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Here, we reported the synthesis of an -phenylene bridged cyclic tetra(benzo[][1,2,5]thiadiazole) () by stepwise Suzuki-Miyaura couplings. Subsequent oxidation of yielded a two-sided fused product , identified as an -phenylene bridged cyclic triphenyleno[1,2-:7,8-']bis([1,2,5]thiadiazole) dimer. The structures of and were confirmed by high-resolution mass spectroscopies (HRMS) and NMR techniques. Their photophysical and electrochemical properties were fully characterized by ultraviolet-visible (UV-vis), fluorescence spectroscopy, cyclic voltammetry, and density functional theory (DFT) calculations.
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http://dx.doi.org/10.1021/acs.joc.5c00373 | DOI Listing |
Phys Chem Chem Phys
September 2025
Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Shantou 515063, P. R. China.
The photophysical properties of two new Bodipy dimers are investigated using a variety of techniques, including steady-state UV-vis absorption and fluorescence spectroscopy, femtosecond and nanosecond transient absorption spectroscopy, and pulse laser-excited time-resolved electron paramagnetic resonance (TREPR) spectroscopic methods. The dimers are formed by the Bodipy units rigidly linked by the orthogonal phenylene bridge. One of the dimers is composed of iodinated units, and the other is not.
View Article and Find Full Text PDFAdv Mater
August 2025
Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, P. R. China.
Near-infrared-II (NIR-II) fluorescence imaging has transformed biomedical imaging by providing low autofluorescence, deep tissue penetration, and superior spatial resolution, essential for precise in vivo biological visualization. However, developing NIR-II-emitting molecular fluorophores with high brightness remains challenging due to the difficulty in simultaneously achieving high absorption coefficients and excellent fluorescence emission in aggregated states. This study addresses these challenges at both the molecular and aggregate levels through a series of donor-acceptor-donor (D-A-D) configured small molecules.
View Article and Find Full Text PDFJ Am Chem Soc
August 2025
Philipps-Universität Marburg, Fachbereich Chemie, Hans-Meerwein-Str. 4, 35032 Marburg, Germany.
Cycloparaphenylenes (CPPs), hoop-shaped conjugated macrocycles composed of -linked phenyl units, have attracted significant interest due to their curved aromatic frameworks and -conjugation, which give rise to unique (opto)electronic properties. Full planarization of their π-systems is structurally inaccessible, as it would further increase the inherent ring strain. However, partial planarization can be achieved by π-extension through incorporation of rigid bending units.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
July 2025
Department of Chemistry, Rice University, 6100 Main St., Houston, Texas, 77005, USA.
We report a series of shape-persistent molecular nanotubes with top rim connectivity traversing from an all-meta- (m) to an all-para-phenylene (p) bridged species, including all possible members in between them. Single-crystal X-ray diffraction (SCXRD) and microcrystal electron diffraction (MicroED) data show a large torsional angle for meta-phenylenes relative to para-phenylene rings. Density functional theory (DFT) calculations reproduce the experimental torsional angles and also establish a correlation indicating a gradual increase in strain energy from m (∼31 kcal mol) to p (∼90 kcal mol).
View Article and Find Full Text PDFJ Am Chem Soc
August 2025
Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States.
The structural and photophysical properties of five chiral Zn complexes incorporating a carbazolate (Cz) donor that is electronically decoupled from a pyridyl acceptor by an -connection to a bridging phenylene group are presented. The bidentate ligand in the unsubstituted bis-ligated parent complex was methylated at key positions to constrain the torsional freedom of the donor/acceptor moieties, resulting in three structurally modified bis-ligated derivatives, all exhibiting energy gaps between the singlet and triplet excited states (Δ) between 22 and 27 meV. Methylation improves the photoluminescence quantum yield (up to 30% in solution), while the low Δ of these complexes allows for dual-emission properties in all of the bis-ligated derivatives.
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