A model potential in two forms (harmonic and anharmonic) is proposed to be used in molecular dynamics simulations of silicate frameworks. This model is applied to the calculation of structural and vibrational properties of the anhydrous phase of Linde 2Mite 4 A. Our system is formed by a cubic box corresponding to one crystallographic cell containing 662 atoms without constraints. The results are compared with experimental data. The proposed models satisfactorily reproduce the main features of the aluminosilicate framework structure and dynamics.

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The physico-chemical properties of the beta-diketonate diamine Cu(ii) compound with hfa (1,1,1,5,5,5-hexafluoro-2-4-pentanedionate) and TMEDA (N,N,N',N' tetramethylethylenediamine), Cu(hfa)(2).TMEDA, have been thoroughly investigated via an integrated multi-technique experimental-computational approach. In the newly found orthorhombic polymorph, as revealed by low temperature single-crystal X-ray studies, the complex is present as a monomer with a distorted octahedral geometry at the Cu(ii) centre. The compound sublimates, without premature side decompositions, at 343 K and 10(-3) Torr. The structural, vibrational, electronic and thermal behavior of the neutral Cu(hfa)(2).TMEDA complex has been investigated along with its fragmentation pathways, initiated by the release of an anionic hfa ligand with formation of a positive Cu(hfa).TMEDA(+) ion. Joint experimental and theoretical analyses led to the rationalization of the first fragmentation steps in terms of the Cu(ii)-ligands bonding properties and Jahn-Teller distortion. The present study suggests applications of Cu(hfa)(2).TMEDA as a precursor for copper and copper oxide materials by Chemical Vapor Deposition.