• Vivek K Gupta

      Articles written in Journal of Chemical Sciences

    • Synthesis of some new 4-aryloxmethylcoumarins and examination of their antibacterial and antifungal activities

      Mahantesha Basanagouda Manohar V Kulkarni Deepak Sharma Vivek K Gupta Pranesha P Sandhyarani Vijaykumar P Rasal

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      A number of new 4-aryloxymethylcoumarins 3 and 5 have been obtained from the reaction of various 4-bromomethylcoumarins with 2-nitro-𝑝-cresol 2 and 2,6-dibromo-𝑝-cresol 4. NOE studies have been carried out on two compounds to ascertain their spatial proximity. 𝑝-cresol ethers 7 have been subjected to bromination in chloroform and the position of bromine has been established by diffraction studies. Cleavage of the ether linkage has been observed during an attempted nitration of ethers 7. Antimicrobial activity of all the compounds against five bacterial and five fungal species have been reported.

    • Synthesis and crystal structure of [chlorobis(triphenylphospino) (p-chlorobenzaldehyde thiosemicarbazone)] copper(I) complex

      Ashiq Khan Poonam Sharma Rajnikant Vivek K Gupta Naresh Padha Rekha Sharma

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      Reactions of copper(I) halides with p-chlorobenzaldehyde thiosemicarbazone (H1L) and triphenylphosphine in 1 : 1 : 2 molar ratio yielded complexes of stoichiometry, [CuX(𝜂1-S- H1L)(Ph3P)2] (X = I, 1: Br, 2; Cl, 3). All the three complexes were characterized using analytical (CHNS) and spectroscopic (IR, 1H NMR) techniques. The structure of complex 3 was confirmed by X-ray crystallography. It has been found to crystallize in the triclinic system with space group P-1 and unit cell parameters: a = 10.207(5) Å, b = 13.027(5) Å, c = 16.269(5) Å, 𝛼 = 100.054(5)°, 𝛽 = 99.228(5)° and 𝛾 = 97.234(5)°. This complex has distorted tetrahedral geometry with two phosphorus atoms from two triphenylphosphine ligands, thione sulfur of thiosemicarbazone ligand and chloride ion occupying the four corners of the tetrahedron. The structure of complex 3 was in contrast to sulfur-bridged dinuclear complex of copper(I) chloride with benzaldehydethiosemicarbazone, [Cu2Cl2(𝜇2-S-Hbtsc)2(Ph3P)2]·2H2O. The intermolecular H-bonding, Cl· · ·HCph, 2.733 Å and 𝜋 interactions, {CHph · · · 𝜋, 2.796; 2.776 Å} in this complex led to the formation of 1D chain. Two such 1D chains were cross-linked via, Cl· · ·HCph, 2.896 Å H-bonding to form a 2D network.

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