A brightly emissive halomanganates(II) with triphenylphosphonium cation: Synthesis, luminescence, and up-conversion phenomena

A series of [HL](2)[MnX4] [X = I, Br, Cl] tetrahalomanganates with triphenylphosphonium cation has been designed and investigated in photophysics and EPR terms. At room temperature, the solid complexes exhibit a remarkably bright green phosphorescence (lambda(max) = 525 nm-555 nm) resulted from the Mn(II) d -d transitions (T-4(1) -> (6)A(1)) with high quantum efficiency (>50%) and a short lifetime of the iodomanganate complex (approximate to 41 mu s). Under infrared excitation (lambda(Ex) = 780 nm) the complexes exhibit unusually luminescence in the visible region (lambda(max) approximate to 500 nm). The EPR spectra of complexes are characterized by the deviation of the g-factor from the ge free electron value and by the high value of the zero-field splitting parameters on account of the spin-orbit coupling. The correlations between the luminescence and magnetic properties of the title complexes are discussed.

Automated summary

A series of [HL](2)[MnX4] [X = I, Br, Cl] tetrahalomanganates with triphenylphosphonium cation were designed and investigated in terms of photophysics and EPR. The solid complexes exhibited bright green phosphorescence at room temperature, with high quantum efficiency and a short lifetime. Under infrared excitation, the complexes showed unusual luminescence in the visible region.