A novel coordination mode of κ¹-N-Br-pyridylbenz-(imida, oxa or othia)-zole to Pt(ii): synthesis, characterization, electrochemical and structural analysis

Abstract

Three novel platinum(ii) complexes with the general formula [trans-Pt(Br-PyBenz-X)(Cl)2(DMSO)] containing Br-pyridylbenz(imida, oxa or othia)zole derivatives, under an unusual N-κ1-coordination mode were synthesized.

A rollover Ir(iii) complex of 2-(6-bromopyridin-2-yl)imidazo[1,2-a]pyridine

“…As we mention, part of our research has been addressed to understand the unusual reactivity of pyridine with Ir( iii ) giving the NHC-complexes; 17,18 bromo-pyridin derivative toward Pd( ii ) and Pt( ii ) complexes, where the bromine atom at pyridine ring regulates the coordination mode behaviour on the formation of platinum pincer complexes, seven-membered and rollover palladacycles. 33–37…”

“…32 As we mention, part of our research has been addressed to understand the unusual reactivity of pyridine with Ir(III) giving the NHC-complexes; 17,18 bromo-pyridin derivative toward Pd(II) and Pt(II) complexes, where the bromine atom at pyridine ring regulates the coordination mode behaviour on the formation of platinum pincer complexes, seven-membered and rollover palladacycles. [33][34][35][36][37] Herein, we report the first rollover cyclometallation reaction into the new 2-(6-bromo-pyridin-2-yl)imidazo [1,2-a]pyridine type ligand prompted by IrCl 3 , under mild reaction conditions, using dimethylformamide (DMF) as a solvent at 70 1C for a week under air. Additionally, we performed DFT calculations to propose a reaction mechanism that sheds some light on the reaction order of this C-H bond activation in the presence of Br-pyridine group.…”