193672-84-3Relevant academic research and scientific papers
Luminescent Tungsten(VI) Complexes: Photophysics and Applicability to Organic Light-Emitting Diodes and Photocatalysis
Yeung, Kwan-Ting,To, Wai-Pong,Sun, Chenyue,Cheng, Gang,Ma, Chensheng,Tong, Glenna So Ming,Yang, Chen,Che, Chi-Ming
supporting information, p. 133 - 137 (2016/12/30)
The synthesis, excited-state dynamics, and applications of two series of air-stable luminescent tungsten(VI) complexes are described. These tungsten(VI) complexes show phosphorescence in the solid state and in solutions with emission quantum yields up to 22 % in thin film (5 % in mCP) at room temperature. Complex 2 c, containing a 5,7-diphenyl-8-hydroxyquinolinate ligand, displays prompt fluorescence (blue–green) and phosphorescence (red) of comparable intensity, which could be used for ratiometric luminescent sensing. Solution-processed organic light-emitting diodes (OLEDs) based on 1 d showed a stable yellow emission with an external quantum efficiency (EQE) and luminance up to 4.79 % and 1400 cd m?2respectively. These tungsten(VI) complexes were also applied in light-induced aerobic oxidation reactions.
Bimetallic salen aluminum complexes: Cooperation between reactive centers in the ring-opening polymerization of lactides and epoxides
Isnard, Florence,Lamberti, Marina,Lettieri, Luana,D'Auria, Ilaria,Press, Konstantin,Troiano, Rubina,Mazzeo, Mina
supporting information, p. 16001 - 16010 (2016/10/22)
Three dinuclear aluminum alkyl complexes of the general formula LAl2Me4, where L are salen ligands with an alkyl backbone of different lengths between the nitrogen atoms (1,3-propylene (1), 1,5-pentylene (2) and 1,12-dodecaylene (3)), have been prepared through alkane elimination reactions between each ligand and two equivalents of AlMe3. The related hemi-salen aluminum complex 4 was prepared by an analogous reaction between a phenoxy-imine ligand and a single equivalent of AlMe3. The activities of these aluminum complexes in the ring-opening polymerization (ROP) of rac-lactide and of several epoxides have been investigated and compared. The dinuclear complex 1, bearing the salen ligand with the shortest alkyl bridge, was the most active in the ROP of LA producing isotactic enriched PLA. Otherwise, the other complexes (2 and 3), in which the metal centers are remote, produced atactic PLA with inferior activity. Analogous differences in terms of activity emerged in the ROP of epoxides. The comparison of the catalytic behavior of the dinuclear complexes as well as their mononuclear counterparts suggests the cooperation between the two aluminum metal centers of the dinuclear species in which these are close enough.
Synthesis, spectroscopy, and electrochemistry of copper(II) complexes with N,N′-bis(3,5-di-t-butylsalicylideneimine) polymethylenediamine ligands
Kasumov, Veil T.,Koeksal, Fevzi
, p. 225 - 231 (2007/10/03)
Bulky salen CuLx derived from aliphatic polymethylene diamines, H2N-(CH2)x-NH2, where n = 2-6, and 3,5-di-t-butylsalicylaldehyde (H2Lx) and some corresponding tetrahydrosalan complexes (CuL′x) have been synthesized and characterized by their IR, UV - vis absorption and EPR spectra, by magnetic moments and by cyclic voltammetry in acetonitrile (for H 2Lx) and DMF (for CuLx). Complexes CuL x and CuL′x are magnetically normal (μexp = 1.83-1.91 μB). EPR spectra CuLx characterized by the axial g and ACu, tensors with g∥ > g⊥ and without 14N-shf resolution in CHCl3/toluene at 300 and 150K. The CV studies on acetonitrile solutions of H2L x revealed a well-defined quasi-reversible redox wave at E 1/2 = 0.95-1.15 V versus Ag/AgCl but CV of the CuLx complexes in DMF exhibit weak pronounced irreversible oxidation waves at E pa1, = 0.51 - 0.98 V and Epa1 = 1.16 - 1.33 V attributable to metal centered Cu(II/III) and ligand centered CuL x/CuLx+ couples, respectively. A poorly defined wave was observed for the quasi-reversible reduction Cu(II)/Cu(I) at potentials less than - 1.0 V.
