Crown Ethers, Double-Decker, and Sandwich Complexes: Cation-Mediated Formation of Metallatopomer Coronates

Synthesis and structure of : A new member of anion encapsulating metallamacrocyles

“…These juxtaposed 5-and 6- [14]. Stacking metallacrowns [15,16], dimers and fused metallacrowns [17], metallacryptates [18], and metallahelicates [19] have all been reported. A series of organometallic metallacrowns [20], metallacalixarenes [21], and other metallamacrocycles can also act as inorganic molecular hosts capable of selectively binding cationic, anionic, and neutral guests [22][23][24].…”

The new multi-directional polydentate ligand 2,4,6-(di-pyridin-2-yl-amino)-[1,3,5]triazine (dpyatriz) can discriminate between Zn(II) and Co(II) nitrate

“…Ligand field spectra of the solid compounds were recorded on a PerkinÁ/Elmer Lambda 900 UV Á/VisÁ/ NIR spectrometer in the diffuse reflectance mode with MgO as reference. 2,4,6-(Di-pyridin-2-yl-amino)- [1,3,5]triazine (dpyatriz) was prepared as previously described [15]. …”

“…Results and discussion 3.1. Ligand synthesis, structure and general observations 2,4,6-(Di-pyridin-2-yl-amino)- [1,3,5]triazine (dpyatriz, (1), Fig. 1) was synthesized from 2,4,6-trichloro-1,3,5-triazine and 2,2?-pyridylamine according to a published procedure [15].…”

“…In the present study, it was investigated whether the large, potentially nonadentate polypyridyl ligand 2,4,6-(di-pyridin-2-yl-amino)- [1,3,5]triazine (dpyatriz) [14], could discriminate between two rather similar metal ions such as Zn(II) and Co(II). Therefore, representative nitrate complexes were prepared and structurally characterized; for comparison also the structure of the free ligand is reported.…”

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The new multi-directional polydentate ligand 2,4,6-(di-pyridin-2-yl-amino)- [1,3,5] , where each ligand binds to three Zn ions. Two of the Zn ions are five coordinated in a ZnO 3 N 2 chromophore (the trigonal bipyramidal geometry is completed by two monodentate nitrato ligands).

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