Three-dimensional Cu(II) coordination grid with the triiodide anion template
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MALAESTEAN, Yurii, SHOVA, Sergiu, KRAVTSOV, Victor, FONARI, Marina. Three-dimensional Cu(II) coordination grid with the triiodide anion template. In: Materials Science and Condensed Matter Physics, Ed. 8-th Edition, 12-16 septembrie 2016, Chişinău. Chişinău: Institutul de Fizică Aplicată, 2016, Editia 8, p. 150. ISBN 978-9975-9787-1-2.
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Materials Science and Condensed Matter Physics
Editia 8, 2016
Conferința "International Conference on Materials Science and Condensed Matter Physics"
8-th Edition, Chişinău, Moldova, 12-16 septembrie 2016

Three-dimensional Cu(II) coordination grid with the triiodide anion template


Pag. 150-150

Malaestean Yurii1, Shova Sergiu2, Kravtsov Victor1, Fonari Marina1
 
1 Institute of Applied Physics, Academy of Sciences of Moldova,
2 “Petru Poni” Institute of Macromolecular Chemistry
 
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Disponibil în IBN: 29 iulie 2019


Rezumat

So far, the research on microporous metal−organic frameworks (MMOFs) has been very creative, motivated by the need to get molecule-based porous materials having different functions and to understand their structure−property relationships. An important synthetic strategy to create MMOFs is to introduce the appropriate guest molecules / ions as templates trapped within the framework that can be released easily. MMOFs with iodine as a guest are among the particularly fascinating for the reasons of the particular chemistry of iodine such as polarity, oxidizability, and conductivity. In the reported MMOFs bearing iodine guests, the iodine molecules were introduced by guest exchange, by diffusion in iodine vapor, or by polyiodide anions inclusion [1-4]. The Cu(II) complexes are exceptionally relevant for crystal engineering being the framework-build regulator, suitable for ligand replacement in axial positions and resulting in a 4+2 coordination. In the presence of the 4,4’-bpy ligand, the anions tend to sit at the axial sites of the Cu(II) ion [5]. By utilizing this tendency and by introducing additional coexistent anions, the control of the framework by anions could be carried out. Herein, we report the 3D porous coordination polymer, {Cu(II)(4,4’bpy)(NO3)I3}n.xH2O obtained from copper(II) nitrate and 4,4’-bipyridine in the presence of potassium iodide as a source of polyiodide template.   View of the 3D regular grid along the a and c axes.   The compound crystallizes in the orthorhombic Cmca space group. The 3D network is based on a cationic square grid of [Cu(4,4’-bpy)2]n and pillar NO3- nitrate anions. The bridging NO3- anions provide a 4+2 copper environment. This network affords ca.10.1 x 11.1 Å2 channels along the aaxis, and ca. 6.8 x 10.1 Å2 channels along the c-axis. The channels that constitute 55.0% of the unit cell volume are filled with I3- anions and disordered water molecules. The iodine release occurs at 105 0C and accompanied by the ~ 18 % weight, the consecutive multistep degradation of network finishes at 393 0C. The anion-exchange and adsorption properties of this network are in progress.