title: [5-Hydroxy-3-phenyl-1-(pyridin-2-yl)pyrazol-5-olato]diphenylboron.
abstract: In the title compound, C(26)H(20)BN(3)O, the B atom has tetra-hedral geometry and is linked to two phenyl rings, the O atom of the hy-droxy-pyrazole ring and the N atom of the pyridinyl ring. A six-membered BOCNCN ring forms by coordination of the B atom and the pyridinyl N atom. The BOCNCN ring has an envelope conformation [dihedral angle = 36.7 (1)° between the planar ring atoms and the flap] with the B atom out of the plane. In the 1-(2-pyridin-yl)-3-phenyl-5-hy-droxy-pyrazole group, the pyridinyl ring, the phenyl ring and the pyrazole ring are almost coplanar: the pyrazole ring makes a dihedral angle of 9.56 (8)° with the pyridinyl ring and 17.68 (7)° with the phenyl ring. The crystal structure is stabilized by π-π stacking inter-actions involving the pyridinyl and pyrazole rings of centrosymmetrically related mol-ecules, with ring centroid separations of 3.54 (5) Å.
authors.forename: Kee-In
authors.initials: KI
authors.lastname: Lee
authors.forename: Hye-Rin
authors.initials: HR
authors.lastname: Bin
authors.forename: Do-Min
authors.initials: DM
authors.lastname: Lee
authors.forename: Chong-Hyeak
authors.initials: CH
authors.lastname: Kim