A heavy, electron-deficient thiol in which three bromine atoms withdraw electron density and raise the acidity of the –SH group (pKa ≈ 4.9), while simultaneously increasing molecular weight and density. The combination delivers unique reactivity and materials properties:
High-density thiol–ene networks: photopolymerisation with diallyl ethers yields halogen-rich films (ρ 2.1 g cm⁻³, n 1.73) that serve as X-ray-opaque coatings for dental prostheses and radiation-shielding varnishes.
Flame-retardant epoxy hardener: 5–10 wt % incorporation provides UL-94 V-0 rating without phosphorus or antimony, while maintaining Tg 155 °C and low smoke density (Ds 4 min <150).
Heavy-metal scavenger: the soft sulfur and vicinal bromines form a bidentate Br,S-binding pocket that selectively extracts Hg²⁺ (log K = 17.2) from acidic industrial brines, enabling resin-based columns that reduce mercury to <0.5 ppb.
Precursor to π-conjugated electrophiles: Pd-catalysed C–H olefination or Sonogashira coupling at the 2- or 4-position generates tribromovinyl-thioethers used as electron-acceptor blocks in n-type organic semiconductors (electron mobility 0.12 cm² V⁻¹ s⁻¹).
Phase-transfer bromination reagent: the S-H bond is readily oxidised to the corresponding disulfide, which in situ generates Br₂ for selective α-bromination of ketones under neutral, solvent-free conditions.
Store under nitrogen at 2–8 °C, protected from light and oxidants to avoid disulfide or poly-brominated by-product formation .
