Download or read book The Synthesis and Spectroscopic Characterization of Bis acetylacetonato Palladium II Phosphine Complexes written by Steven Ray Childress and published by . This book was released on 1989 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Synthesis and Characterization of Bidentate Phosphine and Arsine Ligands and Their Complexes with Palladium II and Platinum II written by David Michael Anthony Minahan and published by . This book was released on 1982 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Reactivity of Nickel Palladium and Platinum Phosphine Complexes with Hydridoamido Hydridophenoxo and Dithiooxalato Ligands written by Robert L. Cowan and published by . This book was released on 1989 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design and Synthesis of Metal Phosphine Complexes of Palladium ii and Gold i with Various Receptor Ligands for Ion Controlled Or Photoresponsive Host Guest Chemistry written by Hau-San Tang and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Design and Synthesis of Metal Phosphine Complexes of Palladium(II) and Gold(I) With Various Receptor Ligands for Ion-controlled or Photoresponsive Host-guest Chemistry" by Hau-san, Tang, 鄧巧珊, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled DESIGN AND SYNTHESIS OF METAL PHOSPHINE COMPLEXES OF PALLADIUM(II) AND GOLD(I) WITH VARIOUS RECEPTOR LIGANDS FOR ION-CONTROLLED OR PHOTORESPONSIVE HOST-GUEST CHEMISTRY Submitted by Tang Hau San for the Degree of Doctor of Philosophy at The University of Hong Kong in August 2006 A series of palladium(II) phosphine complexes containing different receptor sites, [Pd(PPh R) Cl] [R = C H NHCOCH, C H N(CH )COCH, 2 2 2 6 4 3 6 4 3 3 C HNHCONHPh, C HNHCOPyr and C H NHCO(CH )Pyr] have been 6 4 6 4 6 4 2 3 prepared. Two X-ray crystal structures have been determined, in which one of the crystal structures showed hydrogen bonding interactions between the amide protons and the Cl ions with distances of ca. 2.466 A. The photophysical properties of these complexes have been studied and their emission origins were elucidated. The binding properties of the complexes towards anions have 1 31 been studied by H NMR, P NMR, UV-vis and emission spectrophotometry, in which drastic changes in the ratio of trans to cis isomers upon addition of 31 anions were observed in the P NMR titration studies. The present ion-induced conformational change involving a trans-cis isomerization of the square-planar palladium(II) complex via the binding of anions to amide or urea functionalities through hydrogen bonding interactions represents a new class of ion-controlled switching devices based on transition metal systems. A series of gold(I) alkynyl phosphine complexes containing azobenzene or stilbene functionalities, [{Au(PPh )} (C≡C-L-C≡C)] and [Au (P DEGREESP) (C≡C-L- 3 2 4 2 C≡C) ] [L = C H -N=N-C H or C H -CH=CH-C H; P DEGREESP = dppm, dcpm, 2 6 4 6 4 6 4 6 4 Ph PN(C H F-p)PPh, Ph PN( Pr)PPh, Ph PN(C H )PPh] have been 2 6 4 2 2 2 2 14 29 2 synthesized and characterized. The X-ray crystal structure of [Au (dppm) (C≡C- 4 2 L-C≡C) ] revealed that the two azobenzene ligands in the tetranuclear complex adopted a trans disposition with the presence of short intramolecular Au Au contacts. The azobenzene-containing gold(I) complexes showed emissions both in dichloromethane solution at room temperature and in 77 K glass, which were assigned as a metal-perturbed intraligand (IL) origin mainly derived from the π-π*(C≡C) states with some mixing of a π-π* character of the azo unit. On the other hand, the emissive origin of the stilbene-containing gold(I) complexes was assigned as derived from the π-π* excited state of the stilbene moiety with some mixing of the alkynyl units, and probably mixed with σ(Au-P) → π*(C≡C) excited state in the solid states. The photoisomerization properties of the dinuclear and tetranuclear complexes have been studied, in which a tetranuclear macrocyclic gold(I) alkynyl phosphine complex was demonstrated to function as a dual input molecular logic with photoswitching behaviour that could be controlled by addition or removal of silver(I). In addition, several gold(I) complexes with different crown ether pendants including the mercapto-azacrown ether-containing complexes, [Au (P DEGREESP)(S-A15C5) ] [P DEGREESP = dppm, dcpm] and the mononuclear gold(I) alkynyl 2 2 complexes, [Au(PPh )(C≡CR)] [R = B15C5, B15S5], and dinuclear gold(I) complexes with oligo(ethylene oxide) linkages, [{(Ph P)

Download or read book Synthesis and Characterization of Bis phosphine Complexes with Transition Metals written by Alicia L. McDaniel and published by . This book was released on 2009 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Reactivity of Unusual Palladium II Complexes Supported by a Diarylamido BIS Phosphine PNP Pincer Ligand written by Rafael Huacuja and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation discusses the synthesis and reactivity of divalent palladium complexes supported by diarylamido bis-phosphine pincer ligands (PNP). The PNP is a tridentate pincer type ligand which typically adopts meridional type coordination. The rigidity and tight coordination of the PNP ligand provides the unique opportunity to study the coordination of ligands such as O2 and C2H4 to a single coordination site on palladium, or the reactivity of a single empty coordination site trans to a weak trans-influencing ligand such as diarylamido. Irradiation of [(^(F)PNP^(iPr))Pd-]2 under an atmosphere of dioxygen irreversibly produces a mixture of a monohapto palladium(II) superoxide ((^(F)PNP^(iPr))PdO2) and a palladium micro-peroxide ([(^(F)PNP^(iPr))PdO-]2). Under photolytic conditions these two complexes are in equilibrium with each other. (^(F)PNP^(iPr))PdO2, an open-shell paramagnetic species, was characterized by a combination of single-crystal X-ray crystallography, EPR, and 19F NMR spectroscopies. In addition, irradiation of [(PNP)Pd-]2 under an atmosphere of C2H4 produces a mixture of [(PNP)Pd-]2 and a ethylene-bridged dinuclear palladium complex ([(PNP)Pd-CH2-]2). If the ethylene headspace is removed, and [(PNP)Pd-CH2-]2 is irradiated it is completely converted to [(PNP)Pd-]2. This suggests that in the presence of ethylene these two complexes are in photolytic equilibrium with each other. In addition, this dissertation will also discuss the synthesis and reactivity of [(PNPR)Pd]+ (R = ^(i)Pr, ^(t)Bu) cations. [(^(F)PNP^(iPr))Pd]+ cations are highly electrophilic complexes that are able to coordinate Lewis bases such as THF, H2O, and even extremely poor Lewis bases such as toluene and benzene. In addition, irradiation of [(^(F)PNP^(iPr))Pd]+ cations in bromobenzene induces the abstraction of a bromine atom from bromobenzene, consistent with a metalloradical species. Addition of dioxygen to [(^(F)PNP^(iPr))Pd]+ cations generates a paramagnetic, cationic [eta]1 superoxide. In non-halogenated arene solvents [(^(F)PNP^(iPr))Pd]+ cations undergo a highly unusual photo-induced isomerization of the isopropyl groups on the supporting phosphines to n-propyl. This unprecedented isomerization is believed to occur via C-P bond cleavage and is driven by the decrease in sterics around the metal, which allows for the facilitated coordination of the arene solvent. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/152457

Download or read book Synthesis Characterization and Reactivity of Bis amido bis trimethylphosphine palladium II Complexes written by Perla M. Izsak and published by . This book was released on 1997 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Synthesis of Four Palladium II Tertiary Phosphine Complexes written by Michael Orchowski and published by . This book was released on 2000 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis Characterization and Reactivity of Mononuclear Palladium Complexes Bearing Nitrogen and Carbon donor Ligands written by Nicholas Ruhs and published by . This book was released on 2017 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: The importance of Pd-catalyzed C--H functionalization reactions for chemical transformations has been widely studied over the last several decades. Much of the research to date has focused on conventional Pd0/II catalytic cycles. However, more recent studies have shown that many transformations can also follow a PdII/IV catalytic cycle. High-valent PdIII and PdIV species are often proposed to be important intermediates in such transformations. C--H coupling reactions involving high-valent intermediates often involve the oxidation of a PdII species to a PdIII or PdIV complex, which can then undergo subsequent C--heteroatom bond formation. However, the need for harsh oxidants and reaction conditions in many of these reactions hinders their practical applicability. The focus of this work is to study the properties and reactivity of PdII, PdIII, and PdIV complexes through modifications of the supporting macrocyclic ligands. Another goal of this work is to probe the ability of these complexes to facilitate C--H activation and C--heteroatom bond formation reactions using environmentally benign oxidants.Our lab reported the synthesis and characterization of the first organometallic mononuclear PdIII complexes stabilized by the tetradentate ligand N,N'-di-tert-butyl-2,11-diaza[3,3](2,6)pyridinophane (tBuN4). In order to further probe the Pd chemistry with this class of ligands, we prepared ligands with modifications to the steric bulk on the amine groups. In the first study detailed in chapter 2, the synthesis and characterization of PdII and PdIII complexes supported by N,N'-di-neo-pentyl-2,11-diaza[3,3](2,6)-pyridinophane(NpN4) and N,N'-di-benzyl-2,11-diaza[3,3](2,6)-pyridinophane(BzN4) is reported. Interestingly, the spectroscopic and crystallographic property of the newly synthesized complexes falls between the tBuN4 and MeN4 complexes. The C--C and C--heteroatom bond formation reactivity of the NpN4 and BzN4 supported complexes is also similar to our group's previously reported complexes.We also prepared and studied a series of Pd complexes bearing a modified tetradentate pyridinophane ligand, tBuN3CH. Essentially, we have replaced one of the nitrogen donor atoms from the N4 ligand with a carbon atom and have also introduced a new C--H bond. Due to its expected positioning near the metal center, this bond has the potential to undergo intramolecular C--H bond activation. In order to study the reactivity of this ligand, electronic modifications were made by substituting various electron-donating and withdrawing groups in the para position to this new C--H bond. In chapter 3, the synthesis and characterization of a series of PdII, PdIII, and PdIV complexes stabilized by the N3CH ligand is reported. Interestingly, a spectroscopic and crystallographic study of the pRN3CHPdII(OAc)2 complexes reveals that the Cipso--H bond remains unactivated at the PdII stage. However, upon oxidation to PdIII, the Cipso--H bond is activated.Interestingly, we discovered that the aerobic oxidation of the PdII complex [pRN3CHPdII(MeCN)](BF4) leads to the formation of the PdIII complex [pRN3CHPdIII(MeCN)](ClO4)2 at room temperature. Surprisingly, the C--H activation reaction proceeds in the presence of oxygen without the need for external base. Furthermore, the moderate rate of the reaction allowed us to investigate the mechanism of the reaction by utilizing kinetics and UV-Vis spectroscopy. Detailed mechanistic studies revealed that C--H activation of the Cipso--H bond is the rate determining step of the reaction.

Download or read book ACS Directory of Graduate Research 1993 written by American Chemical Society. Committee on Professional Training and published by . This book was released on 1993 with total page 1700 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design and Synthesis of Metal Phosphine Complexes of Palladium II and Gold I with Various Receptor Ligands for Ion controlled Or Photoresponsive Host guest Chemistry written by Hau-san Tang and published by . This book was released on 2006 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Characterization of Palladium II Complexes as Potential Antitumor Agents written by Tatyana Vladimirovna Dalrymple and published by . This book was released on 2007 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis Characterization and Reactivity of Low Valent Technetium Phosphine Complexes written by Evan Freiberg and published by . This book was released on 2001 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).

Download or read book The Synthesis and Characterization of Nickel Platinum and Palladium Triphenyl phosphine and DPPE maleonitriledithiolate Complexes for Use as Intermediates in the Synthesis of the C60 Maleonitriledithiolate Target Molecule written by Francesca L. Filler and published by . This book was released on 1996 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Characterization of Palladium II Complexes of Phenothiazines written by Ravindra K. Vallabhaneni and published by . This book was released on 1994 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Welch Foundation Annual Report written by Robert A. Welch Foundation and published by . This book was released on 1991 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nickel written by Jitte Flapper. and published by . This book was released on 2009 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: