502467-17-6Relevant articles and documents
Stabilisation of copper(i) polypyridyl complexes toward aerobic oxidation by zinc(ii) in combination with acetate anions: a facile approach and its application in ascorbic acid sensing in aqueous solution
Suktanarak, Pattira,Ruangpornvisuti, Vithaya,Suksai, Chomchai,Tuntulani, Thawatchai,Leeladee, Pannee
, p. 997 - 1005 (2019)
A new and facile approach to stabilise copper(i) complexes in aqueous solution by the addition of zinc(ii) ions in combination with acetate ions (OAc?) was demonstrated. This stability enhancement toward the aerobic oxidation of copper(i) species was investigated by various techniques including UV-vis spectroscopy, 1H-NMR, FT-IR, and ESI-MS. Our experimental results together with DFT calculations led to a proposed structure of [(adpa)Cu-OAc-Zn(OAc)(H2O)2]+/2+. It was also postulated that zinc(ii) with its Lewis acidity may attract electrons from the Cu centre through the bridging ligands (OAc?), resulting in the lower reactivity of Cu(i) with O2. In addition, this strategy was shown to be applicable to ascorbic acid detection by monitoring a change in the redox states of copper complexes using fluorescence spectroscopy. Moreover, it was demonstrated that the method was sensitive and accurate for the quantitative analysis of ascorbic acid in vitamin C tablets.
Synthesis, structural and physicochemical properties of a series of manganese(II) complexes with a novel N5 tripodal-amidate ligand and their potential use as water oxidation catalysts
Gallos, John K.,Hadjithoma, Sofia,Kabanos, Themistoklis A.,Keramidas, Anastasios D.,Miras, Haralampos N.,Papanikolaou, Michael G.,Plakatouras, John C.
, (2021)
Water oxidation plays a crucial role in both natural and artificial photosynthesis, which is an attractive solution to the depletion of fossil fuels as energy sources due to the increasing consumption. Thus, the search for oxygen evolution reaction cataly
Dinuclear Spin-Crossover Complexes Based on Tetradentate and Bridging Cyanocarbanion Ligands
Milin, Eric,Bela?d, Sabrina,Patinec, Véronique,Triki, Smail,Chastanet, Guillaume,Marchivie, Mathieu
, p. 9038 - 9046 (2016/10/31)
Spin-crossover (SCO) Fe(II) dinuclear complexes of formula [Fe2(tmpa)2(μ2-tcpd)2]·0.8(CH3OH) (1·MeOH) and [Fe2(andmpa)2(μ2-tcpd)2]·2CH3OH (2·MeOH) (tmpa = tris(2-pyridylmethyl)amine, andmpa = bis(2-pyridylmethyl)aminomethyl)aniline, (tcpd)2- = 2-dicyanomethylene-1,1,3,3-tetracyanopropanediide) have been synthesized and characterized by infrared spectroscopy, X-ray diffraction, and magnetic measurements. The crystal structure determinations of the two complexes (1·MeOH and 2·MeOH) and the desolvated complex 1 (from 1·MeOH) revealed a neutral centrosymmetrical dinuclear structure in which the (tcpd)2- cyanocarbanion acts as a double μ2-bridging ligand between two [FeL]2+ (L = tmpa (1), andmpa (2)) units involving two free coordination sites in the cis configuration. Examination of the shortest intermolecular contacts in 1·MeOH and 1 reveals no significant hydrogen bonding between the dinuclear units, while in 2·MeOH these units are held together by significant hydrogen bonds between one of the uncoordinated nitrile groups and the anilate function, giving rise to 1D supramolecular structure. The three dinuclear complexes 1, 2·MeOH, and 2 exhibit SCO behaviors which have been evidenced by the thermal evolutions of the χmT product and by the average values of the six Fe-N distances for 1 and 2·MeOH, that reveal a gradual conversion with transition temperatures (T1/2) at ca. 352 K (1), 196 K (2), and 180 K (2·MeOH). For the solvated 1·MeOH, the sharp SCO transition observed around 365 K was induced by the desolvatation process above 330 K during the magnetic measurements.
ZP4, an improved neuronal Zn2+ sensor of the Zinpyr family
Burdette, Shawn C.,Frederickson, Christopher J.,Bu, Weiming,Lippard, Stephen J.
, p. 1778 - 1787 (2007/10/03)
A second-generation fluorescent sensor for Zn2+ from the Zinpyr family, ZP4, has been synthesized and characterized, ZP4 (Zinpyr-4, 9-(o-carboxyphenyl)-2-chloro-5-[2-{bis(2-pyridylmethyl)-aminomethyl}- N-methylaniline]-6-hydroxy-3-xanthanone) is prepared via a convergent synthetic strategy developed from previous studies with these compounds, ZP4, like its predecessors, has excitation and emission wavelengths in the visible range (～500 nm), a dissociation constant (Kd) for Zn2+ of less than 1 nM and a high quantum yields (Π = ～0.4), making it well suited for biological applications, A 5-fold fluorescent enhancement is observed under simulated physiological conditions corresponding to the binding of the Zn2+ cation to the sensor, which inhibits a photoinduced electron transfer (PET) quenching pathway. The metal-binding stereochemistry of ZP4 was evaluated through the synthesis and X-ray structural characterization of [M(BPAMP)(H2O)n]+ complexes, where BPAMP is [2-{bis(2-pyridylmethyl)aminomethyl}-N-methylaniline]-phenol and M = Mn2+, Zn2+ (n = 1) or Cu2+ (n = 0).
