26482-00-8Relevant articles and documents
pH-Dependent ion permeability control of a modified amphotericin B channel through metal complexation
Koshiyama, Tomomi,Inoue, Yuki,Asada, Sana,Kawahara, Koki,Ide, Shogo,Yasuhara, Kazuma,Ohba, Masaaki
, p. 2895 - 2898 (2021)
Amphotericin B incorporating 2,2'-bipyridine (bpy-AmB) forms a membrane channel exhibiting pH-dependent Ca2+ion permeability with a selective response to Cu2+ions. The coordination structure at bpy sites depends on the pH and metal ions can control the association state of bpy-AmB in the membrane.
The parent tetrathiafulvalene-terpyridine dyad: Synthesis and metal binding properties
Belhadj, Esmah,El-Ghayoury, Abdelkrim,Mazari, Miloud,Sallé, Marc
, p. 3051 - 3054 (2013)
The still unknown parent tetrathiafulvalene-terpyridine- ligand 5 (namely TTF-terpy), was synthesized through a straightforward strategy. The dyad exhibits an intramolecular charge transfer (ICT) which was evidenced by UV-vis electronic absorption. Complexation of various transition metal cations by this redox-active ligand was studied by UV-vis absorption spectroscopy as well as by cyclic voltammetry titration studies, supporting the dual functional character of this system. In addition, these results demonstrate that ligand 5 is a suitable building block for the preparation of electroactive neutral as well as charged metal complexes.
Synthesis, spectral and third-order nonlinear optical properties of terpyridine Zn(II) complexes based on carbazole derivative with polyether group
Kong, Ming,Liu, Yanqiu,Wang, Hui,Luo, Junshan,Li, Dandan,Zhang, Shengyi,Li, Shengli,Wu, Jieying,Tian, Yupeng
, p. 521 - 528 (2015)
Four novel Zn(II) terpyridine complexes (ZnLCl2, ZnLBr 2, ZnLI2, ZnL(SCN)2) based on carbazole derivative group were designed, synthesized and fully characterized. Their photophysical properties including absorp
Direct base-assisted C-H cyclonickelation of 6-phenyl-2,20-bipyridine
H?rner, Gerald,Klein, Axel,Sandleben, Aaron,Sivchik, Vasily,Vogt, Nicolas
, (2020)
The organonickel complexes [Ni(Phbpy)X] (X = Br, OAc, CN) were obtained for the first time in a direct base-assisted arene C(sp2)–H cyclometalation reaction from the rather unreactive precursor materials NiX2 and HPhbpy (6-phenyl-2,2
Multidrug resistance regulators (MDRs) as scaffolds for the design of artificial metalloenzymes
Bersellini, Manuela,Roelfes, Gerard
, p. 3069 - 3073 (2017)
The choice of protein scaffolds is an important element in the design of artificial metalloenzymes. Herein, we introduce Multidrug Resistance Regulators (MDRs) from the TetR family as a viable class of protein scaffolds for artificial metalloenzyme design. In vivo incorporation of the metal binding amino acid (2,2-bipyridin-5yl)alanine (BpyA) by stop codon suppression methods was used to create artificial metalloenzymes from three members of the TetR family of MDRs: QacR, CgmR and RamR. Excellent results were achieved with QacR Y123BpyA in the Cu2+ catalyzed enantioselective vinylogous Friedel-Crafts alkylation reaction with ee's up to 94% of the opposite enantiomer that was achieved with other mutants and the previously reported LmrR-based artificial metalloenzymes.
Vibrational, structural and electronic study of a pyridinium salt assisted by SXRD studies and DFT calculations
Labra-Vázquez, Pablo,Palma-Contreras, Miguel,Santillan, Rosa,Farfán, Norberto
, p. 156 - 162 (2017)
The molecular structure of 1-[2-oxo-2-(2-pyridinyl)ethyl]pyridinium iodide (C12H11IN2O) is discussed using an experimental (FT-IR/ATR, NMR, SXRD) and theoretical (DFT, B3LYP/6-311G**) approach. Compound 2 crystallized in the monoclinic P21/c space group with 4 molecules per unit cell and unit cell dimensions a?=?7.5629?? (3), b?=?21.5694?? (7), c?=?7.8166?? (3). The crystal packing is governed by ion-dipole contacts and π-π stacking. High electrostatic potential at the ethanone hydrogens was derived from DFT calculations, further explaining the acidity and reactivity of the molecule as a Michael donor.
Photoinduced electron transfer in a triad that can be assembled/disassembled by two different external inputs. Toward molecular-level electrical extension cables
Ballardini, Roberto,Balzani, Vincenzo,Clemente-Leon, Miguel,Credi, Alberto,Teresa Gandolfi, Maria,Ishow, Elena,Perkins, Julie,Fraser Stoddart,Tseng, Hsian-Rong,Wenger, Sabine
, p. 12786 - 12795 (2002)
We have designed, synthesized, and investigated a self-assembling supramolecular system which mimics, at a molecular level, the function performed by a macroscopic electrical extension cable. The system is made up of three components, 12+, 2-H
Design and synthesis of a squaraine based near-infrared fluorescent probe for the ratiometric detection of Zn2+ ions
Huang, Yangwei,Lin, Qian,Wu, Jiaming,Fu, Nanyan
, p. 699 - 704 (2013)
A squaraine based ratiometric near-infrared fluorescent probe with bipyridyl binding arms for Zn2+ (SQ-1) has been designed and synthesized. SQ-1 exhibits a selective fluorogenic response to Zn2+ in acetone by a 22 nm red-shift and a remarkable enhancement of the fluorescence intensity. Further study shows that the calculated detection limit for Zn 2+ is 6.1 × 10-8 M (3σ/k) and the identification for Zn2+ will not be impacted by competing ions such as Na+, K+, Mg2+, Ca2+, Pb 2+, Mn2+, Ba2+ and Hg2+. The binding mode between SQ-1 and Zn2+ has also been discussed.
Role of the X Coligands in Cyclometalated [Ni(Phbpy)X] Complexes (HPhbpy = 6-Phenyl-2,2′-bipyridine)
Chin, Mason T.,H?rner, Gerald,Klein, Axel,Kletsch, Lukas,Sandleben, Aaron,Sch?fer, Sascha,Vicic, David A.,Vogt, Nicolas
supporting information, p. 1776 - 1785 (2021/06/28)
The coligand X was varied in the organonickel complexes [Ni(Phbpy)X] (X = F, Cl, Br, I, C6F5) carrying the anionic tridentate CNN ligand 6-(phen-2-ide)-2,2′-bipyridine (Phbpy-) to study its effect on electronic structures of these complexes and their activity in Negishi-like C-C cross-coupling catalysis. The complexes were synthesized from the precursor [Ni(COD)2] (COD = 1,5-cyclooctadiene) by chelate-assisted oxidative addition into the phenyl C-X bond of the protoligand 6-(2-halidophenyl)-2,2′-bipyridine) and were obtained as red powders. Protoligands X-Phbpy carrying the halide surrogates X = OMe, OTf (triflate) failed in this reaction. Single-crystal XRD allowed us to add the structures of [Ni(Phbpy)Cl] and [Ni(Phbpy)I] to the previously reported Br derivative. Cyclic voltammetry showed reversible reductions for X = C6F5, F, Cl, while for Br and I the reversibility is reduced through rapid splitting of X- after reduction (EC mechanism). UV-vis spectroelectrochemistry confirmed the decreasing degree of reversibility along the series C6F5 > F > Cl ? Br > I, which parallels the "leaving group character"of the X coligands. This method also revealed mainly bpy centered reduction and essentially Ni(II)/Ni(III) oxidations, as corroborated by DFT calculations. The rather X-invariant long-wavelength UV-vis absorptions and excited states were analyzed in detail using TD-DFT and were consistent with predominant metal to ligand charge transfer (MLCT) character. Initial catalytic tests under Negishi-like conditions showed the complexes to be active as catalysts in C-C cross-coupling reactions but did not display marked differences along the series from Ni-F to Ni-I.
Aggregation induced emission (AIE) active 4-amino-1,8-naphthalimide-Tr?ger's base for the selective sensing of chemical explosives in competitive aqueous media
Delente, Jason M.,Gunnlaugsson, Thorfinnur,Kotova, Oxana,Shanmugaraju, Sankarasekaran,Umadevi, Deivasigamani,Watson, Graeme W.
supporting information, p. 2562 - 2565 (2020/03/10)
The 4-amino-1,8-naphthalimide-Tr?ger's base fluorophore, TBNap-TPy, adorned with phenyl-terpyridine moiety was synthesised and assessed for its aggregation-induced emission (AIE) behaviour. TBNap-TPy was further employed as a fluorescent sensor for the di
