π-conjugated poly(monosubstituted) acetylenes containing Sn(II) and Sn(IV) species: investigation with laser ionization mass spectrometry

Abstract

Polyenes [HCCR] n (R=Ph, C 13H 9O), namely polyphenylacetylene (PPA) and polyethynylfluorenol (PEFl) containing Sn(II) and Sn(IV) in the polymer matrix, have been investigated using laser ionization mass spectrometry. The positive ion mass spectra show that carbon clusters linked to Sn, i.e. SnC n H + ( n=1–25) are formed for PPA, while a higher degree of fragmentation occurs for PEFl which gives SnC n H + ( n=1–8). The species SnCl 3 − is found in the negative ion patterns of the two polymers, regardless of whether the dopant was SnCl 2 or SnCl 4. This result suggests a lower stability of the tin complexes, formed by interaction with the polymer matrix, with respect to the iron chlorides or polyiodides species found in the LMS spectra of PPA/FeCl 3 and PPA/I 2, respectively, previously studied.