This National Science Foundation award under the Mathematical and Physical Sciences program (CFDA 47.049) provides $313,276 to the University of Wisconsin-Eau Claire to study how the structures of certain stable molecules change when associated in molecular complexes. Principal Investigator James Phillips and undergraduate researchers will characterize complexes expected to undergo structural changes in cryogenic matrix environments near absolute zero. They will probe resonant frequencies using matrix infrared and ultraviolet spectroscopy to observe systematic shifts from structural changes. Computational bonding simulations will explore underlying factors driving unusual changes. This combined experimental and computational investigation aims to refine understanding of coordinate bond strength factors, with potential impacts across chemistry. Knowledge gained will contribute to fundamental chemical bonding comprehension to help predict reactivity. The award also supports transformative research, mentoring and career development experiences for undergraduates at the accessible comprehensive university.