scholarly journals Mono- and dimeric complexes of an asymmetric heterotopic P,CNHC,pyr ligand

2016 ◽  
Vol 45 (34) ◽  
pp. 13347-13360 ◽  
Author(s):  
Mathilde Bouché ◽  
Michael Mordan ◽  
Benson M. Kariuki ◽  
Simon J. Coles ◽  
Jeppe Christensen ◽  
...  
Keyword(s):  
Tridentate Ligand ◽  
Dimeric Complexes

An asymmetric tridentate ligand with three different donors coordinates to Ag(i) and Au(i) to give discreet ligand-bridged dimers or κ1-C species whilst full κ3-binding occurs with Ni(ii), Pt(ii) and Rh(i).

Design and synthesis of a tridentate ligand for asymmetric bifunctional catalysis

2007 ◽  
Vol 48 (31) ◽  
pp. 5561-5564 ◽  
Author(s):  
Virginie Casarotto ◽  
Zhongtao Li ◽  
Julie Boucau ◽  
Yun-Ming Lin
Keyword(s):  
Tridentate Ligand ◽  
Bifunctional Catalysis ◽  
Design And Synthesis

New chiral tridentate ligands for asymmetric catalysis

2006 ◽  
Vol 78 (2) ◽  
pp. 311-320 ◽  
Author(s):  
Kevin Murtagh ◽  
Brian A. Sweetman ◽  
Patrick J. Guiry
Keyword(s):  
Asymmetric Catalysis ◽  
High Performance ◽  
Aromatic Aldehydes ◽  
Asymmetric Induction ◽  
Tridentate Ligand ◽  
Coupling Reactions ◽  
Tridentate Ligands ◽  
Molecular Complexation ◽  
Cross Coupling Reactions ◽  
Moderate Yield

The synthesis of new tridentate, isoquinoline-derived ligands, involving successive Suzuki cross-coupling reactions, is described. We were able to resolve 1-[3-(2-hydroxy-phenyl)-isoquinolin-1-yl]-naphthalen-2-ol via molecular complexation with N-benzylcinchonidinium chloride, whereas 1,3-bis(2-hydroxy-naphthalen-1-yl)-isoquinoline was resolved by chromatographic separation of its epimeric camphorsulfonates. Their barrier to rotation about the central biaryl axis was evaluated via racemization studies. Application of enantiopure 1,3-bis(2-hydroxynaphthalen-1-yl)-isoquinoline in the addition of diethylzinc to aldehydes proceeded in moderate yield but without asymmetric induction. A new tridentate ligand, 4-tert-butyl-2-chloro-6-[1-(2-hydroxymethyl-naphthalen-1-yl)-isoquinolin-3-yl]-phenol, was prepared in good yield and resolved by semipreparative high-performance liquid chromatography (HPLC). Its application in the addition of diethylzinc to a range of aromatic aldehydes proceeded in near perfect enantioselectivities at low ligand loadings of 1 mol %.

Structural diversity of salts of terpyridine derivatives with europium(III) located in both, cation and anion, in comparison to molecular complexes

2020 ◽  
Vol 235 (8-9) ◽  
pp. 353-363
Author(s):  
Alexander E. Sedykh ◽  
Robin Bissert ◽  
Dirk G. Kurth ◽  
Klaus Müller-Buschbaum
Keyword(s):  
Thermal Properties ◽  
Crystal Packing ◽  
Side Reaction ◽  
Molecular Complexes ◽  
Structural Diversity ◽  
Organic Ligands ◽  
Ionic Complexes ◽  
Structural Variability ◽  
Dimeric Complexes ◽  
The Common

AbstractThree salts of the common composition [EuCl2(X-tpy)2][EuCl4(X-tpy)]·nMeCN were obtained from EuCl3·6H2O and the respective organic ligands (X-tpy = 4′-phenyl-2,2′:6′,2″-terpyridine ptpy, 4′-(pyridin-4-yl)-2,2′:6′,2″-terpyridine 4-pytpy, and 4′-(pyridin-3-yl)-2,2′:6′,2″-terpyridine 3-pytpy). These ionic complexes are examples of salts, in which both cation and anion contain Eu3+ with the same organic ligands and chlorine atoms coordinated. As side reaction, acetonitrile transforms into acetamide resulting in the crystallization of the complex [EuCl3(ptpy)(acetamide)] (4). Salts [EuCl2(ptpy)2][EuCl4(ptpy)]·2.34MeCN (1), [EuCl2(4-pytpy)2][EuCl4(4-pytpy)]·0.11MeCN (2), and [EuCl2(3-pytpy)2][EuCl4(3-pytpy)]·MeCN (3) crystallize in different structures (varying in space group and crystal packing) due to variation of the rear atom of the ligand to a coordinative site. Additionally, we show and compare structural variability through the dimeric complexes [Eu2Cl6(ptpy)2(N,N′-spacer)]·N,N′-spacer (5, 6, 7) obtained from [EuCl3(ptpy)(py)] by exchanging the end-on ligand pyridine with several bipyridines (4,4′-bipyridine bipy, 1,2-bis(4-pyridyl)ethane bpa, and 1,2-bis(2-pyridyl)ethylene bpe). In addition, photophysical (photoluminescence) and thermal properties are presented.

Komplexe des 1-Thia-4,7-diazacyclononans (L) mit Blei(II), Indium(III), Thallium(I) und (III) Kristallstruktur von [LPb][PbBr4] / Complexes of 1-Thia-4,7-diazacyclononane (L) with Lead(II), Indium(III), Thallium(I) and (III) Crystal Structure of [LPb][PbBr4]

1988 ◽  
Vol 43 (5) ◽  
pp. 567-570 ◽  
Author(s):  
Peter Hoffmann ◽  
Franz-Josef Hermes ◽  
Rainer Mattes
Keyword(s):  
Crystal Structure ◽  
Lone Pair ◽  
Tridentate Ligand ◽  
Crystal Data ◽  
Orthorhombic Space Group ◽  
Space Group

Abstract The reaction of 1-thia-4,7-diazacyclononane (C6H14N2S = L) with salts containing Tl(I) and (III), In(III) and Pb(II) ions yields 1:1 complexes, which can be crystallized as halide or Perchlorate salts. The structure of [LPb][PbBr4] (5) has been determined: Crystal data: orthorhombic, space group P212121, a = 853.2(6), b = 1000.1(4), c = 1860(1) pm, Z = 4. Pb2+ in the [LPb]2+ cation is seven-coordinated by the tridentate ligand and a square of four Br- ions. The Pb-S distance, 286.0(5) pm, is rather short, the lone pair stereochemically activ. The PbBr4- ions are polymeric with octahedrally coordinated lead(II) atoms.

scholarly journals Unsymmetrical Schiff Base Functionalized as Monobasic Tridentate Ligand on Complexation with Some Transition Metal Ions

2012 ◽  
Vol 9 (2) ◽  
pp. 532-544
Author(s):  
Bibhesh K. Singh ◽  
Narendar Bhojak ◽  
Anant Prakash
Keyword(s):  
Schiff Base ◽  
Transition Metal Ions ◽  
Tridentate Ligand ◽  
Planar Geometry ◽  
Physico Chemical ◽  
Square Planar ◽  
Unsymmetrical Schiff Base ◽  
Mm2 Calculations ◽  
Microbial Potential

Cu(II), Co(II), Ni(II) and Mn(II) complexes of Schiff base derived from 2-aminophenol and pyrrole-2- carbaldehyde have been prepared. The complexes are formed by coordination of N and O atoms of the ligand. Their structures were characterized by physico-chemical and spectroscopic methods. Molecular structure of the complexes has been optimized by MM2 calculations and suggests a tetrahedral/ square planar geometry. The bio-efficacy of the ligand and their complexes has been examined against the growth of bacteriain vitroto evaluate their anti-microbial potential.

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