Naslov
Supramolecular Chemistry of Some Metal Acetylacetonates with Auxiliary Pyridyl Sites

Autori
Gunawardana, Chamara A. ; Sinha, Abijeet S ; Desper, John ; Đaković, Marijana ; Aakeröy, Christer B.

Izvornik
Crystal growth & design (1528-7483) 18 (2018), 11; 6936-6945

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
supramoelcualr systems ; coordination compounds ; hydrogen bonds

Sažetak
Hetero-bifunctional ligands can pave the way for elaborate metallo-supramolecular systems and are also useful for combining metal−ligand bonding with other types of noncovalent interactions. We synthesized two new pyridyl-acetylacetonate ligands, 3-(4-(pyridin-4-yl)phenyl)pentane-2, 4-dione (L1) and 3-(4-(pyridin-4-ylethynyl)phenyl)-pentane-2, 4-dione (L2), and explored their metal binding ability with selected di- and trivalent transition metal ions. As expected, the acetylacetonate ligation with metal dications remains consistent among four structures, [Cu(L1)2- 19 (MeOH)2]n, [Co(L2)2]n, [Cu(L2)2(MeOH)2], and [Zn-(L2)2(MeOH)2] ; the metal is four-coordinate and resides in a square planar environment. Differences in the overall architectures arise basically from the role played by the terminal heterocycle (i.e., the pyridyl group). In [Cu(L1)2(MeOH)2]n and [Co(L2)2]n, the heterocyclic end directly binds to the metal (through vacant axial positions), thereby producing coordination networks. In [Cu(L2)2(MeOH)2] and [Zn(L2)2(MeOH)2], metal-methanol coordination and intermolecular O−H(methanol)···N(pyridine) hydrogen-bond interactions work in concert to weave those bis-acetylacetonate complexes into ribbon-like supramolecular polymeric arrays. Somewhat surprisingly, the only tris-chelated acetylacetonate complex characterized in this study, [Fe(L2)3], essentially exists as discrete dimeric aggregates.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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