Versatility of copper(II) coordination compounds with 2,3-bis(2-pyridyl)pyrazine mediated by temperature,solvents and anions choice |
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| Institution: | 2. Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia;3. Department of Anesthesia and Pain Medicine, Maastricht UMC, Maastricht, The Netherlands;4. Cardiac Anaesthesia and Critical Care, University Hospital Southampton, Southampton, UK;5. Department of Anesthesia and Critical Care Medicine, Azienda Ospedaliero-Universitaria Pisana, Pisa, Italy;6. Department of Anesthesiology and Pain Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland |
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| Abstract: | 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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| Keywords: | Crystal engineering Copper(II) 2 3-Bis(2-pyridyl)pyrazine complexes Coordination polymers Stacking |
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