HETEROBIMETALLIC DIOXOMOLYBDENUM(VI) COMPLEXES DERIVED FROM BIS(2-HYDROXY-1-NAPHTHALDEHYDE)MALONOYLDIHYDRAZONE: SYNTHESIS AND CHARACTERIZATION

bis(2-hydroxy-1-naphthaldehyde)malonoyldihydrazone heterobimetallic dioxomolybdenum dioxouranium magnetic moment spectroscopic studies

МОНОМЕРНЫЙ КОМПЛЕКСНЫЙ АНИОН [HfF5(H2O)2]– В КРИСТАЛЛИЧЕСКОЙ СТРУКТУРЕ ТРИГИДРАТА ПЕНТАФТОРОГАФНАТА 4-АМИНО-1,2,4-ТРИАЗОЛИЯ: СИНТЕЗ И РЕНТГЕНОСТРУКТУРНОЕ ИССЛЕДОВАНИЕ, ХИРАЛЬНЫЙ ЭФФЕКТ В ПАРАМЕТРАХ СЕЧЕНОВА РАСТВОРИМОСТИ АРГОНА В ВОДНЫХ РАСТВОРАХ a-валина И a-ФЕНИЛАЛАНИНА, ...

The composition of the complexes is established based on the data obtained from the elemental analysis and molecular weight determinations. <...> The structure of the complexes is discussed in the light of data obtained from molar conductance, magnetic moment, electronic, EPR and IR spectroscopic studies. <...> Molybdenum-copper complexes or tungsten-copper complexes combining polyfunctional ligands constitute an interesting system for research due to their diverse structural chemistry and relevance to biological systems [ 3 ]. <...> In catalysis, a heterobimetallic complex containing an electron deficient metal atom and an electron rich metal atom presents the possibility of Lewis acid activation of a substrate molecule bound to the electron rich metal centre due to the electronic interaction between metals and cooperative activation of the substrate [ 9, 10 ]. <...> These complexes might be helpful in investigating the mutual influence of the two metal centres on the electronic, magnetic, and redox properties of such systems [ 11, 12 ]. <...> Structure of bis(2-hydroxy-1-naphthaldehyde)malonoyldihydrazone (H4L) ligands A survey of the literature reveals that although works on metal complexes of monohydrazide based ligands and their Schiff bases have been carried out in some details [ 17—19 ], but those on metal complexes of dihydrazones containing active methylene functions are quite meagre. <...> In view of the above importance of the heterobimetallic complexes of molybdenum and the virtual absence of work on heterometallic complexes of dihydrazones, the present paper aims to describe the synthesis of some heterobimetallic complexes of molybdenum in its 6+ oxidation state, derived from the polyfunctional dihydrazone (H4L) ligand (Fig. 1). <...> The complexes were mainly characterized based on the elemental analyses and molecular weight determinations. <...> The structure of the complexes has been discussed in the light of molar conductivity, 1H NMR, IR spectra, magnetic moment, EPR, and electronic spectral data. <...> Malonoyldihydrazine (MDH), H4L ligand, and MoO2(acac) were prepared by the literature methods [ 15, 20 ]. <...> The monometallic dioxomolybdenum complex [MoO2(H2L)]ŒH2O was prepared by the reaction of molybdenyl acetylacetone with the H4L ligand in the 1:1 molar ratio in ethanol [ 15 ]. <...> The molar conductance of the complexes was measured on a Direct Reading Conductivity meter-303 with a dip type conductivity cell at room temperature in DMSO (103 M). <...> Molecular weights were determined in a DMSO solution by the freezing point depression method <...>

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