37570-85-7Relevant academic research and scientific papers
Long tethers binding redox centers to polymer backbones enhance electron transport in enzyme "wiring" hydrogels
Mao, Fei,Mano, Nicolas,Heller, Adam
, p. 4951 - 4957 (2003)
A redox hydrogel with an apparent electron diffusion coefficient (Dapp) of (5.8 ± 0.5) × 10-6 cm2 s-1 is described. The order of magnitude increase in Dapp relative to previously studied redox hydrogels results from the tethering of redox centers to the backbone of the cross-linked redox polymer backbone through 13 atom spacer arms. The long and flexible tethers allow the redox centers to sweep electrons from large-volume elements and to collect electrons of glucose oxidase efficiently. The spacer arms make the collection of electrons from glucose oxidase so efficient that glucose is electrooxidized already at -0.36 V versus Ag/AgCl, the reversible potential of the redox potential of the FAD/FADH2 centers of the enzyme at pH 7.2. The limiting current density of 1.15 mA cm-2 is reached at a potential as low as -0.1 V versus Ag/AgCl. The novel redox center of the polymer is a tris-dialkylated N,N′-biimidazole Os2+/3+ complex. Its redox potential, -0.195 V versus Ag/AgCl, is 0.8 V reducing relative to that of Os(bpy)2+/3+, its 2,2′-bipyridine analogue.
Dioxouranium(VI) and thorium(IV) complexes of 1-methyl-2,2'-bisimidazole
Mansingh, P. S.,Mohanty, R. R.,Jena, S.,Dash, K.
, p. 639 - 642 (2007/10/03)
The biheterocyclic nitrogen donor ligand 1-methyl-2,2'-bisimidazole (MBIM) reacts with UO2X2 and ThX4 to form mononuclear complexes of the types UO2(MBIM)X2 (X=Cl, I, NCS, NO3, CH3COO, 0.5 SO4) and Th(MBIM)2X4 (X=NO3, I).The complexes are characterised by elemental analyses, conductivity, thermogravimetry and IR, NMR as well as mass spectra.The IR spectra of uranyl complexes exhibit ν(U=0) in the regions 900-925 and 825-860 cm-1 in addition to the vibrational bands of the ligand and those of the polyatomic anions.The 1H NMR spectra of the ligand and the complexes are identical, with the -CH3 group resonating at 3.5 ppm and the NH proton at 3.9 ppm region.The ring protons are observed as multiplets in the region of 7.0 to 8.0 ppm.The mass spectra of the ligand gives molecular ion peak at m/z 148 and other fragmentation products, which are appropriately assigned.However, for the complexes neither the molecular ion peak nor the metallated fragmentation patterns are observed.Thermogravimetry shows the loss of ligands in stages, finally forming the stable metal oxides as the end product.
