Fig. 6: The typical morphologies of Asp2Cu and Asp crystals from their racemic solutions with or without additives.
From: Tuning organic crystal chirality by the molar masses of tailored polymeric additives
a The typical morphology of rac-Asp2Cu when no additive was added (insert picture: enlarged picture of the strands of wirelike crystals). b The typical morphology of D-Asp2Cu when 5 wt% L-PMAL was added into the solution of rac-Asp2Cu (insert picture: enlarged picture of the P-type helical crystal). c A P-type helical crystal of D-Asp2Cu composed of three strands of crystals (insert picture: enlarged picture of one strand of crystals, from which twisted alignment of wirelike crystals in right-handedness can been seen). d The typical morphology of rac-Asp when no additive was added (insert picture: enlarged picture of the granular crystals). e, f The typical morphologies of D-Asp when 1.5wt% L-PMAL (L-PMAL:rac-Asp, wt/wt) and 3 e.q. ammonium formate (NH4HCO2:rac-Asp, mol/mol) were added into the solution of rac-Asp. The red arrows show M-type helical sense.
