• TAPASHI GHOSH ROY

      Articles written in Journal of Chemical Sciences

    • Synthesis, characterization and antimicrobial studies of cadmium(II) complexes with a tetraazamacrocycle (LB) and its cyanoethyl N-pendent derivative (LBX)

      MD SHAH ALAM SASWATA RABI MD MASUDUR RAHMAN ADRITY BAIDYA MANASHI DEBI TAPASHI GHOSH ROY

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      An isomeric ligand, LB) of 3,10-C-meso-Me8) [14]ane on alkylation reaction with excess acrylonitrile resulted in a stereoselective product trans-(3S,5S,10R,12R)-N1,N8-bis(2-cyanoethyl)-C-meso-derivative, LBX) . Reaction of LB) with Cd(ClO4) )2) · 4H2)O in methanol gave the octahedral complex, [Cd(LB))(ClO4))2) ] whereas interaction of the ligand LBX) with Cd(NO3) )2) · 4H2) O in methanol yielded a square pyramidal mononitratocadmium(II) nitrate complex, [Cd(LBX) )(NO3))](NO3)) and an octahedral dinitratocadmium(II) complex, [Cd(LBX) )(NO3))2)]. The complexes, [Cd(LB))(ClO4))2)] and [Cd(LBX))(NO3))2)] underwent axial substitution reactions with KCNS and KBr to produce octahedral diisothiocyanatocadmium(II) complexes,

      [Cd(B))(NCS)2)] and [Cd(LBX))(NCS)2)] and octahedral dibromidocadmium(II) complexes, [Cd(LB))(Br)2)] and [Cd(LBX))(Br)2)], respectively; whereas, [Cd(LBX))(NO3))](NO3)) underwent axial addition with KCl, simultaneous axial substitution and anion exchange with KCNS and simultaneous axial addition, substitutionand anion exchange with NaClO4)· 6H2)O to produce octahedral [Cd(LBX))(NO3))Cl], square planar octahedral [Cd(LBX))(H2)O)2)](ClO4))2), respectively. The newly prepared compounds have been characterized by differentanalytical and spectroscopic methods. The antibacterial activities of the ligands, metal salts and complexes have been tested against two selected gram positive bacteria and two gram negative bacteria

    • Nickel(II), copper(II) and zinc(II) complexes with an N-pendent dimethyl derivative of an octamethyl macrocyclic ligand: synthesis, characterization and antimicrobial studies

      SUMAN KANTI DAS GUPTA SASWATA RABI DEPONKOR GHOSH FARHANA YASMIN BENU KUMAR DEY SUJAN DEY TAPASHI GHOSH ROY

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      Interaction of CH3I with L (3,10-C-meso-Meg[14]diene) in the ratio of 4:1 in ethanolic solution at room temperature yielded N-pendent dimethyl derivative [(L-2H)(–CH3)2] denoted by LZ. Interaction of nickel(II) acetate tetrahydrate with LZ and subsequent addition of NaClO4.6H2O produced square planar orange-yellow product, [NiLZ](ClO4)2. The reaction of copper(II) perchlorate hexahydrate with LZ afforded four coordinated square planar red [CuLZ](ClO4)2. However, on the reaction of zinc(II) nitrate hexahydrate with LZ furnished white six coordinated two distereoisomeric complexes [ZnLZa(NO3)2] and [ZnLZb(NO3)2].Axial addition reactions on four coordinated square planar [NiLZ](ClO4)2 with KX (X= SCN, NO3, Cl, Br or I) and NaNO2 resulted in six coordinated octahedral and square pyramidal axial addition products, such as [NiLZ(NCS)2], [NiLZ(NO3)(ClO4)], [NiLZCl(ClO4)], [NiLZBr2], [NiLZI2] and [NiLz(NO2)](ClO4), respectively. However axial substitution reactions on [ZnLZa(NO3)2] with KY (Y= SCN, Cl or Br) and NaNO2 produced six coordinated octahedral axial substitution products [ZnLZa(NCS)2], [ZnLZaCl2], [ZnLZaBr2] and [ZnLZa(NO2)2]. Similarly, the axial substitution reactions on [ZnLZb(NO3)2] with KI and NaClO4.6H2O resulted in six coordinated octahedral axial substitution products [ZnLZbI2] and [ZnLZb(H2O)2](ClO4)2, respectively. The compounds have been characterized by analytical, spectroscopic, magnetochemical and conductivity data. The antimicrobial activities of the new ligand and its complexes have been tested against different micro pathogens..

      Nickel(II), copper(II) and zinc(II) complexes with an N-pendent dimethyl derivative ligand LZ of an octamethyl tetraazmacrocyclic ligand were prepared. The compounds were characterized by different analytical and spectroscopic methods. Antibacterial and antifungal activities of these compounds against some bacteria and fungi were also investigated.

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