Aminoferrocene Derivatives in Chloride Recognition and Electrochemical Sensing

Synthesis and molecular structures of S-2-FcNHCOC6H4SH and [MIII(OEP)(S-2-FcNHCOC6H4)] (Fc = ferrocenyl, M = Fe, Ga): Electrochemical contributions of intramolecular SH⋯O C and NH⋯S hydrogen bonds

“…Ferrocene is the one of the most stable redox-active molecules and has been used for various applications including receptors or electrochemical sensing of small molecules [1][2][3][4][5][6]. In the recognition, intermolecular hydrogen bonds are formed resulting negative shift of the redox potential of metal center [2][3][4][5][6].…”

“…In the recognition, intermolecular hydrogen bonds are formed resulting negative shift of the redox potential of metal center [2][3][4][5][6].…”

The synthesis and recognition properties of colorimetric fluoride receptors bearing sulfonamide

“…The sulfonamide system of Crabtree and co-workers [9,10] have strong affinity to chloride anion because the coordination space of two -NH locating meta-site is fit for the size of chloride anion. While, the two -NH of our sulfonamide system is located ortho-site.…”

“…Shin-ichi et al [8] have reported that sulfonamide receptors exhibit large affinity constants for acetate and dihydrogen phosphate ions. Crabtree and co-workers [9,10] also studied that the sulfonamide system had strong affinity to chloride anion. However, the recognition properties of sulfonamide receptor that can be detected by naked eyes when they act with fluoride anion are few reported.…”

Electrochemical sensing of anions by redox-active receptors built on the ferrocenyl cyclam framework

“…Indeed, electrochemical anionic sensors containing the ferrocene entity as the signaling unit are of particular interest, since they offer the possibility to modulate the anion-receptor interactions according to the redox state, i.e., electrostatic interactions with the guest are switched-on upon oxidation of ferrocene to ferricinium. The driving force responsible for the anion binding ability of ferrocene-based hosts is usually H-bonding interactions between the guest anion and H-bond donor groups, such as amide [6,7] or urea [8] moieties incorporated into the receptor. The presence in the binding site of additional H-bond acceptor groups like amine [9], pyridine [7,10] or bipyridine [11] can enhance the interactions and the selectivity between the receptor and anionic species.…”