Synthesis and Structure of (2 × 2) Molecular Grid Copper(II) and Nickel(II) Complexes with a New Polydentate Oxime-Containing Schiff Base Ligand
作者： Yurii S. Moroz , Kinga Kulon , Matti Haukka , Elżbieta Gumienna-Kontecka , Henryk Kozłowski
DOI: 10.1021/IC702375H
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摘要: A new polynucleating oxime-containing Schiff base ligand, 2-hydroxyimino-N′-[1-(2-pyridyl)ethylidene]propanohydrazone (Hpop), has been synthesized and fully characterized. pH potentiometric, electrospray ionization mass spectrometric, spectrophotometric studies of complex formation in H2O/DMSO solution confirmed the preference for polynuclear complexes with 3d metal ions. Single-crystal X-ray diffraction analyses [Ni4(pop)4(HCOO)4]·7H2O (1), [Cu4(pop-H)4(HCOOH)4]·H2O (2), [Cu4(pop-H)4(H2O)4]·9H2O (3) indicated presence a [2 × 2] molecular grid structure all three compounds but distinct configurations cores: head-to-tail ligand arrangement overall S4 symmetry Cu2+ as opposed to head-to-head (noncrystallographic) C2 Ni2+ complex. cryomagnetic study 3 revealed intramolecular ferromagnetic exchange between copper ions grid, while 1, antiferromagnetic interactions ion...
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