Hydrothermal synthesis, crystal structures, spectroscopic, and magnetic properties of two new organically templated monodimensional phosphite compounds:: (C2H10N2)[M(HPO3)F3], M = V(III) and Cr(III)

The organically templated (C2H10N2) [M(HPO3)F-3], M = V(III) and Cr(III), compounds have been synthesized under mild hydrothermal conditions. The crystal structures have been determined from X-ray single-crystal diffraction data. The compounds crystallize in the, P2(1)2(1)2(1) orthorhombic space group. The unit-cell parameters are a = 12.809(2) Angstrom, b = 9.518(1) Angstrom, c = 6.440(1) Angstrom for the vanadium phase, and a = 12.801(2) Angstrom, b 9.337(1) Angstrom, c = 6.508(1) A for the chromium compound, with Z = 4. The crystal structure of these compounds consists of [M(HPO3)F-3](2-) anionic chains. The ethylenediammonium cations are placed in the space delimited by three different chains. The metallic ions are interconnected by the pseudopyramidal (HPO3)(2-) phosphite oxoanions and the fluorine anions, adopting a slightly distorted octahedral geometry. The IR and Raman spectra show the bands corresponding to the phosphite oxoanion and ethylenediammonium cation. The Dq and Racah (B and C) parameters have been calculated from the diffuse reflectance spectra in the visible region. The ESR spectra of the chromium(III) compound are isotropic with a g value of 1.97. Magnetic measurements indicate the existence of antiferromagnetic interactions.