Shedding Light on the Lewis Acid Catalysis in Organic Transformations Using a Zn-MOF Microflower and Its ZnO Nanorod

Gandhi, S.; Sharma, Vandana; Koul, Ishfaq S.; Mandal, Sanjay K.

doi:10.1007/s10562-022-04004-4

Cited by 15 publications

(18 citation statements)

References 78 publications

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“…This reaction is generally catalyzed by Lewis acids and bases under homogeneous or heterogeneous conditions. 46 In recent years, this reaction has become a model reaction for the viability of CPs and MOFs as Lewis acid catalysts utilizing the unsaturated metal center(s). 47 In this study, we got an opportunity to compare three CPs ( 1–3 ) and one molecular rectangle ( 4 ) for the same purpose at room temperature.…”

Section: Resultsmentioning

confidence: 99%

“…The optimized conditions used for 2a and 4a were compared with those reported in the literature (Table S7†). 46,48–64…”

Section: Resultsmentioning

confidence: 99%

“…The optimized conditions used for 2a and 4a were compared with those reported in the literature (Table S7 †). 46,[48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64] For demonstrating the versatility of 2a and 4a, this reaction was carried out with a variety of substituted aromatic aldehydes and malononitrile under the optimized conditions to synthesize the corresponding α,β-unsaturated compounds (Table 4 and Fig. S22-S38 †).…”

Section: Catalysis Studiesmentioning

confidence: 99%

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Effect of the flexible chain length of a dimetal subunit on the formation of 1D coordination polymers to molecular rectangles

et al. 2022

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Section: Resultsmentioning

confidence: 99%

“…The optimized conditions used for 2a and 4a were compared with those reported in the literature (Table S7†). 46,48–64…”

Section: Resultsmentioning

confidence: 99%

Section: Catalysis Studiesmentioning

confidence: 99%

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Effect of the flexible chain length of a dimetal subunit on the formation of 1D coordination polymers to molecular rectangles

et al. 2022

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“… These catalysts have limitations with respect to recyclability and high catalyst loadings. However, in recent times, the use of metal–organic frameworks and nanostructures made thereof has been a trend for the synthesis of such compounds . Interestingly, there is only one report where CdS nanorod was used as a heterogeneous catalyst for such a process .…”

Section: Introductionmentioning

confidence: 99%

“…However, in recent times, the use of metal−organic frameworks and nanostructures made thereof has been a trend for the synthesis of such compounds. 35 Interestingly, there is only one report where CdS nanorod was used as a heterogeneous catalyst for such a process. 36 Therefore, it is highly desired to develop new CdS nanostructures to apply in heterogeneous catalysis, preferably at room temperature and under solvent-free conditions.…”

Section: ■ Introductionmentioning

confidence: 99%

CdS Nanostructures with Diverse Morphology as Heterogeneous Lewis Acid Catalysts

Kaur

Mandal

2022

ACS Appl. Nano Mater.

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CdS is one of the semiconductor nanomaterials (band gap: ∼2.42 eV) that has been exploited for its unique physical, chemical, and optical properties, notably for its good charge carrier capacity and photocatalytic activity. Additionally, CdS possesses good Lewis acidity to contend as an emerging efficient heterogeneous catalyst for organic transformation reactions. In this work, a very simple and easy-to-handle method has been utilized to fabricate diverse CdS nanostructures (CdS_1a–CdS_6a) from a mixture of {[Cd2(bpta)2(adc)2]·2H2O} n or {Cd2(bpea)2(adc)2} n (where bpta = N,N′-bis(pyridyl-t-butyl) amine, bpea = N,N′-bis(pyridylethyl) amine, and adc = acetylene dicarboxylate) and thiourea as the Cd2+ and S2– sources, respectively, in three different solvents (methanol, ethanol, and tert-butanol) under solvothermal conditions at 120 °C for 6 h. Moreover, a time-dependent evolution study was utilized for the understanding of their formation at optimized conditions. Their varied morphologies (hollow and porous) were confirmed by field-emission scanning electron microscopy (FESEM). The crystallinity and bulk phase purity of all CdS nanostructures was confirmed by powder X-ray diffraction (PXRD), energy-dispersive X-ray (EDX) spectroscopy, X-ray photoelectron spectroscopy (XPS), and high-resolution transmission electron microscopy (HRTEM). On the basis of their solid-state ultraviolet–visible (UV–vis) diffuse reflectance spectra, the band gap values in the range of 2.441–2.5 eV were calculated from the Tauc plot. Their porosity and surface area were measured by a N2 adsorption experiment. Furthermore, the emission spectra showed maximum intensity in the case of nanostructures fabricated in ethanol, followed by those fabricated in methanol and tert-butanol, respectively. Among all of the nanostructures, as-synthesized CdS_3a was found to be the best heterogeneous catalyst to prepare several bis(indolyl)methanes (BIMs) at room temperature under solvent-free conditions. The recyclability up to three cycles and the stability of the catalyst were also confirmed.

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Cobalt Coordination Polymers Offering Hydrogen Bonding Cavities as Efficient Catalysts for Coupling Reactions

Pachisia,

Goyal,

Aashish

et al. 2023

ChemCatChem

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This work presents the synthesis and characterization of two cobalt‐based coordination polymers (CPs) prepared by using two positionally related pyridine‐2,6‐dicarboxamide fragment‐based ligands containing appended arylcarboxylic acid groups. While arylcarboxylate groups of ligands coordinate to the Co(II) ions to produce 2D CPs; the amidic N‐H groups remain free and generate large cavities lined with hydrogen bonds. Such hydrogen bonding cavities were found to reversibly adsorb molecular iodine. The Lewis acidic Co(II) ions and metal‐coordinated labile solvent molecules promoted noteworthy heterogeneous catalysis for Friedel crafts reactions as well as multicomponent condensation reactions.

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Shedding Light on the Lewis Acid Catalysis in Organic Transformations Using a Zn-MOF Microflower and Its ZnO Nanorod

Cited by 15 publications

References 78 publications

Effect of the flexible chain length of a dimetal subunit on the formation of 1D coordination polymers to molecular rectangles

Effect of the flexible chain length of a dimetal subunit on the formation of 1D coordination polymers to molecular rectangles

CdS Nanostructures with Diverse Morphology as Heterogeneous Lewis Acid Catalysts

Cobalt Coordination Polymers Offering Hydrogen Bonding Cavities as Efficient Catalysts for Coupling Reactions

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