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

Melnic, Elena; Kravtsov, Victor Ch; Krämer, Karl; van Leusen, Jan; Decurtins, Silvio; Liu, Shi-Xia; Kögerler, Paul; Baca, Svetlana G. (2018). Versatility of copper(II) coordination compounds with 2,3-bis(2-pyridyl)pyrazine mediated by temperature, solvents and anions choice. Solid state sciences, 82, pp. 1-12. Elsevier 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 in a dimeric entity, whereas an oxalate linker joins [Cu(Hdpp)(Cl)2(H2O)]+ units into a dimer in 4. The 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 through the dpp ligand.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry
08 Faculty of Science > Other Institutions > Emeriti, Faculty of Science

UniBE Contributor:

Krämer, Karl; Decurtins, Silvio and Liu, Shi-Xia

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry

ISSN:

1293-2558

Publisher:

Elsevier

Language:

English

Submitter:

Silvio Decurtins

Date Deposited:

24 May 2018 12:21

Last Modified:

16 Jul 2018 01:31

Publisher DOI:

10.1016/j.solidstatesciences.2018.05.008

BORIS DOI:

10.7892/boris.116625

URI:

https://boris.unibe.ch/id/eprint/116625

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