On a Way to New Types of the Hybrid Polyazomethine-Pyrazolate Metal Pseudomacrobicyclic Complexes: the Synthesis and Structure of their Ligand Synthonesстатья
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Дата последнего поиска статьи во внешних источниках: 18 марта 2017 г.
Аннотация:3-Acetylpyrazole hydrazone, its formyl- and carboxymethyl-containing analogs and the bis-pyrazolyl azine derivative were obtained in moderate yields by condensation under vigorous reaction conditions and characterized using elemental analysis, LC-mass spectrometry, IR, H-1 and C-13{H-1} NMR spectroscopies, and X-ray diffraction crystallography (for a bis-pyrazolyl azine compound). The X-rayed molecule occupies a special position with an inversion centre; beside planarity of its C=N-N=C moiety, the corresponding C-N and N-N bond lengths suggest the absence of a conjugation in this diazomethine fragment, whereas those in the pyrazolyl cycles clearly suggest a delocalization of the electron density. The azine molecules form hydrogen-bonded layers that are parallel to the crystallographic plane (100). Although these molecules are almost planar, pi-stacking interactions between them are absent, and 2D layers are connected via van-der-Waals C-H... pi interactions at the distances of 2.695 angstrom. The compounds obtained were described to be suitable organic synthones for the synthesis of mono-and binuclear hybrid polyazomethine-pyrazolate metal pseudomacrobicyclic complexes.