Luminescent europium(<scp>iii</scp>) and terbium(<scp>iii</scp>) complexes of β-diketonate and substituted terpyridine ligands: synthesis, crystal structures and elucidation of energy transfer pathways
作者:Zafar Abbas、Srikanth Dasari、María J. Beltrán-Leiva、Plinio Cantero-López、Dayán Páez-Hernández、Ramiro Arratia-Pérez、Ray J. Butcher、Ashis K. Patra
DOI:10.1039/c9nj02838b
日期:——
originating from six oxygen donors of three monoanioninc β-diketonate ligands and three nitrogens from a tridentate terpyridine derivative (R-TPY). We elucidate the energy transfer (ET) pathways from two coordinating antennae moieties (i.e.R-TPY and TTA) in these complexes using relativistic multiconfigurational methods. For this purpose, a theoretical analysis was performed through a method that consists of
New iridium bis‐terpyridine complexes: synthesis, characterization, antibiofilm and anticancer potentials
作者:Cigdem Sahin、Dogukan Mutlu、Farid Nasirli、Ghodrat Mahmoudi、Fedor I. Zubkov、Sevki Arslan、Nazime Mercan Dogan
DOI:10.1007/s10534-021-00307-y
日期:2021.6
This study represents synthesis, characterization, screening of antibiofilm efficacy, and cytotoxicity of iridium bis-terpyridine complexes. The complexes were characterized by NMR, MS, FTIR, UV/Visible, and fluorescence spectroscopies. The efficacy of biofilm inhibition and eradication of iridium complexes was evaluated using a crystal violet assay test and verified by fluorescence microscopy. Cytotoxicity
Preparation and properties of ruthenium (II) complexes of 2,2′:6′,2″-terpyridines substituted at the 4′-position with heterocyclic groups
作者:M. Beley、D. Delabouglise、G. Houppy、J. Husson、J.-P. Petit
DOI:10.1016/j.ica.2005.04.012
日期:2005.7
Four ligands whose general formula is R-terpy with terpy = 2,2':6',2" terpyridine bearing at the 4'-position a substituent R = 2-furyl, 2-pyrrolyl, 2-thienyl and 5-2,2'bithienyl were synthesised. The absorption spectra and the electrochemical behaviour of the corresponding homoleptic Ru(II) complexes were investigated and compared to those of the parent complex [Ru(terpy)](2+). Due to the donor effect of the grafted heterocyclic groups, the absorption and emission maxima are red-shifted and the energy levels of the HOMO Pi(t(2g)) metal orbitals are slightly higher. The incorporation of these heterocyclic moieties extends the electronic delocalisation over the corresponding ligands, leading to higher emission quantum yields. Cyclic voltammetric studies of pyrrolyl-, thienyl- and bithienyl-functionalised complexes show that an electroactive layer can be deposited on the electrode. Preliminary results point out that an electrodeposited film could be used as a photocathode in an aqueous electrolyte. (c) 2005 Elsevier B.V. All rights reserved.
Pyrrole-substituted tridentate complexes of Ru(II): Spectroscopy, electrochemistry, photosensitization and the role of orbital mixing
作者:Mona Abboud、Daria Kalinina、Pierre G. Potvin
DOI:10.1016/j.ica.2009.07.035
日期:2009.11
One-step syntheses are reported of 4'-(pyrrol-2-yl)-2,2'; 6',2 ''-terpyridine, 4-(pyrrol-2-yl)-2,6-di(pyrazol-2-yl)pyridine and of their homoleptic Ru(II) complexes, in good to very good yields. DFT calculations con. firmed that the pyrrole rings lay coplanar with the tridentate cores and constituted effective pi-donors, but also showed that the properties of the Ru(II) complexes defied classical analyses based on localized metal- or ligand-centred orbitals. The low-potential electrochemical oxidations led to electropolymerization but were not purely pyrrole-centred. The low-energy electronic spectral absorptions were not purely metal-to-ligand charge transfer (MLCT) in character, but resulted from mixed metal- to-ligand and intraligand transitions. The complexes' photosensitization abilities showed that the pyrrole groups were beneficial to the survival of the photoexcited states, albeit not as much as p-tolyl groups. (c) 2009 Elsevier B.V. All rights reserved.
Kinetically labile ruthenium(<scp>ii</scp>) complexes of terpyridines and saccharin: effect of substituents on photoactivity, solvation kinetics, and photocytotoxicity
作者:Priyaranjan Kumar、Prerana Singh、Sanjoy Saren、Sandip Pakira、Sri Sivakumar、Ashis K. Patra
DOI:10.1039/d1dt00246e
日期:——
solvents (e.g. DMSO/DMF). The complexes undergo the ligand-substitution reaction, and their speciation and kinetics were studied by UV-Vis, ESI-MS, 1H-NMR, and structural analysis. We also attempted to assess the effect of various substituents on the ancillary terpyridine ligand (R-tpy) in photo-reactivity and ligand-exchange reactions. The photo-induced absorption and emission measurements suggested dissociation