Synthesis, luminescence and cyclic voltammetric studies of several novel carboxylato diruthenium complexes

Abstract

New nonpolymeric diruthenium (II, III) carboxylates of the type [Ru 2 (l-O 2 CR) 4 Cl] [R = 9-methyl-9H-carbazole, 9-phenyl-9H-carbazole, 9-(4-vinylphenyl)-9H-carbazole] were obtained by reaction of HO 2 CR with [Ru 2 (l-O 2 CCH 3 ) 4 Cl] in MeOH-H 2 O. All complexes were characterized by TG, electron spectroscopy, cyclic voltammetry, and ESR spectra. The solvent influence on fluorescence was also discussed. Simultaneously, the electrochemical properties of these complexes were discussed in terms of the most probable electronic configuration of the complexes in solution. The frozen-solution e.s.r. spectra at 110 K give g = 1.94, 1.99, 1.95 for Ru 2 (L 0 ) 4 Cl, Ru 2 (L 1 ) 4 Cl and Ru 2 (L 2 ) 4 Cl, respectively. The complexes in DMF solution exhibited strong two-photon absorption (t.p.a.) at 532 nm nanosecond laser pulse. Their t.p.a. coefficient b, t.p.a. cross-section d have been determined by the Z-scan technique.

In Vitro and in Vivo Anticancer Activity of Copper Bis(thiosemicarbazone) Complexes

“…Ferrocene was used as an internal reference with E 1/2 = 0.64 V (Δ E p = 82 mV; | i pa |/| i pc | = 1.13) in DMF against SCE under similar conditions. The reported E 1/2 for ferrocene is 0.51 V in DMF (1 mM, 0.1 M n Bu 4 NClO 4 , platinum as working and counter electrodes, Ag/AgCl as reference electrode) at 25 °C …”

“…The reported E 1/2 for ferrocene is 0.51 V in DMF (1 mM, 0.1 M n Bu 4 NClO 4 , platinum as working and counter electrodes, Ag/AgCl as reference electrode) at 25 °C. 60 Lipophilicity Measurement. The lipophilicity (log P oct ) was measured in triplicate for Cu(GTSC) and Cu(GTSCHCl) complexes by the standard "shake-flask" method.…”

“…30 Besides its therapeutic utility, it has also shown promise as a positron emission tomography-computed tomography (PET/CT) agent to diagnose the progress of cervical carcinoma and has successfully cleared clinical human trial phase II recently. 31,32 Following the successful story of 64 Cu(ATSM), a number of copper bis(thiosemicarbazone) complexes with different radio- labeled nuclides, 60 Cu, 61 Cu, 62 Cu, and 64 Cu, have been tested as PET/CT imaging agents. 33−37 Recently, we have shown that the ligand bis-(thiosemicarbazone) of glyoxal (GTSCH 2 ) can be used for live cell imaging in conjunction with zinc.…”

Study on the synthesis and structure–effect relationship of multi‐aryl imidazoles with their fluorescence properties

“…Among these compounds, derivatives based on imidazole have drawn considerable attention due to their unique attributes . They not only exhibit traditional fluorescent and phosphorescent characteristics, but also excellent two‐photon absorption properties . These features have already stimulated research in a number of areas, including fundamental photophysical investigations, photographic materials, electroluminescent materials, optical materials, three‐dimensional optical data storage, two‐photon fluorescent microscopy and imaging .…”