1355450-12-2Relevant articles and documents
Zinc-specific fluorescent response of tris(isoquinolylmethyl)amines (isoTQAs)
Mikata, Yuji,Kawata, Keiko,Iwatsuki, Satoshi,Konno, Hideo
, p. 1859 - 1865 (2012)
Isoquinoline-based tetradentate ligands with C3-symmetry, tris(1- or 3-isoquinolylmethyl)amine (1- or 3-isoTQA), have been prepared and their zinc-induced fluorescence enhancement was investigated. Upon excitation at 324 nm, 1-isoTQA shows very weak fluorescence (β = ~0.003) in DMF/H2O (1/1) solution. In the presence of zinc ion, 1-isoTQA exhibits fluorescence increase (β = 0.041) at 359 and 470 nm. This fluorescence enhancement at 470 nm is specific for zinc. However, 3-isoTQA exhibited a smaller fluorescence enhancement upon zinc complexation (β = 0.017, λem = 360 and 464 nm) compared with 1-isoTQA. Crystal structures of zinc complexes of isoTQAs demonstrate the diminished steric crowding and shorter Zn-Naromatic distances compared with isoTQENs (N,N,N′,N′-tetrakis(isoquinolylmethyl)ethylenediamines) leads to a higher fluorescent response toward zinc relative to cadmium.