Novel iron(II) and copper(ii) polymeric coordination compounds with N,N′-bipyridine-type ligands: synthesis and characterization
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VITIU(BOLDIŞOR), Aliona. Novel iron(II) and copper(ii) polymeric coordination compounds with N,N′-bipyridine-type ligands: synthesis and characterization. In: Chemistry Journal of Moldova. 2019, nr. 1(14), pp. 120-127. ISSN 1857-1727.
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Chemistry Journal of Moldova
Numărul 1(14) / 2019 / ISSN 1857-1727 /ISSNe 2345-1688

Novel iron(II) and copper(ii) polymeric coordination compounds with N,N′-bipyridine-type ligands: synthesis and characterization


CZU: 544.182.342+548.2/.9
DOI: 10.19261/cjm.2019.569
Pag. 120-127

Vitiu(Boldişor) Aliona
 
Institute of Applied Physics
 
Disponibil în IBN: 11 iulie 2019


Rezumat

Two new coordination compounds {(bpyH2)·[Fe(bpy)2(H2O)2(SO4)2]·2(H2O)}n (1) and {[Cu(bpp)2(H2O)]·(BF4)2·dmf·0.75(H2O)}n (2), (where, bpy= 4,4'-bipyridine and bpp= 1,3-bis(4-pyridyl)propane, dmf= N,N-dimethylformamide) have been synthesized by slow evaporation method based on rigid and flexible bis(pyridine) ligands. The obtained compounds were characterized by thermal analysis, FT-IR spectroscopy and single crystal X-ray diffraction analysis. The structure of 1 is a channel-containing open framework constructed through the hydrogen-bonding supported by the criss-cross arrangement of the 1D Fe-bpy anionic chains, in which the surrounding of the metal atom is completed by oxygen atoms belonging to water molecules and SO42- anions. The structure of 2 is formed by a one-dimensional polymeric cationic chain, in which the four bpp ligands connect with Cu(II) by four nitrogen atoms and one oxygen atom that belongs to a molecule of water that completes the surrounding of each metal atom. The complexes crystallize in the monoclinic space groups C2/c and P21 respectively, where Fe(II) and Cu(II) ions present a N2O4 octahedral and N4O square pyramidal environment. The hydrophilic regions absorb bpyH22+ and water molecules in 1 and BF4- anions, water and dmf molecules in 2, which are held in the crystal lattices via hydrogen bonds.

Cuvinte-cheie
crystalline coordination polymer, bridging ligand, supramolecular system, π–π stacking interaction