37394-62-0Relevant academic research and scientific papers
CFA-2 and CFA-3 (Coordination Framework Augsburg University-2 and -3); Novel MOFs assembled from trinuclear Cu(i)/Ag(i) secondary building units and 3,3′,5,5′-tetraphenyl-bipyrazolate ligands
Grzywa, Maciej,Gessner, Christof,Denysenko, Dmytro,Bredenkoetter, Bjoern,Gschwind, Fabienne,Fromm, Katharina M.,Nitek, Wojciech,Klemm, Elias,Volkmer, Dirk
, p. 6909 - 6921 (2013/08/25)
The syntheses of H2-phbpz, [Cu2(phbpz)] ·2DEF·MeOH (CFA-2) and [Ag2(phbpz)] (CFA-3) (H 2-phbpz = 3,3′,5,5′-tetraphenyl-1H,1′H-4,4′- bipyrazole) compounds and their crystal structures are described. The Cu(i) containing metal-organic framework CFA-2 crystallizes in the tetragonal crystal system, within space group I41/a (no. 88) and the following unit cell parameters: a = 30.835(14), c = 29.306(7) A, V = 27 865(19) A3. CFA-2 features a flexible 3-D three-connected two-fold interpenetrated porous structure constructed of triangular Cu(i) subunits. Upon exposure to different kinds of liquids (MeOH, EtOH, DMF, DEF) CFA-2 shows pronounced breathing effects. CFA-3 crystallizes in the monoclinic crystal system, within space group P21/c (no. 14) and the following unit cell parameters: a = 16.3399(3), b = 32.7506(4), c = 16.2624(3) A, β = 107.382(2)°, V = 8305.3(2) A3. In contrast to the former compound, CFA-3 features a layered 2-D three-connected structure constructed from triangular Ag(i) subunits. Both compounds are characterized by elemental and thermogravimetric analyses, single crystal structure analysis and X-ray powder diffraction, FTIR- and fluorescence spectroscopy. Preliminary results on oxygen activation in CFA-2 are presented and potential improvements in terms of framework robustness and catalytic efficiency are discussed. The Royal Society of Chemistry 2013.
Nitrosation of Methyl and Phenyl Styryl Ketoximes Under Oxygen. Formation of 4-Nitro-1-hydroxypyrazole 2-Oxides and 3,5-Diphenyl-4-nitrato-4,5-dihydroisoxazole
Hansen, John F.,Georgiou, Paul J.
, p. 1487 - 1492 (2007/10/02)
The nitrosation of the oximes of 4-phenyl-3-buten-2-one and 1,3-diphenyl-2-propen-1-one under oxygen has been reinvestigated.In addition to 4-oxo- and 4-oximino-4H-pyrazole 1,2-dioxides previously reported, the reactions give 4-nitro-1-hydroxypyrazole 2-oxides.In the case of 1,3-diphenyl-2-propen-1-one oxime the nitrosation reaction also gives 3,5-diphenyl-4-nitrato-4,5-dihydroisoxazole.Evidence is presented suggesting that the nitrate ester is formed through the rearrangement of a peroxynitrite intermediate.
