3 edition of Structures of macrocyclic nickel (II) complexes found in the catalog.
Structures of macrocyclic nickel (II) complexes
Stuart W. Hawkinson
Written in English
|LC Classifications||Microfilm 23606|
|The Physical Object|
|Pagination||v, 58 l.|
|Number of Pages||58|
|LC Control Number||94895442|
In contrast to several other first-row transition-metal (and non-transition-metal) ions, Ni II is ineffective as a template for the cyclic condensation of 2,6-diacetylpyridine with 4,7-diazadecane-1,diamine and related tetraamines to yield quinquedentate macrocyclic ligands. However, nickel(II) complexes of the membered macrocycle L 3 may be prepared by replacement of . Density functional theory calculations at MX/++G** level were performed to understand the structure and stability of Ni(II) tetraaza macrocyclic dicarbinolamine complex 1. The preferential stability of 1 over the hitherto unknown Ni(II) complex having fully conjugated macrocyclic ligand 2, is examined by analyzing geometric and electronic structures and .
In addition, molecular structures were determined by single crystal X-ray diffraction methods. In 1, the a,e-cis-1,4-chdc ligand bridges nickel(II) macrocycles to form an undulated 1D coordination polymer, whereas the complex 2 shows a dimer in which the e,e-trans-1,4-chdc ligand bridges two nickel(II) cyclams. As part of our research on such compounds, we report herein the synthesis and crystal structure of the coordination polymer built up from the nickel(II) complex of the membered macrocyclic ligand 1,4,8,tetraazacyclotetradecane (cyclam, L), and the dianion of diphenylsilanediylbis(4-benzoic acid) (H 2 A), viz., catena-poly.
Abstract. Three dinuclear terephthalato-bridged nickel(II) complexes [Ni(rac-L)] 2 (μ-TPA)(ClO 4) 2 (1), [Ni(RR-L)] 2 (μ-TPA)(ClO 4) 2 (2), and [Ni(SS-L)] 2 (μ-TPA)(ClO 4) 2 (3) (L = 5,5,7,12,12,hexamethyl-1,4,8,tetraazacyclotetradecane, TPA = terephthalic acid) have been synthesized and -crystal X-ray diffraction analyses revealed that the Ni(II) atoms have . Formation and Dissociation Kinetics and Crystal Structures of Nickel (II)-Macrocyclic Tetrathiaether Complexes in Acetonitrile. Comparison to Nickel (II)-Macrocyclic .
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Abstract. A novel compound catena-(μ-CrO 4-O,O′)[Ni(L 1)Ni(L 2)] 3H 2 O (1) (L 1 = 3,5,10,tetramethyl-1,4,8,tetraazacyclotetradecane and L 2 = 2,5,9,tetramethyl-1,4,8,tetraazacyclotetradecane) has been synthesized for the first time and structurally characterized.
1 crystallizes in the triclinic space group Pī with a = (1), b = (1), c = (3) Å, α Cited by: 4. Synthesis and Characterization of a Novel Heteroditopic Macrocyclic System – Monometallic Nickel(II) and Uranyl Complexes and Their Corresponding Heterobimetallic Carbonylrhodium(I) Complexes.
European Journal of Inorganic Chemistry(5), Cited by: The structure of 1 consists of monomeric cations of the formula [Ni (L +H) (CH 3 CN) 2] 3+ and perchlorate ions. The nickel (II) ion is six-coordinate with bonds to the four nitrogen atoms of the macrocycle and two nitrogen atoms of the axial acetonitrile by: Oxidation of octaaza macrocyclic complexes of nickel(II): structures containing the -diazonato chelate ring.
Inorganic Chemistry17 (12), DOI: /icaCited by: About this book. The synthesis of macrocycles is an art in itself. Template-controlled synthesis provides elegant access to fascinating macrocyclic structures. Polyazamacrocycles, crown ethers, cryptands, rotaxanes, knots -- the range of macrocyclic compounds is as broad as their potential application as molecular switches, in ion exchange.
macrocyclic ligand. One of the earliest examples of a templated reaction involves the reaction of ethylenediamine (en), H 2 NCH 2 CH 2 NH 2, with acetone in the presence of nickel(II) ion.
1 The products of this reaction A and B are remarkable in their stability under conditions that would destroy many other. This chapter discusses the macrocyclic chemistry of nickel, and syntheses, properties, structures, and reactions of Ni (II), Ni (III), and Ni (I) macrocyclic complexes.
The Ni (II) complexes of aza-type macrocylic ligands are prepared by complexation reaction between presynthesized macrocyclic ligands and the metal ion in solution or by metal-ion-directed. In 1, the nickel(II) ion is four-coordinated with four nitrogen atoms from the macrocycle and forms a square-planar coordination geometry.
The crystal structure has been published by two groups, and show a hexameric structure with a molecular weight of approximat Daltons, where each monomeric unit contains what has been described as a “nickel-hook.”. Highlight A new series of nickel(II) tetraaza macrocyclic complexes have been synthesized as possible functional models for NiSOD enzyme.
The superoxide dismutase mimetic activities of the complexes indicated that they are potent NiSOD mimics. The DNAbinding properties of the representative complexes 2 and 4 have been investigated.
Macrocycle: Cyclic macromolecule or a macromolecular cyclic portion of a macromolecule. Note 1: A cyclic macromolecule has no end-groups but may nevertheless be regarded as a chain. Note 2: In the literature, the term macrocycle is sometimes used for molecules of low relative molecular mass that would not be considered macromolecules.
The synthesis, characterization, and reactivity of the monoaryl–Ni(II) compound 2 and the diaryl–Ni(II) compound 4 formed through the direct electrophilic metalation of two macrocyclic azacalix[m]arene[n]pyridine ligands are described.
Compound 4 was much more stable in protic solvents and acids than the monoaryl–Ni(II) compound 2. Moreover, 2 can. New hexadentate macrocyclic ligand and their copper(II) and nickel(II) complexes: Spectral, magnetic, electrochemical, thermal, molecular modeling and antimicrobial studies.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy94, Synthesis and Crystal Structures of Dinuclear Palladium and Mononuclear Nickel Complexes of Macrocyclic N8S4 Ligands. Zeitschrift für anorganische und allgemeine Chemie(5), DOI: /zaac Huu-Anh.
In this article we reported the coordination behavior and characterization of macrocyclic ligands with their nickel(II) metal ion. We have taken in to account the factors which affect the structure of complexes and their geometries and determining the structures based around the theory of magnetic moments and other spectral studies.
A comparison of the molecular structure of related nickel(II) complexes of the open-chain and membered macrocyclic oxamide-derived ligands NiL 1 4H 2 O and NiL 2 3H 2 O revealed that the formation of an additional 6-membered chelate ring in the complex results in rather small changes in the molecular structure of the ligands and the bite angles around the metal ion.
A new type of hetero- and homo-polynuclear complexes of copper(ii) and nickel(ii) containing 1,2,3-triazole groups in polymethylene chains have been synthesized and characterized using NMR and electrochemical methods.
The triazole link facilitates the synthesis of hetero-dinuclear macrocyclic complexes. Intr. The crystal structure of the Ni macrocycle salt, (5,7,7,12,12,hexamethyl-1,4,8,tetraazacyclotetradecane)nickel(II) bis(perchlorate) hemihydrate, [Ni(C 16 H 36 N 4)] 2 (ClO 4) 4 H 2 O, contains two different diasteriomeric macrocyclic cations in the asymmetric unit, one with two NH protons on each side of the cation (Ia), and the other with all four NH protons on the.
The X-ray crystal structure of 1 indicates that one en coordinates a nickel(II) macrocyclic complex to form a folded macrocyclic complex, which ends up with a.
The chapters in this book discuss various aspects of macrocyclic chemistry, and while these chapters as a whole constitute an in-depth survey of the state-of the-art of the field, each chapter is written as a complete unit. with 2-Imino(or 2-amido)-benzaldimine Chelate Rings.- Discussion of Structures.- Listing of Structures of.
A couple of enantiomers of novel chiral macrocyclic imines based on R/S-camphor were asymmetrically synthesized. Through the chiral macrocyclic ligands, enantiomers of nickel(ii) coordination compounds were obtained. The chirality of the ligand was transferred to the nickel atom upon coordination, leading to predet.Book Editor(s): Fred Basolo Philip Lightfoot, a L.
de Alwis, The preparation, chemistry and crystal structure of the nickel(II) complex of N-hydroxyethylazacyclam [3-(2 Conformational characterization of square planar nickel(II) tetraaza macrocyclic complexes by proton NMR. Crystal structure of [Ni(13aneN4)]ZnCl4, Inorganica.The macrocyclic ligand (L) and its nickel(II) complex were prepared according to the literature method24,25 and separated as the racemic form of rac-L.
The nickel(II) complex [Ni(rac-L)](ClO 4) 2 was prepared according to the previously reported methods All other chemicals were commercially sourced and used without further puriﬁcation.