Femtosecond time-resolved absorption spectroscopy has been used to elucidate the excited-state dynamics associated with formation of the (2)E excited state in a Cr(III) transition metal complex. Cr(acac)(3) (where acac is the deprotonated monoanion of acetylacetone) exhibits monophasic decay kinetics with tau = 1.1 +/- 0.1 ps following excitation into the lowest-energy ligand-field absorption b...

Six new complexes of the type trans-[LCo((DO)(DOH)pn)L'] where (DO)(DOH)pn= N2, N2'-propanediolbis (2,3-butanedione 2-imine 3-oxime), L-Cl¯ and L'=mono-anaion of phenylcyanamide (pcyd), 2,5-dichlorophenylcyanamide (2,5-Cl2 pcyd), 2,4-dimethyl pehylcyanamide (2,4-Me2 pcyd) and L=L'=pcyd, 2,5-Cl2 pcyd, 2,4-Me2 pcyd, have been s...

Photoactive cetyltrimethylammonium bromide-oleic acid (CTAB-OA) bilayer coated iron oxide nanocrystals (IONCs) were precisely synthesized and demonstrated for photo-enhanced hexavalent chromium (Cr(VI)) treatment. For these materials, an outward facing, CTAB layer offers specific affinity Cr(VI), while the core IONC (8–25 nm, as Fe3O4 single domain) surface participates in Fe(II)/Fe(III) redox ...

The segmental tris-tridentate ligand L7 reacts with stoichiometric quantities of Ln(III) (Ln=La-Lu) in acetonitrile to give the complexes [Ln(2)(L7)(3)](6+) and [Ln(3)(L7)(3)](9+). Formation constants point to negligible size-discriminating effects along the lanthanide series, but Scatchard plots suggest that the self-assembly of the trimetallic triple-stranded helicates [Ln(3)(L7)(3)](9+) is d...

A series of four-coordinate square-planar nickel(II) complexes of o-phenylenebis(N'-methyloxamidate)(L1) and related o-phenylene(N'-methyloxamidate)oxamate (L2) and o-phenylenebis(oxamate)(L3) tetradentate ligands have been synthesized and characterized structurally, spectroscopically and electrochemically. The parent nickel(II)-L1 complex presents an intense MLCT band in the UV region (lambda ...

Chelate complexes of Fe have been studied over the years for their ability to behave as both oxidants and antioxidants of dioxygen, as well as potential catalysts for the reduction of NO to dinitrogen. However, the first systematic study of the ligandmetal-substrate has only been done recently by Schenppensieper et al. Interestingly, they found a direct correlation of NO binding and dioxygen bi...

The X-ray crystal structure of a mixed-ligand bimetallic ruthenium(II) complex of composition [(bipy)(2)Ru(H(2)Impib)Ru(bipy)(2)](ClO(4))(4) (1), where H(2)Impib = 1,3-di(1H-imidazo[4,5-f][1,10]phenanthroline-2-yl)benzene and bipy = 2,2'-bipyridine, has been determined and showed that the compound crystallized in monoclinic form with the space group P2(1)/c. The absorption, steady state and tim...