Download or read book Molecular Machines Design Synthesis and Characterization written by Oumaima Aiboudi and published by . This book was released on 2023* with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Design Synthesis and Characterization of Crystalline Molecular Machines with High Structural and Dynamic Complexities written by Xing Jiang and published by . This book was released on 2016 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular machines are molecular and supramolecular entities capable of producing quasi-mechanical movements. While many examples of functional artificial molecular machines have been studied in solution, crystalline aggregates of molecular machines have been explored infrequently because of the limited freedom of motion in closely packed solids. Although previous work on amphidynamic crystals has demonstrated that rotational dynamics in crystals could be achieved and engineered by proper structural design, the existing examples are limited to simple structures and small dynamic groups. As part of the efforts to prepare artificial molecular machines capable of performing useful work, the goals of my doctoral research were to design and synthesize crystalline molecular rotors with complex structures and explore their dynamics with solid-state NMR spectroscopy. I have prepared two shape-persistent dendritic molecular rotors with molecular weight over 2000 Da by different synthetic strategies. The molecular rotor prepared by a convergent synthesis provided crystals with a low packing density, which allowed megahertz rotation of all aromatic groups in the rotor. The softening of local environments with temperature, resulting from the dynamics of virtually all components in the crystal, led to a new concept of crystal fluidity. The divergent strategy used in the synthesis of the other macromolecular rotor made it possible to incorporate large rotator groups in the structure. When a bulky triptycene group was used, the shape-persistent rotor was able to support its kilohertz rotation in a semicrystalline sample. In order to realize faster triptycene rotations and to understand the structural elements required for effective solid-state gearing motions, I designed and prepared three pillared paddlewheel MOFs. I demonstrated that megahertz rotation of triptycene could be realized in a catenation-free framework, which offered a loose environment for the rotator. Since the rotator is in close contact only with the solvent molecules, its rotation is dictated solely by the hydrodynamic behavior of DMF and constitutes a diffusion-controlled process. As a result, the temperature dependence of observed rotation could shed light on the effective viscosity change of trapped solvents with temperature.
Download or read book Design Synthesis and Characterization of new Supramolecular Architectures written by Massimo Baroncini and published by Springer Science & Business Media. This book was released on 2011-04-15 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis focuses on the bottom-up design, construction and operation of supramolecular systems capable of behaving as devices and machines on the molecular scale, which is a topic of great interest in nanoscience and a fascinating challenge in nanotechnology. In particular, the systems investigated here include: polyviologen dendrimers capable of behaving as hosts and chargestoring devices; molecular machines based on pseudorotaxanes/rotaxanes and operated by photoinduced proton transfer, or photoisomerization reactions; and a simple unimolecular multiplexer/demultiplexer. The systems have been characterized using a variety of techniques including absorption and emission spectra, laser flash photolysis, NMR spectroscopy, electrochemical experiments, stopped flow measurements. This research addresses a large number of open problems in the nanosciences, dealing with a wide range of the most advanced applications of supramolecular systems.
Download or read book Molecular Machines written by T. Ross Kelly and published by Springer Science & Business Media. This book was released on 2005-12-20 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: The chapters in this volume describe bottom-up strategies and chronicle cutting-edge advances from several of the world’s leading laboratories engaged in the development of molecular machines. The Nobel Prize in Chemistry 2016 was awarded jointly to Jean-Pierre Sauvage, Sir J. Fraser Stoddart and Bernard L. Feringa "for the design and synthesis of molecular machines". Both Jean-Pierre Sauvage and Sir J. Fraser Stoddart have also contributed to this book.
Download or read book Towards Molecular Machines and Switches in the Solid State written by Tinh-Alfredo V. Khuong and published by . This book was released on 2001 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molecular Self assembly written by Matthew S. Lamm and published by ProQuest. This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molecular Machines and Motors written by J.-P. Sauvage and published by Springer. This book was released on 2003-09-04 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: This series presents critical reviews of the present position and future trends in modern chemical research. It consists of short and concise reports on chemistry, each written by the world’s renowned experts, and still valid and useful after 5 or 10 years.
Download or read book Design Synthesis and Characterization of Amphiphilic Molecules for Biomedical Applications written by Yingyue Zhang and published by . This book was released on 2016 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On the Systematic Design and Analysis of Artificial Molecular Machines written by Pouya Tavousi and published by . This book was released on 2016 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Concepts For Molecular Machines written by Jubaraj Bikash Baruah and published by World Scientific Publishing Company. This book was released on 2017-08-11 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Actions of living beings at any stage of life are of general interest; molecular machines can be a replica of such activities. Stimuli guided movements and shape changes of molecules are one of the rapidly developing areas on which fundamental principles of molecular machine banks. Thus, the understanding of intriguing concepts of molecular machines is essential. Miniaturization, efficiency, stability and robustness in performing activities are some of the important points associated with molecular machines. Using molecular machines for practical purposes will further strengthen fundamentals of science and technology and also guide future market economy. Recent advent of techniques to handle materials at microscopic level has benefited the topic of molecular machines and is ready to be taken to a higher level as compared to other competing topics of science and technology. Molecular machines is a contemporary hot topic with future scope. The Nobel Prize in the year 2016 was shared by three scientists Prof. Ben Feringa, Prof. J Fraser Stoddart and Prof. Jean-Pierre Sauvage for their contribution to the topic. This book on molecular machines is aimed to cater to the need of graduate students and researchers by providing the fundamental aspects on molecular machines.
Download or read book Studies on Structures and Dynamics of Polarizable Crystalline Solids written by Zhiyu Liu and published by . This book was released on 2022 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular machines have become the focus in field of physical organic chemistry given the advances in synthesis and characterization in recent decades. Identifying motions in molecular machines thus become key knowledge that researchers need in order to design and understand molecular machines. Even though molecular machines such as ATP synthase are universal in nature, designing molecular machines with complex functions remains a great challenge. To achieve such goals, one must explore basic machine functions, such as gearing, translation, locking and rotation, at the molecular level. In this dissertation, rotations are investigated under different scenarios. By virtual of modern solid-state characterization techniques and computer programs, fast rotations of molecular components in several Metal-Organic Frameworks and molecular crystals have been identified. Such knowledge is necessary to further explore emergent properties in crystalline materials and complex molecular machine functions. Chapter One is introduction of polarizable amphidynamic crystals, characterization methods, mechanisms and applications. Chapter Two describes an investigation of an open-pore Zn Metal-Organic Frameworks featuring difluorophenylene dipole and triptycene dicarboxylic acid. After discovering that the Zn MOF cannot maintain its structure upon removal of guest molecules, we sought to explore another more stable MOF system. Chapter Three describes an air-stable interpenetrated zirconium MOFs with dipoles. Solid-state NMR data and dielectric data are analyzed in depth to reveal the unique dynamics in such system. To further enhance the dipolar self ordering and simplify the structure, a dinitro derivative is also synthesized the results are recorded. Chapter Four includes the dynamics of a dumb-bell shape tribenzotriquinacene crystalline molecular rotor both experimentally and computationally. Chapter Five describes explorations on amphidynamic MOFs towards different topologies in order to achieve lattice of lower symmetry or frustrated dipolar array.
Download or read book Design Synthesis and Characterization of Novel Functional Rod like and Disc shaped Molecules written by Wenmiao Shu and published by . This book was released on 2001 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Reactivity of Para Substituted Oxovanadium V oxacalix 3 arenes Design and Synthesis of Molecular Machines Via Poly N isopropylacrylamide Copolymers written by Michael J. Fallbach and published by . This book was released on 2003 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Beyond the Molecular Frontier written by National Research Council and published by National Academies Press. This book was released on 2003-03-19 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemistry and chemical engineering have changed significantly in the last decade. They have broadened their scopeâ€"into biology, nanotechnology, materials science, computation, and advanced methods of process systems engineering and controlâ€"so much that the programs in most chemistry and chemical engineering departments now barely resemble the classical notion of chemistry. Beyond the Molecular Frontier brings together research, discovery, and invention across the entire spectrum of the chemical sciencesâ€"from fundamental, molecular-level chemistry to large-scale chemical processing technology. This reflects the way the field has evolved, the synergy at universities between research and education in chemistry and chemical engineering, and the way chemists and chemical engineers work together in industry. The astonishing developments in science and engineering during the 20th century have made it possible to dream of new goals that might previously have been considered unthinkable. This book identifies the key opportunities and challenges for the chemical sciences, from basic research to societal needs and from terrorism defense to environmental protection, and it looks at the ways in which chemists and chemical engineers can work together to contribute to an improved future.
Download or read book Cyanobacterial Biotechnology written by G. Subramanian and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume comprises select papers presented at a symposium held in September, 1996 in India. The contributors used the forum to disseminate their research findings.
Download or read book Molecular Devices and Machines written by Vincenzo Balzani and published by John Wiley & Sons. This book was released on 2008-04-09 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Targeted at a broad audience ranging from chemists and biochemists to physicists and engineers, this book covers advanced research while being written in an easily understandable language accessible to any interested researcher or graduate student. Following an introduction to the general concepts, the authors go on to discuss devices for processing electrons and electronic energy, memories, logic gates and related systems, and, finally, molecular-scale machines.
Download or read book Synthesis and Design of Small Molecule Based Functional Materials Applications in Lithium Ion Batteries and Molecular Machines written by Geeta Vadehra and published by . This book was released on 2016 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid-state organic chemistry is a broad topic with a wide variety of materials applications. This dissertation focuses on two very different applications, and should be considered in two separate parts. Part One focuses on the use of organic compounds as electrode materials in lithium ion batteries (Chapters Two and Three) and Part Two focuses on the design of molecular rotors for their applications in molecular machines (Chapters Four and Five). Part One. The application of organic redox reactions in lithium ion batteries is a relatively unexplored topic. Though first examined in the early 1970s, the field was quickly abandoned in favor of inorganic insertion compounds, which showed more desirable redox potentials and lower solubility in typical organic electrolyte solvents. As such, these metal oxides have dominated the field ever since. However, while these compounds show impressive performance, they are plagued with unavoidable environmental consequences of their continued use. Organic alternatives provide a useful platform to circumventing this, which has sparked a resurgence of interest in the last decade in addressing the two issues mentioned above. Chapter Two. The redox potentials demonstrated in organic redox reactions most often fall approximately halfway between those displayed by traditional cathode and anode materials--meaning that applying these to either would cut the cell voltage in half. However, as this is an effect of the electronics of the process, it follows that controlling the electronics would control this. Naphthalene diimides provide an ideal model to explore the effects of probing the electronics of the material based on their low solubility and redox capabilities. In this chapter, the synthesis and characterization of a family of naphthalene diimide derivatives is documented, along with the tunability of the electronics of the redox process based on substituent effects and the subsequent control that can be exhibited on the experimental discharge potentials. Chapter Three. The motivation for exploring the redox capabilities of organic compounds for electrodes to replace the inorganic insertion compounds that currently dominate the field is largely based on the environmental implications of the current materials. A recent discovery that a furan backbone can be accessed in highly sustainable methods provided an environmentally friendly synthesis of furan dicarbonyl derivatives such that their electrochemical activity could be characterized. Part Two. Analogous to their macroscopic counterparts, a machine on the molecular scale requires the cooperative movement of its parts. The Garcia-Garibay group has developed the design of the molecular gyroscope, which, like a macroscopic gyroscope, has both stationary and rotating parts. However, incorporation of this motion into the solid requires control not just with regard to molecular design, but, also with regard to crystal packing. In the context of the molecular gyroscope, this means that in order for the rotating component to rotate, sufficient free volume around it is required. Chapter Four. While the inability to predict crystal packing remains a major obstacle in the field of crystal engineering, it has been shown that the use of hexamethyl triptycene as the stator portion can allow for an optimal packing arrangement of the rotor molecules. However, closer inspection of the crystal structure revealed that the free volume discussed above, was actually filled by crystallographically defined solvent molecules. Despite this, the system demonstrated impressive rotational dynamics. Given the dynamics of this system in combination with analysis of the crystal structure demonstrated the presence of a correlated motion analogous to a macroscopic "gearing" system. This chapter documents synthetic advances that allow access to this system efficiently such that appreciable quantities of this rotor and a variety of its derivatives can be accessed in order to fully characterize their rotation dynamics. Preliminary data showing qualitative evidence of a correlated motion are presented, but studies are still ongoing. Chapter Five. Inspired by the work discussed in the previous chapter, it followed that while iptycene based stators would often lead to rotors with a tendency to interdigitate, peripheral substitution was a promising strategy to overcome this obstacle. Despite this, traditional strategies of synthesizing these compounds were considerably too long and low yielding to be practical for further study. With this in mind, this chapter documents the development of an efficient, high yielding method for late stage installation of peripheral substitution that can be applied not just to triptycenes, but also to pentiptycenes.
