Synthesis, Photophysical and Biological Studies of Lanthanide Complexes for Photodynamic Therapy PDF Download
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Author: Yan Zhou
Publisher:
ISBN:
Category : Photochemotherapy
Languages : en
Pages : 191
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Photodynamic therapy (PDT) is a promising therapeutic approach for cancer therapy, however, poor tumor selectivity and low penetration depth of light have always limited its function during medical treatment. The goal of my study was to develop a new generation of PDT agents to overcome the above restraints in current PDT cancer therapy. We have synthesized three series of porphyrinate lanthanide complexes to target cancer receptors αvβ3 integrin isoform for bladder cancer and phospholipid anionic membrane for lung and prostate cancers.
Author: Yan Zhou
Publisher:
ISBN:
Category : Photochemotherapy
Languages : en
Pages : 191
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Book Description
Photodynamic therapy (PDT) is a promising therapeutic approach for cancer therapy, however, poor tumor selectivity and low penetration depth of light have always limited its function during medical treatment. The goal of my study was to develop a new generation of PDT agents to overcome the above restraints in current PDT cancer therapy. We have synthesized three series of porphyrinate lanthanide complexes to target cancer receptors αvβ3 integrin isoform for bladder cancer and phospholipid anionic membrane for lung and prostate cancers.
Author: Elisavet Lambidis
Publisher:
ISBN:
Category : Electronic books
Languages : en
Pages : 116
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Book Description
Nowadays the necessity for designing and synthesizing novel imaging agents increases rapidly. The long wavelength, and thus, low energy, of excitation and emission, and the good specificity and stability are examples of essential characteristics of ideal diagnostic and therapeutic agents. In this work, the synthesis and photophysical studies of metal complexes for biological applications were performed and evaluated, and it contained the development of (a) a porphyrin probe for imaging and treatment and (b) a tripodal thermal sensor for imaging. The research and study of the two cases of complex is analyzed in the second and third chapters, respectively, which follow the introduction or literature review to the diagnostic and/ or therapeutic agents which is given with examples in the first chapter. The scope of the main project, which is analysed in the second chapter, was the development and synthesis of a porphyrin-based bio-probe capable of bacterial fluorescence imaging. The porphyrin moiety of a complex is also able to generate singlet oxygen and this effect can be used for treatment purposes (PDT, Photodynamic Therapy). Thus, the complex can act as a diagnostic and therapeutic (anti-bacterial in this case) agent simultaneously. A probe with such a dual capability is known as theranostic agent. A theranostic agent is crucial for the enhancement and expansion of personalised medicine. The studies and physical measurements of the proposed, synthesised porphyrin complex have proved its capability to be used as a theranostic probe. Furthermore, after coupling the porphyrin moiety firstly with a small protein part (ampetoid: antimicrobial peptoid) and secondly with a radionuclide (Gallium-68), the in vitro and in vivo studies have to be performed. The aim of the project analysed in the third chapter was the development of a thermal sensor. Coordination of a tripodal ligand with a mixture of two lanthanides in various ratios was achieved and the photophysical measurements of the resulted complexes were evaluated. Lanthanide metals were chosen due to their unique photophysical properties that they offer when they are connected to an organic chomophoric ligand. Additionally, the preferred final luminophore product would obey a thermostable structure over a wide temperature range and it would be capable of effectively sensing the alterations in temperature. These properties were true for the ratio 99.5:0.5 for Terbium: Europium, and thus, the complex with such a consistency clarified the final product. Furthermore, the highly promising results after repeatedly photophysical (especially emission) measurements could conclude that the complex can be served as an ideal thermal sensor. Additional emission measurements at higher temperatures have to be done in order to confirm the ability of the proposed thermal sensor to be used for bio-imaging purposes. In conclusion, two-kind of metal complexes for biological applications were synthesized and their photophysical properties were assessed. Both the bulky porphyrin complex and the smaller tripodal ligand have shown promising results for their proposed applications. Of course, a more detailed assessment is required to verify their capability.
Author: Pekka Hänninen
Publisher: Springer Science & Business Media
ISBN: 3642210236
Category : Science
Languages : en
Pages : 392
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Book Description
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.
Author: Ka-Leung Wong
Publisher: Open Dissertation Press
ISBN: 9781361426586
Category :
Languages : en
Pages :
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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
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Ga-lai Law (Ph. D.)
Publisher:
ISBN:
Category : Lanthanum compounds
Languages : en
Pages : 612
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Author: 黎寶韻
Publisher: Open Dissertation Press
ISBN: 9781374698178
Category :
Languages : en
Pages :
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This dissertation, "Synthesis, Structural Characterization and Photophysical Properties of Lanthanide Complexes Containing Polydentate Amide Ligands" by 黎寶韻, Po-wan, Lai, 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. DOI: 10.5353/th_b4257618 Subjects: Lanthanum compounds Amides Ligands Photochemistry
Author: Raymond Bonnett
Publisher: CRC Press
ISBN: 1482296950
Category : Science
Languages : en
Pages : 322
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Book Description
Photodynamic therapy (PDT) is a ground breaking medical technique which uses lasers to activate light-sensitive chemicals to treat cancer and other diseases without resorting to surgery. For the first time, Chemical Aspects of Photodynamic Therapy introduces in an accessible way the physics, chemistry and biology behind the technique. This highly a
Author: Yuichi Hirai
Publisher: Springer
ISBN: 9811089329
Category : Science
Languages : en
Pages : 115
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Book Description
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.
Author: Wai Sum Lo
Publisher:
ISBN:
Category : Rare earth metals
Languages : en
Pages : 279
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Book Description
As Sm(III) is dual-emissive - emitting in both the visible and NIR regions, the NIR photophysical properties were investigated. Originating from the same emitting state as the visible luminescence transitions, the NIR transitions were studied and compared. In addition to solvatochromic studies, this chapter discusses the validity of the energy gap law in estimating the extent of quenching by high energy oscillators and thus provide a blueprint for maximizing the intrinsically weak NIR luminescence by manipulating the coordination environment. NIR luminescence from the ytterbium(III) complex was also presented, as the energy transfer mechanism of Yb(III) has always been sort of an enigma due to the large energy difference between the Yb(III) only excited state and the donating state of common antennae. Chapter five focuses on the syntheses of a multidentate water-soluble pocket for lanthanide(III) complexes. The ligand system extends the aforementioned studies by using a single multi-chelate in place of multiple tri-/bi-dentate ligands as an effort to increase the stability of the complexes in solution state and thus creates a platform for exploring the non-triplet ILCT energy transfer pathway for lanthanide(III) luminescence sensitization in water to expand the scope of potential applications.
