Synthesis, Characterization, and Reactivity of Metal Hexateriary Phosphine Complexes PDF Download
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Author: Suzanne Elizabeth Saum
Publisher:
ISBN:
Category : Complex compounds
Languages : en
Pages :
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Author: Suzanne Elizabeth Saum
Publisher:
ISBN:
Category : Complex compounds
Languages : en
Pages :
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Author: Lisa Marie Green
Publisher:
ISBN:
Category : Ligands
Languages : en
Pages : 502
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Author: Ann Marie Mueting
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ISBN:
Category :
Languages : en
Pages : 586
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Author: Mary Karen Hays
Publisher:
ISBN:
Category : Complex compounds
Languages : en
Pages : 318
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Author: Janet Malinda Kessler
Publisher:
ISBN:
Category : Complex compounds
Languages : en
Pages : 488
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Author: Evan Freiberg
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ISBN:
Category :
Languages : en
Pages : 446
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Chapter 1. The chemistry of the metal-metal multiply bonded Tc2(II, II) core has been investigated with bis(diphenylphosphino)methane (dppm). The parent complex, Tc2Cl4(dppm)2, has been prepared from the reaction of Tc2C14(PEt3)4 with dppm. The reactivity of Tc2Cl4(dppm)2 with tert-butyl isocyanide has been studied and a neutral 1:1 adduct, Tc2Cl4(dppm)2CNBut, a cationic 1:2 adduct, [Tc2Cl3(dppm)4(CNBut)2](PF6), and a [mu]-iminyl complex, [Tc2Cl3(dppm)2(CNBut)2CNHBul(PF6), have been prepared. The parent compound and its reaction products have been characterized via a combination of spectroscopic techniques and single crystal X-ray crystallography. The metal-metal bonded ditechnetium bis(dppm) motif is retained in the reaction products. Chapter 2. The reduction of ammonium pertechnetate with bis(diphenylphosphino)methane (dppm), and with diphenyl-2-pyridyl phosphine (Ph2Ppy), has been investigated. The neutral Tc(II) complex, TcCl2(dppm)2, has been isolated from the reaction of (NH4)[TcO4] with excess dppm in refluxing EtOH/HCl. Chemical oxidation with ferricinium hexafluorophosphate results in formation of the cationic Tc(III) analogue, [TcCl2(dppm)2](PF6). The dppm ligands adopt the chelating bonding mode in both complexes, resulting in strained four member metallocycles. With excess PhPpy, the reduction of (NH4)[TcO4] in refluxing EtOH/HCl yields a complex with one chelating Ph2Ppy ligand and one unidentate Ph2Ppy ligand, TcCl3(Ph2Ppy-P, N)(Ph2Ppy-P).
Author: Lori Ruth Ann Stepan Van der Sluys
Publisher:
ISBN:
Category :
Languages : en
Pages : 714
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Author: Erin Amanda Gwynne
Publisher:
ISBN:
Category :
Languages : en
Pages : 170
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Bulky, electron-rich phosphine ligands facilitate unique reactivity in various chemical systems and can stabilize metal species in unusual oxidation states or environments. Routes to bulky bis(phosphine) chelating ligands that mimic the sterics of the exceptionally bulky tri-tert -buylphosphine are explored with the ultimate goal of preparing novel catalyst systems of group 10 metals capable of hydrogenation. Attempts to target bulky phosphines from phosphinimine precursors highlight some interesting phosphinimine reactivity, however attempts to reduce the phosphinimine bond revealed limitations. Bis(aminophosphine) ligands present an alternate route to bulky bis(phosphines) and allow for tunability of the environment around phosphorus. The coordination of these ligands with palladium and nickel exhibit a novel bonding mode in which C-H or N-H activation of the ligand occurs to form strained metallacycles. Prepared compounds showed some activity as catalysts under hydrogen and isomerized 1-hexene to 2-hexene, offering support for their potential use as hydrogenation catalysts.
Author: Alicia L. McDaniel
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 136
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Author:
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ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 532
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