Iron(III) complex of a tridentate NNN type ligand: synthesis, X-ray structure, thermal analysis and voltammetric studies

Abstract

A mononuclear iron(III) complex with 2,6-bis(3,4,5-trimethyl-N-pyrazolyl)pyridine (btmpp) has been synthesized, and characterized by X-ray crystallography, IR, UV-Vis and TGA-DTA methods. The Fe(III/II) couple was characterized by way of cyclic voltammetry using DMF solvent, where the complex was observed to have an irreversible behaviour.

Recent advances in the synthesis and applications of 2,6-dipyrazolylpyridine derivatives and their complexes

“…The weaker ligand field exerted on 15 a metal ion by bpp makes its complexes more labile in solution than corresponding complexes of terpy derivatives. 6 For this reason, terpy derivatives are still more widely used in metal/organic materials chemistry and self-assembly, because their complexes are more robust.…”

“…methyl), the subsequent chromatographic purification of the desired 3',3''-disubstituted isomer can be challenging. A number of 1-bpp derivatives bearing simple alkyl or aryl 20 substituents have been prepared in this way, 6,7,[14][15][16][17] including chiral derivatives produced using optically pure pyrazole reagents. 6 An exception to this generalisation is where indazole reagents are used, when eq 1 yields the more hindered 2,6-di(indazol-1-yl)pyridine products (1-bip, Scheme 1) in moderate 25 yield.…”

“…30 A [ReBr(CO 3 )] adduct of a related dithienyl-3-bpp derivative, whose 20 3-bpp fragment is only bidentate, is also strongly emissive. 141 Other polymetallic complexes where a 1-bpp or 3-bpp derivative acts as a simple 15 capping ligand are also known. 52,101,[142][143][144][145][146][147][148][149] Appending extra donor groups onto the 3-bpp skeleton gives further scope for high-nuclearity complex formation.…”

“…Tris-heterocyclic ligands continue to be very widely used in transition metal chemistry, because of their synthetic flexibility, strong metal binding properties, and their ability to impart properties like luminescence or spin-crossover onto a coordinated 15 metal ion. 2,2':6',2''-Terpyridine (terpy) and its derivatives are still the most widely used ligand of this type, and are important in supramolecular chemistry, 1 soft materials chemistry 2,3 and nanoscience 4 among other fields of research.…”

Synthesis, characterization and thermal properties of cobalt(II), nickel(II) and copper(II) complexes of 2,6-bis(3,4,5-trimethyl-N-pyrazolyl)pyridine): the crystal structure of [Co(btmpp)(H2O)2(NO3)]NO3

“…Papers dealing with the structures of mononuclear Co(II) complexes [5], the structures and electrochemical properties of Ni(II) dinuclear complexes [6], the structure and electrochemical properties of a Cu(II) nitrato complex [7], Ru(II) complex structures [8], and dye-sensitized solar cell efficiency using similar ligands have been published. Following our systematic study on the coordination chemistry of btmpp with transition metals [9,10], here we report the synthesis and structural characterization of new metal-coordination compounds with the pyrazole derivative ligand btmpp. A single crystal X-ray study was carried out for complex 1 which gave the most suitable crystals.…”