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 SM ISO690:2012MELNIK, E., KRAVTSOV, Victor, KRAMER, Karl W, VAN LEUSEN, Jan, DECURTINS, Silvio, LIU, Shi-Xia, 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, vol. 82, pp. 1-12. ISSN 1293-2558. DOI: https://doi.org/10.1016/j.solidstatesciences.2018.05.008 |
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  Solid State Sciences |
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| Volumul 82 / 2018 / ISSN 1293-2558 /ISSNe 1873-3085 | ||||||
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| DOI:https://doi.org/10.1016/j.solidstatesciences.2018.05.008 | ||||||
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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. |
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| Cuvinte-cheie 2, coordination polymers, Copper(II), Crystal engineering, 3-Bis(2-pyridyl)pyrazine complexes, Stacking |
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<cfTitle cfLangCode='EN' cfTrans='o'>Versatility of copper(II) coordination compounds with 2,3-bis(2-pyridyl)pyrazine mediated by temperature, solvents and anions choice</cfTitle>
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<cfAbstr cfLangCode='EN' cfTrans='o'><p>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)(NO<sub>3</sub>)] (1) complex, two dinuclear [Cu<sub>2</sub>(acac)<sub>2</sub>(dpp)(NO<sub>3</sub>)(H<sub>2</sub>O)]NO<sub>3</sub> (2) and [Cu<sub>2</sub>(Hdpp)<sub>2</sub>(ox)(Cl)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]Cl<sub>2</sub>·6(H<sub>2</sub>O) (4) complexes, and four coordination polymers {[Cu<sub>4</sub>(dpp)<sub>2</sub>(ox)(Cl)<sub>6</sub>]}<sub>n</sub> (3), {[Cu<sub>4</sub>(dpp)<sub>2</sub>(ox)(NO<sub>3</sub>)<sub>6</sub>(H<sub>2</sub>O)<sub>2</sub>]∙1.2(H<sub>2</sub>O)}<sub>n</sub> (5), {[Cu(dpp)(NO<sub>3</sub>)](NO<sub>3</sub>)·(H<sub>2</sub>O)}<sub>n</sub> (6) and {[Cu(dpp)(SO<sub>4</sub>)(H<sub>2</sub>O)<sub>2</sub>]}<sub>n</sub> (7), where acac<sup>−</sup> = acetylacetonate, ox<sup>2−</sup> = 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<sup>−</sup> to produce [Cu<sub>2</sub>(acdpp)<sub>2</sub>(Cl)<sub>4</sub>]·2(MeOH) (8). The structure of 1 consists of neutral, mononuclear [Cu(acac)(dpp)(NO<sub>3</sub>)] units with acac<sup>−</sup> 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)<sub>2</sub>(H<sub>2</sub>O)]<sup>+</sup> 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<sup>+</sup> as a protonated cationic or dpp as a neutral chelating ligand and oxalate, Cl<sup>−</sup> 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.</p></cfAbstr>
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