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31.
Jabeen M. Ali S. Shahzadi S. Shahid M. Sharma S. K. Qanungo K. 《Russian Journal of General Chemistry》2017,87(3):530-538
Russian Journal of General Chemistry - Vanadium(IV) and vanadium(V) complexes 1–7 have been synthesized by the reaction of isonipecotic acid with VOSO4 · 3 H2O, VCl3(THF)3, and NH4VO3 at... 相似文献
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Supramolecular Complexation of Biological Phosphates with an Acyclic Triazolium‐Linked Anthracenyl‐1,3‐Diconjugate of Calix[4]Arene: Synthesis,Characterization, Spectroscopy,Microscopy, and Computational Studies 下载免费PDF全文
Dr. V. V. Sreenivasu Mummidivarapu Dr. Vijaya Kumar Hinge Kushal Samanta Deepthi S. Yarramala Prof. Dr. Chebrolu Pulla Rao 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(44):14378-14386
A triazolium‐anthracenyl calix[4]arene conjugate ( L ) was synthesized by methylating the precursor triazole derivative and then characterized. The potential of the cationic L to differentiate nucleoside triphosphates (NTPs) from their mono‐ and diphosphates was demonstrated. Due to its unique combination of arms with the calix‐platform, a fluorescence enhancement was observed for L with all the NTPs, whereas there is no report with such enhancement being exhibited in case of all the NTPs. This has been supported by the aggregation of L observed from microscopy. Selectivity of L towards NTPs over other phosphates was a result of specific weak interactions, namely, ion–ion, hydrogen bonding and π ??? π, present in the 1:2 complex of L and NTPs (based on ESI MS), which were absent in their congener‐phosphates as delineated by NMR and computational studies. Thus, L stands as a unique receptor for NTPs. 相似文献
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Fatma Karipcin Burcin Culu Saroj K. Sharma Kushal Qanungo 《Helvetica chimica acta》2012,95(4):647-659
The reaction of the ‘oximato’‐ligand precursor A (Fig. 1) and metal salts with KCN gave two mononuclear complexes [ML(CN)(H2O)n](ClO4) ( 1 and 2 ; L={N‐(hydroxy‐κO)‐α‐oxo‐N′‐[(pyridin‐2‐yl‐κN)methyl[1,1′‐biphenyl]‐4‐ethanimidamidato‐κN′}; M=CoII ( 1 ), CuII ( 2 ); n=2 for CoII, n=0 for CuII; Figs. 2 and 3). The new cyano‐bridged pentanuclear ‘oximato’ complexes [{ML(H2O)n(NC)}4M1(H2O)x](ClO4)2 ( 3 – 6 ) and trinuclear complexes [{ML(H2O)n(NC)}2M1L](ClO4) ( 7 – 10 ) ([M1=MnII, CuII; x=2 for MnII, x=0 for CuII] were synthesized from mononuclear complexes and characterized by elemental analyses, magnetic susceptibility, molar conductance, and IR and thermal analysis. The four [ML(CN)(H2O)n]+ moieties are connected by a metal(II) ion in the pentanuclear complexe 3 – 6 , each one involving four cyano bridging ligands (Fig. 4). The central metal ion displays a square‐planar or octahedral geometry, with the cyano bridging ligands forming the equatorial plane. The axial positions are occupied by two aqua ligands in the case of the central Mn‐atom. The two [ML(CN)(H2O)n]+ moieties and an ‘oximato’ ligand are connected by a metal(II) ion in the trinuclear complexes 7 – 10 , each one involving two cyano bridging ligands (Fig. 5). The central metal ions display a distorted square‐pyramidal geometry, with two cyano bridging ligands and the donor atoms of the tridentate ‘oximato’ ligand. Moreover catalytic activities of the complexes for the disproportionation of hydrogen peroxide (H2O2) were also investigated in the presence of 1H‐imidazole. The synthesized homopolynuclear CuII complexes 6 and 10 displayed eficiency in disproportion reactions of H2O2 producing H2O and dioxygen thus showing catalase‐like activity. 相似文献
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Kushal C. Lekhok Dipak Prajapati Ramesh C. Boruah Sharbani Mazumder Tarun C. Borah 《Monatshefte für Chemie / Chemical Monthly》2009,18(4):1183-1187
Abstract
3-Aryl-2,1-benzisoxazoles and its salts underwent reductive cleavage of the N–O bond leading to 2-aminobenzophenones with bakers’ yeast under non-fermenting conditions in aqueous media. The procedure gives excellent yields of 2-alkylamino- and 2-aminobenzophenones. 相似文献35.
H. N. Khan S. Ali S. Shahzadi S. K. Sharma K. Qanungo 《Russian Journal of Coordination Chemistry》2010,36(4):310-316
New diorganotin(IV) derivative of 4-methyl-1-piperidinecarbodithioic acid (4-MePCDTA) have been synthesized by the reaction of dibutyltin(Acac)2 and ligand acid in a 1: 1 molar ratio in anhydrous chloroform at room temperature. The newly synthesized complex has been characterized by elemental, IR, and multinuclear NMR (1H and 13C). The diorganotin(IV) derivative is assessed to adopt distorted octahedral geometry in the solid state, while tetrahedral geometry is exhibited in a solution state. The modeled structure of the reported complex shows severely distorted octahedral geometry around tin. The axial tin carbon bond lengths are 2.15 Å. The Sn-O bond lengths for coordinated Acac in the equatorial plane are 2.37 and 2.23 Å, respectively. The complex was also tested for antimicrobial activity against different bacterial and fungal strains, artemia salina cytotoxicity, and plant phytotoxicity. The screening results show that the complex exhibits high antibacterial, antifungal, and artemia salina cytotoxicity and have a potential to be used as drug. Low phytotoxic activity shows that the reported compound can be used as agrochemical. The structure-activity relationship demonstrates that the compound having four-coordinated geometry in the solution state is more toxic. 相似文献
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Sengupta Soumitra K. Pandey Om P. Srivastava Akhilesh K. Bhatt Alpana Mishra Kushal N. 《Transition Metal Chemistry》1999,24(6):703-707
The reactions of Cp2>HfCl2> with hydrazones (LH) derived from acetylferrocene and aromatic acid hydrazides (benzoic, 2-chlorobenzoic, 3-nitrobenzoic and 4-toluic) in various stoichiometric ratios have been studied and the complexes of the types [Cp2>Hf(L)Cl] and [CpHf(L)3>] were obtained. Tentative structural conclusions are drawn for the reaction products based upon elemental analyses, electrical conductance, magnetic moment and spectral data (u.v.–vis, i.r., 1>H-n.m.r. and 13>C-n.m.r.). Studies were conducted to assess the growth-inhibiting potential of the complexes synthesized, and the ligands, against various fungal and bacterial strains. 相似文献
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Meenu Thakur B. R. Behera Ruchi Mahajan N. Saneesh Gurpreet Kaur Priya Sharma R. Dubey Kushal Kapoor A. Yadav Neeraj Kumar S. Kumar Kavita Rani P. Sugathan A. Jhingan A. Chatterjee M. B. Chatterjee S. Mandal A. Saxena Santanu Pal S. Kailas Avazbek Nasirov Bakhodir Kayumov 《The European Physical Journal A - Hadrons and Nuclei》2017,53(6):133
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Mahesh GAIDHANE Ajay GHATOLE Kushal LANJEWAR Kishor HATZADE 《Turkish Journal of Chemistry》2020,44(6):1495
Polyethylene glycol (PEG) is a polymer that is widely used as a carrier for drug delivery systems (DDS). A library of N-PEGylated quinoline derivatives of PEG molecular weight 200 was prepared rapidly after the activation of PEGs using maleic anhydride. Quinoline with a polymer backbone is essential as new material. PEG is a water-soluble nonionic polymer approved by food and drug organizations for medicine applications. Because of its nontoxic grapheme, it is widely utilized in numerous biochemical, cosmetic, pharmaceutical, and industrialized applications. The modern SwissADME is a web tool that stretches free admittance to a pool of hasty, yet solid, clarifying models for physicochemical properties, pharmacokinetics, and therapeutic science. The present facile synthetic strategy can be a practical approach for incorporating polymeric carriers conjugated with drug moieties, either in the backbone of the polymer or as a terminal and pendant group on the polymer chains. 相似文献