Extendable nickel complex tapes that reach NIR absorptions
Stepwise synthesis of linear nickel complex oligomer tapes with no need for solid-phase support has been achieved. The control of the length in flat arrays allows a fine-tuning of the absorption properties from the UV to the NIR region.
We report a novel crystalline supramolecular polybenzobisimidazole (SP-PBBI) capable of providing a two-dimensional polymer (2DSP-PBBI) by liquid-phase exfoliation. A regular arrangement of rigid rod-like polybenzobisimidazole (PBBI) chains is achieved by interchain hydrogen bonding. Titration of 2DSP-PBBI with cobalt chloride (CoCl2) using UV-Vis spectroscopy demonstrates the presence of bidentate NO ligands on the PBBI backbone and NO–Co(II) complexation. Imaging analysis using atomic force microscopy (AFM) reveals the planar surface morphology of exfoliated 2DSP-PBBI sheets with lateral dimensions of 1 μm and thickness of 30 nm. The size of the polymer crystal growth is tuned by employing condensation/precipitation polymerization under nonisothermal conditions.
Seo, Wanji,Carpenter, Keith L.,Gaugler, James A.,Shao, Wenting,Werling, Keith A.,Fournier, Philip M.,Lambrecht, Daniel S.,Star, Alexander
UV-induced single and double hydrogen-atom migrations in 3,6-diimino-1,4-cyclohexadiene-1,4-diamine in a low-temperature argon matrix
Isomerization induced by ultraviolet radiation due to intramolecular hydrogen-atom migration in 3,6-diimino-1,4-cyclohexadiene-1,4-diamine (DCD) was studied by matrix-isolation Fourier transform infrared (IR) spectroscopy and density functional theory (DFT) calculation. Two isomers produced by single and double inversion of the hydrogen atom(s) around the CN bond(s) were identified using the wavelength dependence of the IR band-intensity changes. In addition, the IR bands of an intermediate produced by single hydrogen-atom transfer from the amino to the imino group (C-NH2?NHC) in the hydrogen bond were measured and identified by a comparison with the calculated spectral patterns. These observations confirm stepwise photoisomerization of DCD.
METHOD FOR PREPARING METAL-ORGANIC FRAMEWORK INCLUDING TWO ORGANIC LIGANDS
Disclosed are a method for preparing a method for preparing a metal-organic framework comprising two organic ligands, and a metal-organic framework prepared by the preparation method. Since the metal-organic framework has high porosity and excellent electrical conductivity, when the metal-organic framework is used for electrodes such as supercapacitors or secondary batteries and the like, energy density and output characteristics of a device can be improved.
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(2021/06/22)
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