492-98-8Relevant articles and documents
A comprehensive study on the dye adsorption behavior of polyoxometalate-complex nano-hybrids containing classic β-octamolybdate and biimidazole units
Liang, Shuang,Nie, Yan-Mei,Li, Sang-Hao,Zhou, Jian-Liang,Yan, Jun
, (2019)
Six new hybrids based on β-[Mo8O26]4? polyoxometalates, [Ni(H2biim)3]2[β-Mo8O26]?8DMF(1); (DMA)2[M(H2biim)2(H2O)2][β-Mo8O26]?4DMF (M = Ni (2), Co (3)), DMA = dimethyl-ammonium, H2biim=2,20-biimidazole); [M(H2biim)(DMF)3]2[β-Mo8O26]?2DMF (M = Zn (4), Cu (5)); [(DMA)2 [Cu(DMF)4][β-Mo8O26]?2DMF]n (6), have been successfully synthesized and characterized. Compounds 2–5 show favorable capacity to adsorb methylene blue (MB) at room temperature, and they can selectively capture MB molecules from binary-mixture solutions of MB/MO (MO = Methyl Orange), or MB/RhB (RhB = Rhodamine B). Compound 3 can uptake up to 521.7 mg g?1 MB cationic dyes rapidly, which perform the maximum adsorption in an hour among the reported materials as far as we know. The compounds are stable and still work very efficiently after three cycles. For compound 3, the preliminary adsorption mechanism studies indicated that the adsorption is an ion exchange process and the adsorption behavior of polyoxometalate-complex can be benefited from additional exchangeable protons in the complex cations.
Bridged Derivatives of 2,2'-Biimidazole
Thummel, Randolph P.,Goulle, Veronique,Chen, Baili
, p. 3057 - 3061 (1989)
The reaction of 2,2'-biimidazole with 1,n-dihaloalkanes or o-xylylene dibromide leads to a series of N,N'-bridged derivatives.When these substances are treated with a second equivalent of 1,n-dihaloalkane, a series of bis-annelated biimidazolium salts is obtained.The conformations of these species are discussed with regard to their electronic absorption spectra and their 300-MHz 1H NMR spectra.The barriers for conformational inversion are found to be lower than for the corresponding bis-annelated 2,2'-bipyridinium salts.The redox properties of these salts are measured in CH3CN and DMSO, and their reductions are found to become increasingly more difficult and less reversible as the system becomes less planar.These results are explained primarily based on the greater N,N'-distance in 2,2'-biimidazole as compared with 2,2'-bipyridine.
Tetracarboxyl-functionalized ionic liquid: Synthesis and catalytic properties
Feng, Miaona,Zhao, Guoying,Gao, Hongling,Zhang, Suojiang
, p. 1513 - 1517 (2015)
Novel tetracarboxyl-functionalized 2,2′-biimidazolium-based ionic liquids (ILs) with different anions were synthesized in two steps from readily available and sustainable starting materials including ammonium acetate, glyoxal, and halogenated propionic acid. The functionalized IL exhibited higher catalytic activity towards the cycloaddition of CO2 to terminal epoxides. With propylene oxide as a substrate, the optimum yield of propylene carbonate reached 82.7% at an initial CO2 pressure of 2.0MPa for 4h at 140°C. Moreover, the functionalized IL catalyst displayed a high stability and can be reused for at least five cycles without obvious loss of catalytic activity. The results provide a simple and economical way to synthesize multi-functionalized imidazolium-based ILs with versatile potential applications.
Fully C/N-Polynitro-Functionalized 2,2'-Biimidazole Derivatives as Nitrogen- and Oxygen-Rich Energetic Salts
Yin, Ping,He, Chunlin,Shreeve, Jean'ne M.
, p. 2108 - 2113 (2016)
Through the use of a fully C/N-functionalized imidazole-based anion, it was possible to prepare nitrogen- and oxygen-rich energetic salts. When N,N-dinitramino imidazole was paired with nitrogen-rich bases, versatile ionic derivatives were prepared and fully characterized by IR, and 1H, and 13C NMR spectroscopy and elemental analysis. Both experimental and theoretical evaluations show promising properties for these energetic compounds, such as high density, positive heats of formation, good oxygen balance, and acceptable stabilities. The energetic salts exhibit promising energetic performance comparable to the benchmark explosive RDX (1,3,5-trinitrotriazacyclohexane). The combination of a fully C/N-functionalized biimidazole-based anion with nitrogen-rich cations gives rise to a series of nitrogen- and oxygen-rich energetic salts. Some of them show excellent detonation properties with acceptable thermal stabilities and sensitivities, which are comparable to the benchmark explosive RDX (1,3,5-trinitrotriazacyclohexane).
An ionic liquid-coordinated palladium complex: A highly efficient and recyclable catalyst for the Heck reaction
Xiao, Ji-Chang,Twamley, Brendan,Shreeve, Jean'ne M.
, p. 3845 - 3847 (2004)
The monoquaternary product of 2,2′-biimidazole with iodobutane is an ionic liquid that acts as both the solvent and ligand for catalytic reactions. A new palladium complex was prepared by adding PdCl2 to this ionic liquid to form a catalytic solution that is effective for Heck reactions with good recyclability.
Formation of 1,1'-bis(phenylmethyl)-2,2'-biimidazole-5,5'-dimethanol
Steffens,Schunack
, p. 183 - 185 (1986)
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Syntheses of 2,2'-Diimidazole
Nurgatin, V. V.,Ginzburg, B. M.,Sharnin, G. P.,Polyanskii, V. F.
, p. 854 - 856 (1987)
New methods of preparation of 2,2'-diimidazole have been developed, by the reaction of ammonia with 1,1-dibromoacetaldehyde (20percent yield) or with glyoxal sulfate (40percent), and by the cyclization of 1,2-dihydroxyethylenediamine dihydrochloride in the presence of sodium acetate (yield 60percent).
A series of blue-green-yellow-red emitting Cu(I) complexes: Molecular structure and photophysical performance
Zhang, Liming,Zuo, Qinghui
, (2019/06/25)
In this work, we designed a series of [Cu(N–N)(PPh3)2]BF4 complexes with different optical edge values and emission colors from blue to red, where N–N and PPh3 denoted a diamine ligand and triphenylphosphine, respectively. Six N–N ligands with various conjugation chains (short π chain, modest π chain and long π chain) were selected. A systematical comparison between these Cu(I) complexes was performed, so that the correlation between N–N structure and [Cu(N–N)(PPh3)2] photophysical performance was tentatively discussed. Their single crystal structure was found consistent with literature ones, forming a typical tetrahedral coordination geometry. Density functional theory calculation indicated that their onset electronic transition showed a mixed character of metal-to-ligand-charge-transfer and ligand-to-ligand-charge-transfer. Detailed analysis on photophysical parameters suggested that the absorption edge of [Cu(N–N)(PPh3)2]BF4 complex was controlled by conjugation length in diamine ligand. A wide absorption edge needed a short conjugation chain in diamine ligand. Similar tendency was found for their emission spectra. In addition, a long conjugation chain in diamine ligand widened emission spectra obviously. Emission dynamics showed slim correlation with diamine ligand conjugation length since the excited state was controlled mainly by dynamic procedure and steric factor of diamine ligands.
