Successive Syntheses and Magnetic Research of Homodinuclear Lanthanide Macrocyclic Complexes

2021 ◽  
Author(s):  
Xiang Li ◽  
Yu-Han Liu ◽  
Guangzhou Zhu ◽  
Feng-Lei Yang ◽  
Feng Gao
Keyword(s):  
Macrocyclic Ligand ◽  
Macrocyclic Complexes

A series of homodinuclear β-diketone lanthanide(III) complexes, formulated as [(acac)4Ln2(L1)] (Ln3+ = Dy3+ (1), Tb3+ (2), and Gd3+ (3), respectively) were first synthesized based on a closed-macrocyclic ligand (H2L1) derived...

Covalent lanthanide(iii) macrocyclic complexes: the bonding nature and optical properties of a promising single antenna molecule

2014 ◽  
Vol 16 (47) ◽  
pp. 25978-25988 ◽  
Author(s):  
Walter A. Rabanal-León ◽  
Dayán Páez-Hernández ◽  
Ramiro Arratia-Pérez
Keyword(s):  
Optical Properties ◽  
Electronic Structure ◽  
Coordination Compounds ◽  
Macrocyclic Ligand ◽  
Macrocyclic Complexes ◽  
Lanthanide Ions ◽  
Single Antenna ◽  
Trivalent Lanthanide

The present work is focused on the elucidation of the electronic structure, bonding and optical properties of a series of coordination compounds of type [LnIIIHAM]3+, where “LnIII” are the trivalent lanthanide ions: La3+, Ce3+, Eu3+ and Lu3+, while “HAM” is the neutral six-nitrogen macrocyclic ligand [C22N6H26].

scholarly journals New Copper and Oxomolybdate Robson-Type Polynuclear Macrocyclic Complexes: Structure, Spectroscopy, and Electrochemical Properties

2015 ◽  
Vol 2015 ◽  
pp. 1-9
Author(s):  
Marcelo Carpes Nunes ◽  
Marcos Antonio Ribeiro ◽  
Fábio Souza Nunes
Keyword(s):  
Electrochemical Properties ◽  
Macrocyclic Ligand ◽  
Metal Cations ◽  
Redox Properties ◽  
Macrocyclic Complexes ◽  
Molecular Structures ◽  
Polynuclear Complexes ◽  
Unique Mode ◽  
Macrocycle Ligand ◽  
Mode Of Coordination

The polynuclear complexes [Mo3O8(tidf)]·dmso·2H2O (1) and [{Cu2(tidf)}2(μ-Mo8O24)] (2) (tidf2−is a symmetrical tetraiminodiphenolate Robson-type macrocyclic ligand) were prepared from equimolar combinations of [Mg2(tidf)](NO3)2·4H2O, [MoO2Cl2(dmso)2] (for1) and complex1and Cu(ClO4)2·4H2O (for2) in acetonitrile. Molecular structures of both complexes were determined and showed atypical modes of coordination. A significant observation was the remarkable flexibility of the macrocycle ligand that effectively accommodated the steric demands of metal cations and the packing forces and showed a unique mode of coordination. Spectroscopic (UV-vis and FTIR) and redox properties are discussed.

scholarly journals Macrocyclic complexes: Synthesis and characterization

2010 ◽  
Vol 75 (4) ◽  
pp. 475-482 ◽  
Author(s):  
Dharmpal Singh ◽  
Krishan Kumar
Keyword(s):  
Magnetic Measurements ◽  
Macrocyclic Ligand ◽  
Macrocyclic Complexes ◽  
Metal Salts ◽  
Trivalent Metal ◽  
Pyramidal Geometry ◽  
Elemental Analyses ◽  
Square Pyramidal Geometry ◽  
In Vitro Antifungal Activity

A novel series of complexes of the type [M(C28H24N4)X]X2, where M = Cr(III), Fe(III) or Mn(III), X = Cl?, NO3 ?, CH3COO? and (C28H24N4) corresponds to the tetradentate macrocyclic ligand, were synthesized in methanolic media by the template condensation of 1,8-diaminonaphthalene and 2,3- butanedione (diacetyl) in the presence of trivalent metal salts. The complexes were characterized by elemental analyses, conductance and magnetic measurements, and UV/Vis, NMR and IR spectroscopy. Based on these studies, a five-coordinate square pyramidal geometry for all the prepared complexes is proposed. All the synthesized macrocyclic complexes were tested for their in vitro antifungal activity against some fungal strains viz. Aspergillus niger and A. fumigatus. The results obtained were compared with the standard antifungal drug fluconazole.

Azaoxa Macrocyclic and Acyclic Complexesof Lanthanides

1998 ◽  
Vol 63 (3) ◽  
pp. 363-370 ◽  
Author(s):  
Violetta Patroniak-Krzyminiewska ◽  
Wanda Radecka-Paryzek
Keyword(s):  
Schiff Base ◽  
Spectral Data ◽  
Macrocyclic Ligand ◽  
Lanthanide Ions ◽  
H Nmr ◽  
Elemental Analyses ◽  
Acyclic Complexes ◽  
Schiff Base Cyclocondensation

The template reactions of 2,6-diacetylpyridine with 3,6-dioxaoctane-1,8-diamine in the presence of dysprosium(III), thulium(III) and lutetium(III) chlorides and erbium(III) perchlorate produce the complexes of 15-membered macrocyclic ligand with an N3O2 set of donor atoms as a result of the [1+1] Schiff base cyclocondensation. In contrast, analogous reactions involving the lighter lanthanide ions (lanthanum(III), samarium(III) and europium(III)) yield the acyclic complexes with terminal acetylpyridyl groupings as products of the partial [2+1] condensation. The complexes were characterized by spectral data (IR, UV-VIS, 1H NMR, MS), and thermogravimetric and elemental analyses.

Anion effect on alkali ion-crown complex formation in a moderately concentrated solutions: A sensitive probe of hidden interionic interactions operating in dissociating protic solvents

1990 ◽  
Vol 55 (5) ◽  
pp. 1149-1161
Author(s):  
Jiří Závada ◽  
Václav Pechanec ◽  
Oldřich Kocián
Keyword(s):  
Hydrogen Bond ◽  
Complex Formation ◽  
Charge Density ◽  
Macrocyclic Ligand ◽  
Simple Explanation ◽  
Anion Effect ◽  
Protic Solvents ◽  
The Individual ◽  
Alkali Salts ◽  
Alkali Ion

A powerful anion effect destabilizing alkali ion-crown complex formation has been found to operate in moderately concentrated protic (H2O, CH3OH, C2H5OH) solution, following the order HO- > AcO- > Cl- > Br- > NO3- > I- > NCS-. Evidence is provided that the observed effect does not originate from ion-pairing. A simple explanation is provided in terms of concordant hydrogen bond bridges of exalted stability between the gegenions, M+···OR-H···(OR-H)n···OR-H···A-. It is proposed that encapsulation of alkali ion by the macrocyclic ligand leads to a dissipation of the cation charge density destroying its ability to participate in the hydrogen bond bridge. An opposition against the alkali ion-crown complex formation arises accordingly in the solution in dependence on strength of the hydrogen bridge; for a given cation, the hydrogen bond strength increases with increasing anion charge density from NCS- to HO-(RO-). It is pointed out, at the same time, that the observed anion effect does not correlate with the known values of activity coefficients of the individual alkali salts which are almost insensitive to anion variation under the investigated conditions. As a resolution of the apparent paradoxon it is proposed that, in absence of the macrocyclic ligand, the stabilizing (concordant) bonding between the gegenions is nearly balanced by a destabilizing (discordant) hydrogen bonding between the ions of same charge (co-ions). Intrinsic differences among the individual salts are thus submerged in protic solvents and become apparent only when the concordant bonding is suppressed in the alkali ion-crown complex formation.

A New Host Lattice Built of the Werner-Type Copper(I,II) Cyanide Complex Involving a Macrocyclic Ligand

1998 ◽  
Vol 63 (5) ◽  
pp. 622-627 ◽  
Author(s):  
Hidetaka Yuge ◽  
Takayoshi Soma ◽  
Takeshi Ken Miyamoto
Keyword(s):  
Macrocyclic Ligand ◽  
Host Lattice ◽  
Macrocyclic Complex ◽  
Monoclinic Space Group ◽  
Cyanide Complex ◽  
New Host ◽  
Space Group

Crystals of a new clathrate [CuII(hmtd)CuI(CN)3]·CH2Cl2 were afforded from a Me2CO-EtOH-CH2Cl2 solution of a macrocyclic complex CuII(hmtd)CuI(CN)3·2 H2O (hmtd = 5,7,7,12,14,14-hexamethyl- 1,4,8,11-tetraazacyclotetradeca- 4,11-diene). It crystallizes in the monoclinic space group P21/n, a = 7.936(5), b = 18.717(4), c = 17.783(6) Å, β = 98.55(4)°, Z = 4, R = 0.0558 for 1 870 reflections. Unprecedentedly, only one of the three nitrogen-ends of a CuI(CN)3 moiety is coordinated to the square-pyramidal Cu(II) center. The guest CH2Cl2 molecules are captured in the channel between the potlid-shaped [CuII(hmtd)CuI(CN)3] molecules.

Silyl–Hydrosilane Exchange at a Magnesium Triphenylsilyl Complex Supported by a Cyclen-DerivedNNNN-Type Macrocyclic Ligand

2017 ◽  
Vol 56 (24) ◽  
pp. 14979-14990 ◽  
Author(s):  
Lara E. Lemmerz ◽  
Valeri Leich ◽  
Daniel Martin ◽  
Thomas P. Spaniol ◽  
Jun Okuda
Keyword(s):  
Macrocyclic Ligand
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