Bagher Eftekhari-Sis

A fine Pd nanoparticles (NPs) were supported on a metal–organic framework (MOF) based on Zn(II) and 4‐([4,2′:6′,4″‐terpyridin]‐4′‐yl)benzoic acid (terpy) and 2‐aminoterephthalic acid ligands (terpy‐Zn MOF). Pd NPs were supported on the terpy‐Zn MOF by in situ reduction to Pd ²⁺ ions in the presence of terpy‐Zn MOF. Prepared Pd@terpy‐Zn MOF was characterized using scanning electron microscopy (SEM), energy dispersive X‐ray spectroscopy (EDS), high‐resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) patterns, powder X‐ray diffraction (XRD), Brunauer–Emmett–Teller (BET), Barrett–Joyner–Halenda (BJH), and X‐ray photoelectron spectroscopy (XPS) analysis, and used as catalyst for the selective hydrogenation of C=C bonds. Pd@terpy‐Zn MOF exhibited high catalytic activity for the selective hydrogenation of C=C double bonds of α , β ‐unsaturated ketones and carboxylic acids, in which the C=O bonds remain unchanged. Pd@terpy‐Zn MOF‐catalyzed hydrogenation of chalcones occurred in 25%–93% conversion with excellent selectivity toward hydrogenation of the C=C bonds in the presence of the C=O bonds. Also, Pd@terpy‐Zn MOF efficiently catalyzed the hydrogenation of styrene derivatives to the corresponding ethylbenzene derivatives in up to 99% conversion. Aliphatic terminal and internal alkenes, such as 1‐decene and trans ‐2‐heptene, were also hydrogenated in the presence of Pd@terpy‐Zn MOF catalyst. The presence of hydroxyl, amine, and carboxylic acid functional groups in the structure of the alkene was well tolerated under the reaction conditions, to give the corresponding saturated counterpart in 94%–96% conversion. The study of the catalyst recovery indicated that the catalyst could be recycled and reused for five runs without a considerable loss in catalytic activity.

N,S ‐Doped highly ordered mesoporous carbon ( N,S ‐doped OMC) material was constructed by the nanocasting methodology using egg yolk with a high content of amino acids as a carbon precursor and SBA‐15 as a hard template, followed by carbonization at 500 °C under an N ₂ atmosphere, and then aqueous alkaline‐induced removal of the silica moiety of the SBA‐15 template. Prepared N,S ‐doped OMC material efficiently catalyzed the formylation of various substituted anilines using DMF as a formylating agent in water, to afford N ‐formylaniline derivatives in high to excellent yields. Also, as‐prepared N,S ‐doped OMC was used to immobilize and stabilize the Pd nanoparticles in order to synthesize Pd@OMC material, which was used as an efficient catalyst for the hydrogenation of nitroaromatic compounds to the corresponding aniline derivatives. Nitroaromatic compounds are considered to be highly toxic water contaminant compounds, and their removal from wastewater by the hydrogenation is an interesting method. Furthermore, Pd@OMC catalyzed one‐pot tandem hydrogenation of nitrobenzene/formylation reactions was investigated, which gave corresponding N ‐formyl aniline in high yield. Synthesized OMC and Pd@OMC were characterized using X‐ray diffraction (XRD), Brunauer‐Emmett‐Teller (BET), scanning electron microscopy (SEM), energy‐dispersive X‐ray spectroscopy (EDS), and transmission electron microscopy (TEM) analysis.

Detailed analysis of 1D and 2D supramolecular polymeric aggregations in Pb-complexes, driven by Pb⋯NCS and Pb⋯SCN tetrel bonds.

Novel complex [Pb(HL′)Cl₂]·MeOH (1·MeOH) was synthesized from an equimolar reaction of N′-isonicotinoylpicolinohydrazonamide (HL) with PbCl₂, where HL′ is a zwitterionic form of HL with the protonated 4-pyridyl and deprotonated amide nitrogen atoms.

A new amphiphilic azo‐functionalized polyhedral oligomeric silsesquioxane (POSS) derivative was synthesized by functionalizing octa(3‐aminopropyl)silsesquioxane (OAS‐POSS) with 4‐((4‐(dodecyloxy)phenyl)diazenyl)benzoic acid, affording a hydrophilic amino POSS head and hydrophobic dodecyl tail with a diphenyl‐azo connector. Prepared amphiphilic azo‐functionalized POSS (azo‐POSS) exhibited high ability for encapsulation and transferring cationic dyes into the organic phase by vigorously mixing with aqueous solutions of each dye. The photo‐controlled encapsulating properties of the synthesized phase transfer reagent was studied using cationic dyes, such as methylene blue (MB), crystal violet (CV) and thymol blue in acidic conditions. Results showed more than 95 % encapsulation of MB. However, no considerable encapsulation was shown in the case of anionic dyes such as eriochrome black T (EBT) and thymol blue in alkaline solutions. By trans/cis isomerization of the azo moiety of the phase transfer reagent by UV irradiation (365 nm), the amount of dye encapsulation was decreased, which could be attributed to the formation of cis isomer that led to the folding of the dodecyl alkyl tail on the POSS moiety, and therefore prevent to lay the 3‐aminopropyl moieties of POSS head to the water/DCM interface to adsorb and encapsulate MB molecules.