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Thermal stability of boron subphthalocyanines as a function of the axial and peripheral substitution |
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| Authors: | David Gonzá lez-Rodrí guez,Elton L.G. Denardin,Dimitrios Samios |
| Affiliation: | a Universidad Autónoma de Madrid, Departamento de Química Orgánica C-I, Facultad de Ciencias, Cantoblanco, 28049 Madrid, Spain b Universidade Federal do Rio Grande do Sul, Instituto de Química, Laboratório de Instrumentação e Dinâmica Molécular, Av. Bento Gonçalves, 9500, CP 15003, CEP 91501-970, Porto Alegre, RS, Brazil c Universidade Federal do Pampa, Laboratório de Estudos Físico-Químicos e Produtos Naturais, Campus Uruguaiana, BR 472, Km 7, CP 118, CEP: 97.500-970, Uruguaiana, RS, Brazil d Universidade Federal do Rio Grande do Sul, Instituto de Química, Laboratório de Novos Materiais Orgânicos, Av. Bento Gonçalves, 9500, CP 15003, CEP 91501-970, Porto Alegre, RS, Brazil e Universidade Luterana do Brasil, Laboratório Industrial de Polímeros, Rua Miguel Tostes, 101, CEP 92420-280 Canoas, RS, Brazil |
| Abstract: | In this work, we have carried out the synthesis and thermogravimetric study of 10 different axially and peripherally substituted boron subphthalocyanines, in order to compare their thermal stabilities under non-oxidizing conditions. We demonstrate that, in general, these compounds enjoy a relatively high thermal stability, a property that is fundamental for future potential applications. The loss of the axial group is usually the first thermal degradation process to occur, and the temperature at which it takes place increases as a function of the nature of this substituent in the order: Br < OH ? OPh ∼ Cl. Peripheral substituents also have an influence on the thermal properties of subphthalocyanines, though their role is somewhat less notable. |
| Keywords: | Subphthalocyanines Phthalocyanines Thermal stability Thermogravimetry Boron complexes Cyclotrimerization reaction |
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