This work offers a successful loop-closing strategy for increasing the sustainability and lowering the manufacturing cost of epoxy materials.

Squaramide-based tripodal anion receptors 1–3 have been prepared and their anion binding properties with various inorganic anions were investigated. Receptor 1 formed a dimeric complex in solid state and a 1 : 1 complex in solution with SO₄ ²⁻. All receptors 1–3 could selectively encapsulate SO₄ ²⁻via hydrogen bonds over other examined anions.