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L Armelao

Publications and source records attributed to L Armelao.

4 recordsLinked to original sources
PubMed2001

Electrospray ionization mass spectrometric study of the hydrolysis-polycondensation process of Sn(OBu(t))(4).

The oligomerization of Sn(OBu(t))(4) in the sol-gel process has been studied by several different analytical approaches. Electrospray ionization (ESI) mass spectrometry was highly effective in describing the first species produced by the hydrolysis-polycondensation reactions. Mössbauer spectroscopy has elucidated the fast behavior of the hydrolytic oligomerization process, while calorimetric data have demonstrated the high enthalpy of the reaction in the presence of different solvents.

Air Pollutants↗
PubMed2000

1-(2-Hydroxy-4,6-dimethylphenyl)ethanone.

In the crystal of the title compound, C(10)H(12)O(2), there are two symmetry-independent molecules, which are essentially superimposable. Each molecule exhibits an intramolecular O-H.O hydrogen bond, with O.O separations of 2.483 (4) and 2.468 (4) A.

Journal Article↗
PubMed2000

Electrospray ionization in the study of the polycondensation of Ti(O-i-C3H7)4 and Ti(O-n-C4H9)4

The polycondensation of Ti(O-i-C3H7)4 (1) and Ti(O-n-C4H9)4 (2), precursors widely employed in sol-gel processes, has been investigated by electrospray ionization mass spectrometry. By analysis of 10(-6) M methanol solutions of compounds 1 and 2, the same ionic species are detected, proving that the first step in the polycondensation reaction is the i-propyl (or n-butyl) alcohol-methanol complete exchange. This reaction leads to the Ti(OCH3)4 (3) species, representing the synthon of the polycondensation. Various oligomers of 3 have been detected and characterized by MS/MS experiments, and the related mechanisms have been discussed. A minor oligomeric series due to hydroxyl-containing polycondensation products has also been characterized.

Journal Article↗