Exploiting exciton coupling of ligand radical intervalence charge transfer transitions to tune NIR absorption† †Electronic supplementary information (ESI) available: Full synthetic details, DPV data, supplementary EPR data, full UV-vis-NIR spectra for [2˙˙]2+, [4˙˙]2+, and [5˙˙]2+, 195 K UV-vis-NIR

We detail the rational design of a series of bimetallic bis-ligand radical Ni salen complexes in which the relative orientation of the ligand radical chromophores provides a mechanism to tune the energy of intense intervalence charge transfer (IVCT) bands in the near infrared (NIR) region.

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