Yepeng Yang, Zilong Kong, Yulu Li, Tingting Wang, Hang Li, Xiaocun Zhang, Hanxiang Yan, Kong Liu, Rao Tao
Three Mn(II) complexes, [R-BPP]2[MnCl4] (BPP = benzyl(triphenyl)phosphonium, R = H, Me, CN), consisting of quaternary phosphonium cations and tetrachloromanganate(II) anions, were synthesized. They exhibit red-shifted emission (508 → 521 nm) via substituent effects. Encapsulation of [CN-BPP]2[MnCl4] within UV-curable acrylate produces stable films with tamper-evident security features under UV light, retaining structural integrity for more than 90 days.