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Synthesis, structures and characterization of complexes containing a 2,6-bis(guanidinyl)pyridine ligand on iron(II), cobalt(II), nickel(II), copper(I), copper(II) and zinc(II)

In this work the bis(guanidinyl)pyridine ligand tbo2Pyr is synthesized and its coordination chemistry with a series of late first-row ions is explored. These complexes have various geometries with the tbo2Pyr ligand exhibiting both meridional (planar) and facial (puckered) coordination modes. [Displ...

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Bibliographic Details
Published in:Polyhedron 2018-11, Vol.155, p.77-84
Main Authors: Allen, James E., Kassel, W. Scott, Piro, Nicholas A.
Format: Article
Language:English
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Summary:In this work the bis(guanidinyl)pyridine ligand tbo2Pyr is synthesized and its coordination chemistry with a series of late first-row ions is explored. These complexes have various geometries with the tbo2Pyr ligand exhibiting both meridional (planar) and facial (puckered) coordination modes. [Display omitted] A new chelating guanidine ligand, 2,6-bis(tbo)pyridine (1, tbo = 1,4,6-triazabicyclooctene), was synthesized from Htbo and 2,6-dibromopyridine and its coordination chemistry with mid- and late-first-row transition metal ions (Fe2+, Co2+, Ni2+, Cu+, Cu2+ and Zn2+) was explored. The complexes [1-Fe(OTf)(MeCN)]OTf, [1-Co(OTf)(MeCN)]OTf, [1-Ni(MeCN)3](OTf)2, [1-Cu]OTf, [1-Cu(OTf)(MeCN)]OTf, and [1-Zn(OTf)2] were structurally characterized by X-ray diffraction. Across this series, 1 exhibits both facial and meridional coordination modes depending on metal ion size. The metal complexes were additionally characterized spectroscopically and electrochemically, revealing 1 as a weaker donor than several related guanidine-containing chelates.
ISSN:0277-5387
DOI:10.1016/j.poly.2018.08.012