Influence of the substituent D/A at the 1,2,3-triazole ring on novel terpyridine derivatives: synthesis and properties

Abstract

In this study, we newly designed and developed a synthesis route based on the 1,3-dipolar cycloaddition of the derivatives of 4 0 -(1,2,3-triazol-4-yl)phenyl-2,2 0 :6 0 ,2 00 -terpyridine with various (hetero)aryl substituents, differing in electronic character, on a triazol ring. The obtained compounds were comprehensively characterized by UV-Vis spectroscopy and electrochemical and thermal studies. Moreover, preliminary biological tests were conducted. The investigation allowed the selection of materials with the most promising properties with particular emphasis on the nature of the substituents. In addition, theoretical studies (DFT and TD-DFT) were performed to verify the comprehensive understanding of experimental results. Scheme 1 Synthesis of the compounds 1-3. Reagents and conditions: (a) NaN 3 , HMPA, room temp., and 72 h; (b) ethynyl-derivative of A, CuSO 4 $5H 2 O, sodium ascorbate, pyridine, EtOH, H 2 O, room temp., and 24 h; and (c) 2-acetylpyridine, KOH, NH 3aq , EtOH, room temp., and 24 h. Scheme 2 Synthesis of the compounds 4 and 3. Reagents and conditions: (a) 2-acetylpyridine, KOH, NH 3aq , EtOH, room temp., and 24 h and (b) ethynyl derivative of A, CuSO 4 $5H 2 O, sodium ascorbate, pyridine, EtOH, H 2 O, room temp., and 24 h. This journal is

Unadorned Molecular Engineering of Phenoxazine-Core-Based Hole-Transport Materials for Sustainable Perovskite Solar Cells

“…Interestingly, HTM3 showed a significant red shift due to the presence of substituted chromophores (−OCH 3 ), increasing the number of methoxy groups that ascribe toward longer wavelengths. These chromophores, which are linked to auxochromes (phenyl ring), help to extend the conjugation by sharing a nonbonding pair of electrons responsible for the bathochromic shift (redshift) …”