Research
In one contribution, Cummins and coworkers described routes to simple phosphorus compounds including a low temperature route to diphosphorus: [17]
Kit Cummins | |
|---|---|
| Born | Christopher Colin Cummins February 28, 1966 Boston, Massachusetts, US |
| Alma mater | |
| Awards |
|
| Scientific career | |
| Fields | Inorganic Chemistry, Main Group Chemistry |
| Institutions | Massachusetts Institute of Technology |
| Thesis | Synthetic investigations featuring amidometallic complexes (1993) |
| Doctoral advisor | Richard R. Schrock |
| Other academic advisors | Peter T. Wolczanski |
| Doctoral students | Brandi Cossairt, Jonas C. Peters |
| Other notable students |
|
| Website | ccclab |
Christopher "Kit" Colin Cummins (born February 28, 1966) is an American chemist, currently the Henry Dreyfus Professor at the Massachusetts Institute of Technology. He has made contributions to the coordination chemistry of transition metal nitrides, phosphides, and carbides. [2] [3]
Cummins was born in Boston, Massachusetts, on February 28, 1966.[ citation needed ] He attended Middlebury College and Stanford University before transferring to Cornell University where he performed undergraduate research under the direction of Peter T. Wolczanski. [4] At Cornell, Cummins conducted research on the reactivity of low-coordinate zirconium and titanium complexes bearing bulky silanamide ligands (tBu3SiNH−), with small molecules such as methane, benzene, and carbon monoxide. [5] [6] [7]
After graduating from Cornell with an AB degree in 1989, Cummins went to the Massachusetts Institute of Technology to obtain his PhD in chemistry in 1993 under the direction of Richard R. Schrock. [8] Cummins conducted doctoral research on the synthesis of low-coordinate transition metal complexes bearing trialkylsilated variants of the tris(2-aminoethyl)amine ligand. [9] [10] [11] [12] [13] In collaboration with Robert E. Cohen, he also discovered a new technique for synthesizing nanoclusters of metal sulfide semiconductors within block copolymer microdomains. [14] [15]
After receiving his PhD in 1993, Cummins was invited to stay at MIT as an assistant professor and was later promoted to full professor in 1996. Cummins became the Henry Dreyfus Professor in Chemistry in 2015. [16]
In one contribution, Cummins and coworkers described routes to simple phosphorus compounds including a low temperature route to diphosphorus: [17]
In 2007, Cummins was awarded the 2007 Raymond and Beverly Sackler Prize in the Physical Sciences by Tel Aviv University [18] and the 2007 F. Albert Cotton Award by the American Chemical Society. [19]
In 2008, Cummins was elected a fellow of the American Academy of Arts & Sciences. [20]
In 2013, Cummins was awarded the Ludwig Mond Award by the Royal Society of Chemistry. [21]
In 2017, Cummins was elected as a member of the National Academy of Sciences. [22] In the same year, the American Chemical Society awarded Cummins the 2017 Linus Pauling Medal in recognition of his synthetic and mechanistic studies of early-transition metal complexes. [23]
In organic chemistry, olefin metathesis is an organic reaction that entails the redistribution of fragments of alkenes (olefins) by the scission and regeneration of carbon-carbon double bonds. Because of the relative simplicity of olefin metathesis, it often creates fewer undesired by-products and hazardous wastes than alternative organic reactions. For their elucidation of the reaction mechanism and their discovery of a variety of highly active catalysts, Yves Chauvin, Robert H. Grubbs, and Richard R. Schrock were collectively awarded the 2005 Nobel Prize in Chemistry.
A transition metal carbene complex is an organometallic compound featuring a divalent organic ligand. The divalent organic ligand coordinated to the metal center is called a carbene. Carbene complexes for almost all transition metals have been reported. Many methods for synthesizing them and reactions utilizing them have been reported. The term carbene ligand is a formalism since many are not derived from carbenes and almost none exhibit the reactivity characteristic of carbenes. Described often as M=CR2, they represent a class of organic ligands intermediate between alkyls (−CR3) and carbynes (≡CR). They feature in some catalytic reactions, especially alkene metathesis, and are of value in the preparation of some fine chemicals.
Robert Howard GrubbsForMemRS was an American chemist and the Victor and Elizabeth Atkins Professor of Chemistry at the California Institute of Technology in Pasadena, California. He was a co-recipient of the 2005 Nobel Prize in Chemistry for his work on olefin metathesis.
Richard Royce Schrock is an American chemist and Nobel laureate recognized for his contributions to the olefin metathesis reaction used in organic chemistry.
1,2,3,4,5-Pentamethylcyclopentadiene is a cyclic diene with the formula C5(CH3)5H, often written C5Me5H, where Me is CH3. It is a colorless liquid.
Ammonia borane, also called borazane, is the chemical compound with the formula H3NBH3. The colourless or white solid is the simplest molecular boron-nitrogen-hydride compound. It has attracted attention as a source of hydrogen fuel, but is otherwise primarily of academic interest.
Diphosphorus is an inorganic chemical with the chemical formula P
2. Unlike nitrogen, its lighter pnictogen neighbor which forms a stable N2 molecule with a nitrogen to nitrogen triple bond, phosphorus prefers a tetrahedral form P4 because P-P pi-bonds are high in energy. Diphosphorus is, therefore, very reactive with a bond-dissociation energy (117 kcal/mol or 490 kJ/mol) half that of dinitrogen. The bond distance has been measured at 1.8934 Å.
Sodium silox is the name for an organosilicon compound that serves as a source of the siloxide anion [(CH3)3C]3SiO−. Complexes of this bulky anionic ligand often adopt with low coordination numbers. Examples include Ti(silox)3, Nb(silox)3(PMe3), and [Cr(silox)3]−.
Organomolybdenum chemistry is the chemistry of chemical compounds with Mo-C bonds. The heavier group 6 elements molybdenum and tungsten form organometallic compounds similar to those in organochromium chemistry but higher oxidation states tend to be more common.
Transition metal carbyne complexes are organometallic compounds with a triple bond between carbon and the transition metal. This triple bond consists of a σ-bond and two π-bonds. The HOMO of the carbyne ligand interacts with the LUMO of the metal to create the σ-bond. The two π-bonds are formed when the two HOMO orbitals of the metal back-donate to the LUMO of the carbyne. They are also called metal alkylidynes—the carbon is a carbyne ligand. Such compounds are useful in organic synthesis of alkynes and nitriles. They have been the focus on much fundamental research.
Parisa Mehrkhodavandi is a Canadian chemist and Professor of Chemistry at the University of British Columbia (UBC). Her research focuses on the design of new catalysts that can effect polymerization of sustainably sourced or biodegradable polymers.
Jenny Yue-fon Yang is an American chemist. She is a Professor of chemistry at the University of California, Irvine where she leads a research group focused on inorganic chemistry, catalysis, and solar fuels.
Brandi Michelle Cossairt is an American chemist specializing in synthetic inorganic and materials chemistry. She is the Lloyd E. and Florence M. West Endowed Professor of Chemistry at University of Washington.
In coordination chemistry and organometallic chemistry, transition metal imido complexes is a coordination compound containing an imido ligand. Imido ligands can be terminal or bridging ligands. The parent imido ligand has the formula NH, but most imido ligands have alkyl or aryl groups in place of H. The imido ligand is generally viewed as a dianion, akin to oxide.
2,6-Diisopropylaniline is an organic compound with the formula H2NC6H3(CHMe2)2 (Me = CH3). It is a colorless liquid although, like many anilines, samples can appear yellow or brown. 2,6-Diisopropylaniline is a bulky aromatic amine that is often used to make ligands in coordination chemistry. The Schrock carbenes often are transition metal imido complexes derived from this aniline. Condensation with diacetylpyridine and acetylacetone gives, respectively, diiminopyridine and NacNac ligands.
The inorganic imides are compounds containing an ion composed of nitrogen bonded to hydrogen with formula HN2−. Organic imides have the NH group, and two single or one double covalent bond to other atoms. The imides are related to the inorganic amides (H2N−), the nitrides (N3−) and the nitridohydrides (N3−•H−).
Abiological nitrogen fixation describes chemical processes that fix (react with) N2, usually with the goal of generating ammonia. The dominant technology for abiological nitrogen fixation is the Haber process, which uses an iron-based heterogeneous catalysts and H2 to convert N2 to NH3. This article focuses on homogeneous (soluble) catalysts for the same or similar conversions.
Jonas C. Peters is the Bren Professor of Chemistry at the California Institute of Technology and Director of the Resnick Sustainability Institute. He has contributed to the development of catalysts and photocatalysts relevant to small molecule activation.
Karsten Meyer is a German inorganic chemist and Chair of Inorganic and General Chemistry at the Friedrich-Alexander University of Erlangen-Nürnberg (FAU). His research involves the coordination chemistry of transition metals as well as uranium coordination chemistry, small molecule activation with these coordination complexes, and the synthesis of new chelating ligands. He is the 2017 recipient of the Elhuyar-Goldschmidt Award of the Spanish Royal Society of Chemistry, the Ludwig-Mond Award of the Royal Society of Chemistry, and the L.A. Chugaev Commemorative Medal of the Russian Academy of Sciences, among other awards. He also serves as an Associate Editor of the journal Organometallics since 2014.
Paula L. Diaconescu is a Romanian-American chemistry professor at the University of California, Los Angeles. She is known for her research on the synthesis of redox active transition metal complexes, the synthesis of lanthanide complexes, metal-induced small molecule activation, and polymerization reactions. She is a fellow of the American Association for the Advancement of Science.
   | This biographical article about an American chemist is a stub. You can help Wikipedia by expanding it. |
