کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1336986 1500287 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Coordination of expanded terpyridine ligands to cobalt
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Coordination of expanded terpyridine ligands to cobalt
چکیده انگلیسی

The tridentate expanded terpyridine-like ligand N,N′-dimethyl-N,N′-dipyridin-2-yl-pyridin-2,6-diamine (ddpd) and [Co(H2O)6](BF4)2 give the high-spin complex mer-[Co(ddpd)2](BF4)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 CoII complex to CoIII is achieved with silver triflate. The self exchange between high-spin CoII and low-spin CoIII is slow on the NMR time scale.

The tridentate expanded terpyridine-like ligand N,N’-dimethyl-N,N’-dipyridin-2-yl-pyridin-2,6-diamine (ddpd) and [Co(H2O)6](BF4)2 give the high-spin complex mer-[Co(ddpd)2](BF4)2 with a tetragonally compressed CoN6 coordination geometry (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. The self exchange between high-spin CoII and low-spin CoIII is slow on the NMR time scale.Figure optionsDownload as PowerPoint slideHighlights
► Synthesis of high-spin mer-[Co(ddpd)2](BF4)2 (X-ray diffraction, SQUID).
► The ligand field splitting is close to the high-spin/low-spin crossover point.
► The self exchange between CoII and CoIII is slow on the NMR time scale.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polyhedron - Volume 52, 22 March 2013, Pages 576–581
نویسندگان
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