2,2′:6′,2′′‐Terpyridine Analogues: Structural, Electrochemical, and Photophysical Properties of 2,6‐Di(thiazol‐2‐yl)pyridine Derivatives

Abstract

Several 2,6‐di(thiazol‐2‐yl)pyridine (dtpy) derivatives substituted at the 4‐position were synthesized, and their structural, photophysical, and electrochemical properties were investigated. The studies proved the attractiveness of this new class of compound as building blocks for materials science, coordination chemistry, and supramolecular chemistry and also revealed the possible tuning of their thermal, photophysical, electrochemical, and electroluminescence properties through the modification of the structure of the substituent. The thermal, photophysical, and electrochemical behavior of the compounds was examined by differential scanning calorimetry (DSC) and for selected compounds by thermogravimetric analysis (TGA), UV/Vis spectroscopy, photoluminescence (PL) spectroscopy, and cyclic voltammetry (CV). Additionally, their selected properties were investigated theoretically by density functional theory (DFT) calculations. The electroluminescence abilities of the synthesized compounds were preliminary tested in host–guest light‐emitting diodes.

Anti‐proliferative and Apoptotic Effects of Coordination Compounds of Zinc(II), Palladium(II), and Platinum(II) with Tridentate 4‐(6‐hydroxyphenyl)‐2,6‐di(thiazol‐2‐yl)pyridine

“…A new absorption band at around 252 nm in the metal compounds is also observed. These absorption bands are generally attributed to the metal‐to‐ligand charge‐transfer transitions (MLCT) (Figure S7) [37,38] …”

“…These absorption bands are generally attributed to the metal-to-ligand charge-transfer transitions (MLCT) (Figure S7). [37,38]…”

Controlling of Photophysical Behavior of Rhenium(I) Complexes with 2,6-Di(thiazol-2-yl)pyridine-Based Ligands by Pendant π-Conjugated Aryl Groups

“…Transition metal complexes with 2,2′:6′,2′′-terpyridines and their structural analogues have recently received extensive attention due to their thermal stability, kinetic inertness, rich optical and electrochemical properties relevant for their potential applications as effective luminescent materials and promising anticancer agents [ 24 , 25 , 26 , 27 , 28 , 29 ]. The photoluminescence and biological features of these systems are generally fine-tuned by two approaches: (i) incorporation of appropriate substituents in the 4′-position of the central pyridine ring of 2,2′:6′,2′′-terpyridine [ 30 , 31 , 32 ], and (ii) substitution of peripheral pyridine rings of 2,2′:6′,2′′-terpyridine by other heterocycles [ 33 , 34 , 35 ]. Most importantly, the employment of a newly designed ligand translates to novel excited-state and physical properties of resulting transition metal complexes, and in consequence, new application potential in biology and optoelectronics.…”