Coordination of expanded terpyridine ligands to cobalt

作者：Foerster Christoph; Mack Katharina; Carrella Luca M; Ksenofontov Vadim; Rentschler Eva; Heinze Katja^*

来源：Polyhedron, 2013, 52: 576-581.

DOI：10.1016/j.poly.2012.08.008

• Cobalt
• Magnetism
• N-ligands
• Paramagnetic NMR spectroscopy
• Redox chemistry
• Tridentate ligands

The tridentate expanded terpyridine-like ligand N,N%26apos;-dimethyl-N,N%26apos;-dipyridin-2-yl-pyridin-2,6-diamine (ddpd) and [Co(H2O)(6)](BF4)(2) give the high-spin complex mer-[Co(ddpd)(2)](BE4)(2) with a tetragonally compressed CoN6 coordination geometry according to X-ray diffraction and SQUID measurements. UV-Vis-NIR spectra indicate a large ligand field splitting close to the high-spin/low-spin crossover point. Oxidation of the Co-II complex to Co-III is achieved with silver triflate. The self exchange between high-spin Co-II and low-spin Co-III is slow on the NMR time scale.

• 出版日期2013-3-22