MB-UiO-66-NH₂ Metal-Organic Framework as Chromogenic and Fluorogenic Sensor for Hydrazine Hydrate in Aqueous Solution

Abstract

Zirconium(IV)‐based MOFs UiO‐66‐NH2 and UiO‐66‐NH2 encapsulated with methylene blue (MB) MB‐UiO‐66‐NH2 were successfully prepared using a facile solvothermal method and were characterized by X‐ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), nitrogen physisorption analysis (BET), and X‐ray and photoelectron spectroscopy(XPS). Both the materials were 60–80 nm size and had large surface areas. MB‐UiO‐66‐NH2 appears to be a potential candidate for the sensing of hydrazine hydrate. Selective changes in both the chromogenic and fluorogenic characteristics of MB‐UiO‐66‐NH2 were observed upon treatment with hydrazine hydrate in an aqueous solution. The change in the photophysical properties of the MB‐UiO‐66‐NH2 was attributed to the selective conversion of methylene‐blue‐encapsulated UiO‐66‐NH2 to leucomethylene blue (LB) after the addition of hydrazine hydrate to the aqueous solution. The hydrazine hydrate detection limit for MB‐UiO‐66‐NH2 was found to be 0.012 ppm in the aqueous solution.

Autoxidation of 4-Hydrazinylquinolin-2(1H)-one; Synthesis of Pyridazino[4,3-c:5,6-c′]diquinoline-6,7(5H,8H)-diones

“…Wagnerova et al [ 34 ] have reported that cobalt-tetrasulphophthalocyanines enhance the autoxidation process of hydrazines [ 34 ]. On the other hand, Ichiro Okura et al [ 35 ] reported that the autoxidation of hydrazine occurred with manganese (III)-hematoporphyrin at room temperature, and that has an advantage because of its reactivity for the formation of oxygen coordinated Mn(III)-Hm peroxide adduct [ 36 ]. Andrew P. Hong et al [ 37 ] reported that satisfactory autoxidation of hydrazines occurred using cobalt (II) 4,4′,4″,4‴-tetrasulfophthalocyanine (CoIITSP).…”

Fluorescein Hydrazide-Appended Metal–Organic Framework as a Chromogenic and Fluorogenic Chemosensor for Mercury Ions

“…MOFs have been extensively used in dye adsorption due to their modifiable porous structure [33][34][35][36]. Furthermore, dye-incorporated MOFs have often been used for white light emission [37], the detection of nitro explosives [38], metal ions [39], organic molecules [40], photocatalysis [41], two-photon-pumped lasing [42], and solar cell manufacturing [43].…”

MOFs-Derived Nano-CuO Modified Electrode as a Sensor for Determination of Hydrazine Hydrate in Aqueous Medium

“…Electrochemical techniques offer portable, quick, and economical methodologies, which has attracted the attention of researchers [10]. As hydrazine has strong reducibility, it is easy to oxidize on the surface of electrodes, and the electrochemical determination of hydrazine hydrate has been proven to be a feasible detection method [11]. To improve the sensitivity and reproducibility of hydrazine's reaction on electrodes, some functionalized nanomaterials have been used for the construction of hydrazine hydrate chemical sensors [12][13][14][15][16][17].…”

“…[26][27][28][29][30]. Porous MOF-based sensors were also developed [11]. However, most MOFs are unstable in a water phase, so it is hard to apply them directly to electrochemical measurement in aqueous environment.…”