Themed collection Spectroscopy of Inorganic Excited States

Welcome to this Dalton Transactions themed issue on Spectroscopy of Inorganic Excited States.

This perspective offers an overview of the recent studies on the Kerr effects, time-resolved electron paramagnetic resonance (TREPR) and magneto-chiral dichroism (MChD) of a range of porphyrinic compounds.

Recent works devoted to the investigation of ultrafast processes for several environmentally important Fe(III) carboxylates were observed and discussed.

This Perspective discusses applications of ultrafast transient 2D-IR spectroscopy methods to the study of inorganic excited states.

Excited states and their interactions in low-spin and high-spin non-heme ferryl active sites are probed by low-temperature magnetic circular dichroism spectroscopy providing mechanistic insight into enzymatic functions.

Herein we present a new and promising approach for the high-resolution modeling of vibrational resonance Raman spectra of metal complexes in solution.

Excited-state quenching of DNA intercalated [Cr(phen)₂(dppz)]³⁺ by guanine proceeds by rapid forward and back electron transfer of <3 ps.

Excitation of the vibrational modes at the bipyridine ligand results in modulation of the electron transfer rate between the electron donating and accepting ligands in a Re(I) complex.

Charge-transfer excited state branches over 3 pathways on the timescale up to 14 ps.

In this report, we demonstrate how spectroelectrochemistry can be used to help characterize dynamics associated with charge-transfer excited states of transition metal-based chromophores as measured by ultrafast electronic absorption spectroscopy.

Accurate electronic structure calculations of the lowest excited states have been performed on twenty snapshots of a molecular dynamics simulation of [Fe(bpy)₃]²⁺ dissolved in water.

Spin–orbit coupling between metal-centered electronic states can lead to absorption spectra with vibronic structure involving ligand-centered vibrational modes, as theoretically analyzed for Ni(H₂O)₆²⁺.

Temperature dependent excited state iodide oxidation by two heteroleptic Ru polypyridyl compounds was quantified for the first time.

Irradiation of [Ru(bpy)₂(bpSOp)](PF₆)₂ (where bpy is 2,2′-bipyridine and bpSOp is 1,3-bis(phenylsulfinyl)propane) results in the formation of two new isomers, namely the S,O- and O,O-bonded species.

Steady-state and transient structures of a copper diimine dye sensitizer on TiO₂ nanoparticles undergoing photoinduced interfacial electron transfer are determined.

Photoinduced electron transfer reactions in platinum(II) donor–chromophore–acceptor triads were investigated in detail by transient absorption spectroscopy.

Carbazole oligomers with Pt(II)- and Au(I)-acetylide end units exhibit non-linear absorption due to instantaneous two-photon absorption combined with triplet–triplet absorption.

Magnetometry, ¹H-NMR, EPR and substituent effects are used to explain solvent and temperature dependent paramagnetism in [Ru^II(bpy)₂(phendione)](PF₆)₂.

The contribution of different protected bibenzimidazole ligands to the excited state in Ru-complexes has been evidenced using theory-aided resonance-Raman spectroscopy.

The photoinduced ligand exchange and isomerization of ruthenium(II) complexes proceed via a common intermediate for all isomers.

Ultrafast photochemical processes induced in the transition metal azido complexes Rh(Cp*)(N₃)₂(PPh₃) and Ir(Cp*)(N₃)₂(PPh₃) upon laser excitation at 266 nm and 400 nm were elucidated by picosecond time-resolved infrared spectroscopy and density functional theory.

Photoinduced processes of tetrahexylammonium tetrachlorocuprate [(C₆H₁₃)₄N]₂Cu^IICl₄ in chloro-organic solvents were investigated by steady state photolysis and femtosecond transient absorption spectroscopy, as well as TD-DFT calculations of excited terms.

Theoretical “spin-free” (in black) and “spin–orbit” (in red) absorption spectra of [Pt(tpy)Cl]⁺ and electronic densities characterizing the main intense bands MLCT/XLCT at 384 nm, and MLCT/LC at 326 nm and 250 nm (the experimental spectrum is shown in the inset).

Excitation of Pt, Pd, Ni dithione–dithiolates triggers fs solvation-driven charge redistribution and 6 ps ISC.

Picosecond time-resolved infrared measurements and quantum chemical calculations provide insight into the photophysics and photochemistry of (η⁶-arene)Cr(CO)₃ complexes.

Dppz complexes with extended conjugation show π,π* and MLCT excited states in solution. Raman spectral features for the short-lived π,π* state are observed in single-colour transient experiments.

We present the synthesis and characterization of a series of four fluorescent Sn(IV) Schiff base complexes, which also possess long-lived triplet excited states.

Strong cooperative interactions result in light-induced bistability between the high-spin and the low-spin state.

Exciton coupling is applied for the first time to successfully explain the excited-state structure of metalloazadipyrrins.

Femtosecond spectroscopy was applied to study the ultrafast dynamics for the excited states of dithiolate Cu(II) and Ni(II) complexes.

1,2,4-Triazole based boron complexes are readily tunable blue emitters.

Complex 1 exhibits a formally forbidden energy transfer from the metal-based triplet to the fluorescent Bodipy singlet state.

Platinum acetylide complexes featuring NHC-carbene ligands show enhanced photophysical properties relative to complexes with phosphine ligands.

The influence of the (η⁶-arene)₂M (M = Cr, V, Cr⁺) composition on parameters of intravalency and Rydberg transitions is explained on the basis of time-dependent DFT.