Versatility of copper(II) coordination compounds with 2,3-bis(2-pyridyl)pyrazine mediated by temperature, solvents and anions choice
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MELNIC, Elena; KRAVTSOV, Viktor; KRAMER, Karl W; VAN LEUSEN, Jan; DECURTINS, Silvio; LIU, Shixia; KOGERLER, Paul; BACA, Svetlana. Versatility of copper(II) coordination compounds with 2,3-bis(2-pyridyl)pyrazine mediated by temperature, solvents and anions choice. In: Solid State Sciences. 2018, nr. 82, pp. 1-12. ISSN 1293-2558.
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Solid State Sciences
Numărul 82 / 2018 / ISSN 1293-2558

Versatility of copper(II) coordination compounds with 2,3-bis(2-pyridyl)pyrazine mediated by temperature, solvents and anions choice


DOI: 10.1016/j.solidstatesciences.2018.05.008
Pag. 1-12

Melnic Elena1, Kravtsov Viktor1, Kramer Karl W2, Van Leusen Jan3, Decurtins Silvio2, Liu Shixia2, Kogerler Paul3, Baca Svetlana1
 
1 Institute of Applied Physics,
2 University of Bern,
3 RWTH Aachen University
 
Disponibil în IBN: 7 decembrie 2018


Rezumat

Tuning reaction temperatures as well as the variation in starting copper salts and solvents led to the formation of a new series of Cu(II) coordination compounds with 2,3-bis(2-pyridyl)pyrazine (dpp): a mononuclear [Cu(acac)(dpp)(NO3)] (1) complex, two dinuclear [Cu2(acac)2(dpp)(NO3)(H2O)]NO3 (2) and [Cu2(Hdpp)2(ox)(Cl)2(H2O)2]Cl2·6(H2O) (4) complexes, and four coordination polymers {[Cu4(dpp)2(ox)(Cl)6]}n (3), {[Cu4(dpp)2(ox)(NO3)6(H2O)2]∙1.2(H2O)}n (5), {[Cu(dpp)(NO3)](NO3)·(H2O)}n (6) and {[Cu(dpp)(SO4)(H2O)2]}n (7), where acac = acetylacetonate, ox2− = oxalate. Remarkably, the treatment of Cu(II) chloride dihydrate with dpp in methanol solution led to an unusual in situ condensation of dpp with acac to produce [Cu2(acdpp)2(Cl)4]·2(MeOH) (8). The structure of 1 consists of neutral, mononuclear [Cu(acac)(dpp)(NO3)] units with acac and dpp acting as bidentate ligands. In 2, the dpp ligand coordinates in a bis-chelating mode to two Cu(II) ions and bridges them into a dimeric entity, whereas an oxalate linker joins [Cu(Hdpp)(Cl)2(H2O)]+ units into a dimer in 4. Compounds 3, 5, 6 and 7 are 1D chain coordination polymers, which incorporate two symmetry independent metal centers and different bridging ligands: Hdpp+ as a protonated cationic or dpp as a neutral chelating ligand and oxalate, Cl anions or sulfate di-anions as bridging ligands. Magnetic studies were performed on samples 1 and 2, and the analysis reveals a very weak magnetic exchange coupling mediated via the dpp ligand.

Cuvinte-cheie
2, coordination polymers, Copper(II),

3-Bis(2-pyridyl)pyrazine complexes, Crystal engineering, Stacking