Potassium trifluoro[(E)-2-phenyl-1-ethenyl]borate

In the title compound, K+·C8H7BF3−, the closest distance between the K+ and C8H7BF3− moieties is a K⋯F distance of 2.1619 (17) Å. The overall structure consists of two-dimensional sheets in which C8H7BF3− moieties coordinate to both sides of layers of K+ ions.