Theory-Guided Discovery of Ion-Exchanged Poly(heptazine imide) Photocatalysts Using First-Principles Many-Body Perturbation Theory - Zahra Hajiahmadi; Anna Lo Presti; S. Shahab Naghavi; Markus Antonietti; Christian Mark Pelicano; Thomas D. Kühne (Journal of the American Chemical Society, 2026)