via metalation chemistry, showing strongly red shifted spectral
features as a result. Further studies expanding the palette of
benzothiazine-based fluorophores and their application are in
progress and will be reported in due course.
This work was supported by the National Science Foundation
to whom we are grateful. We thank Professor Timothy E. Glass
and his coworkers Mr. Zhang Shaohui and Mr. Kenneth Hetti for
assistance with obtaining fluorescence data.
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