Heteroleptic Cr 4+ molecular color center candidates

This is the authors' abstract. We don't add key points for this paper.

diamagnetic host (4') even displays optically resolvable spin sublevels under zero applied magnetic field; using variable-field PL spectroscopy, we optically determine its ZFS parameters. These results will lead toward the realization of well-defined spin-analyte interactions and subsequent spatial control of molecular color centers, wherein tunability is maintained through the donor at the axial coordination site.