New complexes based on reduced Schiff base carboxylic acid ligand: Electric properties, fluorescence properties and detection of Fe3+

Abstract

Two kinds of complexes [M(L)(H2O)]n(1–3) [M = Cd(1), Co(2), Mn(3)] and {[Ln(L)(HL)]·(H2O)3}n (4–6) [Ln = Sm(4), Gd(5), Tm(6)] were dexterously constructed via reduced Schiff base carboxylic acid ligand (H2L=5-((4-(1H-imidazol-1-yl)benzyl)amino)isophthalic acid) under solvothermal reactions. Complexes 1–3 are two-dimensional (2D) framework consisted of binuclear [M2O10N2] building unit. Complexes 4–6 are three-dimensional (3D) network structure with ecu topological net. Importantly, with the 2D layered structure complex 3 as the electrode material for a supercapacitor has a maximum specific capacitance is 412.3 F·g−1 at a current density of 1 A·g−1, and even at 5 A·g−1, the specific capacitance retention is about 59.2 % of the initial capacitance. The electrochemical property ascribed attributed to the inherent properties of complex 3, including its layered structure and favorable exposed facets. Remarkably, the exploration of luminescence studies demonstrated that complex 1 has an outstanding capacity for detecting Fe3+ with excellent selectivity and sensitivity, where individual quenching efficiency Ksv (1.18 × 103 M−1) and detection limit (2.1 × 10−5 M) were regarded as the excellent coordination polymers sensors for detecting Fe3+.