Nobuhiro Kumada

Synthesis, crystal structure, and magnetic properties of Bi3Mn4O12(NO3) oxynitrate comprising S = 3/2 honeycomb lattice.

Neutron diffraction and FT-IR analysis revealed that the novel oxynitrate Bi(3)Mn(4)O(12)(NO(3)) (space group P3, a = 4.9692(1) A, c = 13.1627(3) A) prepared by hydrothermal synthesis is of a new structural type including flat NO(3) layers alternating with blocks of two PbSb(2)O(6)-like layers. Mn(4+) (S = (3)/(2)) forms a regular honeycomb lattice, and magnetic susceptibility data indicated two-dimensional magnetism. Despite its Weiss constant of -257 K, no long-range ordering was observed down to 0.4 K because of the magnetic frustration due to the competition between the nearest and the next-nearest antiferromagnetic interactions.

Intercalation of n-Alkylamines into Copper Molybdenum Bronze

Publisher Summary This chapter talks about an experiment where the copper molybdenum bronze, Cu0.21 MoO3, with a layered structure is reacted with n-alkylamines in the acetonitrile or aqueous solution and neat liquid of n-alkylamines in the temperature range of room temperature to 70°C for up to three weeks. Alkylamines with the number of carbon atoms from 3 to 16 were found to form intercalation compounds with bronze. The basal spacing of the intercalation compounds increases linearly with the length of alkylamine. As copper ions in the bronze remained intact in the interlayer space during the reaction and protons were not included in the bronze, the intercalation reaction is considered to be neither an ion exchange reaction nor an acid-base reaction.