Synthesis of Molecular Precursors of Phosphates and Oxides of Metals and their Processing into
                                             Materials

                                           Ján Podhorský

The usage of phosphate materials as a catalysts and sorbents is well known and well documented. We
have focused on preparation of porous phosphate materials of aluminium, using non-hydrolytic
sol-gel methods. Reactions of chosen trialkylesters of phosphoric acid (RO)[3]PO (R = Me, Et, ^iPr,
^nBu) with EtAlCl[2] were used. Reaction pathway, reagent ratio, reaction and processing conditions
were carefully investigated. Using our reaction route and optimizing the processing, we have
obtained obtained amorphous aluminophosphate xerogels with surface area (BET) up to
400–500 m^2 g^–1 provided by small mesopores (2–8 nm).


Thin metaloxide layers have found their applications in various dielectrical and optical coatings.
Our work focused on precursors for MOCVD, containing volatility-increasing –CF[3] group. We used
N,O–β heteroarylalketonates as ligands (3,3,3-trifluoro(pyridin-2-yl)propen-2-ol (PyTFPH)),
3,3,3-trifluoro(dimethyl-1,3-oxazol-2-yl)propen-2-ol (DMOTFP) and
3,3,3-trifluoro(1,3-benzthiazol-2-yl)propen-2-ol (BTTFP)), as well as certain aliphatic alcohols
containing –CF[3] group (2,2,2-trifluoroethanol (TFEH) and 1,1,1,3,3,3-hexafluoro-2-propanol
(HFPH)). The source of metal was either R[2]AlCl for aluminium, or Sn(O^tBu)[4] for tin,
respectively. The number of novel obtained structures was obtained. The properties of our
metallorganic complexes were determined, particularly using TG/DSC analysis, their volatility was
investigated.

        Figure 1: Reaction pathway of Et[2]AlCl with PyTFPH in THF as coordinating solvent