http://nopr.niscpr.res.in/handle/123456789/54453 2026-10-10T12:37:40Z http://nopr.niscpr.res.in/handle/123456789/54459 Title: Structural identification of two differently coordinated heptamolybdate ligands in a hexamagnesium compound Authors: Srinivasan, Bikshandarkoil R; Khandolkar, Savita S; Morajkar, Sudesh M Abstract: Dissolution of freshly prepared molybdenum trioxide in hot aqueous magnesium carbonate followed by crystallization results in the formation of an all-inorganic heptamolybdate compound viz. [Mg(H2O)6]3[Mg(H2O)5(Mo7O24)][(H2O)5Mg (µ2-Mo7O24)Mg(H2O)5]∙6H2O (1). The crystal structure, spectral characteristics, thermal and electrochemical properties of 1 are reported. Compound 1, which crystallizes in the acentric polar space group Cc, contains six unique Mg(II) ions. The two crystallographically independent heptamolybdate anions function as a monodentate (η1) and µ2-bridging bidentate ligand, respectively, forming the anionic [Mg(H2O)5(Mo7O24)]4− and [(H2O)5Mg(µ2-Mo7O24)Mg(H2O)5]2− species, which are charge balanced by three unique hexaaquamagnesium(II) cations. The electrochemical and conductivity studies of 1 reveal the presence of [Mg(H2O)6]2+ cations and uncoordinated (Mo7O24)6− anions in solution. Thermal decomposition of 1 leads to the formation of Mg2Mo3O11 via Mg6Mo14O48 and 3Mg2Mo3O11∙5MoO3. Page(s): 517-525 2020-04-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/54458 Title: VO(IV) complexes of N2O2 tetradentate ligands with flexible alkyl spacer: synthesis, characterization and antibacterial activities Authors: Ulucam, Guhergul; Yenturk, Busra Abstract: Three Schiff base ligands which contain N2O2 donors and their oxo-vanadium(IV) complexes have been synthesized. The ligand C14H16N2O2 has obtained as a result of the reaction of 1,4-diaminobutane with 2-furan-carboxyaldehyde within the framework of Schiff base condensation method. The same reaction path is followed replacing 1,4-diaminobutane by 1,6-diaminohexane and 1,8-diaminooctane in separate reactions to obtain the two other new ligands. Then, the synthesized ligands are employed to attain the oxo-vanadium(IV) complexes as results of their reactions with VOSO4.H2O. The ligands have been characterized by FTIR, 13C NMR, 1H NMR, and LC/ESI-MS. The VO(IV) complexes have been elucidated by FTIR, LC/ESI-MS, energy dispersive X-ray spectroscopy, thermogravimetric methods, and the conductivity and magnetic susceptibility measurements. The antibacterial activities of the ligands and their complexes have been determined on the microorganisms which are aligned as Escherichia coli ATCC 25922, Salmonella typhimurium ATCC 14028, Staphylococcus aureus ATCC 25923, Listeria monocytogenes ATCC 19115 and Bacillus cereus ATCC 11778. The complexes, in general, appeared to be more active than their parent ligands. All the activities can be classified as moderate in comparison with the corresponding antibiotic effect on the same bacteria. Page(s): 526-532 2020-04-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/54457 Title: Phosphorus-nitrogen compounds. Part 48. syntheses of the phosphazenium salts containing 2-pyridyl pendant arm: structural characterizations, thermal analysis, antimicrobial and cytotoxic activity studies Authors: Elmas, Gamze; Okumuş, Aytuğ; Kılıç, Zeynel; Özbeden, Pelin; Açık, Leyla; Tunalı, Beste Çağdaş; Türk, Mustafa; Çerçi, Nebahat Aytuna; Hökelek, Tuncer Abstract: The phosphazenium salts (protic ionic liquids, PILs/protic molten salts, PMOSs) (6a-6d and 7a) of the free phosphazene bases (4a-4d and 5a) have been prepared by the reactions of the corresponding cyclotriphosphazenes with the bulky gentisic acid. The structures of the PMOS have been evaluated using the elemental analyses, FTIR, 1H, 13C{1H} and 31P{1H} NMR data. The molecular and crystal structures of 4a and 6c are established by X-ray crystallography. The thermal properties of the PMOS are determined using TG and DTA techniques. On the other hand, the antimicrobial activities of the free phosphazene bases (4a-4d and 5a-5d) and PMOSs (6a-6d and 7a) are screened against the selected bacteria and yeast strains. The antimicrobial activities of the free phosphazene bases and the PMOSs are compared. The interactions of the phosphazenes and their salts with plasmid DNA are elucidated by the agarose gel electrophoresis. The evaluations of the cytotoxic activities of these compounds are also studied against to L929 fibroblast and breast cancer cells (MDA-MB-231). Page(s): 533-550 2020-04-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/54456 Title: Effect of micelles on hydrolysis of di-2,3-dichloroaniline phosphate Authors: Chhetri, Nisha; Bhoite, Shashikala A; Singh, Ajaya Kumar; Jain, Bhawana Abstract: The effect of anionic surfactant, di-octylsodium sulphosuccinate (AOT) and nonionic surfactant, polyoxyethylene sorbitanmonooleate (Tween-80) on the hydrolysis of di-2,3-dichloroaniline phosphate was studied spectrophotometrically at 303 K. The influence of inorganic salts on the reaction rate was studied. The added salts viz. KCl, KNO3, and K2SO4 accelerated the rate of the reaction in the presence of anionic and nonionic micelles. The role of anionic and non-ionic micelle has been explained by the Menger-Portnoy, and Piszkiewicz models. The binding constant (Ks), rate constant (kψ) in the micellar phase, co-operativity index (n) and various thermodynamic activation parameters viz. ∆Ea, ∆S≠, ∆H≠, ∆G≠ etc. have been evaluated. Possible reaction mechanism has been proposed on the basis of the observed kinetic data. Page(s): 551-562 2020-04-01T00:00:00Z