Reaction of nickel(II) nitrate with the dpyatriz ligand, namely 2,4,6-tris(bis(pyridin-2-yl)amino)-1,3,5-triazine, in acetonitrile produces a tetranuclear Ni-II coordination compound, [Ni-4(dpyatriz)(2)(NO3)(8)(CH3CN)(2)(H2O)(2)]center dot 2CH(3)CN (1), the crystal structure of which has been determined by X-ray diffraction using a synchrotron source. 1 has been characterized by IR and UV-vis spectroscopy, elemental and thermogravimetric analyses, and magnetic susceptibility measurements. Its solid-state structure exhibits remarkable anion center dot center dot center dot pi interactions between coordinated nitrate ions and the triazine rings. In addition, a thorough X-ray powder diffraction study has revealed a number of pseudopolymorphic phases (2-5), resulting from various degrees of hydration/solvation of the [Ni-4(dpyatriz)(2)] core. The interconversion scheme among the different phases has been determined using controlled heating, and the basic structural features of the different pseudopolymorphs have been assessed through ab initio powder diffraction methods.
|Titolo:||Rich pseudopolymorphic behavior of the tetranuclear [Ni-4(dpyatriz)(2)(NO3)(8)] complex|
|Parole Chiave:||ANION-PI INTERACTIONS CRYSTALLOGRAPHIC EVIDENCE MAGNETIC-PROPERTIES POLYMORPHISM RECEPTOR SYNTHONS CRYSTAL LIGANDS RING UNIT|
|Settore Scientifico Disciplinare:||Settore CHIM/03 - Chimica Generale e Inorganica|
|Data di pubblicazione:||2007|
|Digital Object Identifier (DOI):||10.1021/ic0702015|
|Appare nelle tipologie:||01 - Articolo su periodico|