The first examples of benzidinium cations templated low-dimensional molybdates

摘要

For the first time, use of benzidine as a structure-directing agent has resulted in the crystallization of two novel organic/inorganic hybrid molybdates under hydrothermal condition (180 degrees C and autogenous pressure). The presence of monoprotonated benzidinium ions in aqueous molybdate solution appears to engineer two new hybrid solids: one-dimensional chains in [H2NC12H8NH3](2)Mo2O7, 1 (a = 5.9686, b = 7.0761 and c = 14.3293 angstrom, alpha = 77.17 degrees, beta = 85.25 degrees and gamma = 88.56 degrees; P (1) over cap and Z = 2) and two-dimensional step-wise layered molybdate [H2NC12H8NH3](2)Mo5O16, 2 (a = 5.6843, b = 14.3024 and c = 19.4787 angstrom, alpha = 108.1 degrees, beta = 98.4 degrees and gamma = 90.0 degrees; P (1) over cap, Z = 2). 1 is an unusual solid wherein the anionic chains are charge compensated by counter cations which also act as ligands to the metal and 2 is a new layered molybdate built of MoO5 square pyramids and MoO6 octahedra. (c) 2004 Elsevier B.V. All rights reserved.