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Azide Complex
Transition metal azide complexes are coordination complexes containing one or more azide (N3−) ligands. In addition to coordination complexes, this article summarizes homoleptic transition metal azides, which are often coordination polymers. Structure and bonding Azide is a pseudohalide but more nucleophilic than chloride, as reflected by the higher pKa of hydrazoic acid (4.6) vs hydrochloric acid (-5.9). As a monodentate ligand, azide binds through one of the two terminal nitrogen atoms, i.e. M-N=N=N. Azide is a "pure" sigma donor. It is classified as an X ligand in the Covalent bond classification method. In the usual electron counting method, it is a one-electron ligand. The N3 unit is linear or nearly so. The M-N-N angles are quite bent. Azide functions as a bridging ligand via two bonding modes. Commonly the metals share the same nitrogen ("N-diazonium" mode). Less common is the motif M-N=N=N-M, illustrated by u(N3)(PPh3)2sub>2. General synthetic methods Traditi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CSD CIF RIJLAX
CSD may refer to: Finance * Central securities depository * Confederate States Dollar * Serbian dinar The dinar (, ; paucal: dinara / динара; Currency symbol, abbreviation: DIN (Gaj's Latin alphabet, Latin) and дин (Serbian Cyrillic alphabet, Cyrillic); ISO 4217, code: RSD) is the currency of Serbia. The dinar was first used in Serbia in ..., by previous ISO 4217 code Organizations Education * California School for the Deaf (other), several institutions * Canyons School District, in Utah, US * Cheltenham School District, in Pennsylvania, US * Christina School District, in Delaware, US * Cleveland School District, in Mississippi, US * Cordova School District, in Alaska, US Other organizations * Canteen Stores Department (India), a chain of stores operated by the Indian Ministry of Defence at military bases * CSD Pakistan (Canteen Stores Department), a chain of stores operated by the Pakistani Ministry of Defence * Chartered Society of Designers, a British l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Binary Compound
In materials chemistry, a binary phase or binary compound is a chemical compound containing two different elements. Some binary phase compounds are molecular, e.g. carbon tetrachloride (CCl4). More typically binary phase refers to extended solids. Famous examples zinc sulfide Zinc sulfide (or zinc sulphide) is an inorganic compound with the chemical formula of ZnS. This is the main form of zinc found in nature, where it mainly occurs as the mineral sphalerite. Although this mineral is usually black because of various i ..., which contains zinc and sulfur, and tungsten carbide, which contains tungsten and carbon. Phases with higher degrees of complexity feature more elements, e.g. three elements in ternary phases, four elements in quaternary phases. These phases exhibit a higher degree of complexity due to the interaction of these elements at different conditions. References Chemical compounds {{chem-compound-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2,2′-Bipyridine
2,2′-Bipyridine (bipy or bpy, pronounced ) is an organic compound with the formula . This colorless solid is an important isomer of the bipyridine family. It is a bidentate chelation, chelating ligand, forming complexes with many transition metals. Ruthenium and platinum complexes of bipy exhibit intense luminescence. Preparation, structure, and general properties 2,2'-Bipyridine was first prepared by decarboxylation of divalent metal derivatives of Pyridine-2-carboxylic acid, pyridine-2-carboxylate: It is prepared by the dehydrogenation of pyridine using Raney nickel: Substituted 2,2'-bipyridines Unsymmetrically substituted 2,2'-bipyridines can be prepared by cross coupling reaction of 2-pyridyl and substituted pyridyl reagents. Structure Although bipyridine is often drawn with its nitrogen atoms in ''cis'' conformation, the lowest energy conformation both in solid state and in solution is in fact coplanar, with nitrogen atoms in ''trans'' position. Monoprotonated bipyrid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Binding Modes
Binding may refer to: Computing * Binding, associating a network socket with a local port number and IP address * Data binding, the technique of connecting two data elements together ** UI data binding, linking a user interface element to an element of a domain model, such as a database field ** XML data binding, representing XML document data using objects and classes * Key binding, or keyboard shortcut, mapping key combinations to software functionality * Language binding, a library providing a functional interface to second library in a different programming language * Name binding, the association of code or data with an identifier in a programming language ** Late binding, name binding which is resolved at run-time rather than in pre-execution time Science * Binding problem, a term for several problems in cognitive science and philosophy ** Neural binding, synchronous activity of neurons and neuronal ensembles * Molecular binding, an attractive interaction between two mole ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parent Structure
In chemistry, a parent structure is the structure of an unadorned ion or molecule from which derivatives can be visualized. Parent structures underpin systematic nomenclature and facilitate classification. Fundamental parent structures have one or no functional groups and often have various types of symmetry. Benzene () is a chemical itself consisting of a hexagonal ring of carbon atoms with a hydrogen atom attached to each, and is the parent of many derivatives that have substituent atoms or groups replacing one or more of the hydrogens. Some parents are rare or nonexistent themselves, as in the case of porphine, though many simple and complex derivatives are known. File:Benzene circle.png, Benzene is the parent. File:Toluene-vec.svg, Toluene is a derivative of benzene. File:Porphyrin.svg, Porphine is the parent of porphyrins. File:PPIXtransH.png, Protoporphyrin IX is a natural derivative of the parent porphine. File:H2octaethylporphyrin.png, Octaethylporphyrin is a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Single-crystal X-ray Crystallography
X-ray crystallography is the experimental science of determining the atomic and molecular structure of a crystal, in which the crystalline structure causes a beam of incident X-rays to diffract in specific directions. By measuring the angles and intensities of the X-ray diffraction, a crystallographer can produce a three-dimensional picture of the density of electrons within the crystal and the positions of the atoms, as well as their chemical bonds, crystallographic disorder, and other information. X-ray crystallography has been fundamental in the development of many scientific fields. In its first decades of use, this method determined the size of atoms, the lengths and types of chemical bonds, and the atomic-scale differences between various materials, especially minerals and alloys. The method has also revealed the structure and function of many biological molecules, including vitamins, drugs, proteins and nucleic acids such as DNA. X-ray crystallography is still the primar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
