Thermally induced structural transformations of linear coordination polymers based on aluminum tris(diorganophosphates)

Maciej Dębowski , Krzysztof Łokaj , Andrzej Ostrowski , Janusz Zachara , Paulina Wiecińska , Paweł Falkowski , Anna Krztoń-Maziopa , Zbigniew Florjańczyk

Abstract

The thermal transitions of inorganic–organic hybrid polymers composed of linear aluminum tris(diorganophosphate) chains with a general formula of catena-Al[O2P(OR)2]3 (where R = C1–C8 alkyl group or phenyl moiety) have been studied by means of DSC, powder XRD, TGA and TG-QMS, as well as optical spectroscopy. DSC and XRD reveal that most of them undergo reversible structural transformations in the solid state between −100 and 200 °C caused by the changes in conformation of their organic substituents; however, a translational displacement of the rigid polymeric chains occurs only in the case of the derivative bearing long 2-ethylhexyl groups, which becomes liquid at about 140 °C. The thermal decomposition of the studied polymers begins between 200 and 265 °C depending on the type of organic substituent R decorating their aluminophospate core. TGA combined with mass spectrometry of the evolved gaseous products shows that the pyrolytic decomposition of Al[O2P(OR)2]3 proceeds either through β-elimination of olefin (for compounds with C2–C8 aliphatic ligands), or a homolytic cleavage of the P–OR bond (for methyl and phenyl derivatives); both processes are accompanied by condensation of the newly formed POH groups and liberation of water. Powder XRD, FTIR and SEM analyses of the solid residues indicate that thermolysis of Al[O2P(OR)2]3 accompanied by olefin elimination leads to the formation of condensed aluminum phosphates, mainly aluminum cyclohexaphosphate, exhibiting porous morphology. On the other hand, thermal degradation of methyl or phenyl derivatives results in amorphous aluminophosphate residues, and the latter contains conducting carbonaceous phases.
Author Maciej Dębowski (FC / CPCT)
Maciej Dębowski,,
- Chair Of Polymer Chemistry And Technology
, Krzysztof Łokaj (FC / CPCT)
Krzysztof Łokaj,,
- Chair Of Polymer Chemistry And Technology
, Andrzej Ostrowski (FC / CICSST)
Andrzej Ostrowski,,
- Chair Of Inorganic Chemistry And Solid State Technology
, Janusz Zachara (FC / CICSST)
Janusz Zachara,,
- Chair Of Inorganic Chemistry And Solid State Technology
, Paulina Wiecińska (FC / CChT)
Paulina Wiecińska,,
- Chair of Chemical Technology
, Paweł Falkowski (FC / CChT)
Paweł Falkowski,,
- Chair of Chemical Technology
, Anna Krztoń-Maziopa (FC / CICSST)
Anna Krztoń-Maziopa,,
- Chair Of Inorganic Chemistry And Solid State Technology
, Zbigniew Florjańczyk (FC / CPCT)
Zbigniew Florjańczyk,,
- Chair Of Polymer Chemistry And Technology
Journal seriesDalton Transactions: the international journal for inorganic, organometallic and bioinorganic chemistry , ISSN 1477-9226, (A 40 pkt)
Issue year2018
Vol47
Pages16480-16491
Publication size in sheets0.55
Keywords in Englishaluminum tris(diorganophosphate), aluminophosphate, thermolysis, pyrolysis, thermal degradation, aluminum metaphosphate
ASJC Classification1604 Inorganic Chemistry
DOIDOI:10.1039/C8DT02672F
Languageen angielski
File
Dębowski_Dalton Transactions 47 (2018) 16480-16491.pdf 1.74 MB
Score (nominal)40
ScoreMinisterial score = 40.0, 23-09-2019, ArticleFromJournal
Publication indicators WoS Citations = 0; Scopus Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2017 = 0.904; WoS Impact Factor: 2017 = 4.099 (2) - 2017=3.872 (5)
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