Catalytic oxidation of ascorbic acid via copper–polypyridyl complex immobilized on glass

Abstract

A monolayer of redox-active copper–polypyridyl complexes on glass support was utilized for catalytic oxidation of ascorbic acid showing high performance.

A practical non-enzymatic urea sensor based on NiCo2O4 nanoneedles

“…1 In the human body, urea is formed exclusively in the liver, and it is transported by the bloodstream to the kidneys, where it is excreted into the urine, 2 as an end product of protein metabolism. 3 Several methods have been developed for the detection of small biomolecules using nanostructure materials [4][5][6] To date several analytical methods have been proposed for the determination of urea, such as high performance liquid chromatography (HPLC), 7,8 gas chromatography (GC) 9 , 14 N-NMR, 10 infrared (IR) spectrometry, 11,12 calorimetry, 13 uorimetry, 14 and chemiluminescence. 15 All these methods for the determination of urea are either costly or require expertise in handling the instruments and are not suitable for eld measurements.…”

Opto-Electroactive Amino- and Pyridyl-Terminated Monolayers of RuII–Terpyridyl Complexes and Their Usage as Hg2+ Sensors

“…Metal–polypyridyl complexes are potentially useful for a variety of photophysical, electrochemical, and spectro-electrochemical applications. − Particular beneficial aspects of these systems are their structural tunability and flexible choice of metal ions, which also affect the positions of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) states as well as the respective energy gap. , Accordingly, the solubility, stability, redox potential and kinetics, and optical characteristics of metal–polypyridyl complexes can be controlled and manipulated in a desired way. For these reasons, functional polypyridyl complexes have found great utility in the design of metallo-supramolecular architectures as well as active elements in photodynamic therapy, , catalysts, , sensing modules, , components of nonvolatile memory devices, , photochromic or electrochromic elements in solid-state devices, , and media for charge and spin transport. , Most of these applications rely on covalent or noncovalent assembly of polypyridyl complexes on suitably functionalized solid substrates, which provide aligned and densely packed nanometric architectures, with a much better control over molecular orientation, integrity, and functionality compared to the liquid media case. , Such molecular assemblies can also serve as a basis for creating application-oriented novel multifunctional materials and also act as a versatile tool box for discerning structure–property relationship, which is an essential requirement for modeling a variety of interfacial phenomena.…”

Silatranes for binding inorganic complexes to metal oxide surfaces

“…[1][2][3][4][5][6][7][8] Surfaces with immobilized inorganic compounds are of great importance for heterogeneous catalysis, especially for alternative energy applications where water oxidation and proton reduction catalysts are widely studied. 1,2,[4][5][6][7][9][10][11][12][13][14] A range of artificial photosynthetic devices operate in water. 9,[15][16][17][18] In addition, due to the varying pH stability profiles of components (catalysts, photosensitizers, electrodes, etc.)…”

“…4,17,19,20 Molecular precursors for surface-anchoring to metal oxides have been widely studied and include carboxylic acids, phosphonic acids, triethoxysilanes, acetylacetonate, hydroxamic acids, and silatranes. 1,[4][5][6][7]13,14,[21][22][23] Tripodal anchoring groups have been utilized due to their higher stability on surfaces. 2 Among water-stable anchoring groups, silatranes are of particular interest because they are non-protic, non-ionic, and form strong siloxane surface bonds to metal oxides.…”