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Systems Based on AlP
Published in Vasyl Tomashyk, Multinary Alloys Based on III-V Semiconductors, 2018
The CuAl6(PO4)4(OH)8·4H2O (mineral turquoise), Cu3Al4(PO4)2(OH)12·2H2O (mineral sieleckiite) and Cu3Al4(PO4)3(OH)9·4H2O (mineral zapatalite) quinary compounds are formed in the Al–H–Cu–O–P system. First of them crystallizes in the triclinic structure with the lattice parameters a = 741.0 ± 0.1, b = 763.3 ± 0.1, c = 990.4 ± 0.1 pm and α = 68.42 ± 0.01°, β = 69.65 ± 0.01°, γ = 65.05 ± 0.01° and calculated density of 2.935 g cm−3 (Kolitsch and Giester 2000) [a:b:c = 0.7910:1:0.6051 and α = 92°58′, β = 93°30′, γ = 107°41′ and an experimental density of 2.84 g cm−3 (Schaller 1912); a = 742.4 ± 0.4, b = 762.9 ± 0.3, c = 991.0 ± 0.4 pm and α = 68.61 ± 0.03°, β = 69.71 ± 0.04°, γ = 65.08 ± 0.03° and the calculated and experimental densities of 2.90 and 2.84 g cm−3, respectively (Cid-Dresdner 1964, 1965; Cid-Dresdner and Villarroel 1972)]. Complete solid solution exists between turquoise and Al6(PO4)2(PO3OH)2(OH)8·4H2O (mineral planerite) (Foord and Taggart, 1998).
Proso millet peroxidase-mediated degradation and detoxification of Rhodamine B in water
Published in Environmental Technology, 2023
Jiao Li, Wenyan Li, Jianjian Hu, Chen Li, Xiaodong Cui
Optimum reaction pH: pH is another important factor affecting enzyme-catalyzed reactions because pH affects ionization of the amino acid side chains in the active site of the enzyme, and it may also alter the ionization state of the substrate. Our study showed that PmPOD had higher degradation activity under acidic conditions (Figure 4). While keeping the other parameters constant, the optimum reaction pH values of PmPOD-mediated BPA, RhB, and SD degradation were 5, 5, and 6.5, respectively (Figure 4). Unlike temperature, the optimum reaction pH varies greatly among different PODs. For example, the maximum degradation rates of triclosan, phenols, orange II and acid orange by HRP were observed between pH 5–9 [28–31]. The maximum degradation rates of Remazol Turquoise Blue G 133, Trypan Blue, Amido Black and Crystal Ponceau 6R dyes by SBP were observed between pH 3–4 [32–35]. CPO-mediated degradation of Orange G, Alizarin Red, Thioflavin T, Crystal violet and Sunset Yellow peaked between pH 2–3 [36,37].
Pyridyl-imidazole copper compounds
Published in Journal of Coordination Chemistry, 2023
Alma Araujo Martinez, Christopher P. Landee, Diane A. Dickie, Jan L. Wikaira, Fan Xiao, Mark M. Turnbull
[Dichlorido-(4-(2′-pyridyl)imidazole)-copper(II)] (1). 4-Pyim (0.178 g, 1.16 mmol) was dissolved in water (20 mL), giving a yellow turbid mixture, and the traces of insoluble material were removed through gravity filtration. HCl (0.75 M, 1 mL) was added dropwise to the solution until it reached pH 5. Copper chloride dihydrate (0.180 g, 1.05 mmol) was dissolved separately in water (10 mL), giving a turquoise solution. It was added to the 4-pyim solution, giving a dark green color. A saturated, aqueous, sodium chloride solution (1.835 g, 6 mL) was added to the mixture, and within approximately 10 min, small green crystals started forming. The reaction mixture was partially covered and left at room temperature for slow evaporation. The next day, dark green crystals were recovered through vacuum filtration, washed with water, and allowed to air dry (yield: 0.118 g 1, 40% based on copper chloride dihydrate). CHN (%) calculated (found): C: 34.36 (34.00), H: 2.52 (2.43), N: 15.03 (14.59). IR (m, cm−1): 3185 m (broad), 1615 m, 1584 w, 1566 w, 1498 w, 1464 w, 1432 w, 1326 w, 1285 w, 1210 w, 1148 w, 1102 w, 1068 w, 1047 w, 1014 w, 978 w, 808 m, 764 m, 678 m, 643 w, 616 m.
Synthesis and electronic structure of a series of first-row transition-metal pyrazine(diimine) complexes in two oxidation states
Published in Journal of Coordination Chemistry, 2022
Daniela Sanchez Arana, Jaylan R. Billups, Bruno Donnadieu, Sidney E. Creutz
A solution of the PzDI ligand (1.95 g, 3.8 mmol) was dissolved in THF and cooled to −40 °C, and to the vial was slowly added a cooled suspension of FeBr2 (0.82 g, 3.8 mmol) in anhydrous THF. After the addition was complete, the reaction was stirred at room temperature overnight. The resulting green precipitate was isolated on a glass frit, washed with THF, and dried in vacuo, giving 2.7 g (99%) of 1 as a turquoise solid. 1H NMR (300 MHz, (C6D6, 295 K) δH 48.13, 17.35, 3.59, 1.45, −12.12, −51.19 ppm. µeff (Evans method, CD2Cl2, 295 K): 4.6 µB. Elemental Analysis Calcd for C35H48Br2Cl2FeN4: C, 51.81; H, 5.96; N, 6.91. Found: C, 52.27; H, 6.08; N, 6.80.