Dioxygen Affinity and Catalytic Performance of Bis-(furaldehyde) Schiff Bases Co(II) Complexes in Cyclohexene Oxidation

As mimetic oxygen carrier or oxidation catalyst, Schiff base cobalt complexes such as Co (II) salen have been widely studied1-4. However their high-price greatly limited their application. The synthesis of cheap furaldehyde Schiff bases and their complexes with Co (II), as well as the dioxygen affinity and biomimetic catalytic oxidation performance of these complexes are worth trying to study. In this paper, the saturated dioxygen uptake of cobalt complexes with different bis-(furaldehyd…     

On-Line Multichannel Raman Spectroscopic Detection System For Capillary Zone Electrophoresis

Detection and peak identification are key factors in developing CE (capillary electrophoresis) methodology. They have become hotspots for many reasons. The most obvious one lies in the revealing of unknown species in the application of CE to biological samples. CE-MS and CE-NMR have since been developed. CE-Raman spectroscopy was also reported1. As compared to the former two methods, the Raman spectroscopy method is highly attractive because it has the potential to provide high-informat…     

Polynaphthoxazines-Montmorillonite Nanocomposites: Synthesis and Characterization

Thermally resistant structural materials play a key role in the progress of the electronics and aerospace industries. Polybenzoxazine, a novel ring-opening phenolic resin, with superior properties such as no volatile emission when curing, near zero shrinkage and high mechanical performance, can be deemed as alternatives of traditional phenolics. Layered clays dispersed in a polymer matrix on nanoscale reinforced the thermal resistance and mechanical performance of the composite. The prepara…     

A New Monodisperse Reactive Resin with Active Groups on the Particle Surface

The cross-linked polymer beads with reactive groups as active supports have been widely used in many fields such as chromatographic separation, solid phase synthesis, catalytic reaction, ion exchange and adsorption etc. In resent years, the synthesis and application of monodisperse polymer beads with different structures have been rapidly developed1~4. It is obvious that this type of monosized resin as matrix of active supports will be even more advantageous in some applications. This paper pr…     

Enantiomeric Separation of Amino Alcohols by Ion-pair Chromatography

Many drugs or physiologically important compounds are chiral molecules and the optical isomers of them may differ in their pharmacological activities. In some instances differences in undesirable side-effects of these enantiomers are important. So the separation of chiral compounds is becoming increasingly important. Liquid chromatography (LC) is well known as an excellent method for separating and analyzing mixtures of stereoisomers. For resolving the ionic chiral compounds it is available t…     

Study of Oxidation of Glutathione Treated with Hypochlorous Acid by Capillary Electrophoresis

Glutathione (GSH) protects human and animal's cells by the exchange with reversible oxidized glutathione (GSSG) when cells meet with oxidants, such as hydrogen peroxide (H2O2) and lipid peroxide. But when GSH meets with hypochlorous acid (HOCl), via the myeloperoxidase-catalysed oxidation of chloride by H2O2, the amount of GSSG formed does not account for all the GSH lost, which is quite different from that we has investigated in the reaction of GSH with H2O21. Prutz proposed the fo…     

Theoretical Studies on the Conformation of mono-6-O-p-nitrobenzoyl-β-cyclodextrin in Aqueous Solution

It is well known that a substituted cyclodextrin (CD) can often form a self-included complex, in which the substituent group is incarcerated into the CD cavity1. The phenomenon is interesting, as the self-inclusion is a nice model of protein folding2 and it has also been successfully used in the construction of various molecular devices3. Studies have showed that van der Waals force, hydrophobic effect, and electrostatic interaction are the major driving forces leading to the self-inclusion4…     

Microwave-assisted Polymerization of D,L-Lactide with Stannous Octanoate as Catalyst

Poly (lactic acid) (PLA) is an important member of the polyesters which are used as biomedical materials in bioresorbable suture, implantates and drug controlled release systems1. PLA is prepared by two routs2: ring-opening polymerization of dimeric cyclic lactide or direct polycondensation of lactic acid. The ring-opening polymerization has attracted much more scientific and industrial interests than the later one, but both methods need long time for the polymerization reactions to be compl…     

Synthesis and Photochemistry of Diphenylchlorin and Diphenylbacteriochlorin

5, 15-Diphenylporphyrin (DPP), a novel porphyrin model compound, was always inaccessible in quantities suitable for study1 because the difficulty of synthesis. So that the characteristic of this molecule had not been explored until a novel method developed for the preparation of DPP recently2. Therefore it will be possible for the synthesis of DPP-based photosensitizers, and investigation of their photodynamic properties. Here we reported the synthesis of novel photosensitizers 5, 15-diphe…     

The CH_3OH+Cl Hydrogen Abstraction Reactions: An ab initio Study

The hydrogen abstraction from methanol by atomic chlorine can proceed via two possible channels: CH3OH + Cl → CH2OH + HCl (i) → CH3O + HCl (ii)In 2000, Ahmed et al1. reported their investigation for the H abstraction dynamics of the CH3OH+Cl reaction by crossed molecular beams in conjunction with velocity map imaging. Hydroxymethyl (CH2OH) was detected in their experiments. In 1998, Jodkowski et al2. reported their theoretical study on the CH3OH+Cl reactions. They located inte…