Download or read book Seven Coordinate Molybdenum and Tungsten Complexes Containing Tpm and Tpm Derivatives and the Impact of Ligand Substitution on NMR Chemical Shifts written by Cole Seager and published by . This book was released on 2019 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A series of known and new seven coordinate molybdenum and tungsten complexes of tris(pyrazolyl)methane (Tpm) and substituted Tpm, [TpmM(CO)3X]+, have been synthesized. Depending on the identity of X, (bromo, iodo, hydrido) and the substitution of the Tpm ligand, substantial chemical shift differences are observed for the hydrogen on the central carbon of the Tpm ligand. Factors impacting the chemical shift of the hydrogen on the central carbon of the Tpm ligand, such as the electron donating ability of the Tpm ligand and the electronegativity of the additional ligand on the metal, will be discussed"--Unnumbered leaf 1.
Download or read book Tpm Ph Derivative of Tungsten Hydrogen bonding in 7 coordinate Cation Complex written by Olivia R. Simcox and published by . This book was released on 2024 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Tpm^Ph, or tris(3-phenylpyrazolyl)methane reacts with tungsten hexacarbonyl to form the ligand-metal complex tris(3-phenylpyrazolyl)methane tungsten tricarbonyl, or Tpm^PhW(CO)3. The further complexes of Tpm^PhW(CO)3 and Tpm^PhMo(CO)3 are not known. This project aims to explore how the addition of a phenyl substituent to the pyrazole ring on Tpm impacts the synthesis of [Tpm^PhW(CO)3I]+X- and [Tpm^PhW(CO)3H]+X-. The inclusion of this phenyl substituent may impact the possible hydrogen bonding of then hydrogen contained in the carbon-hydrogen bond. This work aims to explore the extent of hydrogen-bonding of the carbon-hydrogen bond of the Tpm^Ph ligand in cationic metal complexes"--Leaf 1.
Download or read book The Characterization and Reactivity of Tris 4 methylpyrazolyl methane and Its Tungsten and Molybdenum Metal Complexes written by Julia M. Pomeroy and published by . This book was released on 2020 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The scorpionate ligand tris(pyrazolyl)borate (Tp) has contributed to the understanding of coordination and organometallic chemistry and has proven to be useful in the synthesis of metalloprotein models. Studies focusing on the similar ligand, tris(pyrazolyl)methane (Tpm), have recently been made possible with improved synthetic techniques. Characterization of the Tpm ligand and its metal derivatives, [TpmW(CO)3L]+ and [TpmMo(CO)3L]+, unveiled unexpected activity in the 1H NMR chemical shift of the methane hydrogen after the coordination of a seventh ligand. The more electronegative the seventh ligand was, the more downfield the chemical shift appeared. Various analogs of Tpm have since been synthesized that substitute methyl groups on different positions of the pyrazolyl rings and the effect of these substitutions on the methane hydrogen was examined. This work successfully synthesized an analog of Tpm(4-methyl) and its metal complexes of Tpm(4-methyl)W(CO)3 and Tpm(4-methyl)Mo(CO)3. The reactivity of Tpm(4-methyl)M(CO)3 (M = W or Mo) was observed and FTIR, 1H NMR, and 13C NMR were used for the characterization of [Tpm(4-methyl)M(CO)3L]+[X]- (L = H, I, or Br; X = counterion). The chemical shift of the methane hydrogen was further examined and determined to follow the same trend seen in the previously reported Tpm metal complexes"--Leaf 1.
Download or read book Some New Seven coordinate Tungsten II and Molybdenum II Carbonyl Complexes Containing Mono and Bidentate N S Donor Ligands written by S. Hughes and published by . This book was released on 1994 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Six and Seven coordinate Tungsten II and Molybdenum II Carbonyl Dithiocarbamate Complexes written by Bennett C. Ward and published by . This book was released on 1980 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tungsten Complexes written by Harry Beckerman and published by . This book was released on 1918 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seven coordinate complexes of molybdenum II and tungsten II containing pyridine 2 thionate and pyrimidine 2 thionate Crystal structure of W CO 3 n2 pymS 2 pymS written by P K. Baker and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tungsten and Molybdenum Tetranuclear Clusters Supported by Alkoxide Ligands and the Cleavage of Carbon Monoxide written by Charles Earl Hammond and published by . This book was released on 1989 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molybdenum and Tungsten Complexes of Dinitrogen CO and Isocyanides that Contain Aryl substituted Triamidoamine Ligands written by George Emil Greco and published by . This book was released on 2000 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Some Novel Reactions of Seven Coordinate Complexes of Molybdenum II and Tungsten II written by Christen Michael Giandomenico and published by . This book was released on 1981 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carbene Chemistry written by Guy Bertrand and published by CRC Press. This book was released on 2002-05-14 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: Highlights recent discoveries in the development of rapid kinetic techniques that allow for direct visualization and state-of-the-art computational methods.
Download or read book Physical and Preparative Studies of Molybdenum and Tungsten Complexes written by Ronald D. Archer and published by . This book was released on 1966 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several new molybdenum complexes containing chelated 8-hydroxy-quinolinato ligands, including (MoCl(C5H5N) (C9H6NO)2) and (MoCl2(C5H5N)2(C9H6NO) and three oxomolybdenum(V) derivatives were prepared and studied. A cationic molybdenum(III) species containing chelated ethylenediamine and a cationic tungsten(IV) species containing chelated 2,2(1)-bipyridine were also synthesized. Other preparative studies included photochemical investigations with tungsten(IV). The complex formerly designated as K2MoCl5H2O by other workers was shown to have less than enough potassium for such a formula, the spectra of K3MoCl6 as currently in the literature has been shown to be incorrect, and the apparent discrepancy in the literature concerning the tetrazole complex Fe(C2F3N4)2.2H2O was explained. (Author).
Download or read book The Synthesis and Reactivity of Cycloheptatrienyl Molybdenum and Tungsten Complexes Containing Bisphosphine and Diamine Ligands written by Salasiah Endud and published by . This book was released on 1985 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dinitrogen and Organometallic Chemistry of Trimethylsilyl substituted Triamidoamine Complexes of Molybdenum written by Myra Brigid O'Donoghue and published by . This book was released on 1999 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Inorganic Syntheses Volume 33 written by and published by John Wiley & Sons. This book was released on 2004-08-04 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Inorganic Syntheses series provides inorganic chemists with detailed and foolproof procedures for the preparation of important and timely compounds. Volume 33 includes provocative contributions on syntheses of selected supramolecules, useful reagents/ligands, solid state materials/clusters, and other compounds of general interest.
Download or read book Machine Learning in Chemistry written by Jon Paul Janet and published by American Chemical Society. This book was released on 2020-05-28 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent advances in machine learning or artificial intelligence for vision and natural language processing that have enabled the development of new technologies such as personal assistants or self-driving cars have brought machine learning and artificial intelligence to the forefront of popular culture. The accumulation of these algorithmic advances along with the increasing availability of large data sets and readily available high performance computing has played an important role in bringing machine learning applications to such a wide range of disciplines. Given the emphasis in the chemical sciences on the relationship between structure and function, whether in biochemistry or in materials chemistry, adoption of machine learning by chemistsderivations where they are important
Download or read book Selenium in plants written by Elizabeth A.H. Pilon-Smits and published by Springer. This book was released on 2017-05-10 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers many facets of plant selenium (Se) accumulation: molecular genetics, biochemistry, physiology, and ecological and evolutionary aspects. Broader impacts and applications of plant Se accumulation also receive attention. Plant Se accumulation is very relevant for environmental and human health. Selenium is both essential at low levels and toxic at high levels, and both Se deficiency and toxicity are problems worldwide. Selenium can positively affect crop productivity and nutritional value. Plants may also be used to clean up excess environmental Se. Selenium in plants has profound ecological impact, and likely contributes to Se movement in ecosystems and global Se cycling.
