Photophysical properties of europium (Eu(III)) complexes are affected by ligand-to-metal charge transfer (LMCT) states. Two luminescent Eu(III) with three tetramethylheptadionates (tmh) and pyridine (py), [Eu(tmh)3(py)1] (seven-coordinated monocapped-octahedral structure) [Eu(tmh)3(py)2] (eight-coordinated square antiprismatic structure), were synthesized for geometrical-induced LMCT level cont...

Two light-induced spin-crossover Fe(III) compounds have been studied with time-dependent density functional theory (TD-DFT) to investigate the deactivation mechanism and the role of the ligand-field states as intermediates in this process. The B3LYP* functional has previously shown its ability to accurately describe (light-induced) spin-crossover in Fe(II) complexes. Here, we establish its perf...

Abstract NH 2 -UIO66 (NU) is a promising photocatalyst for the reduction of Cr(VI) to low-toxic Cr(III) driven by visible light under ambient conditions. However, main limitation in this process inefficient ligand metal charge transfer (LMCT) photo-excited electrons, which caused inherent energy gap (? E LMCT ). This study synthesized defective NU (NUX-H, where X molar equivalent modulator) wit...

Europium tris-b-diketonates (Eu(L)3 nH2O) show concentration quenching of luminescence in toluene solutions due to the formation of weakly luminescent dimers. Addition of water to the concentrated toluene solutions of Eu(L)3 nH2O unexpectedly enhances quantum yield ðfÞ and lifetime of Eu 3+ luminescence by causing dissociation of dimers and by reducing quenching of excited Eu through the ligand...

Z. Naturforsch. 51 b, 1067-1071 (1996); received March 8, 1996 Myochrysin, Auranotin. Gold(I) Complexes, Photochemistry, Luminescence Myochrysin (sodium aurothiomalate hydrate) and auranofin [2,3.4,6-tetra-O-acetyl-l-thio-ßD-glucopyranosato-S)(triethylphospine)gold(I)] are luminescent in the solid state and in ethanol glasses at 77 K (myochrysin: Amax = 600 nm; auranofin: 618 nm). Aqueous myoch...

The recently developed technique of femtosecond stimulated Raman spectroscopy, and its variant, femtosecond Raman-induced Kerr effect spectroscopy (FRIKES), offer access to ultrafast excited-state dynamics via structurally specific vibrational spectra. We have used FRIKES to study the photoexcitation dynamics of nickel(II) phthalocyanine with eight butoxy substituents, NiPc(OBu)8. NiPc(OBu)8 is...

Ligand-to-metal charge transfer (LMCT) photocatalysis allows the activation and synthetic utilization of halides other heteroatoms in metal complexes. Many metals are known to undergo LMCT but so far remain underutilized field catalysis. A screening assay identifying activity helped us expand this catalysis concept application bismuth organic radical coupling reactions. We demonstrate its for g...

The electronic spectra o f bromo complexes o f main group metal ions with an s2 electronic configuration (SnBr3~, PbBr3~, PbBr42_, SbBr4~, SbBr63~, BiBr4~, BiBr63~) in acetonitrile show long-wavelength absorption bands which are assigned to metal-centered sp transitions. Com­ pared to the corresponding chloro complexes the sp bands o f the bromo complexes appear at longer wavelength due to sp/L...

In the present paper [VO(acac)2] reacts with an equimolar amount of tridentate dibasic ONO donor hydrazone ligand derived from the condensation of benzoyl hydrazine with either 2hydroxyacetophenone (H2L 1) or its para-substituted derivatives (H2L 2) (general abbreviation H2L), in the presence of excess amount of salicylaldehyde (Hsal) in methanol under aerobic conditions producing the mixed-lig...

Abstract Despite the rich photochemistry of 3d‐metal complexes, utilization excited‐state reactivity these compounds in organic synthesis has been historically overlooked. The advent photoredox catalysis changed perception synthetic chemists towards photochemistry, and nowadays potential photoinduced, outer‐sphere single‐electron transfer events is widely recognized. More recently, an emerging ...