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SM ISO690:2012 MELNIK, E., COROPCEANU, Eduard, FONARI, Marina, KRAVTSOV, Victor. Anion exchange in Cu(II) one-dimensional coordination polymers with Cu-(2,2’-BIPY) and Cu-(O-phen) corner fragments. In: Materials Science and Condensed Matter Physics, Ed. 7, 16-19 septembrie 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2014, Editia 7, p. 163. |
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Materials Science and Condensed Matter Physics Editia 7, 2014 |
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Conferința "Materials Science and Condensed Matter Physics" 7, Chișinău, Moldova, 16-19 septembrie 2014 | |||||||
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Pag. 163-163 | |||||||
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Rational design of metal-organic materials with needed architecture and properties is in focus of crystal engineers and materials scientists for decades. Several useful approaches relying on the usage of the preliminary constructed metal-building blocks, manipulation by the bridging and terminal ligands, templating cations and anions, the synthetic conditions, and post-synthetic modifications prove their efficacy [1-2]. The intrinsic properties of the copper metal ion suggesting different coordination numbers and geometries, available redox states, thermodynamic and kinetic characteristics on one hand, and its fascinating magnetic and biochemical properties on another hand, explain this metal unique place in magneto- and medicinal chemistry, and in crystal engineering [3]. A combination of the Cu(II)-2,2‟-bipy and Cu(II)-o-phen corner fragments with the bridging ligands, 4,4‟-bipyridine (4,4‟-bipy) and 4,4‟-bipyridinepropane (bpp) in the presence of the framework-regulator tetrahedral ClO4 - or BF4 - anions [2,4] provides a series of porous onedimensional (1D) coordination polymers, [Cu(2,2‟-bipy)(4,4‟-bipy)(ClO4)2]n .nH2O (1), {[Cu(2,2‟- bipy)(bpp)(ClO4)(H2O)][ClO4]}n . (2), {[Cu(o-phen)(bpp)(ClO4)(DMF)][ClO4]}n . (3), and {[Cu(ophen)( bpp)(BF4)2][Cu(o-phen)(bpp)2] [BF4]2}n . (4), using copper fluoride, CuF2 as the starting salt. The final materials represent anionic (1, 3), neutral (2) or mixed anionic / neutral (4a,b) tapes that differ by the degree of corrugation, the Cu(II) coordination cores being N4O2 in 1, 2, 3, N4F2 in 4a and N5 in 4b, and function of the templating anions, that either coordinate to the metal in 1 or coordinate and freely locate in the channels constructed from a host network in the other structures (Figure 1). The details of the metal coordination geometry, anion exchange, conformational flexibility of the bridging ligands, and crystal packing efficacy are discussed. |
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