Spectral and thermogravimetric studies of oxohalobis(4-morpholinyldithiocarbamato)molybdenum(V) complexes

Studies of some dioxo molybdenum (VI) complexes of a polydentate ligand

Abstract: Four dioxomolybdenum (VI) complexes of a polydentate ligand derived from Isatin and o-Phenylene Diamine (PDAI) were synthesized and characterized on the basis of different physico chemical methods. Thermal stability of one of the complexes was revealed from its thermal study. Antibacterial activities of the ligand, PDAI and one of its complexes were measured at different concentrations and none of them was found to be active towards S. aureus ATCC 25923 and E. coli ATCC 25922. On the basis of the various physico chemical studies, a distorted octahedral geometry is suggested for all the dioxomolybdenum (VI) complexes.

Some aspects of the bioinorganic chemistry of molybdenum

Abstract: The biological role of molybdenum, biophysical studies of the molybdenum atoms in molybdo-enzymes, and aspects of coordination chemistry that bear on the understanding of molybdo-enzymes.

Studies on the reactivity of oxodihalobis(diethyldithiocarbamato) molybdenum(VI) and tungsten(VI) complexes

Abstract: The complexes OMoX 2 L 2 (L = S 2 )CNEt 2 ) 2 react with Na 2 S 2 O 4 to yield OMoL 2 (X = Cl), with PhNCO to yield (PhN)MoX 2 L 2 (X = Cl), with PPh 2 Et to give MoX 2 (PPh 2 Et)L 2 (X = Cl, Br), and with OMol 2 to produce OMoXL 2 (X = Cl, Br). The epr spectra of OMoXL 2 display halogen superhyperfine splitting [A( 35,37 Cl) = ∼3 gauss; A(bb]79,81Br) = 12.3 gauss). Reaction of WCl 6 with NaL in MeOH yields the new complex OWCl 2 L 2 which either does not react at all or gives no characterizable products with the above reagents. The results demonstrate the lack of atom transfer ability of tungsten(VI) relative to its molybdenum analog.