage song) , 1998 * "Special" (Mew song) , 2005 * "Special" (Stephen Lynch song) , 2000 * The Specials
The Specials
, a British band * "Special", a song by Violent Femmes on The Blind Leading the Naked * "Special", a song on
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