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Richard Robert Ernst was a Swiss physical chemist and Nobel laureate.
A carbocation is an ion with a positively charged carbon atom. Among the simplest examples are the methenium CH+
3, methanium CH+
5 and vinyl C
2H+
3 cations. Occasionally, carbocations that bear more than one positively charged carbon atom are also encountered.
George Andrew Olah was a Hungarian-American chemist. His research involved the generation and reactivity of carbocations via superacids. For this research, Olah was awarded a Nobel Prize in Chemistry in 1994 "for his contribution to carbocation chemistry." He was also awarded the Priestley Medal, the highest honor granted by the American Chemical Society and F.A. Cotton Medal for Excellence in Chemical Research of the American Chemical Society in 1996.
In nuclear magnetic resonance (NMR) spectroscopy, the chemical shift is the resonant frequency of an atomic nucleus relative to a standard in a magnetic field. Often the position and number of chemical shifts are diagnostic of the structure of a molecule. Chemical shifts are also used to describe signals in other forms of spectroscopy such as photoemission spectroscopy.
Nuclear magnetic resonance spectroscopy, most commonly known as NMR spectroscopy or magnetic resonance spectroscopy (MRS), is a spectroscopic technique based on re-orientation of atomic nuclei with non-zero nuclear spins in an external magnetic field. This re-orientation occurs with absorption of electromagnetic radiation in the radio frequency region from roughly 4 to 900 MHz, which depends on the isotopic nature of the nucleus and increased proportionally to the strength of the external magnetic field. Notably, the resonance frequency of each NMR-active nucleus depends on its chemical environment. As a result, NMR spectra provide information about individual functional groups present in the sample, as well as about connections between nearby nuclei in the same molecule. As the NMR spectra are unique or highly characteristic to individual compounds and functional groups, NMR spectroscopy is one of the most important methods to identify molecular structures, particularly of organic compounds.
Solid-state NMR (ssNMR) spectroscopy is a technique for characterizing atomic level structure in solid materials e.g. powders, single crystals and amorphous samples and tissues using nuclear magnetic resonance (NMR) spectroscopy. The anisotropic part of many spin interactions are present in solid-state NMR, unlike in solution-state NMR where rapid tumbling motion averages out many of the spin interactions. As a result, solid-state NMR spectra are characterised by larger linewidths than in solution state NMR, which can be utilized to give quantitative information on the molecular structure, conformation and dynamics of the material. Solid-state NMR is often combined with magic angle spinning to remove anisotropic interactions and improve the resolution as well as the sensitivity of the technique.
Frank Clifford Whitmore, nicknamed "Rocky", was a prominent chemist who submitted significant evidence for the existence of carbocation mechanisms in organic chemistry.
In organic chemistry, the term 2-norbornyl cation describes one of the three carbocations formed from derivatives of norbornane. Though 1-norbornyl and 7-norbornyl cations have been studied, the most extensive studies and vigorous debates have been centered on the exact structure of the 2-norbornyl cation.
Alexander Pines is an American chemist. He is the Glenn T. Seaborg Professor Emeritus, University of California, Berkeley, Chancellor's Professor Emeritus and Professor of the Graduate School, University of California, Berkeley, and a member of the California Institute for Quantitative Biosciences (QB3) and the Department of Bioengineering. He was born in 1945, grew up in Bulawayo in Southern Rhodesia and studied undergraduate mathematics and chemistry in Israel at Hebrew University of Jerusalem. Coming to the United States in 1968, Pines obtained his Ph.D. in chemical physics at M.I.T. in 1972 and joined the UC Berkeley faculty later that year.
John Dombrowski Roberts was an American chemist. He made contributions to the integration of physical chemistry, spectroscopy, and organic chemistry for the understanding of chemical reaction rates. Another characteristic of Roberts' work was the early use of NMR, focusing on the concept of spin coupling.
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Herbert Sander Gutowsky was an American chemist who was a professor of chemistry at the University of Illinois Urbana-Champaign. Gutowsky was the first to apply nuclear magnetic resonance (NMR) methods to the field of chemistry. He used nuclear magnetic resonance spectroscopy to determine the structure of molecules. His pioneering work developed experimental control of NMR as a scientific instrument, connected experimental observations with theoretical models, and made NMR one of the most effective analytical tools for analysis of molecular structure and dynamics in liquids, solids, and gases, used in chemical and medical research, His work was relevant to the solving of problems in chemistry, biochemistry, and materials science, and has influenced many of the subfields of more recent NMR spectroscopy.
Harden M. McConnell was an American physical chemist. His many awards included the National Medal of Science and the Wolf Prize, and he was elected to the National Academy of Science."
Jesús Jiménez Barbero is a Spanish scientist who has contributed to the advance of glycoscience by unraveling the conformational properties of carbohydrates and analogues and the molecular basis of their interactions with proteins, using a multidisciplinary approach that employs carbohydrate synthesis, molecular biology, molecular modelling and Nuclear Magnetic Resonance (NMR) spectroscopy.
William Dale Phillips was an American chemist, nuclear magnetic resonance spectroscopist, federal science policy advisor and member of the National Academy of Sciences. He was born October 10, 1925, in Kansas City, Missouri and died in St. Louis, Missouri, on December 15, 1993.
Jack H. Freed is an American chemist known for his pioneering work in electron paramagnetic resonance spectroscopy. He is the Frank and Robert Laughlin Professor of Physical Chemistry, emeritus, at Cornell University in Ithaca, New York.
Nitrogen-15 nuclear magnetic resonance spectroscopy is a version of nuclear magnetic resonance spectroscopy that examines samples containing the 15N nucleus. 15N NMR differs in several ways from the more common 13C and 1H NMR. To circumvent the difficulties associated with measurement of the quadrupolar, spin-1 14N nuclide, 15N NMR is employed in samples for detection since it has a ground-state spin of ½. Since14N is 99.64% abundant, incorporation of 15N into samples often requires novel synthetic techniques.
Geoffrey Bodenhausen is a French chemist specializing in nuclear magnetic resonance, being highly cited in his field. He is a Corresponding member of the Royal Netherlands Academy of Arts and Sciences and a Fellow of the American Physical Society. He is professeur émérite at the Department of Chemistry at the École Normale Supérieure (ENS) in Paris and professeur honoraire at the Laboratory of Biomolecular Magnetic Resonance of the École Polytechnique Fédérale de Lausanne (EPFL). He is a member of the editorial board of the journal Progress in Nuclear Magnetic Resonance Spectroscopy. He is the chair of the editorial board of the journal Magnetic Resonance.
Jill Millstone is a professor of chemistry at the University of Pittsburgh. She works on metal-ligand chemistry in nanoparticle synthesis. She is the American Chemical Society Kavli Foundation Emerging Leader in Chemistry Lecturer for 2018.
Dudley Howard Williams was a British biochemist known for utilizing nuclear magnetic resonance (NMR) spectroscopy and mass spectrometry in the study of molecular structure, especially the antibiotic vancomycin.
References
- 1 2 3 Division of History of Chemistry of the American Chemical Society Lambert Bio
- 1 2 Northwestern University Professor Emeritus Joseph B. Lambert Chemistry Group Web Page
- ↑ John Simon Guggeneheim Memorial Foundation Archived 2012-10-10 at the Wayback Machine
- ↑ "EDELSTEIN AWARD FOR OUTSTANDING ACHIEVEMENT IN THE HISTORY OF CHEMISTRY". American Chemical Society Division of the History of Chemistry. Retrieved 22 July 2019.
- ↑ Northwestern University 1999 Recipients of the McCormick and Alumnae Teaching Professorships "1999 Recipients of the McCormick and Alumnæ Teaching Professorships: Office of the Provost - Northwestern University". Archived from the original on 2012-06-20. Retrieved 2012-06-27.
- ↑ Trinity University Department of Chemistry Faculty & Staff
- ↑ The 2004 Edelstein Award Address
- ↑ Google Scholar Citations
- ↑ "Summer Weddings." The Tuscaloosa News, April 2, 1967
- ↑ "Joseph Buckley LAMBERT". landzert.free.fr. Archived from the original on 2016-03-04.
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