✍ Scribed by J. šima; A. Kotočová; R. Germuša; P. Kubát; P. Engst
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The complexes cis‐[Co(N~2~O~2~)(acac)], (where N~2~O~2~ = tetradentate dianionic open‐chain ligands of acacen, salen or benacen‐type; acac = 2,4‐pentadionate anion) undergo photoredox reactions under the influence of ultraviolet radiation giving rise to Co(II). The quantum yield values of the Co(III) reduction, associated with the oxidation of the acac ligand, depend on the periphery (substituents R) of the N~2~O~2~‐ligands and the wavelength of incident light. The complexes are luminescent from their intraligand excited states.
In acetonitrile solution the complexes exhibit an electrochemical oxidation response (E~pa~: 0.86 to 1,02 V vs SCE) of primarily ligand oxidation origin. A linear correlation has been obtained between the anodic peak potential, E~pa~ and the inductive parameter,σ of the substituents R. The electrochemical reduction of the complexes was poorly resolved or missing within the solvent limit.
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**The first photoluminescing dinitrogen complex** __trans__‐(N~2~)~2~W(diphos)~2~ __(1)__ is also the first transition‐metal(o) compound to show a structured emission spectrum. These finding are of considerable significance for the photochemical reduction of complexed N~2~.
The syntheses, structures, and spectroscopic properties are According to the 1 H-and 13 C-NMR and resonance Raman spectra the imine groups of the iPr-DAB ligand are reported for trans,cis and cis,cis isomers of [Ru(I)(Me)(CO) 2 (α-diimine)] [α-diimine = N,NЈ-diisopropyl-inequivalent in the cis,cis i
One metalorganic complex [K(cis-syn-cis-dicyclohexyl-18-crown-6)] 2 [Cu(mnt) 2 ] (mnt = maleonitriledithiolate) has been obtained by the reaction of dicyclohexyl-18-crown-6 with K 2 mnt and CuCl 2 •2H 2 O. The title complex has been characterized by elementary analysis, FT-IR, UV-Vis spectroscopy an
The photophysical, photochemical and redox properties of the title complexes were investigated. Resonance Raman measurements revealed the lowest-energy electronic transition to possess σǞπ\* character. At low temperatures, longlived near-IR emission was observed. Irradiation in solution results in h