Ru(II)Porphyrinate-Based Molecular Nanoreactor for Carbene Insertion Reactions and Quantitative Formation of Rotaxanes by Active-Metal-Template Syntheses
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A Study on Metal Ion Complexation with a Macrocyclic Ligand
t ;fu\'l A STUDY ON ME,TAL IOI{ COMPLEXATION WITH A MACROCYCLIC LIGANI) (A Thermodynamic, Kinetic, and Mechanistic Investigation) A Thesis Presented for the Degree of Master of Science in the UniversitY of Adelaide' by Benu Kumar DeY B.Sc.(Hons.), University of Chittagong M.Sc., UniversitY of Chittagong The Department of Physical and Inorganic Chemistry' TheUniversityofArjelaide,Adclaide,SA500l'Australia October, 199i 11't5 {,r,,*n.lo*J SINIAìTVd ÃW OI Contents Page No. (ii i) Contents (vii) Abstract Acknowledgements Declaration Glossary of Abbreviations for Ligands, Solvents etc. ""'(xii) CHAPTER 1 Literature Review and objectives. 1 1 1.1 Introduction 3 1.2 Thermodynamic S tabilitY t.2.r Macrocyclic Effect 3 5 I.2.1(a) The Enthalpic Origin of the Macrocyclic Effect 6 1.2.1(b) The Entropic Origin of the Macrocyclic Effect .--......"'7 1.2.1(c) The Ring Size of Ligands and the Macrocyctic Effect 8 1.2.1(d) The Kinetic Origin of the Macrocyclic Effect 9 1.3 The Kinetics of Metal Ion Complexation .. ... 1 5 t.4 The Kinetics of Decomplexation of Metal complexes ... .. 1.5 The Mechanistic Terminology of Kinetic Studies """""11 T7 1.5.1 Introduction 18 t.5.2 The Hydrated Metal ion in Aqueous Solution """"" 1.5.3 Typical Reactions of Metal Complexes in Aqueous Solution """""20 r.5.4 General Mechanisms Involved in Substitution Reactions of Metal Complexes in Solution """"'23 lll 1.5.a(a) The Associative Mechanism 24 1.5.4(b) The Dissociative Mechanism z5 1.5.a(c) The Interchange Mechanisms 26 1.6 Objectives of the Present Work 33 CHAPTER 2 ExPerimental -
Insertion Reactions • Oxidative Addition and Substitution Allow Us to Assemble 1E and 2E Ligands on the Metal, Respectively
Insertion Reactions • Oxidative addition and substitution allow us to assemble 1e and 2e ligands on the metal, respectively. • With insertion, and its reverse reaction, elimination, we can now combine and transform these ligands within the coordination sphere, and ultimately expel these transformed ligands to form free organic compounds. • There are two main types of insertion 1) 1,1 insertion in which the metal and the X ligand end up bound to the same (,)(1,1) atom 2) 1,2 insertion in which the metal and the X ligand end up bound to adjacent (1,2) atoms of an L‐type ligand. 1 • The type of insertion observed in any given case depends on the nature of the 2e inserting ligand. • For example: CO gives only 1,1 insertion ethylene gives only 1,2 insertion, in which the M and the X end up on adjacent atoms of what was the 2e X‐type ligand. In general, η1 ligands tend to give 1,1 insertion and η2 ligands give 1,2 insertion • SO2 is the only common ligan d tha t can give bthboth types of itiinsertion; as a ligan d, SO2 can be η1 (S) or η2 (S, O). • In principle, insertion reactions are reversible, but just as we saw for oxidative addition and reductive elimination previously, for many ligands only one of the two possible directions is observed in practice, probably because this direction is strongly favored thermodynamically. 2 •A2e vacant site is generated by 1,1 and 1,2 insertion reactions. • Thissite can be occupidied byanextlternal 2e ligan d and the itiinsertion prodtduct tdtrapped. -
A New Tetradentate Mixed Aza-Thioether Macrocycle and Its Complexation Behavior Towards Fe(II), Ni(II) and Cu(II) Ions
molecules Article A New Tetradentate Mixed Aza-Thioether Macrocycle and Its Complexation Behavior towards Fe(II), Ni(II) and Cu(II) Ions 1,2, 1, 1,2 1 Sze-Wing Ng y, Siu-Chung Chan y, Chi-Fung Yeung , Shek-Man Yiu and Chun-Yuen Wong 1,2,* 1 Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong 2 State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong * Correspondence: [email protected]; Tel.: +852-3442-6831 These authors contributed equally to this work. y Academic Editors: Emilia Furia and Tiziana Marino Received: 5 April 2020; Accepted: 22 April 2020; Published: 27 April 2020 Abstract: A new tetradentate mixed aza-thioether macrocyclic ligand 2,6-dithia[7](2,9)-1,10- phenanthrolinophane ([13]ane(phenN2)S2) was successfully synthesized. Reacting metal precursors [Fe(CH CN) (OTf) ], Ni(ClO ) 6H O, and Cu(ClO ) 6H O with one equivalent of 3 2 2 4 2· 2 4 2· 2 [13]ane(phenN2)S2 afforded [Fe([13]ane(phenN2)S2)(OTf)2](1), [Ni([13]ane(phenN2)S2)](ClO4)2 (2(ClO4)2), and [Cu([13]ane(phenN2)S2)(OH2)](ClO4)2 (3(ClO4)2), respectively. The structures of [13]ane(phenN2)S2 and all of its metal complexes were investigated by X-ray crystallography. The [13]ane(phenN2)S2 was found to behave as a tetradentate ligand via its donor atoms N and S. Keywords: first-row transition metal ion; macrocyclic ligand; coordination complex 1. Introduction Coordination chemistry of first-row transition metal ions has attracted considerable attention for decades due to their high biological relevance. -
Evaluation of the Structure-Activity Relationship of Hemoproteins Through Physicochemical Studies: Hemoglobins As a Prototype of Biosensor
Chapter 14 Evaluation of the Structure-Activity Relationship of Hemoproteins through Physicochemical Studies: Hemoglobins as a Prototype of Biosensor Leonardo M. Moreira, Juliana P. Lyon, Vanessa J. S. V. Santos and Fabio V. Santos Additional information is available at the end of the chapter http://dx.doi.org/10.5772/60576 Abstract In the present work, we have studied a group of prerequisites in terms of “structure- function relationship” of hemoproteins, especially hemoglobins, emphasizing the role of the heme and its chemical environment in the biochemical and physicochemical properties of the biomolecule. We have discussed the ferrous center and its properties as coordination center; the macrocyclic ligands, especially the porphyrins; the esterochemical and electronic properties of the iron-porphyrins (heme groups); and the interaction between heme groups and globins, which is related to several redox and oligomeric properties of hemoprotein systems and its potential applications with respect to novel materials. One of the main uses of hemoglobins in new materials is also discussed, which is its employment as a biosensor. Therefore, we have discussed the development of novel biosensors based on hemoglobins and their physico- chemical properties as well as on the main molecules of biological relevance that have been detected by these biosensors, such as hydrogen peroxide (H2O2), nitric oxide (NO), and cholesterol, among others. Indeed, several important biomolecules and biological processes can be detected and/or evaluated by devices that present hemoglobins as leading chemical components. Different apparatus are covered with respect to distinct characteristics, such as chemical stability, sensitivity, selectivity, reproducibility, durability, optimum conditions of measurements, etc. -
Insertion Reactions of Isocyanides Into the Metal-C(Sp3) Bonds of Ylide Complexes
Journal of Organometallic Chemistry 894 (2019) 61e66 Contents lists available at ScienceDirect Journal of Organometallic Chemistry journal homepage: www.elsevier.com/locate/jorganchem Insertion reactions of isocyanides into the Metal-C(sp3) bonds of ylide complexes ** * María-Teresa Chicote a, , Isabel Saura-Llamas a, , María-Francisca García-Yuste a, Delia Bautista b, Jose Vicente a a Grupo de Química Organometalica, Departamento de Química Inorganica, Facultad de Química, Universidad de Murcia, Spain b ACTI, Universidad de Murcia, E-30100, Murcia, Spain article info abstract Article history: The synthesis of the previously reported complexes [Pd{(C,CeCHCO2R)2PPh2}(m-Cl)]2 (R ¼ Me (1), Et (2)) Received 10 January 2019 has been considerably improved by reacting the phosphonium salts [Ph2P(CH2CO2R)2]Cl with Pd(OAc)2. Received in revised form t Complexes 1 and 2 react with isocyanides R'NC (R’ ¼ C6H4Me2-2,6 (Xy), C6H4I-2 and Bu) to give com- 29 April 2019 plexes of the type [Pd{C,C-{C(CO R) ¼ C(NHR0)}(CHCO R)}PPh }Cl(CNR0)], resulting from the insertion of Accepted 5 May 2019 2 2 2 the unsaturated molecule in one of their PdeC bonds and the hydrogen transfer from the methine CH to Available online 11 May 2019 the iminobenzoyl nitrogen. These are the first insertion reactions observed in the PdeC bond of a P-ylide complex. The crystal structure of the complex [Pd{C,C-{C(CO Me)¼C(NHXy)}(CHCO Me)}PPh }Cl(CNXy)] Keywords: 2 2 2 Palladacycles (3) is reported. © Insertion reactions 2019 Elsevier B.V. All rights reserved. -
Emerging Applications of Porphyrins and Metalloporphyrins in Biomedicine and Diagnostic Magnetic Resonance Imaging
biosensors Review Emerging Applications of Porphyrins and Metalloporphyrins in Biomedicine and Diagnostic Magnetic Resonance Imaging Muhammad Imran 1,*, Muhammad Ramzan 2,*, Ahmad Kaleem Qureshi 1, Muhammad Azhar Khan 2 and Muhammad Tariq 3 1 Department of Chemistry, Baghdad-Ul-Jadeed Campus, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan; [email protected] 2 Department of Physics, Baghdad-Ul-Jadeed Campus, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan; [email protected] 3 Institute of Chemical Sciences, Bahauddin Zakariya University, Multan 60800, Pakistan; [email protected] * Correspondence: [email protected] (M.I.); [email protected] (M.R.) Received: 26 September 2018; Accepted: 17 October 2018; Published: 19 October 2018 Abstract: In recent years, scientific advancements have constantly increased at a significant rate in the field of biomedical science. Keeping this in view, the application of porphyrins and metalloporphyrins in the field of biomedical science is gaining substantial importance. Porphyrins are the most widely studied tetrapyrrole-based compounds because of their important roles in vital biological processes. The cavity of porphyrins containing four pyrrolic nitrogens is well suited for the binding majority of metal ions to form metalloporphyrins. Porphyrins and metalloporphyrins possess peculiar photochemical, photophysical, and photoredox properties which are tunable through structural modifications. Their beneficial photophysical properties, such as the long wavelength of emission and absorption, high singlet oxygen quantum yield, and low in vivo toxicity, have drawn scientists’ interest to discover new dimensions in the biomedical field. Applications of porphyrins and metalloporphyrins have been pursued in the perspective of contrast agents for magnetic resonance imaging (MRI), photodynamic therapy (PDT) of cancer, bio-imaging, and other biomedical applications. -
Recent Advances on Mechanistic Studies on C–H Activation
Open Chem., 2018; 16: 1001–1058 Review Article Open Access Daniel Gallego*, Edwin A. Baquero Recent Advances on Mechanistic Studies on C–H Activation Catalyzed by Base Metals https:// doi.org/10.1515/chem-2018-0102 received March 26, 2018; accepted June 3, 2018. 1Introduction Abstract: During the last ten years, base metals have Application in organic synthesis of transition metal- become very attractive to the organometallic and catalytic catalyzed cross coupling reactions has been positioned community on activation of C-H bonds for their catalytic as one of the most important breakthroughs during the functionalization. In contrast to the statement that new millennia. The seminal works based on Pd–catalysts base metals differ on their mode of action most of the in the 70’s by Heck, Noyori and Suzuki set a new frontier manuscripts mistakenly rely on well-studied mechanisms between homogeneous catalysis and synthetic organic for precious metals while proposing plausible chemistry [1-5]. Late transition metals, mostly the precious mechanisms. Consequently, few literature examples metals, stand as the most versatile catalytic systems for a are found where a thorough mechanistic investigation variety of functionalization reactions demonstrating their have been conducted with strong support either by robustness in several applications in organic synthesis [6- theoretical calculations or experimentation. Therefore, 12]. Owing to the common interest in the catalysts mode we consider of highly scientific interest reviewing the of action by many research groups, nowadays we have a last advances on mechanistic studies on Fe, Co and Mn wide understanding of the mechanistic aspects of precious on C-H functionalization in order to get a deep insight on metal-catalyzed reactions. -
SYNTHESIS and CHARACTERIZATION of MACROCYCLIC COMPLEXES CONTAINING N, O Or S AS BITING CENTERS
SYNTHESIS AND CHARACTERIZATION OF MACROCYCLIC COMPLEXES CONTAINING N, O or S AS BITING CENTERS ABSTRACT THESIS SUBMITTED FOR THE AWARD OF THE DEGREE OF jiOttor of $I|tlQfi(Qpt|P IN CHEMISTRY BY 5HAKIRA KHATOON DEPARTMENT OF CHEMISTRY ALIGARH MUSLIM UNIVERSITY ALIGARH (INDIA) 2007 Jl6stract ABSTRACT The chemistry of" macrocyclic compounds has been an interestuig and fascinatuig area of research activity during last few decades. It lies at the centre of organic and inorganic chemistry and became the basis for development of bioinorganic chemistry. The continued efforts of chemists to proliferate this chemistry are not only due to structural novelties of these compounds but also because of their varied applications. Therefore, the work embodied in the Ph.D thesis aims the synthesis and physico-chemical studies of macrocyclic moieties containing N. O or S as donor atoms and their complexes with firsv \v>^\ transition metal ions Mn(II) Fe(ll) Co(II), Ni(II) and Zn(II) via organic and template procedures showing new structural features. Some of the coniplexes were analyzed for antimicrobial activities. The whole work is divided into five chapters. Chapter 1 deals with the comprehensive account of work cairied out on several classes of macrocycles, general characteristics, different types of synthetic procedures, potential applications and the pioneering work extracted from different reviews, articles and hundreds of research publications reported by various eminent chemists through out the world during past few decades. Chapter 2 gives the detailed account of physico-chemical methods, the instruments and the experimental conditions involved to ascertain the Jl6stract sloichiometry. nature and molecular geometry of the newly synthesized macrocyclic moieties viz; IR. -
MICROREVIEW Catalytic Applications of Pyridine-Containing Macrocyclic Complexes
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by AIR Universita degli studi di Milano MICROREVIEW Catalytic Applications of Pyridine-Containing Macrocyclic Complexes Giorgio Tseberlidis,[a] Daniela Intrieri,[a] and Alessandro Caselli*[a] This work is dedicated to the memory of Flavia Roncalli Abstract: The introduction of a pyridine moiety into the skeleton of a to form stable complexes with a plethora of both transition, polyazamacrocyclic ligand affects both the thermodynamic especially late, and lanthanide metal cations.[9] Deviation of the properties and the coordination kinetics of the resulting metal macrocycle donor atoms from planarity often leads to rather complexes. These features have engendered a great interest of the uncommon oxidation states of the coordinated metal.[10] scientific community in recent years. The field of application of Both the thermodynamic properties and the complexation pyridine-containing macrocyclic ligands ranges from biology to kinetics are affected by the introduction of a pyridine moiety into supramolecular chemistry, encompassing MRI, molecular the skeleton of polyazamacrocycles by increasing the recognitions, materials and catalysis. In this microreview we provide conformational rigidity and tuning the basicity.[11] Pyridine- a perspective on the catalytic applications of metal complexes of containing ligands engendered great interest due to various pyridine-containing macrocycles, including an account of potential field of applications and were successfully -
Abstract(Doctor)
別紙4-1(課程博士(英文)) Date of Submission(month day,year): March 27, 2020 Department Applied Chemistry and Life Student ID Number D 169403 SEIJI IWASA Science Supervisors KAZUTAKA SHIBATOMI Applicant’s name PHAN THI THANH NGA Abstract(Doctor) Catalytic Intramolecular Carbene Transfer Reactions into σ and π Bonds Title of Thesis (σ 及びπ結合への触媒的分子内カルベン移動反応) Approx. 800 words A carbene known as an most active intermediate is complexed with a transition metal, which afford the corresponding metal-carbene complex and catalytically insert into σ and π bonds of organic compound. Even though there are many reports on the carbene transfer process to develop a new approach for the synthesis of medicine and other bioactive compounds, the regio-, stereo- and chemoselective approaches are still limited and remained as a main subject in the filed of synthetic organic chemistry. For these background, I developed an efficient catalytic intramolecular carbene transfer reactions by using originally developed ruthenium catalyst into σ and π bonds and successfully applied for the synthesis of γ-lactam ring fused aromatics (oxindoles), γ-lactone ring fused cyclopropanes, and γ-lactam ring fused seven member rings via Buchner reaction. Although ruthenium complex is a newcomer in the field of catalytic carbene transfer reaction, it has emerged as a useful transition metal for the carbenoid chemistry of diazo compounds, besides copper and rhodium. And recently, we have developed a Ru(II)-Pheox complex, which is efficient for carbene transfer reactions, in particular, asymmetric cyclopropanation, N-H insertion, C-H insertion and Si-H insertion reactions. Therefore, driven by my interests in the catalytic asymmetric carbene transfer reaction and the efficiency displayed by the Ru(II)-Pheox catalyst, I started to explore the asymmetric cyclopropanation, C-H insertion, Buchner reactions of various diazo compounds, which are potentially building blocks and expectant to be applied in pharmaceutical and medicinal fields . -
Review Article Macrocyclic Assembly: a Dive Into the Pecking Order and Applied Aspects of Multitalented Metallomacrocycles
Hindawi Publishing Corporation International Journal of Inorganic Chemistry Volume 2014, Article ID 509151, 30 pages http://dx.doi.org/10.1155/2014/509151 Review Article Macrocyclic Assembly: A Dive into the Pecking Order and Applied Aspects of Multitalented Metallomacrocycles Ashu Chaudhary and Ekta Rawat Department of Chemistry, Kurukshetra University, Kurukshetra, Haryana 136119, India Correspondence should be addressed to Ashu Chaudhary; [email protected] Received 20 August 2014; Accepted 12 November 2014; Published 18 December 2014 Academic Editor: Stephen Ralph Copyright © 2014 A. Chaudhary and E. Rawat. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. To aid in knowledge of macrocyclic complexes and biomedical scientists, we are presenting here a review article with compilation of work done so far along in relation to macrocyclic ligands and their metal complexes. The metal ion chemistry of macrocyclic ligands has now become a major subdivision of coordination chemistry. This overview focuses on developments in design, synthesis, and self-assembly of metal-based architectures and ligands related to macrocyclic chemistry. 1. Introduction and Scope organization which was absent in the linear precursor [6]. Since the birth of macrocycles as early as 1936 [7], the field Macrocycles occupy a unique segment of chemical space. In only began to blossom in early 1960s with the pioneering the past decade, their chemical diversity expanded signifi- work of Thompson and Busch [8]. In such a large subject, cantly, supported by advances in bioinformatics and synthetic this paper can focus only on certain aspects of macrocyclic methodology. -
Carbene Rearrangements: Intramolecular Interaction of a Triple Bond with a Carbene Center
An Abstract OF THE THESIS OF Jose C. Danino for the degree of Doctor of Philosophy in Chemistry presented on _Dcc, Title: Carbene RearrangementE) Intramolecular Interaction of a Triple Bond with aCarbene Center Redacted for Privacy Abstract approved: Dr. Vetere. Freeman The tosylhydrazones of2-heptanone, 4,4-dimethy1-2- heptanone, 6-heptyn-2-one and 4,4-dimethy1-6-heptyn-2- one were synthesizedand decomposed under a varietyof reaction conditions:' drylithium and sodium salt pyrolyses, sodium methoxide thermolysesin diglyme and photolyses of the lithium salt intetrahydrofuran. The saturated ana- logues 2-heptanone tosylhydrazoneand its 4,4-dimethyl isomer afforded the alkenesarising from 6-hydrogeninser- product distribution in the tion. It was determined that differ- dry salt pyrolyses of2-heptanone tosylhydrazone was ent for the lithiumand the sodium salts. However, the product distribution of thedry sodium salt was verysimilar diglyme to product distributionobtained on thermolysis in explained by a with sodium methoxide. This difference was reaction of lithium bromide(present as an impurity inall compound to the lithium salts)with the intermediate diazo afford an organolithiumintermediate that behaves in a some- what different fashionthan the free carbene.The unsaturated analogues were found to produce a cyclic product in addition to the expected acyclic alkenes arising from 3-hydrogen insertion. By comparison of the acyclic alkene distri- bution obtained in the saturated analogues with those in the unsaturated analogues, it was concluded that at leastsome cyclization was occurring via addition of the diazo moiety to the triple bond. It was determined that the organo- lithium intermediateresulting from lithium bromide cat- alyzed decomposition of the diazo compound was incapable of cyclization.