A Click-Functionalized Single-Molecule Magnet Based on Cobalt(II) and Its Analogous Manganese(II) and Zinc(II) Compounds

• Published in: European journal of inorganic chemistry Vol. 2015; no. 3; pp. 370 - 374
• Main Authors: Plenk, Christian, Krause, Jasmin, Rentschler, Eva
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 01.01.2015; WILEY‐VCH Verlag; Wiley Subscription Services, Inc
• Subjects: Alternating current; Azides; Barriers; Click chemistry; Cobalt; Cycloaddition; Magnetic properties; Metal ions; NMR spectroscopy; Stability; Structural integrity; Zinc
• ISSN: 1434-1948; 1099-0682
• DOI: 10.1002/ejic.201402955

A mononuclear CoII single‐molecule magnet suitable for click chemistry was investigated. [M(oda)(aterpy)] complexes (oda2– = oxodiacetate, aterpy = 4′‐azido‐2,2′:6′,2″‐terpyridine) with M = MnII, ZnII, and CoII were synthesized as azide‐functionalized building blocks for the copper‐catalyzed azide–alkyne cycloaddition reaction. The required structural integrity of the complexes in solution was proven in great detail by using ESI‐MS and NMR spectroscopy. For the six‐coordinate [Co(oda)(aterpy)] complex, single‐molecule magnet behavior was confirmed with an effective energy barrier of 4.2 cm–1. An azide‐functionalized single‐molecule magnet suitable for click reactions is reported. The solution stability of three novel building blocks containing single CoII, MnII, and ZnII metal ions is proven in great detail by using ESI‐MS and NMR spectroscopy. Remarkably, alternating current susceptibility data of the six‐coordinate cobalt(II) complex reveal single‐molecule magnet behavior.