Versatility of copper(II) coordination compounds with 2,3-bis(2-pyridyl)pyrazine mediated by temperature, solvents and anions choice
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MELNIK, 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
Volumul 82 / 2018 / ISSN 1293-2558 /ISSNe 1873-3085

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

DOI: https://doi.org/10.1016/j.solidstatesciences.2018.05.008

Pag. 1-12

Melnik E.1, Kravtsov Victor1, Kramer Karl W2, Van Leusen Jan3, Decurtins Silvio2, Liu Shi-Xia2, 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), Crystal engineering, 3-Bis(2-pyridyl)pyrazine complexes, Stacking

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<dc:creator>Melnic, E.I.</dc:creator>
<dc:creator>Kravţov, V.H.</dc:creator>
<dc:creator>Kramer, K.</dc:creator>
<dc:creator>Van Leusen, J.</dc:creator>
<dc:creator>Decurtins, S.</dc:creator>
<dc:creator>Liu, S.</dc:creator>
<dc:creator>Kogerler, P.</dc:creator>
<dc:creator>Baca, S.G.</dc:creator>
<dc:date>2018-08-13</dc:date>
<dc:description xml:lang='en'><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>&middot;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>)&middot;(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>&minus;</sup> = acetylacetonate, ox<sup>2&minus;</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>&minus;</sup> to produce [Cu<sub>2</sub>(acdpp)<sub>2</sub>(Cl)<sub>4</sub>]&middot;2(MeOH) (8). The structure of 1 consists of neutral, mononuclear [Cu(acac)(dpp)(NO<sub>3</sub>)] units with acac<sup>&minus;</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>&minus;</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></dc:description>
<dc:identifier>10.1016/j.solidstatesciences.2018.05.008</dc:identifier>
<dc:source>Solid State Sciences  () 1-12</dc:source>
<dc:subject>2</dc:subject>
<dc:subject>coordination polymers</dc:subject>
<dc:subject>Copper(II)</dc:subject>
<dc:subject>Crystal engineering</dc:subject>
<dc:subject>3-Bis(2-pyridyl)pyrazine complexes</dc:subject>
<dc:subject>Stacking</dc:subject>
<dc:title>Versatility of copper(II) coordination compounds with 2,3-bis(2-pyridyl)pyrazine mediated by temperature, solvents and anions choice</dc:title>
<dc:type>info:eu-repo/semantics/article</dc:type>
</oai_dc:dc>