Palladium-Iminodiacetic Acid Immobilized on pH-Responsive Polymeric Microspheres: Efficient Quasi-Homogeneous Catalyst for Suzuki and Heck Reactions in Aqueous Solution

2008 ◽  
Vol 350 (13) ◽  
pp. 2065-2076 ◽  
Author(s):  
Jianzheng Zhang ◽  
Wangqing Zhang ◽  
Yao Wang ◽  
Minchao Zhang
Keyword(s):  
Aqueous Solution ◽  
Iminodiacetic Acid ◽  
Homogeneous Catalyst ◽  
Ph Responsive ◽  
Heck Reactions ◽  
Polymeric Microspheres

scholarly journals pH-Responsive Hollow Polymeric Microspheres from Irradiated Cyclic Ether Aqueous Solution

2021 ◽  
Vol 11 (18) ◽  
pp. 8652
Author(s):  
Chuhong Yu ◽  
Jing Peng ◽  
Jiuqiang Li ◽  
Maolin Zhai
Keyword(s):  
Aqueous Solution ◽  
Laser Scanning ◽  
Average Diameter ◽  
Cyclic Ether ◽  
Oil Field ◽  
Hollow Microspheres ◽  
Confocal Laser ◽  
Ph Responsive ◽  
Polymeric Microspheres ◽  
Wide Range

Smart hollow polymeric microspheres have been widely applied in various fields such as controlled release, drug delivery, catalysis, and so on. Herein, a facile, green and one-step template-free method is introduced for preparing pH-responsive hollow polymeric microspheres via gamma irradiation of cyclic ether aqueous solution. The hollow polymeric microspheres are synthesized by radiation-induced polymerization and following the self-assembly and self-organization of amphiphilic polymer with cyclic ethers as monomers in water. SEM, TEM, micro-FTIR, and NMR confirmed the morphology and structures of the resultant microspheres. The confocal laser scanning microscope was used to investigate the stimuli-responsiveness and release behavior of hollow microspheres using 1-pyrene carboxaldehyde as a hydrophobic molecule model. The well-defined hollow polymeric microspheres with an average diameter of ca. 2.6 μm or 1.6 μm were prepared directly from dicyclohexal-18-crown-6 or tetraphydropyrane aqueous solution, respectively. The prepared hollow microspheres exhibit obvious pH stimuli-responsiveness and can release the encapsulated hydrophobic molecules when pH is higher than 5.0. Moreover, the reversible morphology transition between hollow microspheres and micelles makes the prepared hollow polymeric microspheres potentially suitable for a wide range of applications, including removal of dyes, oil field engineering, and biomedical fields.

Ferricyanide Oxidation of Butanol Homogeneously Catalysed by Chlororuthenium Complexes

1979 ◽  
Vol 32 (9) ◽  
pp. 1905 ◽  
Author(s):  
AF Godfrey ◽  
JK Beattie
Keyword(s):  
Aqueous Solution ◽  
Complex Formation ◽  
Linear Dependence ◽  
Rate Constants ◽  
Homogeneous Catalyst ◽  
Basic Solution ◽  
Rate Law ◽  
Kinetics Of ◽  
Solution Estimates ◽  
Butanol Concentration

The oxidation of butan-1-ol by ferricyanide ion in alkaline aqueous solution is catalysed by solutions of ruthenium trichloride hydrate. The kinetics of the reaction has been reinvestigated and the data are consistent with the rate law -d[FeIII]/dt = [Ru](2k1k2 [BuOH] [FeIII])/(2k1 [BuOH]+k2 [FeIII]) This rate law is interpreted by a mechanism involving oxidation of butanol by the catalyst (k1) followed by reoxidation of the catalyst by ferricyanide (k2). The non-linear dependence of the rate on the butanol concentration is ascribed to the rate-determining, butanol-independent reoxidation of the catalyst, rather than to the saturation of complex formation between butanol and the catalyst as previously claimed. Absolute values of the rate constants could not be determined, because some of the ruthenium precipitates from basic solution. With K3RuCl6 as the source of a homogeneous catalyst solution, estimates were obtained at 30�0�C of k1 = 191. mol-1 s-1 and k2 = 1�4 × 103 l. mol-1 s-1.

Structural Properties of Micelles Formed by Telechelic Pentablock Quaterpolymers with pH-Responsive Midblocks and Thermoresponsive End Blocks in Aqueous Solution

2019 ◽  
Vol 52 (24) ◽  
pp. 9746-9758 ◽  
Author(s):  
Florian A. Jung ◽  
Panayiota A. Panteli ◽  
Chia-Hsin Ko ◽  
Jia-Jhen Kang ◽  
Lester C. Barnsley ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Structural Properties ◽  
Ph Responsive

Fe3O4 and iminodiacetic acid modified peanut husk as a novel adsorbent for the uptake of Cu (II) and Pb (II) in aqueous solution: Characterization, equilibrium and kinetic study

2021 ◽  
Vol 268 ◽  
pp. 115729
Author(s):  
Aaron Albert Aryee ◽  
Farid Mzee Mpatani ◽  
Yangyang Du ◽  
Alexander Nti Kani ◽  
Evans Dovi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Kinetic Study ◽  
Iminodiacetic Acid

Effect ofl-Leucine Graft Content on Aqueous Solution Behavior and Membrane-Lytic Activity of a pH-Responsive Pseudopeptide

2009 ◽  
Vol 10 (9) ◽  
pp. 2601-2608 ◽  
Author(s):  
Rongjun Chen ◽  
Sariah Khormaee ◽  
Mark E. Eccleston ◽  
Nigel K. H. Slater
Keyword(s):  
Aqueous Solution ◽  
Lytic Activity ◽  
Ph Responsive ◽  
Solution Behavior

scholarly journals pH-Responsive, TiO2-Attached Porphyrin for Singlet Oxygen Production in an Aqueous Solution

2009 ◽  
Vol 1 (8) ◽  
pp. 1778-1784 ◽  
Author(s):  
Wenbing Li ◽  
Naveen Gandra ◽  
Erick D. Ellis ◽  
Shavelle Courtney ◽  
Shufang Li ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Singlet Oxygen ◽  
Oxygen Production ◽  
Ph Responsive

Aqueous Solution Properties of pH-Responsive AB Diblock Acrylamido Copolymers Synthesized via Aqueous RAFT†

2003 ◽  
Vol 36 (16) ◽  
pp. 5982-5987 ◽  
Author(s):  
Brent S. Sumerlin ◽  
Andrew B. Lowe ◽  
David B. Thomas ◽  
Charles L. McCormick
Keyword(s):  
Aqueous Solution ◽  
Solution Properties ◽  
Ph Responsive

A 1,8-naphthalimide-based fluorescent sensor with high selectivity and sensitivity for Hg2+ in aqueous solution and living cells

2019 ◽  
Vol 11 (25) ◽  
pp. 3150-3154 ◽  
Author(s):  
Daying Liu ◽  
Hualing Zhu ◽  
Jun Shi ◽  
Xinxin Deng ◽  
Tingting Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
High Selectivity ◽  
Fluorescent Sensor ◽  
Picolinic Acid ◽  
Iminodiacetic Acid ◽  
Living Cells

A new 4-amino-1,8-naphthalimide-based fluorescent sensor, with iminodiacetic acid and picolinic acid as receptors, was developed and applied successfully to detect Hg2+ in aqueous solution and living cells.

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