Blue Phosphors of Dinuclear and Mononuclear Copper(I) and Silver(I) Complexes of 3,5-Bis(trifluoromethyl)pyrazolate and the Related Bis(pyrazolyl)borate

The synthesis, structure, and photoluminescence properties are
described for the three-coordinate mononuclear and dinuclear
complexes [H2B(3,5-(CF3)2Pz)2]M(2,4,6-collidine), M1, and {[3,5-(CF3)2Pz]M(2,4,6-collidine)}2, M2, respectively (M = Cu; Ag). The
solids exhibit bright blue phosphorescence, at room temperature
for the copper compounds and at 77 K for all compounds. Ag1,
Cu1, and Cu2 exhibit blue pyrazole-based structured emissions
with short phosphorescence lifetimes, 101−102 μs, due to an
internal heavy-metal effect. Meanwhile, Ag2 exhibits curious multiple
excitation-dependent emissions.