Deciphering the donor-acceptor order: impact of acceptor positioning on the optical properties of anthraquinone-carbazole-cyanostilbenes.

ABSTRACT: We report a systematic investigation of anthraquinone-carbazole-cyanostilbene conjugates arranged in two distinct connectivity patterns: AQCZCS and CZCSAQ. Despite having identical donor and acceptor units, subtle differences in donor-acceptor ordering profoundly impact their optical and excited-state properties. Both isomers exhibit broad, structureless emission characteristic of charge-transfer (CT) states, with maxima at 635 nm (AQCZCS) and 700 nm (CZCSAQ), corresponding to a pronounced bathochromic shift (Δλ ∼65 nm). Solution-phase emission reflects connectivity-dependent shifts, confirming strong donor-acceptor communication. In the solid state, AQCZCS emits vivid orangish red (610 nm) that shifts to deep red (645 nm) upon mechanical stimulation, while CZCSAQ shows red emission

SUBMITTER: Afrin A 

PROVIDER: S-EPMC12706843 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature