Chemical lithium insertion into sol–gel lamellar manganese dioxide MnO_1.85·nH₂O

Sol Gel Intercalation Materials for Lithium Batteries

“…For a d.o.d of = 0.6 F/mole, and a C/20 discharge-charge rate, the specific capacity stabilizes near 120 Ah/kg. This study also emphasized the preponderant role of structural water for the rechargeability of the material [ 12].…”

“…The thermal analysis of the sol-gel birnessite reveals a large endothermic peak originating from the departure of weakly bonded water molecules near 120 0 C while an endothermic peak at 540' C corresponds to the transformation of the compound into bixbyite aMn203 [12]. : X-ray diffraction spectra of (a) the hexagonal ternary oxide Na0.7MnO2; (b) the solgel synthesized hexagonal sodium compound Nao.45MnO2.14, 0.76H20; and (c) the sol-gel synthesized hexagonal sodium-free compound MnO 1 .84, 0.7H20 A detailed structural and electrochemical investigation has been performed in order to elucidate the Li insertion process into sol gel birnessite [2,3,6,11,12].…”

“…: X-ray diffraction spectra of (a) the hexagonal ternary oxide Na0.7MnO2; (b) the solgel synthesized hexagonal sodium compound Nao.45MnO2.14, 0.76H20; and (c) the sol-gel synthesized hexagonal sodium-free compound MnO 1 .84, 0.7H20 A detailed structural and electrochemical investigation has been performed in order to elucidate the Li insertion process into sol gel birnessite [2,3,6,11,12]. Lithium easily enters trigonal prismatic sites in the potential range 4.2/2.85 V and then induces a monoclinic distortion from x = 0.05 to lead to a closely related monoclinic phase (a = 5.15 A; b = 2.86 A ; c = 14.29 A 03 = 102,10) which is pure for x > 0.25.…”

Synthesis of novel fused tricyclic quinolones: 4a,5‐Dihydro‐1H‐[1;2,4]triazino[1,6‐a]quinoline‐2,4,6(3H)‐triones

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A versatile methodology to build the 1H- [1,2,4]triazino [1,6-a]quinoline-2,4,6(3H)-trione structure from methyl 6-fluoro4-oxo-1,4-dihydro-2-quinolinecarboxylate was developed. The method involves an N-amination followed by condensation of an aroyl isocyanate to form an alpha semicarbazidocarboxylate that readily cyclizes to the fused [1,2,4]triazino ring under ammonia/ethanol condition.

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“…The method involves an N-amination followed by condensation of an aroyl isocyanate to form an alpha semicarbazidocarboxylate that readily cyclizes to the fused [1,2,4]triazino ring under ammonia/ethanol condition. Also, the reactivity of the [1,2,4]triazino ring thus obtained was studied.Among the different quinolones carboxylic families of antibacterial agents there is a series of potent tricyclic and tetracyclic compounds containing a three-or four-a t o m bridge connecting the N1-C8 vicinal positions of quinolones [1]. These series include oxolinic acid [2], tioxacin [3], flumequin [4], ofloxacin [5], and other different tricyclic quinolones, which contain a three-atom bridge connecting the C2 to either the N1 [6a-c] or the C3 [6d].So, we are interested in preparing novel fused tricyclic quinolones that are non carboxylic at the C3 position, and contain a four-atom bridge connecting the N1 with the C2…”