Browsing by Author "Kumar, Ashwani"

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    Dithiophosphonate Anchored Heterometallic (Ag(I)/Fe(II)) Molecular Catalysts for Electrochemical Hydrogen Evolution Reaction
    (American Chemical Society, 2022-08-12T00:00:00) Jangid, Dilip Kumar; Dastider, Saptarshi G.; Biswas, Rathindranath; Khirid, Samreet; Meena, Sangeeta; Kumar, Pankaj; Sahoo, Subash C.; Verma, Ved Prakash; Makde, Ravindra D.; Kumar, Ashwani; Jangir, Ravindra; Mondal, Krishnakanta; Haldar, Krishna Kanta; Dhayal, Rajendra S.
    The dichalcogenide ligated molecules in catalysis to produce molecular hydrogen through electroreduction of water are rarely explored. Here, a series of heterometallic [Ag4(S2PFc(OR)4] [where Fc = Fe(?5-C5H4)(?5-C5H5), R = Me, 1; Et, 2; nPr, 3; isoAmyl, 4] clusters were synthesized and characterized by IR, absorption spectroscopy, NMR (1H, 31P), and electrospray ionization mass spectrometry. The molecular structures of 1, 2, and 3 clusters were established by single-crystal X-ray crystallographic analysis. The structural elucidation shows that each triangular face of a tetrahedral silver(I) core is capped by a ferrocenyl dithiophosphonate ligand in a trimetallic triconnective (?3 ?2, ?1) pattern. A comparative electrocatalytic hydrogen evolution reaction of 1-5 (R = iPr, 5) was studied in order to demonstrate the potential of these clusters in water splitting activity. The experimental results reveal that catalytic performance decreases with increases in the length of the carbon chain and branching within the alkoxy (-OR) group of these clusters. Catalytic durability was found effective even after 8 h of a chronoamperometric stability test along with 1500 cycles of linear sweep voltammetry performance, and only 15 mV overpotential was increased at 5 mA/cm2 current density for cluster 1. A catalytic mechanism was proposed by applying density functional theory (DFT) on clusters 1 and 2 as a representative. Here, a ?1 coordinated S-site between Ag4 core and ligand was found a reaction center. The experimental results are also in good accordance with the DFT analysis. � 2022 American Chemical Society.
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    Prevalence and Underlying Threats of Drug Abuse: A Case Study on Kathua District (Jammu and Kashmir)
    (Ashdin Publishing, 2023-05-30T00:00:00) Sharma, Ankush; Kumar, Ashwani; Sharma, Rozi
    The present study analyzes the problem of drug abuse in the Kathua district of Jammu and Kashmir. The geographical location of the place is such that it is one of the driving factors of drug menace vis-�-vis a threatening factor for the national security. The paper tries to present a clear picture of the extent of drug abuse in the region and the concerns associated with it. It presents data from various government reports, newspapers, as well as the data collected from the Department of Psychiatry, Government Medical College, Kathua and District Police, Kathua. A survey is also conducted for the study with a sample size of 500 using random sampling. It uses pie charts and graphs to present data in a lucid manner. This study is an attempt to understand the causes of drug menace in the district and also suggesting the measures to address it. � 2022 Ankush Sharma, et al.