Abstract
The occurrence of concomitant polymorphism in 4′-(isoquinolyl)-2,2′:6′,2″-terpyridine, 1a and 1b (2-quinterpy) and conformational polymorphism in 4′-(4-quinolyl)-2,2′:6′,2″-terpyridine (4-quinterpy) has been identified to due to crystallization process and solvent, respectively. Crystallization of 2-quinterpy in acetone yielded the concomitant polymorphs 1a and 1b which crystallize in the monoclinic P21/c and the orthorhombic Pna21 space groups, respectively. The polymorph 2a was grown from bulk 4-quinterpy in dimethyl sulfoxide, crystallizes in the monoclinic P21/c space group, while 2b grown from acetonitrile or even acetone crystallizes in the monoclinic system but in P21/n space group.
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