This work gives an overview over core modified Porphyrinoids. Specifically: Smaragdyrins, Expanded Porphyrinoids and Corroles. It does so by, in two chapters, defining each of the aforementioned chemical combinations´ synthesis and characterization, properties and respective dyads.
Smaragdyrin is a pentapyrrolic 22π-electron expanded porphyrin system bearing two direct pyrrole-pyrrole bonds. This macrocycle and its core modified derivative i.e. 25-oxasmaragdyrin have received upsurge interest in recent years due to their notable optical and electrochemical properties. Corroles are aromatic tetrapyrrolic macrocycles containing one meso carbon less compared to porphyrins and have one direct pyrrole-pyrrole linkage. This class of macrocycle possesses novel spectral, electrochemical and luminescence properties that can be exploited in material applications. In this book, we have discussed the synthesis, properties and their limited coordination chemistry of expanded porphyrinoid 25-oxasmaragdyrin and core-modified corroles.
Corroles, on the other hand, are tetrapyrrolic contracted porphyrins, fully conjugated 18π electron macrocyles containing three methine bridges and one direct pyrrole-pyrrole linkage.
Table of Content
Chapter I: Smaragdyrins and Expanded porphyrinoids
1.1 Introduction
1.2 Smaragdyrin
1.3 Synthesis and characterization
1.4 Metal and Non-metal Complexes of Smaragdyrin
1.5 Properties of Smaragdyrin
1.6 Smaragdyrin Based Dyads and Triad
Chapter II: Core-modified Corroles
2.1 Introduction
2.2 Synthesis of Core-modified corrole
2.3 Spectral Properties of Corroles
2.4 Corrole Based Dyads
Objectives and Research Themes
This work provides an in-depth examination of core-modified porphyrinoids, specifically focusing on the synthesis, structural properties, and potential applications of smaragdyrins and core-modified corroles in materials science and molecular electronics.
- Structural diversity and modifications of macrocyclic systems
- Synthesis and characterization of smaragdyrins and their derivatives
- Photophysical properties and energy transfer in dyads and triads
- Development of core-modified corroles and their metal complexes
Excerpt from the Book
1.1 Introduction
Porphyrins are a class of macrocycle with 18 π electron conjugated system consisting four heterocyclic rings connected by methine bridges with each other. Porphyrins and metalloporphyrins present at the active site of numerous biomolecules play an important role in living systems. Corroles are porphyrin analogues, tetrapyrrolic in nature, aromatic, and possesses contracted cavity due to absence of one meso bridged carbon atom connecting the heterocycles. In nature, porphyrins occur in various forms such as chlorin in chlorophyll pigments; as prosthetic heme group surrounded by the protein units in hemoglobin; as corrin in vitamin B12 etc. Some of the notable biological roles served by porphyrin and its metal derivatives include electron transfer in cytochromes, radical generation in photosynthesis, oxygen storage and transport in myoglobin and hemoglobin in living organisms. In addition, porphyrins and related macrocycles provide an extremely versatile synthetic base for a variety of materials applications. Porphyrins and metalloporphyrins have broad range of applications as field-responsive materials, particularly for optoelectronic applications.
Summary of Chapters
Chapter I: Smaragdyrins and Expanded porphyrinoids: This chapter reviews the structural diversity of expanded porphyrinoids, focusing specifically on the synthesis, properties, and complexation of smaragdyrins and their application in multiporphyrin arrays.
Chapter II: Core-modified Corroles: This chapter explores the synthesis and unique spectral features of core-modified corroles, highlighting their potential as functional materials and their role in creating meso-meso linked dimers.
Keywords
Porphyrins, Smaragdyrins, Corroles, Core-modified porphyrinoids, Macrocycles, Molecular electronics, Photodynamic therapy, Fluorescence, Metal complexes, Energy transfer, Synthesis, Aromaticity, Optoelectronic applications, Dyads, Conjugation.
Frequently Asked Questions
What is the primary focus of this work?
The work focuses on the chemistry, synthesis, and applications of core-modified porphyrinoids, specifically smaragdyrins and corroles.
What are the central themes discussed?
The central themes include the structural modification of macrocyclic rings, photophysical characterization, and the development of sensors and functional materials.
What is the main goal of the research?
The primary goal is to provide a comprehensive overview of how core-modification affects the electronic and structural properties of these tetrapyrrolic systems.
Which scientific methods are utilized?
The research relies on chemical synthesis techniques such as acid-catalyzed condensation, coupled with structural characterization methods like NMR spectroscopy and X-ray crystallography.
What topics are covered in the main section?
The main sections cover the synthesis of smaragdyrin derivatives, the formation of dyads and triads for energy transfer, and the synthesis of core-modified corroles.
Which keywords best characterize this work?
Key terms include Porphyrins, Smaragdyrins, Corroles, Macrocycles, Fluorescence, and Optoelectronic applications.
What differentiates smaragdyrin from regular porphyrins?
Smaragdyrin is an expanded porphyrinoid containing five heterocyclic rings, which results in a different bridging pattern and unique aromatic properties compared to the standard four-ring porphyrin.
How is phosphorus insertion achieved in these macrocycles?
Phosphorus insertion is typically carried out by refluxing the free-base macrocycle in pyridine with phosphorylating agents like POCl3, PCl3, or PCl5.
What role do core-modified corroles play in current research?
They are studied for their potential in molecular electronics and as DNA-cleaving agents due to their extended π-conjugation and unique cavity size.
- Arbeit zitieren
- Dr. Hemanta Kalita (Autor:in), 2020, Introduction to Core Modified Porphyrinoids. Smaragdyrins, Expanded Porphyrinoids and Corroles, München, GRIN Verlag, https://www.grin.com/document/520517
