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(A) Precursors reported by Yan et al.30 and Sun et al.31 for the preparation of metallacycles. Schematic illustration of the formation of various nanostructures by (B) 35 and 36 and (C) 37D/37L and 38D/38L depending upon concentration. Panel B Adapted with permission from ref 30. Copyright 2013 American Chemical Society. Panel C Adapted with permission from ref 31. Copyright 2017 American Chemical Society.
