Polymer immobilized tantalum(v)–amino acid complexes as selective and recyclable heterogeneous catalysts for oxidation of olefins and sulfides with aqueous H₂O₂

Abstract

Polymer supported peroxotantalate based heterogeneous catalysts served as highly efficient, selective and recyclable catalysts for alkene epoxidation and sulfide oxidation with green oxidant aqueous H2O2 under mild reaction conditions.

A Comparative Study on Interactions of Ternary Copper(II) Complexes and Their Analogues Anchored Polymer (BPEI) with Serum Albumins

“…Moreover, the g k values are also greatly influenced by the donor types, the hard donors as well as distorted geometry cause g k to increase whereas soft donors and planar geometry cause g k to decrease. [34] Hence, the found g k values for the ternary copper(II) complexes anchored BPEI (1)(2)(3)(4)(5) are in the range of 2.2 À 2.4, confirming the presence of CÀ O and CÀ N bonds. All above spectral results confirms the proposed structure of ternary copper(II) complexes anchored BPEI (1-5) as mentioned in Scheme 1S.…”

“…[31] The band observed in the range of 1617-1633 cm À 1 and 1464-1472 cm À 1 can be associated with NÀ H asymmetric bending and CÀ H bending respectively. The bands around 852 cm À 1 and 730 cm À 1 observed for 1,10-phenanthroline ligand were red shifted in the range of 842-831 cm À 1 and 730-698 cm À 1 respectively in the complexes (1)(2)(3)(4)(5). These shifts could be explained by the fact that each of the two nitrogen atoms of phenanthroline ligands donates a pair of electrons to the central copper atom forming coordinate bond.…”

“…The ternary copper(II) complex units anchored to polymer was confirmed by comparison of UV-visible spectra of BPEI, precursor ternary copper(II) complexes and ternary copper(II) complexes anchored BPEI (3) as shown in Figure 2. Similarly, all the ternary copper(II) complexes anchored BPEI (1)(2)(3)(4)(5)…”

“…The metal complexes anchored polymer is a coordination complex, in which the metal complex is anchored to a polymer matrix through either one or more of its ligands by a coordinate bond. Many of them are used as catalysts for the synthesis of organic compounds of industrial and scientific importance, [1][2][3][4][5][6] but the studies on biological applications of the metal complexes anchored polymers were limited. [7,8] In our previous works, we have investigated cytotoxic property of several copper(II) and cobalt(III) metal complexes anchored polymers.…”

Copper based on diaminonaphthalene-coated magnetic nanoparticles as robust catalysts for catalytic oxidation reactions and C–S cross-coupling reactions

“…Their importance is based on the application in pharmaceutical industries and preparing a scaffold for aryl suldes as intermediates in synthetic organic chemistry. 33,34 Although the sulde and disulde oxidation reactions have been studied extensively, [35][36][37][38][39][40][41][42][43][44] it is necessary to introduce procedures that are more simple, efficient and selective. Herein, a magnetically separable heterogeneous catalyst was fabricated by anchoring a Cu complex supported on functionalized CoFe 2 O 4 nanoparticles.…”