Download or read book Synthesis and Characterization of New Luminescent Lanthanide Complexes written by Sooa Tara Cho and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Characterization of New Luminescent Lanthanide Complexes written by Sooa Tara Cho and published by . This book was released on 2014 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Characterization of Lanthanide Complexes for Use in Near infrared Light Emitting Diodes written by Alison Steele Knefely and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: The synthesis and characterization of a series of new lanthanide porphyrin and phthalocyanine complexes was investigated in order to study the luminescence properties of these complexes for polymer light emitting diodes. These lanthanide complexes consist of the near-infrared emitting lanthanides (Ln=PrP3+P, NdP3+P, HoP3+P, TmP3+P, YbP3+P), a macrocyclic chromophore to sensitize the emission of the lanthanide ion, and a capping ligand to encapsulate and shield the lanthanide from solvent molecules that affect emission efficiency.

Download or read book Part I written by Emma Nicholls-Allison and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Reported in Chapter 2 of this thesis is the reliable and tolerant synthesis of a small library of pyrazole and triazole heterocycles. This synthesis was achieved in two steps in good yields from the reaction of acetophenone and benzamide derivatives with dimethyl formamide-dimethyl acetal followed by a cyclization with hydrazine. Also reported is the synthesis and characterization of their corresponding scorpionate ligands. Preliminary coordination chemistry was done with a variety of lanthanide metals and was studied by standard spectroscopic methods as well as variable temperature 1H NMR, which revealed that Curie-Weiss behaviour was followed for these complexes in solution. An X-ray crystal structure of a nine co-ordinate ytterbium metal centre with eight nitrogen atom (four pyrazole, four pyridine) donors and one chloride atom was obtained, which may have been a product of decomposition during crystal growth. The bond lengths of this structure were compared with other lanthanide complexes of similar structural motifs. This comparison supported the theory of decomposition as the pyridine nitrogen atom-ytterbium bond lengths were longer than the average ytterbium-nitrogen atom bond length.

Download or read book Synthesis and Structural Characterization of New Alkali Metal Alkalineearth Metal and Lanthanide Complexes with 1 4 diazabutadiene Ligands written by Ramesh Duraisamy and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis Characterization and Photophysical Studies of Organic Lanthanide Complexes written by Ka-Leung Wong 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, "Synthesis, Characterization, and Photophysical Studies of Organic-lanthanide Complexes" by Ka-Leung, Wong, 黃嘉良, 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 SYNTHESIS, CHARACTERIZATION, AND PHOTOPHYSICAL STUDIES OF ORGANIC- LANTHANIDE COMPLEXES Submitted by Ka-Leung Wong For Degree of Doctor of Philosophy at The University of Hong Kong in August 2006 The general background and coordination chemistry of lanthanides, their characteristic luminescent properties and nonlinear luminescent properties with the applications to material science and biological systems are reviewed. The design and synthesis of lanthanide-organic complexes based on similar tripodal amide ligands N-[2-(bis{2-[(ortho- substituent -benzoyl)amino]ethyl}amino)- ethyl]benzamide (ortho substituent-C H N O ) and bidentate amide ligands di-2- 27 27 4 3 methoxy-(2-aminoethyl)benzamide (C H N O ) were described. These ligands were 20 33 3 8 found to have different coordination to the lanthanide that caused a change in the photo-physical properties. The occurrences of high order multi-photon processes are rare, especially with lanthanide complexes. Generally there is a lack of clear molecular structure in systems that have been reported in the literature, hindering our understanding of the correlation of photo-structural properties. Our complexes have been found to display two different forms of coordination, which significantly affects their photo-properties. X-Ray structure analysis showed that, one being a linear polymeric form and the other a dendritic form, the latter has been found to exhibit an additive harmonic generation process as well as the multi-photon process which is present in both types of coordination. The design and synthesis of a metal-organic network were described based on a lanthanide complex that contains mucic acid, {[Ln(Mucicate) (H O) ].5H O} (Ln 1.5 2 2 2 n = Eu and Tb), exhibiting a novel 1-D hydrophilic channel in the porous framework. The 3D framework with a hydrophilic inner surface was found to exhibit a reversible - - - - anion uptake. Upon addition of an aqueous solution of sodium salts of I, Br, Cl, CN, 2- CO, to a solid sample of the Ln complex, the luminescent intensity enhancements were observed. The anion response of the channels is believed to be due to the effect of numerous OH groups in the mucic acid, which interacts strongly with the anion through hydrogen bonding. Experimental details including instruments used for physical characterization and the photo-physical measurement for linear, multi-photon absorption induced f-f emission and nonlinear emission were presented. DOI: 10.5353/th_b3687535 Subjects: Rare earth metals Organometallic compounds - Synthesis

Download or read book Synthesis Characterization and Spectroscopic Studies of Lanthanide Complexes with Potential for Increased Sensitization and Luminescent Enhancement written by Kendra Evette Whitehead and published by . This book was released on 2011 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: Develops techniques such as sensitization, to elude the Laporte forbidden inefficient f-f transitions.

Download or read book Synthesis and Characterization of Lanthanide Complexes of the Lacunary Wells Dawson Heteropolyanions written by Judit Bartis and published by . This book was released on 1997 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Lanthanide Luminescence written by Pekka Hänninen and published by Springer Science & Business Media. This book was released on 2011-06-21 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lanthanides have fascinated scientists for more than two centuries now, and since efficient separation techniques were established roughly 50 years ago, they have increasingly found their way into industrial exploitation and our everyday lives. Numerous applications are based on their unique luminescent properties, which are highlighted in this volume. It presents established knowledge about the photophysical basics, relevant lanthanide probes or materials, and describes instrumentation-related aspects including chemical and physical sensors. The uses of lanthanides in bioanalysis and medicine are outlined, such as assays for in vitro diagnostics and research. All chapters were compiled by renowned scientists with a broad audience in mind, providing both beginners in the field and advanced researchers with comprehensive information on on the given subject.

Download or read book Luminescence of Lanthanide Ions in Coordination Compounds and Nanomaterials written by Ana de Bettencourt-Dias and published by John Wiley & Sons. This book was released on 2014-09-08 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive book presents the theoretical principles, current applications and latest research developments in the field of luminescent lanthanide complexes; a rapidly developing area of research which is attracting increasing interest amongst the scientific community. Luminescence of Lanthanide Ions in Coordination Compounds and Nanomaterials begins with an introduction to the basic theoretical and practical aspects of lanthanide ion luminescence, and the spectroscopic techniques used to evaluate the efficiency of luminescence. Subsequent chapters introduce a variety of different applications including: • Circularly polarized luminescence • Luminescence bioimaging with lanthanide complexes • Two-photon absorption of lanthanide complexes • Chemosensors • Upconversion luminescence • Excitation spectroscopy • Heterometallic complexes containing lanthanides Each chapter presents a detailed introduction to the application, followed by a description of experimental techniques specific to the area and an extensive review of recent literature. This book is a valuable introduction to the literature for scientists new to the field, as well as providing the more experienced researcher with a comprehensive resource covering the most relevant information in the field; a ‘one stop shop’ for all key references.

Download or read book Synthesis and Characterization of New Lanthanide Chalcogenides written by Geng Bang Jin and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Highly Luminescent Lanthanide Complexes with Specific Coordination Structures written by Kohei Miyata and published by Springer Science & Business Media. This book was released on 2014-04-08 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis deals with strongly luminescent lanthanide complexes having novel coordination structures. Luminescent lanthanide complexes are promising candidates as active materials for EL devices, lasers, and bio-sensing applications. The organic ligands in lanthanide complexes control geometrical and vibrational frequency structures that are closely related to the luminescent properties. In most of the previous work, however, lanthanide complexes have high-vibrational frequency C–H units close to the metal center for radiationless transition. In this thesis, the luminescent properties of lanthanide complexes with low-vibrational frequency C–F and P=O units are elucidated in terms of geometrical, vibrational, and chemical structures. The author also describes lanthanide coordination polymers with both high thermal stability (decomposition point > 300°C) and strong-luminescent properties (emission quantum yield > 80%). The author believes that novel studies on the characteristic structures and photophysical properties of lanthanide complexes may open up a frontier field in photophysical, coordination and material chemistry.

Download or read book Synthesis Characterization and Luminescence Properties of Pr3 Nd3 Eu3 and Gd3 Complexes with Curcumin Pyrazole written by Ruokuosenuo Zatsu and published by . This book was released on 2020 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of new lanthanide complexes [LnCl 3 . xH 2 O:(L) 3 ] (where; L = curcumin pyrazole and Ln = Pr 3+ , Nd 3+ , Eu 3+ and Gd 3+ have been synthesized in ethanol under reflux conditions for 24 h. The synthesized complexes were characterised by elemental analysis, IR, UV-Vis, fluorescence and TGA. The formations of the nona-coordinated lanthanide complexes have been detected through elemental analysis. In IR-spectra, the formation of the new band at 460 cm -1 could convey the mode of co-ordination of nitrogen atom to the lanthanide. Absorption intensity as well as luminescence properties of the synthesised complexes were analysed through UV-Vis and fluorescence spectra to reveal the formation of complexes. The percentage weight loss of the complexes was studied with TGA analysis to check the thermal stability of the complexes. Further the quantum yields of the ligand and lanthanide complexes have been analyzed to study their comparative luminescence properties.

Download or read book Synthesis and Characterization of Lanthanide Complexes with Phenalenide and Aromatic fused Cyclopentadienyls as Ligands written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The synthesis of yttrium phenalenide complexes 129-132 was achieved by salt metathesis reactions between ligand anions and YCI3. Ytterbium phenalenide complexes 133-137 were synthesized by protonolysis reactions between neutral ligands and Yb[N(SiMe3)2]2(THF)2. The solid state structure of (Pni1Bu)2Yb(THF) 136 reveals a unique n3 bonding pattern, however the electrons of the phenalenide ligand remain delocalized even when bonded to the metal center. Mono-alkyl complexes (PCpR)2Y(CH2SiMe3)(THFSiMe3)(THF) 147-149 (R = Me. Ph. H) and bis-alkyl complexes (PCp*)Y(CH2SiMe3)2(THF) 150 and (sCp)Y(CH2SiMe3)2(THF) 152 were synthesized by direct protonolysis reactions between Y(CH2SiMe3)3(THF)2 and neutral ligands. When treated with phenylsilane, complex 148 generated the crowded hydride dimer [(PCpPh)2Y(u-H)]2 161. Complexes 150 and 152 undergo acid-base. metallation. insertion reactions and polymerization of small substrates. A variable temperature `H NMR study of 150 and 152 at low temperature reveals an equilibrium between 150/152-THF and 1501152. The THF-free complexes. 150/152-THF. appear to undergo inversion of a pyramidal ground state structure to generate a C2 symmetric intermediate. The X-ray structures of 136, 147, 150. 152, (sCp)Y(CH2SiMe3)2(bipy) 154, 161. [PCp*Y(CCSiMe3)(THF)]2(u2-CCSiMe3)2] 167, acetylide cluster 169 and bis-(Me3Si)2Cp yttrium chloride dimer 176 were determined and structural features discussed.

Download or read book Assembled Lanthanide Complexes with Advanced Photophysical Properties written by Yuichi Hirai and published by Springer. This book was released on 2018-04-07 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis provides essential information on the systematic design of assembled lanthanide complexes for functional luminescent materials. It discusses the relationships between assembled structures and photo, thermal, and mechanical properties on the basis of crystallography, spectroscopy, and thermodynamics. The described guidelines for assembled structures will be extremely valuable, both for industrial applications and for readers’ fundamental understanding of solid-state photophysics and materials chemistry. Luminescent lanthanide complexes are promising candidates for lighting devices, lasers, and bio-probes owing to their line-like and long-lived emission arising from characteristic 4f–4f transitions. Low-vibrational and asymmetrical coordination structures around lanthanide ions have been introduced to achieve strong luminescence, using specific organic ligands. Recently, assembled lanthanide complexes including coordination polymers and metal organic frameworks have increasingly attracted attention as a new class of luminescent materials offering thermal stability and color tunability. However, improving the luminescence efficiencies of these compounds remains a challenge, and specific molecular designs to control assembled structures and yield additional physical properties have not been established. The author provides a group of bent-angled bridging ligands to boost photoluminescence efficiency, and successfully introduces for the first time glass formability and strong triboluminescence properties.

Download or read book Luminescence of Lanthanide Ions in Coordination Compounds and Nanomaterials written by Ana de Bettencourt-Dias and published by John Wiley & Sons. This book was released on 2014-11-17 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive book presents the theoretical principles, current applications and latest research developments in the field of luminescent lanthanide complexes; a rapidly developing area of research which is attracting increasing interest amongst the scientific community. Luminescence of Lanthanide Ions in Coordination Compounds and Nanomaterials begins with an introduction to the basic theoretical and practical aspects of lanthanide ion luminescence, and the spectroscopic techniques used to evaluate the efficiency of luminescence. Subsequent chapters introduce a variety of different applications including: • Circularly polarized luminescence • Luminescence bioimaging with lanthanide complexes • Two-photon absorption of lanthanide complexes • Chemosensors • Upconversion luminescence • Excitation spectroscopy • Heterometallic complexes containing lanthanides Each chapter presents a detailed introduction to the application, followed by a description of experimental techniques specific to the area and an extensive review of recent literature. This book is a valuable introduction to the literature for scientists new to the field, as well as providing the more experienced researcher with a comprehensive resource covering the most relevant information in the field; a ‘one stop shop’ for all key references.

Download or read book Synthesis Structural and Spectroscopic Characterization of New Polychalcogenide Complexes of Indium and Thallium and Their Applicaton as Precursors to Solid State Materials written by Sandeep S. Dhingra and published by . This book was released on 1992 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: