▎ 摘　　要

NOVELTY - Ferric ion sensing molecular material comprises e.g. benzene compound (I), naphthalene compound (II) and biphenyl compound (III) as base units and secondary units. The secondary units are many as ten substituent groups on the basic unit; there are at least two X-substituted-iminomethylphenol groups on the basic unit, the basic unit and the secondary unit form a macrocyclic ligand with at least 4 donor positions, and the macrocyclic ligand has metal ions particularly high affinity; ferric ions are chelated by this macrocyclic ligand to form tetradentate or hexadentate coordination chelates - two or more electron-rich oxygen atoms and two or more electron-rich nitrogen atoms as donor positions for two or more X-substituted-iminomethylphenol groups, provide electrons to the 4s4p34d2empty hybrid orbital of the central ferric metal ion, which greatly enhances selectivity and detection sensitivity of ferric ions. USE - The ferric ion sensing molecular material useful for: detection of ferric ions and quantitatively analyzing ferric ion concentrations; and in color spectrum (fluorescence spectrum, ultraviolet-visible light spectrum), quartz microbalance, electrode, electrochemistry, surface plasmon resonance and localized surface plasmon resonance (all claimed). ADVANTAGE - (I) has strong affinity and strong selectivity to trivalent iron ion. (I): has high affinity for the metal ion; and can be applied to the color spectrum, quartz microbalance, electrode, electrochemical, surface plasma resonance, local surface plasma, and/or biological solution. DETAILED DESCRIPTION - Ferric ion sensing molecular material comprises benzene compound of formula (I), naphthalene compound of formula (II) and biphenyl compound of formula (III) as base units and secondary units. The secondary units are many as ten substituent groups on the basic unit; there are at least two X-substituted-iminomethylphenol groups on the basic unit, the basic unit and the secondary unit form a macrocyclic ligand with at least 4 donor positions, and the macrocyclic ligand has metal ions particularly high affinity; ferric ions are chelated by this macrocyclic ligand to form tetradentate or hexadentate coordination chelates - two or more electron-rich oxygen atoms and two or more electron-rich nitrogen atoms as donor positions for two or more X-substituted-iminomethylphenol groups, provide electrons to the 4s4p34d2empty hybrid orbital of the central ferric metal ion, which greatly enhances selectivity and detection sensitivity of ferric ions; and X substituent group has regulatory function, which can adjust steric resistance, electron-withdrawing strength, electron-donating strength, additional donor positions, and the distance between two X-substituted-iminomethylphenol groups. R1= polymer or steric unit polymer; R2-R10= X-substituted-iminomethylphenol, -H, -CH3or -C2H5; and X = -H, -CH3, -C2H5, -C3H7, -C4H9, -C5H11, -C6H13, -C6H11, -F, -Cl, -Br, -I, -SO3H, -OH, -1°N, -2°N, -C=N-, -N=C-, -C(O)- or -C(O)O-. Provided that: at least two of R2-R10are X-substituted-iminomethylphenol. An INDEPENDENT CLAIM is also included for detection method of ferric ion sensing molecular material for iron ion species, comprising (i) adjusting pH of sample to 3.16, blowing air bubbles through sample for 30 minutes to oxidize all ferrous ions to ferric ions, detecting samples with ferric ion sensing molecular material to obtain the total iron ion concentration, (ii) blowing nitrogen gas bubble in the sample for 10 minutes to remove dissolved oxygen and prevent ferrous iron from being oxidized, then adjusting sample pH to 3.16, and detecting the sample using ferric ion sensing molecular material to obtain ferric ion concentration, and (iii) total iron ion concentration in the first step minus the ferric ion concentration in the second step is the ferric ion concentration.