Spectroscopic and Biochemical Studies of Some Manganese(II), Oxovanadium(V) and Dioxomolybdenum(VI) Complexes S/O and N Donor Agents Synthesized under Microwave Conditions

Abstract

The synthesis of some new manganese(II), oxovanadium(V) and dioxomolybdenum(VI) complexes with 5-chloro-1,3-dihydro-3-[2-(phenyl)-ethylidene]-2H-indol-2-one-hydrazinecarbothioamide (L 1 H) and 5-chloro-1,3-dihydro-3-[2-(phenyl)-ethylidene]-2H-indol-2-one-hydrazinecarboxamide (L 2 H) were carried out in unimolar and bimolar ratios. All the new derivatives have been characterized by elemental analyses, molecular weight determinations, molar conductance, magnetic measurements, i.r., 1 H-n.m.r. and e.s.r. studies. The i.r. and n.m.r. spectral data suggest the involvement of sulphur/oxygen and azomethine nitrogen in coordination to the central metal ion. The magnetic moment values of the manganese(II) complexes are in the 5.85-6.13 B.M. range, suggesting a high spin state in these complexes. Based on these spectral studies tetrahedral geometry for the manganese(II) complexes and octahedral geometry for the molybdenum complexes has been proposed. In the case of the oxovanadium complexes vanadium is in the penta and hexa coordinated environments. Compounds have been synthesized in an open vessel under microwave irradiation (MWI) using a domestic microwave oven. The reaction time decreases from hours to minutes with improved yield as compared to conventional heating. The free ligands and their metal complexes have been tested in vitro against a number of microorganisms in order to assess their antimicrobial properties. The results indicate that the ligands and their respective metal derivatives possess antimicrobial properties.

Spectroscopic and thermal investigations of complexes of CrIII, MnII, ZnII & CdII - carboxamide

“…The calculated g value for manganese(II) complex is 1.950 agrees well with the results previously for high spin tetracoordinated manganese(II) complexes [22], whereas g value …”

Application of green seaweed biomass for MoVI sorption from contaminated waters. Kinetic, thermodynamic and continuous sorption studies

“…In animals, Mo is present as a cofactor for redox enzymes such as xanthine oxidase, and it is essential for a fine performing of these enzymes [1]. In plants, this element is necessary for the fixation of atmospheric nitrogen by bacteria at the http://dx.doi.org/10.1016/j.jcis.2015.01.033 0021-9797/Ó 2015 Elsevier Inc. All rights reserved.…”

Microwave assisted hydrothermal synthesis of a novel CuI-sulfate-pyrazine MOF

“…Microwave dielectric heating, with the possible advantage of enhanced product yields and reduced reaction times, emerges as a feasible approach and begins to be entrenched not only in synthetic organic chemistry [17,18] but also in zeolites-type inorganic hybrid materials [19], and for nano-scale particle preparations [20]. However, the employment of this technique for the construction of well-defined MOFs accounts with very scarce reported structures [21][22][23].…”