Post modification of zinc based coordination polymer to prepare Zn‐Mo‐ICP nanoparticles as efficient self‐supported catalyst for olefin epoxidation

Abstract

Preparation, characterization, and catalytic properties of bimetallic coordination polymer constructed from 2‐aminoterephthalic acid as linker, zinc cations as node, and cis‐dioxo molybdenum units as catalytic active sites are reported via two pathways. Molybdenum centers were placed in N,O positions created by condensation reaction of 2‐aminoterephthalic acid with salicylaldehyde while zinc cations coordinated via carboxylic acid groups of linker to achieve infinite chains of metalo‐ligand. The obtained coordination polymer was fully characterized and its catalytic properties in the epoxidation of olefins with tert‐butyl hydroperoxide (TBHP) described. In comparison with previously reported heterogenized molybdenum catalysts, this new coordination polymer exhibited good conversion as well as high selectivity in the epoxidation of olefins. The catalyst is stable under ambient conditions and could be reused as active catalyst for at least five times.

Designing a New Efficient Photocatalyst Based on Functionalization of Zn-Infinite Coordination Polymer with Ru(acac)3 Complex for Dye Degradation in Aqueous Solutions: Charge Separation Effect

“…For investigating the nature of active species involved in the photocatalytic degradation experiments, trapping tests were conducted, in which Ru-Zn-ICP was employed as the photocatalyst for RhB degradation upon visible light irradiation, and the results are given in Figure b. Three scavengers, i.e., isopropyl alcohol (IPA), ethylenediaminetetraacetic acid (EDTA), and benzoquinone (BQ), were utilized for identifying • OH, photogenerated h + , and • O 2 – , respectively, which are the main active species involved in photocatalytic degradation processes . The results showed that utilizing IPA as a scavenger results in decreasing RhB degradation in comparison to the conditions performed in the absence of scavenger, indicating a little involvement of • OH species in the degradation process.…”

“…Then, the product was separated and rinsed with methanol five times through centrifugation–redispersion cycles. The obtained Zn-ICP solid was dried under vacuum for 24 h …”

“…Recently, some zinc-containing ICPs with thermally stable and robust structures have been prepared and examined as heterogeneous catalysts and photocatalysts. − However, to our knowledge, there is no report on the functionalization of this type of ICP with ruthenium complexes to obtain a new photocatalyst.…”

“…In continuation of our ongoing studies, − we report the preparation of a visible light photoactive zinc-based coordination polymer functionalized with Ru­(acac) 3 as a new visible light photocatalyst for degradation of Rhodamine B (RhB) and reactive orange-29 (RO29) dyes and amoxicillin (AMX) drug as water pollutants. Furthermore, the role of Ru­(acac) 3 as a co-catalyst is explained, which promotes the photocatalytic activity of the photocatalyst by electron–hole separation and retarding their recombination.…”

Encapsulation of Molybdenum Schiff‐base Complex Inside the SBA‐16 Nanocages with ship‐in‐a–bottle Strategy for Selective Epoxidation of Alkenes

“…[4] Therefore, using a solid material to heterogenize the molybdenum Schiff-base complexes seems more applicable in many aspects especially for facile separation of catalyst. Several solid materials including activated carbon, [5] carbon nanotube, [6] graphene oxide, [7] chitosan, [8] SBA-16, [9] magnetite nanoparticles, [10] coordination polymers [11] and metal organic frameworks [12] have been utilized to heterogenize molybdenum Schiff-base complexes on the surface or within the pores.…”