Synthesis and chemistry of a molybdenum carbonyl phosphinite complex containing a ditopic macrocyclic ligand with chelating phosphorus-donor and crown ether characteristics

The ligand properties of [18]crown-6 towards Co(II) ions were studied by 1H and 13C NMR spectroscopy in nitromethane and nitromethane/methanol. The complexes [Co([18]crown-6)]++ and mer-[Co([18]crown-6)(CH3OH)3]++ which were detected in solution show ligand fluctuations on the NMR time scale. For the mixed complex a crown ether rotation occurs. Additionally, a synchronous process between the movement of the macrocyclic ligand and the dissociation reaction of methanol from the metal ion is observed.

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The Chemistry of Macrocyclic Ligand Complexes

10.1017/cbo9780511564376 ◽

1989 ◽

Cited By ~ 371

Author(s):

L. F. Lindoy

Keyword(s):

Macrocyclic Ligand

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Preparation and Gas Sensitivity of Crown Ether Metal Complex Film Gas Sensor

Material Science and Engineering ◽

10.35534/mse.0201001 ◽

2020 ◽

Vol 2 (1) ◽

pp. 1-12

Author(s):

Gulgina Mamtimin ◽

Halisa Arkin ◽

Patima Nizamidin ◽

Erkin Tursun ◽

Abliz Yimit

Keyword(s):

Crown Ether ◽

Metal Complex ◽

Gas Sensor ◽

Gas Sensitivity ◽

Complex Film

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Evaluation of a Direct 1H NMR Method for Determining Log K and Delta H Values for Crown Ether-Alkylammonium Cation Complexation

10.21236/ada228585 ◽

1990 ◽

Author(s):

C. Y. Zhu ◽

J. S. Bradshaw ◽

J. L. Oscarson ◽

R. M. Izatt

Keyword(s):

Crown Ether ◽

1H Nmr ◽

Cation Complexation ◽

Nmr Method ◽

Alkylammonium Cation

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Azaoxa Macrocyclic and Acyclic Complexesof Lanthanides

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19980363 ◽

1998 ◽

Vol 63 (3) ◽

pp. 363-370 ◽

Cited By ~ 13

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.

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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

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19901149 ◽

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.

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

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19980622 ◽

1998 ◽

Vol 63 (5) ◽

pp. 622-627 ◽

Cited By ~ 5

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.

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