19229-79-9Relevant articles and documents
Establishment of the light-absorption ratio variation approach and application to determination of CO(II) in the ng ml-1 level and novel characterization of Co(II) and Zn(II) complexes with 1,5-di(2-hydroxy-5- sulfophenyl)-3-cyanoformazan
Gao, Hong-Wen,Wang, Hong-Yan,Zhang, Sheng-Yi,Zhao, Jian-Fu
, p. 1649 - 1656 (2003)
The light-absorption ratio variation approach (LARVA) has been established and applied to the determination of Co on the ng ml-1 level with 1, 5-di(2-hydroxy-5-sulfophenyl)-3-cyanoformazan (DSPCF) at pH 9.33. Competitive replacement complexatio
Digital logic circuit based on a single molecular system of salicylidene schiff base
Zhao, Liyan,Sui, Dan,Chai, Jia,Wang, Yue,Jiang, Shimei
, p. 24299 - 24304 (2006)
The salicylidene Schiff base N-3,5-dichloro-salicylidene-(S)-α- phenylethylamine (SPEA) has been synthesized and characterized. Stimulated by one optical input (UV light) and two chemical inputs (OH- and Zn 2+), SPEA undergoes reactions of photochemistry, deprotonation, and complexation. Tailing these reactions by means of the UV-vis absorption spectra and fluorescence spectra, two obvious optical outputs, an absorption band at 323 nm and a fluorescent emission peak at 460 nm, have been obtained. On the basis of encoding binary digits in these inputs and outputs applying positive logic conventions, one monomolecular circuit, which integrates one OR, two NOT, and four AND gates, has been achieved.
Stability of ZnO Particles in Aqueous Suspensions under UV Illumination
Domenech, J.,Prieto, A.
, p. 1123 - 1126 (1986)
The effect of UV illumination on the stability of ZnO particles in aqueous suspensions is investigated.The quantity of ZnO photodecomposed has been determined by measuring polarographically the resulting Zn(II) concentration in solution at different irrad
Enhanced photochromism of 1,2-dithienylcyclopentene complexes with metal ion
Qin, Bing,Yao, Rongxia,Zhao, Xueli,Tian, He
, p. 2187 - 2191 (2003)
A new bis(5-pyridyl-2-methylthien-3-yl)cyclopentene, as a photochromic bridging ligand, has been synthesized and the photocyclization quantum yield was found to increase in the presence of a metal ion.
Copper(II) Complexes of Substitued Macrobicyclic Hexaamines: Combined Trigonal and Tetragonal Distortions
Bernhardt, Paul V.,Bramley, Richard,Engelhardt, Lutz M.,Harrowfield, Jack M.,Hockless, David C. R.,et al.
, p. 3589 - 3599 (1995)
The hexaamine complexes [M{(NH3)2sar}](4+) and [M{(NMe3)2sar}](4+) (M =Cu(II), Zn(II); sar = 3,6,10,13,16,19-hexaazabicyclo[6.6.6]icosane) have been synthetized and characterized both spectroscopically and structurally. X-ray crystal structural analyses of [Cu{(NH3)2sar}](NO3)4*H2O (monoclinic, P21, a 12.311(3) ?, b 12.338(4) ?, c 8.574 ?, β 93.91(3)°, Z = 2), [Zn{(NH3)2sar}](NO3)4*H2O (monoclinic, P21,a 12.365(4) ?, b 12.396(7) ?, c 8.587(4) ?, β 94.13(3)°, Z = 2), [Cu{(NMe3)2sar}](ClO4)4 (hexagonal P6-2C, a 8.689(2) ?, c 27.927(2) ?, Z = 2), and [Zn{(NMe3)2sar}](ClO4)4 (hexagonal,P6-2C, a 8.669(5) ?, c 27.997 ?, Z = 2) are reported. Visible-near-infrared absorption, circular dichroism, magnetic circular dichroism, and electron paramagnetic resonance spectroscopic studies reveal distorted CuN6 chromophores. Trigonal distortions arise from steric requirements of the ligands, whereas tetragonal distortions result from Jahn-Teller coupling in the Cu(II) complexes. X-ray crystallographic studies of these copper(II) complexes revealed partially averaged ([Cu{(NH3)2sar}](4+)) and completely averaged ([Cu{(NMe3)2sar}](4+)) geometries as a result of both static disorder and dynamic processes throughout each lattice. Partial resolutions of [Cu{(NMe3)2sar}](4+) into its enantiomeric forms was achieved to give the first stable chiral molecule where Cu(II) is the stereogenic atom. In the absence of Jahn-Teller coupling characteristic of their Cu(II) relatives, the analogous Zn(II) complexes exhibited high-symmetry structures both in solution and in the solid state.
Substitution effects in the A- and B-rings of the chlorin macrocycle on demetalation properties of zinc chlorophyll derivatives
Hirai, Yuki,Sasaki, Shin-Ichi,Tamiaki, Hitoshi,Kashimura, Shigenori,Saga, Yoshitaka
, p. 3240 - 3244 (2011)
Effects of peripheral substituents in the A- and B-rings of the chlorin macrocycle on demetalation of zinc chlorophyll derivatives were examined. The demetalation rate constants of zinc 8-formyl-chlorin (1) were comparable to those of zinc 3-formyl-chlorin (2). Both 1 and 2 exhibited significantly slower demetalation kinetics than the corresponding zinc chlorin 3, which had no formyl group. Comparison of demetalation kinetics between zinc 3-ethyl-chlorin (3) and zinc 3-vinyl-chlorin (4) indicated that the substitution at the 3-position of the chlorin macrocycle from a vinyl to an ethyl group accelerated removal of the central zinc. Activation energies of demetalation of zinc chlorins 1, 2, and 5 possessing a formyl group in the A- or B-ring of the chlorin macrocycle were larger than those of zinc chlorins 3 and 4 lacking a formyl group. These results indicate that the formyl groups in the A- or B-ring provide tolerance to demetalation of chlorin molecules due to their electron-withdrawing effects.
Experimental and quantum-chemical studies of anabasine complexes with copper(II) and zinc(II) ions
Bregier-Jarz?bowska, Romualda,Malczewska-Jaskó?a, Karolina,Jankowski, Wojciech,Jasiewicz, Beata,Hoffmann, Marcin,G?sowska, Anna,Jastrz?b, Renata
, p. 841 - 848 (2015)
Anabasine copper(II) and zinc(II) complexes have been studied using experimental methods and quantum-chemical studies. Preferred coordination centers and possible structures of the complexes have been determined. It has been revealed, that the main coordi
Spiropyrans and spirooxazines: 11. Complexation of photochromic 5-(1,3-benzothiazol-2-yl)-substituted 1,3-dihydrospiro[benzo[f]chromene-3,2-indole] with metal ions
Rostovtseva,Chernyshev,Tkachev,Aldoshin,Voloshin,Metelitsa,Makarova,Minkin
, p. 677 - 682 (2015/11/27)
5-(1,3-Benzothiazol-2-yl)substituted 1,3-dihydrospiro[benzo[f]chromene-3,2-indole] forms intensely colored complexes with metal ions in acetone solution in the absence of irradiation. The composition and stability of the complexes were shown to depend on the nature of the metal ion. The molecular structure of the zinc complex was determined by X-ray diffraction. The complexes with diamagnetic ions display negative photochromism associated with their reversible dissociation induced by visible light.
DEVICES FOR TREATMENT OF SKIN DISORDERS
-
, (2011/06/25)
The present invention discloses a layer of fabrics having antibacterial/microbe-resistant properties that are designed for contacting with the human skin. The fabric layer can be disposed, directly or indirectly, onto a pillowcase, pillow, comforter, comforter cover, head support, bed cloth, sleeping bag, mattress, cushion, blanket, and garment.
Reactivity of metal oxides: Thermal and photochemical dissolution of MO and MFe2O4 (M=Ni, Co, Zn)
Garcia Rodenas, Luis A.,Blesa, Miguel A.,Morando, Pedro J.
, p. 2350 - 2358 (2009/05/30)
Dissolution rates of NiO, CoO, ZnO, α-Fe2O3 and the corresponding ferrites in 0.1 mol dm-3 oxalic acid at pH 3.5 were measured at 70 °C. The dissolution of simple oxides proceeds through the formation of surface metal oxalate complexes, followed by the transfer of surface complexes (rate-determining step). At constant pH, oxalate concentration and temperature, the trend in the first-order rate constant for the transfer of the surface complexes (kMe; Me=Ni, Co, Zn, Fe) parallels that of water exchange in the dissolved metal ions (k-w). Thus, the most important factor determining the rates of dissolution of metal oxides is the lability of Me-O bonds, which is in turn defined by the electronic structure of the metal ion and its charge/radius ratio. UV (384 nm) irradiation does not increase significantly the dissolution rates of NiO, CoO and ZnO, whereas hematite is highly sensitive to UV light. For ferrites, the reactivity order is ZnFe2O4>CoFe2O4?NiFe2O4. Dissolution is congruent, with rates intermediate between those of the constituent oxides, Fe2O3 and MO (M=Co, Ni, Zn), reflecting the behavior of very thin leached layers with little Zn and Co, but appreciable amounts of Ni. The more robust Ni2+ labilizes less the corresponding ferrite. The correlation between log kM and log k-w is somewhat blurred and displaced to lower kM values. Fe(II), either photogenerated or added as salt, enhances the rate of Fe(III) phase transfer. A simple reaction mechanism is used to interpret the data.
