Browsing by Subject "Complexation"

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 ...