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oai:figshare.com:article/33986425 2026-09-24T15:21:08Z category_1 category_4 category_915 category_7 category_12 category_19 category_21 category_873 category_106 category_133 portal_63 item_type_3 month_year_09_2026

Enhanced Luminescence of a σ–π-Conjugated Disilane-Bridged Donor–Acceptor Macrocycle through Conformational Restriction Toyotaka Nakae (1663519) Yoshinori Yamanoi (1682557) Biophysics Biochemistry Physical Sciences not elsewhere classified Medicine Cell Biology Pharmacology Biotechnology Chemical Sciences not elsewhere classified Science Policy Plant Biology three heteroaromatic rings structurally restricted macrocycle photoluminescence quantum yield thpz </ b bridged trimeric thiophenophane conformational restriction disilane f </ sub 2 </ sub σ – π type electronic interactions donor – acceptor adjacent π l </ c </ electronic structure acceptor ). type disilane wavelength emission useful class thienopyrazine unit substantially higher results demonstrate previously reported nonradiative decay mainly attributed macrocyclic framework luminescence properties enhancing luminescence enhanced luminescence effective strategy crystalline state crystal x conjugated systems bridged luminophores bridged arenes 02 ). Disilane-bridged arenes are a useful class of σ–π-conjugated molecules in which Si–Si σ bonds interact with adjacent π-conjugated systems. We previously reported a linear D–A–D-type disilane-bridged aromatic molecule containing a thienopyrazine unit, l-Th2Thpz, which exhibited long-wavelength emission in solution (D: donor and A: acceptor). Herein, we designed and synthesized a disilane-bridged trimeric thiophenophane, c-Th2Thpz, to investigate how macrocyclization affects the electronic structure and luminescence properties of disilane-bridged D–A–D molecules. Single-crystal X-ray diffraction analysis revealed that c-Th2Thpz possesses a cyclic trimeric structure composed of three heteroaromatic rings and three Si–Si bonds. c-Th2Thpz exhibited an enhanced photoluminescence quantum yield compared with the linear analogue l-Th2Thpz, indicating that donor–acceptor-type electronic interactions through the disilane bridges are retained in the macrocyclic framework. Notably, the photoluminescence quantum yield of c-Th2Thpz increased from 0.09 in CH2Cl2 to 0.24 in the crystalline state, which is substantially higher than that of the linear analogue l-Th2Thpz in CH2Cl2 (ΦF = 0.02). This enhancement is mainly attributed to suppression of nonradiative decay in the structurally restricted macrocycle and in the crystalline state. These results demonstrate that macrocyclization is an effective strategy for enhancing luminescence while maintaining σ–π-conjugation-mediated D–A interactions in disilane-bridged luminophores. 2026-09-24T00:00:00Z Dataset Dataset 10.1021/acsaom.6c00464.s002 https://figshare.com/articles/dataset/Enhanced_Luminescence_of_a_-Conjugated_Disilane-Bridged_Donor_Acceptor_Macrocycle_through_Conformational_Restriction/33986425 CC BY-NC 4.0