6813-38-3Relevant academic research and scientific papers
Synthesis and characterization of cross-linkable ruthenium complex dye and its application on dye-sensitized solar cells
Liu, Ken-Yen,Hsu, Chiao-Ling,Chang, Shun-Hsing,Chen, Jian-Ging,Ho, Kuo-Chuan,Lin, King-Fu
, p. 366 - 372 (2010)
A new crosslinkable light sensitizer, Ru(2,2′-bipyridine- 4,40-bicarboxylic acid)(4,4′-bis(11-dodecenyl)-2,2′-bipyridine)( NCS)2, denoted as Ru-C for titanium oxide nanocrystallinebased solar cells was synthesized with its crosslinking properties invesitigated by Fourier-transform infrared and UV-vis absorption spectroscopies. After crosslinking by itself or copolymerizing with methyacrylic acid, their sensitized solar cells with poly(methylacrylate)-gelled electrolyte system not only attained more than 5% of power conversion efficiency at AM 1.5 illumination (100 mW/cm2), but also gave rise to long storage life. To the best our knowledge, this is the first crosslinkable dye ever applied to the DSSC in the literature.
Magnetic observation of above room-temperature spin transition in vesicular nano-spheres
Luo, Yang-Hui,Liu, Qing-Ling,Yang, Li-Jing,Sun, Yu,Wang, Jin-Wen,You, Chao-Qun,Sun, Bai-Wang
, p. 8061 - 8069 (2016)
Nano-scale materials are acquiring a leading role in the fabrication of new generation devices, especially for the practical application of molecular bi-stability. However, the preparation of purely bi-stable nano-objects without the use of surfactants/polymers remains a challenging task. Here, we present a new approach to prepare spin-crossover (SCO) vesicular nano-spheres with single-external diameters of approximately 100 nm using a CHCl3-H2O mixture. The nano-spheres are based on a series SCO complexes, [Fe(H2Bpz2)2(dialkyl-bipy)] (H2Bpz2 = dihydrobis(1-pyrazolyl)borate, dialkyl-bipy = N4,N4′-dialkyl-(2,2′-bipyridine)-4,4′-dicarbo-xamide, alkyl = propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl and cetyl), and are prepared through a self-assembly process that is similar to liposomal assembly, with the dialkyl-bipy moiety acting as the hydrophobic tail and the Fe(H2Bpz2) moiety acting as the hydrophilic head. This study reveals that the alkyl chain length plays a key role in the formation of these nano-spheres and the determination of their spin transition temperatures. The spin transition temperatures for the bulk materials are centered at around 160 K, and show a positive correlation with the alkyl chain length. Meanwhile, for the vesicular nano-spheres in the solid state, their transition temperatures are above room-temperature, and the correlation with the alkyl chain length is negative. These results provide an effective strategy for the design of new metal-organic materials for nano-technological applications.
Hexameric supramolecular scaffold orients carbohydrates to sense bacteria
Gruenstein, Dan,Maglinao, Maha,Kikkeri, Raghavendra,Collot, Mayeul,Barylyuk, Konstantin,Lepenies, Bernd,Kamena, Faustin,Zenobi, Renato,Seeberger, Peter H.
, p. 13957 - 13966 (2011)
Carbohydrates are integral to biological signaling networks and cell-cell interactions, yet the detection of discrete carbohydrate-lectin interactions remains difficult since binding is generally weak. A strategy to overcome this problem is to create multivalent sensors, where the avidity rather than the affinity of the interaction is important. Here we describe the development of a series of multivalent sensors that self-assemble via hydrophobic supramolecular interactions. The multivalent sensors are comprised of a fluorescent ruthenium(II) core surrounded by a heptamannosylated β-cyclodextrin scaffold. Two additional series of complexes were synthesized as proof-of-principle for supramolecular self-assembly, the fluorescent core alone and the core plus β-cyclodextrin. Spectroscopic analyses confirmed that the three mannosylated sensors displayed 14, 28, and 42 sugar units, respectively. Each complex adopted original and unique spatial arrangements. The sensors were used to investigate the influence of carbohydrate spatial arrangement and clustering on the mechanistic and qualitative properties of lectin binding. Simple visualization of binding between a fluorescent, multivalent mannose complex and the Escherichia coli strain ORN178 that possesses mannose-specific receptor sites illustrates the potential for these complexes as biosensors.
Solid-supported chemiluminescence and electrogenerated chemiluminescence based on a tris(2,2′-bipyridyl)ruthenium(II) derivative
Greenway,Greenwood,Watts,Wiles
, p. 85 - 87 (2006)
We report a simple and efficient technique for the covalent immobilisation of a tris(2,2′-bipyridyl)ruthenium(ii) derivative suitable for both chemiluminescence and electrochemiluminescence detection. The Royal Society of Chemistry 2006.
Synthesis and recognition behaviour of allosteric hemicarcerands
Lützen, Arne,Ha?, Oliver,Bruhn, Torsten
, p. 1807 - 1811 (2002)
Bipyridine bridged bis(resorcinarenes) have been prepared. Upon co-ordinating to a transition metal ion, e.g. Ag+, the respective metal complex forms a hemicarcerand-like structure with the two resorcinarene moieties capable of binding non-polar organic molecules in a co-operative fashion, as shown qualitatively by NMR spectroscopy.
Silver coordination complexes as room-temperature multifunctional materials
Pucci, Daniela,Barberio, Giovanna,Bellusci, Anna,Crispini, Alessandra,Donnio, Bertrand,Giorgini, Loris,Ghedini, Mauro,La Deda, Massimo,Szerb, Elisabeta Ildyko
, p. 6738 - 6747 (2006)
A series of bischelate ionic silver complexes [Ag(L*)2][X] was prepared by complexation of a newly synthesized 2,2′-bipyridine containing chiral alkoxy chains in the 4,4′ positions. The appropriate choice of the construction motifs allows the preparation of new materials in which several functionalities can be introduced.Indeed, when the anion X - is a triflate or a dodecylsulfate group, the right combination of intermolecular interactions promotes the production of liquid crystalline mesophases. Therefore, the presence of coordinating anions, which drives the supramolecular assembly, is essential to generate, at the same time, room-temperature columnar hexagonal mesomorphism, the columnar helical supramolecular structure, and excimeric emission.
Protein Surface Mimetics: Understanding How Ruthenium Tris(Bipyridines) Interact with Proteins
Hewitt, Sarah H.,Filby, Maria H.,Hayes, Ed,Kuhn, Lars T.,Kalverda, Arnout P.,Webb, Michael E.,Wilson, Andrew J.
, p. 223 - 231 (2017)
Protein surface mimetics achieve high-affinity binding by exploiting a scaffold to project binding groups over a large area of solvent-exposed protein surface to make multiple cooperative noncovalent interactions. Such recognition is a prerequisite for competitive/orthosteric inhibition of protein–protein interactions (PPIs). This paper describes biophysical and structural studies on ruthenium(II) tris(bipyridine) surface mimetics that recognize cytochrome (cyt) c and inhibit the cyt c/cyt c peroxidase (CCP) PPI. Binding is electrostatically driven, with enhanced affinity achieved through enthalpic contributions thought to arise from the ability of the surface mimetics to make a greater number of noncovalent interactions than CCP with surface-exposed basic residues on cyt c. High-field natural abundance 1H,15N HSQC NMR experiments are consistent with surface mimetics binding to cyt c in similar manner to CCP. This provides a framework for understanding recognition of proteins by supramolecular receptors and informing the design of ligands superior to the protein partners upon which they are inspired.
Reduction of CO2 using a rhenium bipyridine complex containing ancillary BODIPY moieties
Teesdale, Justin J.,Pistner, Allen J.,Yap, Glenn P.A.,Ma, Ying-Zhong,Lutterman, Daniel A.,Rosenthal, Joel
, p. 149 - 157 (2014)
The reduction of carbon dioxide to chemical fuels such as carbon monoxide is an important challenge in the field of renewable energy conversion. Given the thermodynamic stability of carbon dioxide, it is difficult to efficiently activate this substrate in a selective fashion and the development of new electrocatalysts for CO2 reduction is of prime importance. To this end, we have prepared and studied a new fac-ReI(CO)3 complex supported by a bipyridine ligand containing ancillary BODIPY moieties ([Re(BB2)(CO)3Cl]). Voltammetry experiments revealed that this system displays a rich redox chemistry under N2, as [Re(BB2)(CO) 3Cl] can be reduced by up to four electrons at modest potentials. These redox events have been characterized as the ReI/0 couple, and three ligand based reductions - two of which are localized on the BODIPY units. The ability of the BB2 ligand to serve as a non-innocent redox reservoir is manifest in an enhanced electrocatalysis with CO2 as compared to an unsubstituted Re-bipyridine complex lacking BODIPY units ([Re(bpy)(CO) 3Cl]). The second order rate constant for reduction of CO2 by [Re(BB2)(CO)3Cl] was measured to be k = 3400 M-1 s-1 at an applied potential of -2.0 V versus SCE, which is roughly three times greater than the corresponding unsubstituted Re-bipyridine homologue. Photophysical and photochemical studies were also carried out to determine if [Re(BB2)(CO)3Cl] was a competent platform for CO 2 reduction using visible light. These experiments showed that this complex supports unusual excited state dynamics that precludes efficient CO 2 reduction and are distinct from those that are typically observed for fac-ReI(CO)3 complexes.
Evaluation of Tris-Bipyridine Chromium Complexes for Flow Battery Applications: Impact of Bipyridine Ligand Structure on Solubility and Electrochemistry
Cabrera, Pablo J.,Yang, Xingyi,Suttil, James A.,Brooner, Rachel E. M.,Thompson, Levi T.,Sanford, Melanie S.
, p. 10214 - 10223 (2015)
This report describes the design, synthesis, solubility, and electrochemistry of a series of tris-bipyridine chromium complexes that exhibit up to six reversible redox couples as well as solubilities approaching 1 M in acetonitrile. We have systematically modified both the ligand structure and the oxidation state of these complexes to gain insights into the factors that impact solubility and electrochemistry. The results provide a set of structure-solubility-electrochemistry relationships to guide the future development of electrolytes for nonaqueous flow batteries. In addition, we have identified a promising candidate from the series of chromium complexes for further electrochemical and battery assessment.
Synthesis and characterisation of poly(bipyridine)ruthenium complexes as building blocks for heterosupramolecular arrays
Schwalbe, Matthias,Schaefer, Bernhard,Goerls, Helmar,Rau, Sven,Tschierlei, Stefanie,Schmitt, Michael,Popp, Juergen,Vaughan, Gavin,Henry, William,Vos, Johannes G.
, p. 3310 - 3319 (2008)
Poly(bipyridine)ruthenium complexes with carboxylate anchor groups are key components in dye-sensitised solar cells. In this contribution, an improved microwave-assisted synthetic procedure is presented for the important building block [RuCl2(dcmb)2] (dcmb = 4,4′-dimethoxycarbonyl- 2,2′-bipyridine), which results in short reaction times and high purity. The methyl esters are easily deprotected to give free carboxylate functions. In addition, a full structural, spectral and electrochemical characterisation of a series of complexes with the general formula [Ru(dcmb)3-n(tbbpy) n](PF6)2 with n = 0-3 and tbbpy = 4,4′-di-tert-butyl-2,2′-bipyridine is presented. The location of the lowest-energy metal-to-ligand charge transfer (MLCT) excited state is investigated by resonance Raman spectroscopy for selected complexes. The results obtained indicate that the nature of the excited state that is populated is dependent on the excitation wavelength. Wiley-VCH Verlag GmbH & Co. KGaA, 2008.
