Ru(II) bipyridine complexes with acetylpyridine analogues spectral and electrochemical characterization

Abstract

The versatile chemistry of ruthenium complexes involves thousands of compounds aimed for different applications related to e.g. homogenous catalysis, cancer therapy, tumor diagnosis, and advanced materials.1 Thus, the synthesis and full (electro)chemical characterization of three new Ru(II) complexes carrying acetylpyridine (acpy) ligand unitis is described. The complexes were obtained via reaction of three ligand equivalents (2-, 3-, and 4-acpy) with an equimolar amount of metal precursor, [RuCl2(bpy)2] in methanol. After the overnight reflux, the reaction mixture was left to cool when equimolar amount of NH4PF6 was added. The products were isolated in a form of dark red powder. The complexes were characterized by IR, NMR and MS revealing bidentate coordination of 2- acpy and monodentate binding of 3- and 4-acpy. Their electrochemical profile was studied by cyclic voltammetry which confirmed rich redox chemistry.

Raznovrsna hemija kompleksa rutenijuma obuhvata hiljade jedinjenja namenjenih za različite primene, npr. homogenu katalizu, terapiju kancera, dijagnozu tumora i moderne materijale.1 S tim u vezi se opisuje sinteza i kompletna (elektro)hemijska karakterizacija tri nova Ru(II) kompleksa sa acetilpiridinskim ligandom (acpy). Kompleksi su dobijeni reakcijom tri ekvivalenta liganda (2-, 3-, i 4-acpy) sa ekvimolarnom količinom prekursora metala, [RuCl2(bpy)2] u metanolu. Nakon refluksa preko noći, reakciona smeša je ostavljena da se ohladi kad je dodata ekvimolarna količina NH4PF6. Produkti su izolovani u obliku tamnocrvenog praha. Kompleksi su okarakterisani IC, NMR i MS pokazujući bidentatnu koordinaciju 2-acpy i monodentatno vezivanje 3- i 4-acpy. Njihov elektrohemijski profil je ispitan cikličnom voltametrijom koja je potvrdila bogatu redoks hemiju.