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), M 1 , and {[3,5-(CF3)2Pz]M(2,4,6-collidine)}2, M 2 , respectively (M = Cu; Ag). The solids exhibit bright blue phosphorescence, at room temperature for the copper compounds and at 77 K for all compounds. Ag 1 , Cu 1 , and Cu 2 exhibit blue pyrazole-based structured emissions with short phosphorescence lifetimes, 101−102 μs, due to an internal heavy-metal effect. Meanwhile, Ag 2 exhibits curious multiple excitation-dependent emissions.