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Browsing by Subject "Complexation"

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    • Article  

      Alcoholysis/hydrolysis of 1,1′-carbonyldiimidazole as a means of preparing unprecedented, imidazole-containing one-dimensional coordination polymers of copper(II) 

      Stamatatos, Theocharis C.; Perlepes, Spyros P.; Raptopoulou, Catherine P.; Terzis, Aris; Patrickios, Costas S.; Tasiopoulos, Anastasios J.; Boudalis, Athanassios K. (2009)
      The use of 1,1′-carbonyldiimidazole, (im)2CO, for the synthesis of imidazolate (im-) and/or imidazole (Him)-containing copper(II) coordination polymers is described. The [Cu2(O 2CMe)4(H2O)2]/(im)2CO reaction system in EtOH ...

    • Article  

      Competitive sorption of Cu(II) and Eu(III) ions on olive-cake carbon in aqueous solutions - A potentiometric study 

      Konstantinou, M.; Pashalidis, Ioannis (2010)
      The competitive sorption of Cu(II) and Eu(III) ions from aqueous solutions by olive-cake carbon, has been investigated by potentiometry at pH 6, I = 0.1 M NaClO4, 25°C and under normal atmospheric conditions. Evaluation ...

    • Article  

      Competitive sorption of Cu(II), Eu(III) and U(VI) ions on TiO2 in aqueous solutions-A potentiometric study 

      Konstantinou, M.; Pashalidis, Ioannis (2008)
      The competitive sorption of Cu(II), Eu(III) and U(VI) ions in aqueous solutions by TiO2, has been investigated by potentiometry at I = 0.1 M NaClO4, 25 °C and under atmospheric conditions. For Cu(II) ions the investigation ...

    • Article  

      Cyclisation chemistry of 4H-1,2,6-thiadiazines 

      Koutentis, Panayiotis Andreas; Rees, C. W. (2000)
      3,5-Dichloro-4H-1,2,6-thiadiazin-4-one 1 condenses rapidly at room temperature with 1,2-diaminobenzene, 2-aminothiophenol and sodium 2-aminophenoxide to give, respectively, the purple thiadiazinoquinoxaline 4a, red ...

    • Article  

      Direct observation of excitons in polymer/carbon nanotube composites at room temperature: The influence of nanotube concentration 

      Lioudakis, Emmanouil E.; Kanari, C.; Othonos, Andreas S.; Alexandrou, Ioannis (2008)
      In this work, we have employed spectroscopic ellipsometry technique to study the optical properties of polymer/carbon nanotube (CN) composites as a function of nanotube concentration. Using a two-layer structural model ...

    • Article  

      Electroluminescence from a volatile europium complex 

      Stathatos, Elias; Panayiotidou, L.; Lianos, P.; Keramidas, Anastasios D. (2006)
      Three new strongly chelating heterocyclic ligands containing pyridine, imidazole and triazine rings have been used to make ternary complexes of Europium(III) ions together with trifluoroacetylacetonate. The complex containing ...

    • Article  

      Inducing single-molecule magnetism in a family of loop-of-loops aggregates: Heterometallic Mn40Na4 clusters and the homometallic Mn44 analogue 

      Moushi, Eleni E.; Lampropoulos, Christos; Wernsdorfer, W.; Nastopoulos, Vassilios; Christou, George; Tasiopoulos, Anastasios J. (2010)
      The syntheses, crystal structures, and magnetic properties of a new family of heterometallic Mn40Na4 and homometallic Mn44 loop-of-loops aggregates are reported. The reactions of [Mn3O(O 2CMe)6(py)3]•py with 1,3-propanediol ...

    • Article  

      Interaction of metal complexes with G-quadruplex DNA 

      Georgiades, Savvas N.; Abd Karim, N. H.; Suntharalingam, K.; Vilar, R. (2010)
      [Figure Presented] Guanine-rich sequences of DNA can assemble into tetrastranded structures known as G-quadruplexes. It has been suggested that these secondary DNA structures could be involved in the regulation of several ...

    • Article  

      Lattice thermal conductivity of K 2(Bi 1-zSb z) 8Se 13 solid solutions 

      Kyratsi, Theodora; Hatzikraniotis, E.; Paraskevopoulous, M.; Dyck, J. S.; Shin, H. K.; Uher, C.; Kanatzidis, M. G. (2004)
      The influence of the Bi/Sb partial substitution to the lattice thermal conductivity of the K 2(Bi 1-zSb z) 8Se 13 solid solution series was studied. The variation of the lattice thermal conductivity with comparison was ...

    • Article  

      Mixed Transition-Metal - Lanthanide Complexes at Higher Oxidation States: Heteronuclear CeIV-MnIV Clusters 

      Tasiopoulos, Anastasios J.; O'Brien, T. A.; Abboud, K. A.; Christou, George (2004)
      Wheels within wheels: A new family of mixed cerium(IV)-manganese(IV) clusters has been prepared spanning a range of Ce:Mn ratios from 3:2 to 1:6. The unusual core of the latter CeMn6 complex is shown (Ce green, Mn blue, O ...

    • Article  

      Photochemistry of an azido-functionalized cryptand: Controlling the reactivity of an extremely long-lived singlet aryl nitrene by complexation to alkali cations 

      Bucher, G.; Tönshoff, C.; Nicolaïdes, Andrew N. (2005)
      Photolysis of the cryptand 1, bearing an intraannular azido substituent, results in a complex photochemistry. Low-temperature photolysis yields the triplet nitrene 32, which has been characterized by EPR spectroscopy. Small ...

    • Article  

      Quantitative description and local structures of trivalent metal ions Eu(III) and Cm(III) complexed with polyacrylic acid 

      Montavon, G.; Bouby, M.; Huclier-Markai, S.; Grambow, B.; Geckeis, H.; Rabung, T.; Pashalidis, Ioannis; Amekraz, B.; Moulin, C. (2008)
      The trivalent metal ion (M(III) = Cm, Eu)/polyacrylic acid (PAA) system was studied in the pH range between 3 and 5.5 for a molar PAA-to-metal ratio above 1. The interaction was studied for a wide range of PAA (0.05 mg ...

    • Article  

      Quantitative preparation of 3,4-di(methylene)tetrahydrothiophene-1,1- dioxide by Zn-induced 1,4-debromination. A valuable 6-C reactive diene in [4+2] cycloadditions with DMAD and [60]fullerene 

      Markoulides, Marios Savva; Ioannou, Charalambos P.; Manos, Manolis J.; Chronakis, Nikos (2012)
      Optimum reaction conditions for the quantitative preparation of the highly reactive 3,4-di(methylene)tetrahydrothiophene-1,1-dioxide are described. The method involves the zinc-induced 1,4-debromination of 3,4-bis(bromom ...

    • Article  

      Studies on the interaction of olive cake and its hydrophylic extracts with polyvalent metal ions (Cu(II), Eu(III)) in aqueous solutions 

      Konstantinou, M.; Kolokassidou, K.; Pashalidis, Ioannis (2009)
      The paper presents and discusses the chemical affinity of two different forms of natural organic matter (e.g. in solid (SOM) and soluble form (DOM)) for Cu2+ and Eu3+ ions. In the this study SOM is represented by olive ...

    • Article  

      Unexpected reduction of vanadium(IV) to vanadium(III) in the presence of the chelate ligands 2,2′-bipyridine (bpy) and 1,8-hydroxyquinoline (Hquin) 

      Manos, Manolis J.; Tasiopoulos, Anastasios J.; Raptopoulou, Catherine P.; Terzis, Aris; Derek Woollins, J.; Slawin, A. M. Z.; Keramidas, Anastasios D.; Kabanos, Themistoklis A. (2001)
      The structures, NMR spectra and electrochemical properties of the vanadium(III) compounds, cis-[VIIICl2-(acac)(bpy)] and [VIII(quin)3]·2CH3OH, formed from [VIVCl2(acac)2]·0.25CH2Cl 2 (Hacac = pentane-2,4-dione) and ...

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