Structures and photophysical properties of two luminescent bipyridine compounds: 2',6'-difluoro643-(pyridin-2-yloxy)phenyl]-2,3'-bipyridine and 2',6'-dimethoxy-6-13-(pyridin-2-yloxy)pheny11-2,3'-bipyridine

초록

The title compounds, C2iHi3F2N30 (1) and C23Hi9N303 (2), have been synthesized by typical cross -coupling reactions. Both compounds have been characterized by single -crystal X-ray diffraction. Bipyridine 1 exhibits a fully extended structure in which the terminal pyridine rings are oriented away from each other, while bipyridine 2 displays a bent structure in which terminal pyridine rings are oriented in the same direction. Several intermolecular interactions lead to the formation of two- and three-dimensional supramolecular networks in the crystal structures of 1 and 2, respectively. Compound 1 bears fluorine substituents and emits a strong fluorescence with)L, ax = 325 nm, while methoxy-substituted compound 2 displays red -shifted emissions with)L, ax = 366 nm. The emissions observed in both compounds originate from phenyl- and 2,31-bipyridine-based 7r r* transitions, according to theoretical calculations. Both compounds have high triplet energies (T1) ranging from 2.64 to 2.65 eV, which makes them potential host materials in organic light -emitting diodes (OLEDs).

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