A mercury-199 NMR study of the complexation of methylmercury with thia-crown ethers. The absence of a macrocyclic ligand effect

1986 ◽  
Vol 51 (9) ◽  
pp. 1609-1610 ◽  
Author(s):  
Robert D. Bach ◽  
Harsha B. Vardhan
Keyword(s):  
Crown Ethers ◽  
Macrocyclic Ligand ◽  
Ligand Effect ◽  
Nmr Study

scholarly journals 19F NMR study of ligand dynamics in carboxylate-bridged diiron(ii) complexes supported by a macrocyclic ligand

2015 ◽  
Vol 44 (41) ◽  
pp. 18111-18121 ◽  
Author(s):  
Mikael A. Minier ◽  
Stephen J. Lippard
Keyword(s):  
Nmr Spectroscopy ◽  
Macrocyclic Ligand ◽  
19F Nmr ◽  
Intramolecular Dynamics ◽  
Nmr Study

Using VT 19F NMR spectroscopy, we explored the intramolecular dynamics of a family of carboxylate-bridged diiron(ii) complexes, [Fe2(X2PIM)(ArRCCO2)2]. The data are consistent with these complexes undergoing μ–η1:η2 to μ–η1:η1 carboxylate shifts.

Structural changes in the complexation of benzo-crown ethers—NOESY and variable-temperature13C NMR study

1991 ◽  
Vol 29 (7) ◽  
pp. 656-666 ◽  
Author(s):  
S. V. Santhana Mariappan ◽  
L. Gomathi ◽  
S. Subramanian
Keyword(s):  
Crown Ethers ◽  
Structural Changes ◽  
Nmr Study

Interlayer adsorption of macrocyclic compounds (crown-ethers and cryptands) in 2:1 phyllosilicates: I. Isotherms and kinetics

Clay Minerals ◽  
1986 ◽  
Vol 21 (1) ◽  
pp. 1-7 ◽  
Author(s):  
B. Casal ◽  
E. Ruiz-Hitzky
Keyword(s):  
Crown Ethers ◽  
Adsorption Isotherms ◽  
Macrocyclic Ligand ◽  
Macrocyclic Compounds ◽  
Interlayer Cation ◽  
Arrhenius Plots ◽  
Monolayer Capacity ◽  
Diffusion Controlled ◽  
Different Temperatures ◽  
Cation Complexes

AbstractThe intercalation process of crown-ethers and cryptands into Ba2+- and Na+-montmorillonites leads to H-type adsorption isotherms according to the Giles et al. classification. The experimental monolayer capacity shows that 1:1 or 2:1 macrocyclic ligand/interlayer cation complexes can be produced. Kinetic experiments at different temperatures indicate that the intercalation is diffusion-controlled. The activation energies deduced from Arrhenius plots are 25–38 kJ mol−1.

NMR Study of Complexation of Crown Ethers with [60]- and [70]Fullerenes

2003 ◽  
Vol 107 (18) ◽  
pp. 4213-4217 ◽  
Author(s):  
Sumanta Bhattacharya ◽  
Anubha Sharma ◽  
Sandip K. Nayak ◽  
Subrata Chattopadhyay ◽  
Asok K. Mukherjee
Keyword(s):  
Crown Ethers ◽  
Nmr Study

scholarly journals CONDUCTOMETRIC STUDY OF LIGAND STRUCTURE INFLUENCE ON THE Pb(II) COMPLEXATION WITH CROWN ETHERS

STED JOURNAL ◽  
2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Edita Bjelić ◽  
Mersiha Suljkanović ◽  
Jasmin Suljagić ◽  
Azra Kovačević
Keyword(s):  
Crown Ethers ◽  
Metal Ion ◽  
Macrocyclic Ligand ◽  
Complexation Reaction ◽  
Stoichiometric Ratio ◽  
Ligand Structure ◽  
Conductance Data ◽  
Conductometric Study ◽  
The Stability ◽  
Triton X

The conductometric study of ligand structure influence on the Pb(II) complexation with crown ethers in different solvents has been investigated. In this paper, the complexation reaction of macrocyclic ligand, 18-crown-6 (18C6), dibenzo-18-crown-6 (DB18C6), and Pb(II) cation was studied in different solvents: dichloromethane (DCM) and 1,2- dichloroethane (1,2-DCE). The effects of surfactant structure (Triton X-100 and Triton X-45) on the conductivity of the Pb(II) complex with 18-crown-6 and dibenzo-18-crown-6 ether have been investigated. The conductance data showed that the stoichiometry of the complexes in most cases is 1:1(ML). It is also demonstrated that the influence of crown ethers is deeply affected by the organic solvent used. In the solvents studied, the stability of the resulting complexes showed higher stability in dichloromethane comparing with 1,2- dichloroethane. Macrocyclic ligand 18-crown-6 showed more suitable for complexation of Pb(II) ions compared to dibenzo-18-crown-6. Adding a surfactant affected the higher absolute values of the conductivity of systems, but not the change in the stoichiometric ratio between a metal ion and macrocyclic ligand.

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