نتایج جستجو برای: nitrogen donor ligands
تعداد نتایج: 285320 فیلتر نتایج به سال:
Evidence of several types has accumulated that cytochrome P-450 has a thiolate anion as one of the axial ligands to heme (the fifth ligand). On the other hand, there is as yet no general agreement on the nature of the axial ligand trans to thiolate (the sixth ligand), although nitrogen and oxygen have been proposed. To resolve the controversy, the ligand exchange reactions of cytochrome P-450 w...
Nitrogen fixation is an essential process that biologically transforms atmospheric dinitrogen gas to ammonia, therefore compensating for nitrogen losses occurring via denitrification and anammox. Currently, inputs and losses of nitrogen to the ocean resulting from these processes are thought to be spatially separated: nitrogen fixation takes place primarily in open ocean environments (mainly th...
Amido rotation in the chromium(vi), d(0)-system NCr(NPr(i)2)2X is under investigation as a method for the parameterization of ligands for their donor properties toward high valent metals. In this study, two new series were prepared and studied based on chalcogenide ligands, X = EBu(t) and EPh and where E = O, S, Se, Te; the OPh and SPh compounds were previously reported. The ligand donor parame...
In the present study, steady-state, picosecond time-resolved fluorescence and polarization gated anisotropy have been used to establish simultaneous binding of an intercalator (ethidium bromide, EtBr) and a minor groove binder (Hoeschst 33258, H258) to a dodecamer DNA of specific sequence. The Förster resonance energy transfer (FRET) studies between the dyes H258 (donor) and EtBr (acceptor) in ...
Complexes with bulky hydrotris(triazolyl)borate (Ttz) ligands, TtzCuCO, were used to probe how acids change the donor properties of Ttz ligands. (Ttz(tBu,Me))CuCO shows four distinct protonation states and a gradual increase in the CO stretch. The increased electrophilic nature of the Cu center upon protonation leads to enhanced C-H activation catalysis.
Denitrification, anammox (Anx) and di-nitrogen fixation were examined in two mangrove ecosystems- the anthropogenically influenced Divar and the relatively pristine Tuvem. Stratified sampling at 2 cm increments from 0 to 10 cm depth revealed denitrification as the main process of N₂ production in mangrove sediments. At Divar, denitrification was ∼3 times higher than at Tuvem with maximum activi...
The present study aims to synthesis and full characterization of two new pentacoordinated isothiocyanate iron(III) mixed ligand complexes featuring dianionic (N2O2)2? tetradentate Schiff-base ligands unsymmetrically substituted by either a pair acceptor (4-fluorophenyl nitro) or donor (ferrocenyl methoxy) substituents. neutral complexes3 4 were prepared in very good yields (~90 %) upon reaction...
Reaction of three phenolate ligands, viz. 2,4,6-tribromophenol (HL, where H stands for the phenolic proton), 2-nitrophenol (HL) and 2,4,6-trinitrophenol (HLO), with [Ru(PPh3)3Cl2] in a 2:1 molar ratio in the presence of a base gives complexes of type [Ru(PPh3)2(L)2] (L=L , L and L). The 2,4,6-tribromophenolate ligand (L) binds to ruthenium as a bidentate O,Br-donor, while the 2-nitrophenolate l...
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