Supramolecular control of stepwise and selective carboxylate ligand substitution in aqua-carboxylato bridged dimetal(II) complexes

1993 ◽  
Vol 115 (26) ◽  
pp. 12617-12618 ◽  
Author(s):  
Karl S. Hagen ◽  
Rene Lachicotte ◽  
Alex Kitaygorodskiy
Keyword(s):  
Ligand Substitution ◽  
Carboxylate Ligand ◽  
Supramolecular Control

Synthesis and Photochemical Properties of Re(I) Tricarbonyl Complexes Bound to Thione and Thiazole-2-ylidene Ligands

2020 ◽  
Author(s):  
Matthew Stout ◽  
Brian Skelton ◽  
Alexandre N. Sobolev ◽  
Paolo Raiteri ◽  
Massimiliano Massi ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Excited States ◽  
Ligand Exchange ◽  
Ligand Substitution ◽  
Bidentate Ligand ◽  
The Other ◽  
Ligand Exchange Reaction ◽  
Multiple Products ◽  
Ligand Charge Transfer ◽  
Photochemical Properties

<p>Three Re(I) tricarbonyl complexes, with general formulation Re(N^L)(CO)<sub>3</sub>X (where N^L is a bidentate ligand containing a pyridine functionalized in the position 2 with a thione or a thiazol-2-ylidene group and X is either chloro or bromo) were synthesized and their reactivity explored in terms of solvent-dependent ligand substitution, both in the ground and excited states. When dissolved in acetonitrile, the complexes bound to the thione ligand underwent ligand exchange with the solvent resulting in the formation of Re(NCMe)<sub>2</sub>(CO)<sub>3</sub>X. The exchange was found to be reversible, and the starting complex was reformed upon removal of the solvent. On the other hand, the complexes appeared inert in dichloromethane or acetone. Conversely, the complex bound to the thiazole-2-ylidene ligand did not display any ligand exchange reaction in the dark, but underwent photoactivated ligand substitution when excited to its lowest metal-to-ligand charge transfer manifold. Photolysis of this complex in acetonitrile generated multiple products, including Re(I) tricarbonyl and dicarbonyl solvato-complexes as well as free thiazole-2-ylidene ligand.</p>

Outer-sphere interaction of (S)-asparagine and (S)-glutamine with [Co(NH3)6]3+ ion and its possible role in ligand substitution

1987 ◽  
Vol 52 (10) ◽  
pp. 2457-2459
Author(s):  
František Jursík
Keyword(s):  
Amino Acids ◽  
Transition Region ◽  
Alkaline Medium ◽  
Optical Activity ◽  
Substitution Reaction ◽  
Outer Sphere ◽  
Ligand Substitution ◽  
Cotton Effect ◽  
Negative Cotton Effect

Optical activity of the achiral cation [Co(NH3)6]3+ is induced both by (S)-AsnONa and (S)-GlnONa, as shown by a negative Cotton effect in the 1A1g → 1T1g transition region. An outer-sphere interaction by three-point attachment of the amides can explain the fact that substitution reaction of [Co(NH3)6]3+ with the mentioned amides in an alkaline medium is unusually slow as compared with other amino acids.

scholarly journals Pyrene Carboxylate Ligand Based Coordination Polymers for Microwave-Assisted Solvent-Free Cyanosilylation of Aldehydes

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 1101
Author(s):  
Anirban Karmakar ◽  
Anup Paul ◽  
Elia Pantanetti Sabatini ◽  
M. Fátima C. Guedes da Silva ◽  
Armando J. L. Pombeiro
Keyword(s):  
Coordination Polymer ◽  
Single Crystal ◽  
Coordination Polymers ◽  
Metal Ion ◽  
Solvent Free ◽  
Lewis Acidity ◽  
Carboxylate Ligand ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Assisted

The new coordination polymers (CPs) [Zn(μ-1κO1:1κO2-L)(H2O)2]n·n(H2O) (1) and [Cd(μ4-1κO1O2:2κN:3,4κO3-L)(H2O)]n·n(H2O) (2) are reported, being prepared by the solvothermal reactions of 5-{(pyren-4-ylmethyl)amino}isophthalic acid (H2L) with Zn(NO3)2.6H2O or Cd(NO3)2.4H2O, respectively. They were synthesized in a basic ethanolic medium or a DMF:H2O mixture, respectively. These compounds were characterized by single-crystal X-ray diffraction, FTIR spectroscopy, thermogravimetric and elemental analysis. The single-crystal X-ray diffraction analysis revealed that compound 1 is a one dimensional linear coordination polymer, whereas 2 presents a two dimensional network. In both compounds, the coordinating ligand (L2−) is twisted due to the rotation of the pyrene ring around the CH2-NH bond. In compound 1, the Zn(II) metal ion has a tetrahedral geometry, whereas, in 2, the dinuclear [Cd2(COO)2] moiety acts as a secondary building unit and the Cd(II) ion possesses a distorted octahedral geometry. Recently, several CPs have been explored for the cyanosilylation reaction under conventional conditions, but microwave-assisted cyanosilylation of aldehydes catalyzed by CPs has not yet been well studied. Thus, we have tested the solvent-free microwave-assisted cyanosilylation reactions of different aldehydes, with trimethylsilyl cyanide, using our synthesized compounds, which behave as highly active heterogeneous catalysts. The coordination polymer 1 is more effective than 2, conceivably due to the higher Lewis acidity of the Zn(II) than the Cd(II) center and to a higher accessibility of the metal centers in the former framework. We have also checked the heterogeneity and recyclability of these coordination polymers, showing that they remain active at least after four recyclings.

Ligand substitution in the osmium carbonyl cluster Os2(CO)8(µ3-SbPh)Os(CO)3(Cl)2: Towards derivatives of the osmostibine metalloligand

2021 ◽  
Vol 942 ◽  
pp. 121817
Author(s):  
Ying-Zhou Li ◽  
Zhi-Rui Yuan ◽  
Rakesh Ganguly ◽  
Yongxin Li ◽  
Deborah Roshni Rajaratnam ◽  
...  
Keyword(s):  
Ligand Substitution ◽  
Carbonyl Cluster ◽  
Osmium Carbonyl ◽  
Derivatives Of

scholarly journals Rhodium(III) Dihalido Complexes: The Effect of Ligand Substitution and Halido Coordination on Increasing Cancer Cell Potency

2021 ◽  
Vol 60 (3) ◽  
pp. 2076-2086
Author(s):  
Rianne M. Lord ◽  
Markus Zegke ◽  
Aida M. Basri ◽  
Christopher M. Pask ◽  
Patrick C. McGowan
Keyword(s):  
Cancer Cell ◽  
Ligand Substitution

scholarly journals Synthesis of a Carborane-substituted Bis(phosphanido) Cobaltate(I), Ligand Substitution, and Unusual P4 Fragmentation

2021 ◽  
Author(s):  
Peter Coburger ◽  
Julia Leitl ◽  
Daniel Scott ◽  
Gabriele Hierlmeier ◽  
Ilya G. Shenderovich ◽  
...  
Keyword(s):  
Oxidative Addition ◽  
Ligand Substitution ◽  
Single Bond ◽  
Heteroleptic Complexes

Oxidative addition of the P‒P single bond of an ortho-carborane-derived 1,2-diphosphetane (1,2-C2(PMes)2B10H10) (Mes = 2,4,6-Me3C6H2) to cobalt(-I) and nickel(0) sources affords the first heteroleptic complexes of a carborane-bridged bis(phosphanido) ligand....

scholarly journals Physical properties, ligand substitution reactions, and biological activity of Co(iii)-Schiff base complexes

2019 ◽  
Vol 48 (18) ◽  
pp. 5987-6002 ◽  
Author(s):  
A. Paden King ◽  
Hendryck A. Gellineau ◽  
Samantha N. MacMillan ◽  
Justin J. Wilson
Keyword(s):  
Biological Activity ◽  
Schiff Base ◽  
Physical Properties ◽  
Ligand Exchange ◽  
Ligand Substitution ◽  
Schiff Base Complexes ◽  
Substitution Reactions ◽  
Anticancer Properties ◽  
Ligand Substitution Reactions

A subset of fluorinated Co(iii) Schiff base complexes was synthesized, and their structural, ligand exchange, and anticancer properties were investigated.

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