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Self-assembly of copper and cobalt complexes with hierarchical size and catalytic properties for hydroxylation of phenol.

Dong H, Tao W, Bi J, Milway V, Xu Z, Zhang S, Meng X, Bi W, Li J, Li M - Nanoscale Res Lett (2011)

Bottom Line: A feasible and effective self-assembly method to synthesize different scale coordination polymers in highly dilute solution (from nanocrystals to microcrystals and to bulk crystals) without any blocking agent has been described.The growth of crystalline particles was controlled by removing the particles at different reaction times to interrupt the growth at the desired size.The nano and microscale particles show better catalytic conversions and selectivities in the hydroxylation of phenols than the bulk crystals.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Chemistry and Chemical Engineering, Hefei Normal University, Hefei 230061, People's Republic of China. dapdong@yahoo.com.cn.

ABSTRACT
A feasible and effective self-assembly method to synthesize different scale coordination polymers in highly dilute solution (from nanocrystals to microcrystals and to bulk crystals) without any blocking agent has been described. The growth of crystalline particles was controlled by removing the particles at different reaction times to interrupt the growth at the desired size. The nano and microscale particles show better catalytic conversions and selectivities in the hydroxylation of phenols than the bulk crystals.

No MeSH data available.


Related in: MedlinePlus

Catalytic phenol hydroxylation by H2O2.
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Figure 1: Catalytic phenol hydroxylation by H2O2.

Mentions: Hydroxylation of phenols with hydrogen peroxide is a widely used green method of preparing biphenols and is an industrially important reaction for the production of phenol derivatives, which have several large-scale industrial applications in the chemical, pharmaceutical and food industries [27]. Transition metal-based complexes and oxides are well-known catalysts in this reaction [28-34]. Herein, we present the size controllable synthesis of two series of hierarchical MCPs using a simple method under mild conditions. The catalytic activities of the crystalline MCPs were investigated in the hydroxylation of phenol (Figure 1). The as-synthesized MCPs {[M(phen)(C2O4)(H2O)] H2O, M = Cu(II) or Co(II), phen = 1,10-phenanthroline} exhibit better catalytic activities than the CP in the hydroxylation of phenols with H2O2 in aqueous solution and mild conditions, and a high conversion (73.08%, 50°C, 5 h) and high selectivity for hydroquinone with a maximum hydroquinone (HQ)/catechol (CAT) ratio of 3.83.


Self-assembly of copper and cobalt complexes with hierarchical size and catalytic properties for hydroxylation of phenol.

Dong H, Tao W, Bi J, Milway V, Xu Z, Zhang S, Meng X, Bi W, Li J, Li M - Nanoscale Res Lett (2011)

Catalytic phenol hydroxylation by H2O2.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211998&req=5

Figure 1: Catalytic phenol hydroxylation by H2O2.
Mentions: Hydroxylation of phenols with hydrogen peroxide is a widely used green method of preparing biphenols and is an industrially important reaction for the production of phenol derivatives, which have several large-scale industrial applications in the chemical, pharmaceutical and food industries [27]. Transition metal-based complexes and oxides are well-known catalysts in this reaction [28-34]. Herein, we present the size controllable synthesis of two series of hierarchical MCPs using a simple method under mild conditions. The catalytic activities of the crystalline MCPs were investigated in the hydroxylation of phenol (Figure 1). The as-synthesized MCPs {[M(phen)(C2O4)(H2O)] H2O, M = Cu(II) or Co(II), phen = 1,10-phenanthroline} exhibit better catalytic activities than the CP in the hydroxylation of phenols with H2O2 in aqueous solution and mild conditions, and a high conversion (73.08%, 50°C, 5 h) and high selectivity for hydroquinone with a maximum hydroquinone (HQ)/catechol (CAT) ratio of 3.83.

Bottom Line: A feasible and effective self-assembly method to synthesize different scale coordination polymers in highly dilute solution (from nanocrystals to microcrystals and to bulk crystals) without any blocking agent has been described.The growth of crystalline particles was controlled by removing the particles at different reaction times to interrupt the growth at the desired size.The nano and microscale particles show better catalytic conversions and selectivities in the hydroxylation of phenols than the bulk crystals.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Chemistry and Chemical Engineering, Hefei Normal University, Hefei 230061, People's Republic of China. dapdong@yahoo.com.cn.

ABSTRACT
A feasible and effective self-assembly method to synthesize different scale coordination polymers in highly dilute solution (from nanocrystals to microcrystals and to bulk crystals) without any blocking agent has been described. The growth of crystalline particles was controlled by removing the particles at different reaction times to interrupt the growth at the desired size. The nano and microscale particles show better catalytic conversions and selectivities in the hydroxylation of phenols than the bulk crystals.

No MeSH data available.


Related in: MedlinePlus