Oligonuclear Fe Complexes (Fe, Fe₄, Fe₆, Fe₉) Derived from Tritopic Pyridine Bis-Hydrazone Ligands—Structural, Magnetic, and Mössbauer Studies

Abstract

Tri-topic pyridine bis-hydrazone ligands produce polynuclear complexes with Fe(II) and Fe(III) salts with varying nuclearity and metal ion oxidation states. Mononuclear, tetranuclear, hexanuclear, and nonanuclear examples are discussed using structural, magnetic and Mössbauer data. In one case, although X-ray data suggest a [3 × 3] Fe9 grid (space group P42/n), careful examination of the structure, in conjunction with magnetic and Mössbauer data, indicates an unusual situation where the corner and center sites are present at unit occupancy, whereas side site occupancy is ∼0.6.

Detection of dopamine on a mercapto-terminated hexanuclear Fe(III) cluster modified gold electrode

“…In the last two decades, the development of advanced functional poly-nuclear iron-oxo clusters has gained increased interest in magnetic materials, bioinorganic, and biological chemistry [1][2][3][4][5]. A serial of poly-iron clusters containing bridging oxygen centers (such as Fe2, Fe3, Fe6) have been synthesized and their magnetic properties have been investigated [1,3].…”

“…A serial of poly-iron clusters containing bridging oxygen centers (such as Fe2, Fe3, Fe6) have been synthesized and their magnetic properties have been investigated [1,3]. Furthermore, poly-nuclear ironoxo complexes can be used as a biomimetic analogue [5,6].…”

Recent developments in supramolecular complexes of azabenzenes containing one to four N atoms: synthetic strategies, structures, and magnetic properties

“…These polytopic pyridine-based ligands are widely utilized in self-assembled [n  n] and [n  m] grid complex formations. [36][37][38][39][40][41][42] Some of these ligands, based on the recent literature, which have potential towards selfassembly for the syntheses of polymetallic complexes are described in this current review (Scheme 1).…”