Syntheses and crystal structures of the first organically templated metal tellurites

The first organically templated vanadium tellurites. [H(2)en][(VO2)(TeO3)](2)center dot H2O (1, en = ethylenediamine) and [H(2)pip][(VO2) (TeO3)](2) (2, pip = piperazine) have been synthesized by hydrothermal reactions and structurally characterized, Both compounds feature a [(VO2)(TeO3)](-) anionic layer containing V2Te2 four-member rings and V4Te4 eight member rings, The vanadium (V) atom is five coordinated by three tellurite oxygens and two terminal oxygen atoms in a distorted trigonal bipyramidal geometry. The interconnection of the VO5 polyhedra by bridging tellurite groups leads to a 2D corrugated anionic inorganic layer, The doubly protonated template cations and the lattice water molecules in I are located at the interlayer space and are involved in hydrogen bonding. The doubly protonated template cation in 2 is not involved in hydrogen bonding with the anionic inorganic layer. (c) 2005 Elsevier Inc. All rights reserved.