Research Project: İki Boyutlu Yarı-İletken Pniktojenler: Güneş Işığı Teşvikli Sürdürülebilir Organik Dönüşümler İçin Yeni Nesil Fotokatalizörler
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Contributors
Funders
ID
TB.00699
Authors
Metin, Önder
Faculty Member
Publications
Mesoporous black arsenic: Wet-chemical synthesis and its photo-enhanced activity in the C-H arylation of heteroarenes under red light illumination
(American Chemical Society, 2026) Eroğlu, Zafer; Özer, Melek Sermin; Sündü, Buse; Metin, Önder; Demircioğlu, Tuana Ayla; Canbulat, Zehra; Demircioğlu, Tuana Ayla; Sündü, Buse; Canbulat, Zehra; Demircioglu, Tuana Ayla; Eroglu, Zafer; Ozer, Melek Sermin; Sundu, Buse; Canbulat, Zehra; Metin, Onder; Department of Chemistry; KUYTAM (Koç University Surface Science and Technology Center); KUTTAM (Koç University Research Center for Translational Medicine); Yes; College of Sciences; Research Center
Black arsenic (b-As) is theoretically known for its anisotropic electronic and optical properties, yet its experimental realization remains limited. Here, we report the first bottom-up wet-chemical approach for the synthesis of mesoporous b-As (mb-As), a structurally ordered As-As networked semiconducting material. The as-synthesized mb-As exhibits a direct bandgap of 1.75 eV and a conduction band minimum of -1.40 V vs normal hydrogen electrode, providing a stronger reduction potential than most conventional semiconductors and enabling efficient visible-light-driven single-electron transfer (SET) under 625 nm illumination. These properties were leveraged in photoredox C-H arylation of heteroarenes, where mb-As catalyzed 13 transformations with yields up to 88%, successfully accommodating substrates bearing electron-donating and withdrawing groups as well as aromatic heterocycles. Mechanistic investigations revealed a radical-driven SET pathway involving both photogenerated electrons and holes of mb-As. Importantly, to address concerns regarding the potential toxicity of mb-As, biocompatibility assays performed on two different cell lines demonstrated that >90% cell viability up to 1 mg/L and ca. 70% cell viability at 50 mg/L, distinguishing mb-As from highly toxic arsenic analogues such as As(III) chloride and underscoring its suitability for sustainable catalysis and other possible applications.
