67994-94-9Relevant academic research and scientific papers
Triptycene-derived macrotricyclic polyether containing an anthracene unit as a powerful host for 1,2-bis(pyridium)ethane, diquat and 2,7-diazapyrenium salt
Gu, Ya-Kun,Zeng, Fei,Meng, Zheng,Chen, Chuan-Feng
, p. 2850 - 2853 (2014)
Triptycene-derived macrotricyclic polyether containing an anthracene unit is a powerful host for 1,2-bis(pyridium)ethane, diquat and 2,7-diazapyrenium salt with association constants of the 1:1 complexes at >105 M-1. Crystal structures showed that π-π stacking interactions between the host and the guests play an important role in the formation of the stable complexes. This journal is the Partner Organisations 2014.
Temperature-Dependent Emission and Turn-Off Fluorescence Sensing of Hazardous "quat" Herbicides in Water by a Zn-MOF Based on a Semi-Rigid Dibenzochrysene Tetraacetic Acid Linker
Jindal, Swati,Moorthy, Jarugu Narasimha,Mukhopadhyay, Arindam,Savitha, Govardhan
supporting information, p. 6202 - 6213 (2020/05/01)
A zinc metal-organic framework, i.e., Zn-MOF (Zn-DBC), with ca. 27% solvent-accessible void volume was synthesized from a rationally designed tetraacid based on sterically insulated dibenzo[g,p]chrysene core; the latter inherently features concave shapes.
Shape-Selective Assemblies of Charge-Transfer Complexes as Molecular Probes for Water Adsorption in Zeolites
Yoon, K. B.,Huh, T. J.,Kochi, J. K.
, p. 7042 - 7053 (2007/10/02)
The supercage of zeolite-Y and the restricted channels of zeolite-L, mordenite, and mazzite act as shape-selective hosts to a series of brightly colored charge-transfer complexes +, D> assembled in situ by the intercalation of various aromatic donors (D) into the ion-exchanged (colorless) zeolites with different pyridinium acceptors (A+).Upon the deliberate introduction of water (vapor) into the variously colored zeolites, the diffuse reflectance spectra suffer pronounced spectral shifts of the charge-transfer bands, the magnitude of ΔhνCT being uniquely dependent on the molecular size/shape of A+ and D, as well as the dimensions of the zeolite cavities.In accordance with the bond compression model of intermolecular charge-transfer complexes, the bathochromic shifts to lower energies (+ΔhνCT) are ascribed to hyperbaric effects induced by the absorption of water within the constricted channels of zeolite-L, mordenite, and mazzite (but not in the larger supercage of zeolite-Y).The importance of water coordination is also underscored by the unusual hypsochromic effects (-ΔhνCT) that are observed when cyano-substituted pyridinium acceptors o-CP+ and p-CP+ are doped into zeolite-Y (but not into zeolite-L, mordenite, or mazzite).These results thus show that the intermolecular charge-transfer complexes +, D> are shape-selective and can be used as quantitative visual probes for water absorption into zeolite cavities, and they provide the experimental basis for further theoretical analysis.
Effect of Charge Transport in Electrode-Confined N,N'-Dialkyl-4,4'-bipyridinium Polymers on the Current-Potential Response for Mediated, Outer-Sphere Electron-Transfer Reactions
Lewis, Nathan S.,Wrighton, Mark S.
, p. 2009 - 2017 (2007/10/02)
Mediated outer-sphere redox processes have been examined at rotating disk Pt/2+/+)n>surf electrodes.The 2+/+)n>surf is a redox polymer anchored to the surface and is formed from N,N'-bis-4,4'-bipyridinium, I.The polymer coverages for the electrodes selected for study are sufficiently great that Fe(phen)33+/2+, E0' = +1.03 V vs.SCE, shows no electrochemial response near its E0'.The mediated reduction of Fe(phen)33+ and a number of other outer-sphere oxidants is mass-transport limited when the Pt/2+/+)n>surf electrode is held ca. 100 mV more negative than E0'2+/+)n>surf = -0.45 v vs.SCE in CH3CN/0.1 M ClO4.However, contrary to theoretical expectations based only on the rate constant for reaction of Fe(phen)33+ with a surface PQ+, the onset of current for the mediated reduction is at the onset for 2+)n>surf -> +)n>surf reduction; in fact, the mediated reduction current in the onset region is directly proportional to the concentration of PQ+ in the surface-confined polymer.Data for Pt/2+*χFe(CN)63-/4-)n>surf electrodes show directly that charge transport in the polymer can be a limitation to the maximum steady-state mediation current in aqueous electrolyte solution at the coverages of 2+/+)n>surf that have been employed.The charge-transport properties of the polymer are concluded to control the current-potential profile, as has been reported previously for other surface-modified electrodes, for the large polymer coverages employed in these studies.
