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2 edition of Seven-co-ordination in metal complexes of pentadentate macrocyclic ligands. found in the catalog.

Seven-co-ordination in metal complexes of pentadentate macrocyclic ligands.

Paul Derek Alexander McIlroy

Seven-co-ordination in metal complexes of pentadentate macrocyclic ligands.

by Paul Derek Alexander McIlroy

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Published .
Written in English


Edition Notes

Thesis (Ph. D.)--The Queen"s University of Belfast, 1976.

The Physical Object
Pagination1 v
ID Numbers
Open LibraryOL21221502M

We have investigated the isomeric distribution and rearrangement of complexes of the type [CoXLn](2+,3+) (where X = Cl-, OH-, H2O, and L-n represents a pentadentate , , and membered tetraaza or diaza-dithia (N-4 or N2S2) macrocycle bearing a pendant primary amine). The preparative procedures for chloro complexes produced almost exclusively kinetically preferred cis . Seven-coordinate manganese(II) complexes [Mn(L)(HO) ], where L represents an equatorial pentadentate macrocyclic ligand with five nitrogen donor atoms, were studied with regard to their acid-base properties, water-exchange rate constants, and corresponding activation parameters (ΔH, .

  These complexes are more stable than complexes formed from monodentate ligands. The enhanced stability is known as the chelate effect. Macrocyclic ligands are the chelating ligands that can form a large ring and surround the central atom or ion partially or fully and bond to it. The central atom or ion resides at the centre of the large ring. Stability of Transition Metal Complexes (continued, see H&S 3rd Ed.) The ‘chelate effect’: observation that chelating ligands form more stable complexes (higher β values) than do an equivalent number of related monodentate ligands Eg. Ion L Complex log β Cu2+ NH 3 [Cu(NH3)4] 2+ Cu2+ en [Cu(en) 2] 2+ Ni2+ NH 3 [Ni(NH3)6.

Denticity refers to the number of donor groups in a single ligand that bind to a central atom in a coordination complex. In many cases, only one atom in the ligand binds to the metal, so the denticity equals one, and the ligand is said to be monodentate (sometimes called unidentate).Ligands with more than one bonded atom are called polydentate or multidentate. A large number of complexes of pentadentate ligands have been reported in the literature, however, relatively few of these complexes have acyclic pentadentate (N 5) Schiff base ligands co-ordinated to the metal ion [1,2,3,4,5].We have synthesised a variety of tripodal tetraamine ligands and several series of their related acyclic and macrocyclic (N 5) Schiff base complexes, using a template.


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Seven-co-ordination in metal complexes of pentadentate macrocyclic ligands by Paul Derek Alexander McIlroy Download PDF EPUB FB2

Seven-co-ordination in metal complexes of quinquedentate macrocyclic ligands. Part 7. Synthesis and properties of some manganese(II), iron(III), iron(II), zinc(II), and cadmium(II) complexes of an N 3 O 2 macrocycle and the crystal and molecular structure of {2,dimethyl-6,9-dioxa-3,12,triazabicyclo[]octadeca-1(18),2,12,14,pentaene}di-isothiocyanatomanganese(II).

Seven-co-ordination in metal complexes of quinquedentate macrocyclic ligands. Part 5. Synthesis and properties of pentagonal-bipyramidal and pentagonal-pyramidal manganese(II) complexes and crystal and molecular structure of {2,dimethyl-3,7,10,14,penta-azabicyclo[]eicosa-1(20),2,14,16,pentaene}bis(isothiocyanato)manganese(II).

2. Pentadentate Schiff base ligands and their metal complexes N,O-containing pentadentate Schiff base complexes. For this family of N,O-containing pentadentate ligands, the two most common types are by far those containing N 2 O 3 and N 3 O 2 donor sets, even though N 5 donor set is sometimes by: Isomeric Distribution and Catalyzed Isomerization of Cobalt(III) Complexes with Pentadentate Macrocyclic Ligands.

Importance of Hydrogen Bonding. Inorganic Chemistry45 (21). Synthesis and characterization of transition metal complexes containing a pentadentate macrocyclic ligand.

Inorganic Chemistry14 (5), DOI: /ica James J. Christensen, Delbert J. Eatough, and Reed M. Izatt. The Synthesis and Ion Bindings of Synthetic Multidentate Macrocyclic by: Metal complexes of the new derivatized macrocyclic ligands Lhaving general formula 2O (M = Mn, Fe, Co, Ni, Cu, Zn) are readily prepared.

Discover the. Tetradentate Ligands -- 4. Pentadentate Ligands -- 5. Sexadentate Ligands -- 6. Binucleating Ligands -- 7. Clathrochelates -- 8. Conclusions -- References -- 3. Thermodynamics and Kinetics of Cation-Macrocycle Interaction -- 1.

Introduction -- 2. Parameters Determining Cation Selectivity and Complex Stability -- 3. Macrocyclic Effect -- 4. Esterification reactions are facile, and the reaction of the hydroxyethyl-substituted macrocycle with thionyl chloride yields a chloroethyl derivative.

Metal complexes of the new derivatized macrocyclic ligands L having general formula ML X 2 O (M = Mn, Fe, Co, Ni, Cu, Zn) are readily prepared.

Also, macrocyclic ligands of appropriate size form more stable complexes than the chelating ligands. This structure o chlorophyll is shown in Fig. Fig. Structure of Chlorophyll. A Chemical Mystery “Same metal, same ligands but different number of ions when dissolved”.6, 12, S.

LeovacVukadin M., CešljevićValerija I., Transition Metal Chemistry, Trans Met Chem, X, Transition metal complexes with thiosemicarbazide-based ligands, Part II, Synthesis and characterisation of nickel(II), cobalt(II), manganese(II) and zinc(II) complexes with the pentadentate ligand, 2,6-diacetylpyridine bis(S.

Macrocyclic ligands are defined as cyclic molecules generallyconsistingoforganicframesintowhichheteroatoms, capable of binding to substrates, have been interspersed. macrocyclic form. The common transition metals used in macrocyclic catalysts are Fe, Co, Ni, and Cu, and the macrocyclic ligands include chelating atoms N 4, N 2 O 2, N 2 S 2, O 4, and S 4.

This can be further explained by considering the interaction between small molecules and a transition metal. Electron transition occurs first from.

Penta- hexa- and heptadentate Schiff base ligands with donor sets combining N, O, S or P donors. • Structural aspects of their transition metal, main group, lanthanide and actinide complexes.

• Linear and macrocyclic pentadentate Schiff bases and their metal complexes. • Discussion of structures and physico-chemical properties of SB. Chemists have been aware of the existence of coordination compounds con­ taining organic macrocyclic ligands since the first part of this century ; however, only during the past few years have they expanded research into the chemistry of these compounds.

The expansion was initiated in the. Chemists have been aware of the existence of coordination compounds con taining organic macrocyclic ligands since the first part of this century ; however, only during the past few years have they expanded research into the chemistry of these compounds.

The expansion was initiated in the early s by the synthesis and characterization of compounds containing some new macrocyclic ligands.

The. Metal Complexes with Macrocyclic Ligands. The binuclear species [Cu 2 (LH −1)] 3+ specifically reacts with an azide ion to give a ternary complex [Cu 2 (LH −1)(N 3)] 2+, the stability and structure of which were determined spectrophotometrically and by X‐ray diffraction, respectively.

Metal complexes of the new derivatized macrocyclic ligands Lhaving general formula 2O (M = Mn, Fe, Co, Ni, Cu, Zn) are readily prepared. View full-text Article. An archetypical pentadentate ligand is the polypyridyl PY5H 2 and its derivatives PY5R 2 (R = Me, OH, OMe; Figure 1).

These ligands typically bind metal ions with one axial and four equatorial pyridine donors,1,2 although other coordination modes are known.1,3,4 The structural and elec-tronic flexibility of the PY5R 2 family allows these ligands to. Metal Complexes of Pentadentate Macrocyclic Ligands Containing Oxygen and Nitrogen as Donor Atoms, M.

Fátima Cabral, Rita Delgado, Helv. Chim. Acta,77, Electron Spin Resonance Studies and Crystal Structures of Copper(II) Complexes of someand Membered Oxatriaza Macrocycles, Vitor Felix, Rita Delgado, M. Teresa S. Macrocyclic ligands are considerably attractive in the quest for new chemistry, because they offer a wide variety of donor atoms, ionic charges, coordination numbers and geometry of the resultant complexes [1–5].The understanding of the metal ion chemistry of macrocyclic ligands has important implications for a range of chemical and biochemical applications [6,7].

I am ligand: A pentadentate bispidine ligand with two tertiary amine and three pyridine donors stabilizes the uncommon intermediate‐spin electronic configuration of Co III (S =1; see picture: C gray, N blue, O red, Co violet).

Dissociation of the monodentate coligand yields a catalytically active pentacoordinate complex.Introduction. A large number of complexes of pentadentate ligands have been reported in the literature, however, relatively few of these complexes have acyclic pentadentate (N 5) Schiff base ligands co-ordinated to the metal ion [1,2,3,4,5].We have synthesised a variety of tripodal tetraamine ligands and several series of their related acyclic and macrocyclic (N 5) Schiff base complexes.

We have investigated the isomeric distribution and rearrangement of complexes of the type [CoXLn]2+,3+ (where X = Cl- OH- H2O, and Ln represents a pentadentate, and membered tetraaza or diaza−dithia (N4 or N2S2) macrocycle bearing a pendant primary amine).

The preparative procedures for chloro complexes produced almost exclusively kinetically preferred cis isomers .