Download or read book Synthesis Characterization and Reactivity of Hexanuclear Rhenium Clusters Containing Nitrogen donor Ligands written by Jessica L. Durham and published by . This book was released on 2012 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Reactivity Studies of Hexanuclear Rhenium Cluster Complexes with Oxygen and Sulfur Donor Ligands written by Julia A. Edwards and published by . This book was released on 2008 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Reactivity of Prochiral Ruthenium Clusters and Bimetallic Rhenium Complexes with an Unsymmetrical Diphosphine and Hard Soft Donor Ligands written by Darrell D. Mayberry and published by . This book was released on 2019 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of Hexanuclear Rhenium Chalcogenide Clusters Containing Potential Two Photon Absorbing Ligands and the Synthesis and Characterization of Gold Substituted Coumarins written by James Benjamin Updegraff (III.) and published by . This book was released on 2010 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hexanuclear rhenium clusters of the form Re6(u^3-Q8)(PR3)4X2, (Q = Se, S and X = Br- or I- ), and Re6(u^3-Q8)(PR3)4(PEt3)2, where PR3 = tris(4-(4-tert-butylstyrenyl)phenyl)phosphine (PTbs3) have been synthesized and characterized. PTbs3 was chosen for its potential as a two-photon absorbing ligand. Binding of PTbs3 to the cluster core does not completely quench the luminescence of the cluster core. The requirements for Förster energy transfer (FRET) have also been fulfilled. Accessing to the triplet state emission of the cluster core by exciting the PTbs3 ligand using lower-energy light should be achieved. Coumarins substituted at the 6-, 7-, and 8-positions with (phosphine/carbene)gold(I) fragments have also been synthesized in an effort to probe the luminescent properties brought about by a heavy atom such as gold. Each new substituted-coumarin has been characterized by multi-nuclear NMR, elemental combustion analysis, UV-Vis spectroscopy and emissions spectroscopy. In each case, the addition of the gold(I) fragment resulted in the observance of triplet-state emission at room temperature which was not observed for the free coumarin molecule.
Download or read book Studies of Rhenium Based Clusters Containing Nitriles and Heterocyclic Ligands written by Yixin Ren and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of cluster chemistry is relatively young when compared to studies on single metal coordination complexes. The fundamental studies on the hexanuclear cluster core will provide a better understanding of the differences from single metal center. Research described in this thesis focuses on developing synthetic methodologies towards the preparation of hexanuclear clusters containing novel types of N-donor terminal ligands and subsequently studying the reactivity of these systems. Previous studies in the Szczepura group have shown that nitrile groups can be activated by the [Re6Se 8]2+ cluster to react with inorganic azides to form tetrazolate rings. The initial goal of the reaction was to substitute the nitrile with azide, however, cycloaddition was observed. This unexpected result emphasizes the need for further studies involving the synthesis and reactivity of various nitrile ligands. Two complexes containing a nitrile group coordinated to a hexarhenium cluster, [Re6Se8(PEt3)5 (p-nitrobenzonitrile)](SbF6)2∙acetone and [Re6Se8(PEt3)5(NCC(CH 3)3)](SbF6)2∙NCC(CH3) 3, were studied by X-ray diffraction. These structures are reported here. The formation of tetrazolate rings on the [Re6Se8] 2+ cluster core sparks interest that other cycloaddition reactions may be feasible. Two new hexarhenium clusters, [Re6Se8(PEt 3) 5(NC(CH3)O(CH2)2)](BPh 4)2 and [Re6Se8(PEt3)5(NC(CH 3)O(CH2)3)](BPh4)2, containing oxazoline and oxazine ligands were isolated in high yield and purity. Initial isolation of these cluster complexes by a former student in the Szczepura group resulted in impure materials due to reaction with halide counter ions. However, metathesis with the tetraphenylborate ion enabled us to improve the purity and yield of these products. The oxazoline and oxazine ligands are neutral and can be removed via irradiation with a Hg/Xe lamp. Details of the ring removal studies via irradiation, along with preliminary studies involving the potential catalytic reactivity of these hexarhenium clusters will be discussed.
Download or read book Progress Towards the Synthesis of Site differentiated Hexanuclear Molybdenum and Rhenium Clusters Containing Sulfur Donor Ligands written by Jeffrey N. Templeton and published by . This book was released on 2006 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Reactivity of Dinuclear Rhodium II Complexes Containing Nitrogen Donor Ligands written by Charles A. Crawford and published by . This book was released on 1995 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Reactivity of Iron Complexes with N donor Ligands in Relation to Oxygenation of Hydrocarbons written by Remle Çelenligil-Çetin and published by . This book was released on 2004 with total page 766 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Reactivity and Removal Studies of Rhenium Based Cluster Complexes with Heterocyclic Terminal Ligands written by Joan N. Tirado and published by . This book was released on 2011 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Reactivity of Rhenium platinum Dihydrides written by Edward Walter Rutter and published by . This book was released on 1989 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rhenium Complexes with O N S Ligands written by Sulochana Junnotula and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The main focus of this thesis is the synthesis and characterization of nonradioactive rhenium complexes containing O, N, S ligands. Chapter 2 describes the rhenium labeling of four somatostatin analogues. Confirmation for the formation of nonradioactive rhenium labeled peptides was accomplished with LC-MS. Purification was done by analytical HPLC. Chapter 3 describes the synthesis, characterization and determination of acid dissociation constant values for the two rhenium complexes with ethylenediamine type ligands. This chapter also describes the synthesis and characterization of a rhenium amine complex with the 2-aminoethanethiolate ligand and a phosphine ligand.
Download or read book Synthesis Characterization and Reactivity of Technetium and Rhenium Complexes in Intermediate Oxidation States written by Harvey Stewart Trop and published by . This book was released on 1979 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Reactivity of Rhenium III Complexes for Catalytic Stoichiometric and Insertion Reactions written by Damaris Esther Pérez and published by . This book was released on 2018 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigations Into Ligand Substitutions of Rhenium and Molybdenum D 4 Hexanuclear Clusters and the Synthesis and Characterization of Aurated Pyrene and Thiophene Derivatives written by Miya Alethea Peay and published by . This book was released on 2011 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ligand substitution reactions were performed on d 4 rhenium and molybdenum hexanuclear clusters. For the [Re6(3-Q)8] 2+ clusters, where Q= S, Se, varying amounts of tributylphosphine and reaction times yielded multiply substituted clusters. Phosphine substituted reactions were monitored by 31P and 1H NMR as well as mass spectrometry. 31P NMR showed substitution through downfield shifts, for the [Re6S8] 2 clusters, and upfield for that of the [Re6Se8] 2+ clusters from the free tributylphosphine ligand, while mass spectrometry determined the amount of bound phosphines (four or five). Cis-, trans-, and penta-phosphine clusters were generated from these reactions. Triflates replaced apical chlorides on the Mo(II) cluster for increasing lability. A crystal structure was determined from this cluster displaying that of a [Mo6Cl8] 4 core surrounded by six triflate ligands bound through oxygen. Two tetraphenylphosphonium cations are also found with the structure. Base-promoted transmetalation was used to attach phosphine gold(I) fragments to the ends of pyrene. Three new compounds were generated with tricyclohexylphosphine- and triphenylphosphinegold(I) at the 2- and 2,7-positions. 31P and 1H NMR confirm reactions went to completion with no traces of the starting phosphine. Diffraction quality crystals were reported for two of the products. Binding of the phosphine causes a red shifting and increase of the absorbance which is further enhanced with additional gold(I) ligands. Finally, diaurated bithiophene was produced from a boron transmetalation reaction. Triphenylphosphinegold bromide provided a suitable starting ligand for the replacement of terminal boropinacolates on the bithiophene. Reaction monitoring through multinuclear spectroscopy and mass spectrometry determined a diaurated species. A crystal structure allowed visual confirmation of the complex demonstrating the triphenylphosphinegold(I) ligand bound to the carbon adjacent to the sulfur atom. In agreement with aurated pyrenes, phosphine binding both red shifts and increases the absorbance. Further evaluation would enable studies of its optoelectronics properties.
Download or read book Synthesis and Reactivity of Cyclometallated Complexes Containing Nitrogen Donor Ligands written by Omar Khalid Al-Duaij and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Reactivity of Some Mixed metal Rh and Au Complexes Containing Primarily Phophine and Phosphite as Ligands written by Angela Marie Buehler and published by . This book was released on 1985 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Reactivity of Rhenium I Tris acetylene and Oxo Bis acetylene Complexes Oxygen Atom Transfer Reactions of Rhenium Triazacyclononane Compounds written by Rebecca Renae Conry and published by . This book was released on 1991 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
