On September 8, 2020, Yang, Wenbo; Sukhanov, Andrei A.; Lim, Jong Hyeon; Li, Xiaoxin; Meng, Yinshan; Zhao, Jianzhang; Sun, Haoling; Lee, Jin Yong; Gurzadyan, Gagik G.; Voronkova, Violeta K. published an article.Recommanded Product: 102-07-8 The title of the article was N^N Pt(II) Bisacetylide Complexes with Oxoverdazyl Radical Ligands: Preparation, Photophysical Properties, and Magnetic Exchange Interaction between the Two Radical Ligands. And the article contained the following:
To study the effect of a stable radical on the photophys. properties of a phosphorescent Pt(II) coordination framework and the intramol. magnetic interaction between radical ligands in the N^N Pt(II) bisacetylide complexes, authors prepared a series of N^N Pt(II) bis(acetylide) complexes with oxoverdazyl radical acetylide ligands. The linker between the Pt(II) center and the spin carrier was systematically varied, to probe the effect on the sign and magnitude of the spin exchange interactions between the radical ligands and photophys. properties. The complexes were studied with steady-state and femtosecond/ns transient absorption spectroscopy, continuous-wave ESR spectroscopy, and d. functional theory (DFT) computations. The transient absorption spectral studies show that the doublet excited state of the radicals are short-lived (τD ≈ 2 ps) and nonfluorescent. Moreover, the intrinsic long-lived triplet excited state (τT = 1.2μs) of the Pt(II) coordination center was efficiently quenched by the radical (τT = 6.9 ps for one representative radical Pt(II) complex). The intramol. magnetic interaction between the radical ligands through the diamagnetic Pt(II) atom was studied with temperature-dependent EPR spectroscopy; antiferromagnetic exchange interaction (-J S1S2, J = -5.4 ± 0.1 cm-1) for the complex with the shortest radical-radical distance through bridge fragments was observed DFT computations give similar results for the sign and magnitude of the J values. For complexes with larger inter-radical distance, however, very weak coupling between the radical ligands was observed (|J| < 0.7 cm-1). The results are useful for the study of the effect of a radical on the photophys. properties of the phosphorescent transition-metal complexes. A series of Pt(II) complexes containing oxoverdazyl radical ligands was prepared The length of the linker between Pt(II) center and spin carrier exerts significant effect on photophys. and magnetic property. The intrinsic long-lived triplet excited state of the Pt(II) coordination center was efficiently quenched by the presence of the radical. Antiferromagnetic interaction between the two radical ligands was observed The sign and the magnitude of the electronic spin-spin exchange was reproduced with DFT computations. The experimental process involved the reaction of 1,3-Diphenylurea(cas: 102-07-8).Recommanded Product: 102-07-8
The Article related to oxoverdazyl radical platinum bisacetylide preparation mol structure calculation electrochem, photophys magnetic exchange oxoverdazyl radical platinum bisacetylide complex and other aspects.Recommanded Product: 102-07-8
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