Structure of meso-5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane dihydrate

Gluziński, P.; Krajewski, J. W.; Urbańczyk‐Lipkowska, Zofia

doi:10.1107/s0567740880006978

Cited by 8 publications

(3 citation statements)

References 6 publications

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“…Tetraazamacrocyclic, 5,5,7,12,12,14‐hexamethyl‐1,4,8,11‐tetraazacyclotetradecane (1,7‐CTH) has two diastereoisomeric forms, C‐meso ‐1,7‐CTH or Tet‐A and C‐racemic ‐1,7‐CTH or Tet‐B (Misra et al ., ). While treating with hydrochloric acid in ethanolic solution of them, they could be converted to their tetrahydrochloric salts (Protonated form of Tet‐A and Tet‐B, Scheme ) (Krajewski et al ., ; Gluzinski et al ., ). Their aqueous solutions show pH 2.0.…”

Section: Resultsmentioning

confidence: 99%

“…The tetraazamacrocyclic molecule 5,5,7,12,12,14‐hexamethyl‐1,4,8,11‐tetraazacyclotetradecane (1,7‐CTH) exhibits two diastereoisomeric forms, C‐meso ‐1,7‐CTH or Tet‐A and C‐racemic ‐1,7‐CTH or Tet‐B, and were prepared following the reported well‐established method (Misra et al ., ). The tetrahydrochloride salts of Tet‐A and Tet‐B as Tet‐A.4HCl and Tet‐B.4HCl (Krajewski et al ., ; Gluzinski et al ., ) were prepared by dissolving the free bases in ethanol and adding a few drops of concentrated HCl. The precipitate were filtered off, dried, and recrystallized from ethanol‐water mixture to give colorless crystals.…”

Section: Methodsmentioning

confidence: 97%

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Recognition of silver nanoparticles surface‐adsorbed citrate anions by macrocyclic polyammonium cations: a spectrophotometric approach to study aggregation kinetics and evaluation of association constant

Choudhury

Purkayastha

Debnath

et al. 2016

J of Molecular Recognition

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In this report, we have studied the recognition of citrate anions adsorbed on the surface of silver nanoparticles (cit-Ag-NPs), by macrocyclic polyammonium cations (MCPACs): Me6 [14]ane-N4 H8 (4+) (Tet-A/Tet-B cations) and [32]ane-N8 H16 (8+) , which are well reputed anion recognizers and are treated as to mimic of biological polyamines. The study was monitored on ultraviolet-visible spectroscopy by performing a titration of the aqueous dispersion of the cit-Ag-NPs by the aqueous solution of MCPACs. The ultraviolet-visible time-scan plots over the reduction of the absorption band of surface plasmon resonance of cit-Ag-NPs at 390 nm are well fitted with fourth-order polynomial equation and are employed to determine the initial aggregation rate constants. It has been stated that the aggregation is the result in electrostatic attraction followed by H-bond formation between the surface-adsorbed citrate anions and added MCPACs. The atomic force microscopy results have evidenced aggregation of cit-Ag-NPs in presence of MCPACs. The evaluated H-bonded association constant (Kasso ) using Benesi-Hildebrand method reveals that [32]ane-N8 H16 (8+) cations form stronger association complex, as expected, with the citrate anions than the Me6 [14]ane-N4 H8 (4+) cations. The study would thus provide the insight of molecular interactions involved in nanoparticle surface-adsorbed anions with biological polyamines. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 97%

Recognition of silver nanoparticles surface‐adsorbed citrate anions by macrocyclic polyammonium cations: a spectrophotometric approach to study aggregation kinetics and evaluation of association constant

Choudhury

Purkayastha

Debnath

et al. 2016

J of Molecular Recognition

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“…The macrocycle rac -CTH was prepared by the method reported in the literature . The purity was checked by elemental analysis, IR spectroscopy, and 1 H NMR.…”

Section: Methodsmentioning

confidence: 99%

Novel Bimetallic-Dicyanamide Extended Two- and Three-Dimensional Networks through [Cu(rac-CTH)]²⁺ Cation Templation

Suárez‐Varela

Moreno

Maimoun

et al. 2009

Crystal Growth & Design

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Reaction of [Cu(rac-CTH)] 2þ with dicyanamide and Mn 2þ or Fe 2þ produces three bimetallic extended structures. Complexes 1 and 2, both obtained in the same reaction pot, consist of two different (4,4) two-dimensional (2D) layers, with the [Cu(rac-CTH)(dca)] þ cations noncoordinated and coordinated to the Mn(μ 1,5 -dca) network for 1 and 2, respectively (rac- 5,7,12,12,4,8,. Complex 2 shows an unusual monodentate coordination mode through the central amide nitrogen of the dca ligand which is first reported for a polynuclear complex. The structure of 3 consists of a three-dimensional network which can be described as a stacking of layers made of heptanuclear defective cubane units, very similar to those found in 1. The magnetic properties of 3 are indicative of antiferromagnetic coupling with a magnetic phase change occurring at 19 K.

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The Specification of Bonding Cavities in Macrocyclic Ligands

Henrick

Tasker

Lindoy

1985

Progress in Inorganic Chemistry

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Structure of meso-5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane dihydrate

Cited by 8 publications

References 6 publications

Recognition of silver nanoparticles surface‐adsorbed citrate anions by macrocyclic polyammonium cations: a spectrophotometric approach to study aggregation kinetics and evaluation of association constant

Recognition of silver nanoparticles surface‐adsorbed citrate anions by macrocyclic polyammonium cations: a spectrophotometric approach to study aggregation kinetics and evaluation of association constant

Novel Bimetallic-Dicyanamide Extended Two- and Three-Dimensional Networks through [Cu(rac-CTH)]²⁺ Cation Templation

The Specification of Bonding Cavities in Macrocyclic Ligands

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Structure of meso-5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane dihydrate

Cited by 8 publications

References 6 publications

Recognition of silver nanoparticles surface‐adsorbed citrate anions by macrocyclic polyammonium cations: a spectrophotometric approach to study aggregation kinetics and evaluation of association constant

Recognition of silver nanoparticles surface‐adsorbed citrate anions by macrocyclic polyammonium cations: a spectrophotometric approach to study aggregation kinetics and evaluation of association constant

Novel Bimetallic-Dicyanamide Extended Two- and Three-Dimensional Networks through [Cu(rac-CTH)]2+ Cation Templation

The Specification of Bonding Cavities in Macrocyclic Ligands

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Novel Bimetallic-Dicyanamide Extended Two- and Three-Dimensional Networks through [Cu(rac-CTH)]²⁺ Cation Templation