A new kind of optical Mn(II) sensor with high selectivity: Melamine based poly(azomethine–urethane)

In this study a kind of poly(azomethine–urethane); toluene-2,4-diisocyanate-co-N,N′,N″,-tris[(2-hydroxynaphtyl)-1-methylene]-1,3,5-triazine-2,4,6-triamine (TDI-co-2-HNMTT) was prepared as in the literature and employed as a new fluorescent probe for the detection of Mn(II) concentration. The photoluminescence (PL) measurements were carried out in the presence of several kinds of heavy metals. TDI-co-2-HNMTT gave a linearly and highly selective response against Mn(II) as growing a new emission peak at 394 nm. Possible interferences of other ions were found too low. Detection limit of the sensor was found as 1.51 × 10−5 mol L−1. Resultantly, TDI-co-2-HNMTT could be effectively used as an optical Mn(II) sensor.