Non-technical Abstract: Bismuth-containing heteroanionic materials are an emerging class of compounds that combine multiple types of negatively charged atoms (anions) within a single, overall neutral structure, enabling new and useful properties beyond those found in traditional single-anion materials (e.g. oxides or halides). These materials are especially exciting for their potential applications in solar energy, light-driven chemical reactions (photocatalysis), and light emission (photoluminescence). The lone pairs of the bismuth ions as well as the layered structures of many bismuth-containing heteroanionic materials drive their unique electronic properties. However, only a small number of possible combinations have been studied. To address this shortage, researchers in the Skrabalak and Georgescu groups, with support from the Solid State and Materials Chemistry program in NSF’s Division of Materials Research, are collaborating to design, synthesize, and understand new bismuth-containing heteroanionic materials by combining computational and experimental methods. Their research explores how the types and arrangements of anions within these materials impact their properties. This project also supports broader educational and community goals, including training students in multidisciplinary science and sharing discoveries with the public through outreach programs like Science Fest at Indiana University. Technical Abstract: This project, supported by the Solid State