SYNTHESIS, CHARACTERISTICS, OF MIXED LIGAND COMPLEX OF ZN(II) ION WITH 8-HYDROXYQUINOLINE AND BENZOIC ACID
CHAPTER ONE
1.0 Introduction
1.1 Background of Study
With the rate at which population is increasing and the usage of fossil fuels, the need for alternative and sustainable energy development has become a necessity. There is therefore need for energy saving materials that are affordable and that pose no threat to our environment. Areas of interests such as fuel cells, batteries, capacitors, solar cells, etc. afford much opportunity for improvement and research focus. (Lacey et al., 2014).
Detection of hazardous materials is a significant concern for homeland security, and portable sensors are potentially desirable to avoid the complexity of such materials, such as explosives. Luminescent metal organic frameworks (MOFs) are potentially useful as chemically-selective sensors.The study of luminescence behaviour in metal organic frameworks is an active area of research in inorganic chemistry. A large numberof 3d element have been employed to investigate the ligand luminescence. The most commonly reported metal organic framework structures are based on Zn2+ and Cd2+ ions, which have filled d orbitals and thus d–d transitions are not possible.
In these compounds, intra-ligand and/or ligand metal charge transfer effects have been observed. The photoluminescence studies are important to understand the charge-transfer pathways. The studies on the luminescence behavior in MOFs clearly indicate that the energy transfer from the organic ligands to the metal center is easy. The life-time studies also suggest that the excited state possess considerable stability and allows for exploitation in many important applications. (Zhou, X et al., 2009; Konar et al., 2013).
Metal-organic frameworks (MOFs), also known as metal-organic networks, or coordination polymers, represent a new class of compounds containing metal ions linked by organic bridging ligands. A metal-organic framework (MOF) material can be thought of as the composition of two major components: a metal ion (or cluster of metal ions) and an organic molecule called a linker (or bridging ligands).
Metal ions + Organic linkers -> Coordination polymers/ MOFs
The organic ligands or linkers are groups that can donate multiple lone pairs of electrons (polydendate) to the metal ions, whereas the metal ions are made up of vacant orbital shells that can accept these lone pairs of electrons to form a metal-organic framework material.
Metal-organic framework materials are well-defined, adjustable and highly porous materials, with spatial confinement, often crystalline, sensitive to air and resistant to structural collapse upon heating. (Zang et al., 2006).
1.1.1 Metal-Organic Frameworks as Functional Materials
Early research in MOFs tended to concentrate on synthesis of a wide variety of new compounds with novel topologies and compositions. Although the design of new structures remains highly topical and a significant amount of research efforts are still devoted to the discovery of unprecedented network topologies, the primary motivation in crystal engineering of MOFs has shifted toward constructing materials that possess specific physical properties and supramolecular functions, such as catalysis, gas storage, luminescence, nonlinear optical properties (NLO), and magnetism. Photoluminescence is a form of luminescence. Phosphors are luminescent materials that emit light when excited by radiation, and are usually microcrystalline powders or thin-films designed to provide visible color emission. It is a light emission from any form of matter after the absorption of photons. It is a process whereby molecules absorb, stores and emits light and is initiated by photo excitation. (Shinde et al., 2013)
1.2 Synthesis of Metal Organic Framework
Two methods are adopted, namely:
- Conventional:
Conventional synthesis is frequently performed by solvothermal methods; i.e. heating a mixture of organic linker and metal salt in a solvent system. The materials produced from this method are thermally unstable or reactive to solvent used, and this could lead to breaking of bonds or creation of metal sites for guest species such as gases to gain access into the framework’s micropores. In some cases, assisted microwave-solvothermal synthesis can be used, to monitor or regulate the temperature whilst the reaction is in progress. Precipitation and crystallization follows immediately after heating a mixture of a chosen metal ion and organic linker in the presence of a solvent. Thereafter, filtration and drying follows. Slow evaporation method is a conventional method and is advantageous because the crystals assemble themselves though it is time consuming (Tella et al., 2012).
- Unconventional Methods:
Unconventional Synthesis is frequently performed by grinding a mixture of organic linker and metal salt in an agate mortar and pestle or in a ball mill and in the absence of solvent. This method is known as mechanochemical method. The metal sites are exposed when the mixture is gently heated, thus allowing gases such as hydrogen to bind at these sites. The mechanochemically initiated reactions are comparable to those of solvent reactions. The method is known to be environmentally friendly and can possibly give high yield of products (Alex et al., 2005; Tella et al., 2012).
1.2.2 Chemistry of 8-Hydroxyquinoline
8-hydroxyquinoline is an organic compound with the formula C9H7NO. It is a derivative of the heterocyclic quinoline by placement of an OH group on carbon number 8. It is a monoprotic bidentate chelating agent. 8-hydroxyquinoline has a hydrogen atom that is replaceable by a metal, and a heterocyclic nitrogen atom, which forms with these metals a five membered ring. It forms stable complexes with several metal ions.(Sharet al., 2005)
CHAPTER TWO
2.0 Literature Review
2.1 Introduction
The review of relevant literature is the main topic of this chapter. A literature review covers theoretical and methodological contributions to a certain issue in addition to the state of knowledge at the time of writing. It provides information about the state of the art in relation to the subject you are writing about. It examines the body of work on the chosen subject. The literature evaluation in this study comprises the …
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TABLE OF CONTENTSPRELIMINARY PAGES
- Title page
- Approval page
- Dedication
- Acknowledgement
- Table of Contents
- Abstract
INTRODUCTION
- 1.0 Introduction
- 1.1 Background …
- ⋮
LITERATURE REVIEW
- 2.1 Introduction
- ⋮
CHAPTER THREE
MATERIALS AND METHODS
- 3.1 Introduction
- ⋮
CHAPTER FOUR
RESULTS AND DISCUSSION
- 4.1 Introduction
- 4.2 Results
- ⋮
- 4.3 Discussion of Findings
CHAPTER FIVE
SUMMARY, CONCLUSION AND RECOMMENDATION
- 5.1 Introduction
- 5.2 Summary
- 5.3 Conclusion
- 5.4 Recommendation
REFERENCES
Disclaimer for Complete Material Utilization
The displayed research work titled "Synthesis, Characteristics, of Mixed Ligand Complex of Zn(ii) Ion with 8-Hydroxyquinoline and Benzoic Acid" is stated as a research guideline towards accomplishing your assigned project / seminar research work. All the research materials on this website are ONLY for research purposes and should be used as a guideline in developing your research work. For no reason should you copy word for word as projectlist.com.ng will not be liable for any who copied the material. By ordering the complete research guideline, it signifies that you've accepted our terms of service.
PRELIMINARY PAGES
- Title page
- Approval page
- Dedication
- Acknowledgement
- Table of Contents
- Abstract
INTRODUCTION
- 1.0 Introduction
- 1.1 Background …
- ⋮
LITERATURE REVIEW
- 2.1 Introduction
- ⋮
CHAPTER THREE
MATERIALS AND METHODS
- 3.1 Introduction
- ⋮
CHAPTER FOUR
RESULTS AND DISCUSSION
- 4.1 Introduction
- 4.2 Results
- ⋮
- 4.3 Discussion of Findings
CHAPTER FIVE
SUMMARY, CONCLUSION AND RECOMMENDATION
- 5.1 Introduction
- 5.2 Summary
- 5.3 Conclusion
- 5.4 Recommendation
REFERENCES
Disclaimer for Complete Material Utilization
The displayed research work titled "Synthesis, Characteristics, of Mixed Ligand Complex of Zn(ii) Ion with 8-Hydroxyquinoline and Benzoic Acid" is stated as a research guideline towards accomplishing your assigned project / seminar research work. All the research materials on this website are ONLY for research purposes and should be used as a guideline in developing your research work. For no reason should you copy word for word as projectlist.com.ng will not be liable for any who copied the material. By ordering the complete research guideline, it signifies that you've accepted our terms of service.
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