Fotólise no estado estacionário e com pulso de laser de 1-benzociclanonas e de seus derivados <FONT FACE=Symbol>a</font>,<FONT FACE=Symbol>a</font> -dimetilados Steady-state and laser flash photolysis of 1 - benzocyclanones and their <FONT FACE=Symbol>a</font>,<FONT FACE=Symbol>a</font> -dimethyl derivatives
<abstract language="eng">Laser excitation of 0.01 M solutions of 1-indanone (Ia), 1-tetralone (Ib), 1-benzosuberone (Ic), and their <FONT FACE="Symbol">a</font>,<FONT FACE="Symbol">a</font> -dimethyl derivatives IIa-c, respectively, in benz...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Química
1999-07-01
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| Series: | Química Nova |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421999000400010 |
| _version_ | 1824011381367635968 |
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| author | José Carlos Netto-Ferreira J. C. Scaiano |
| author_facet | José Carlos Netto-Ferreira J. C. Scaiano |
| author_sort | José Carlos Netto-Ferreira |
| collection | DOAJ |
| description | <abstract language="eng">Laser excitation of 0.01 M solutions of 1-indanone (Ia), 1-tetralone (Ib), 1-benzosuberone (Ic), and their <FONT FACE="Symbol">a</font>,<FONT FACE="Symbol">a</font> -dimethyl derivatives IIa-c, respectively, in benzene, produced transients with maximum absorption at 425 nm, and lifetimes ranging from 62 ns (IIa) to 5.5<FONT FACE="Symbol">m</font>s (Ic). Quenching studies using well known triplet quenchers such as 1,3-cyclohexadiene and oxygen demonstrated the triplet nature of these transients. In the presence of hydrogen donors, such as 2-propanol, the triplet state decay of the ketones Ia-c leads to the formation of the corresponding ketyl radicals, i.e. IIIa-c, which show absorption spectra very similar to the parent ketone, with <FONT FACE="Symbol">l</font>max at 430 nm and lifetime in excess of 20 <FONT FACE="Symbol">m</font>s. Steady state irradiations show that the <FONT FACE="Symbol">a</font>,<FONT FACE="Symbol">a</font> -dimethyl ketones IIa and IIc form ortho-alkyl benzaldehydes probably derived from an initial a-cleavage of the corresponding triplet excited states. |
| first_indexed | 2024-12-18T21:33:30Z |
| format | Article |
| id | doaj.art-3ef62b781513450593ec064cf1953628 |
| institution | Directory Open Access Journal |
| issn | 0100-4042 1678-7064 |
| language | English |
| last_indexed | 2024-12-18T21:33:30Z |
| publishDate | 1999-07-01 |
| publisher | Sociedade Brasileira de Química |
| record_format | Article |
| series | Química Nova |
| spelling | doaj.art-3ef62b781513450593ec064cf19536282022-12-21T20:51:00ZengSociedade Brasileira de QuímicaQuímica Nova0100-40421678-70641999-07-0122451652110.1590/S0100-40421999000400010Fotólise no estado estacionário e com pulso de laser de 1-benzociclanonas e de seus derivados <FONT FACE=Symbol>a</font>,<FONT FACE=Symbol>a</font> -dimetilados Steady-state and laser flash photolysis of 1 - benzocyclanones and their <FONT FACE=Symbol>a</font>,<FONT FACE=Symbol>a</font> -dimethyl derivativesJosé Carlos Netto-FerreiraJ. C. Scaiano<abstract language="eng">Laser excitation of 0.01 M solutions of 1-indanone (Ia), 1-tetralone (Ib), 1-benzosuberone (Ic), and their <FONT FACE="Symbol">a</font>,<FONT FACE="Symbol">a</font> -dimethyl derivatives IIa-c, respectively, in benzene, produced transients with maximum absorption at 425 nm, and lifetimes ranging from 62 ns (IIa) to 5.5<FONT FACE="Symbol">m</font>s (Ic). Quenching studies using well known triplet quenchers such as 1,3-cyclohexadiene and oxygen demonstrated the triplet nature of these transients. In the presence of hydrogen donors, such as 2-propanol, the triplet state decay of the ketones Ia-c leads to the formation of the corresponding ketyl radicals, i.e. IIIa-c, which show absorption spectra very similar to the parent ketone, with <FONT FACE="Symbol">l</font>max at 430 nm and lifetime in excess of 20 <FONT FACE="Symbol">m</font>s. Steady state irradiations show that the <FONT FACE="Symbol">a</font>,<FONT FACE="Symbol">a</font> -dimethyl ketones IIa and IIc form ortho-alkyl benzaldehydes probably derived from an initial a-cleavage of the corresponding triplet excited states.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421999000400010laser flash photolysis1-benzocyclanonesphosphorescencehydrogen abstraction |
| spellingShingle | José Carlos Netto-Ferreira J. C. Scaiano Fotólise no estado estacionário e com pulso de laser de 1-benzociclanonas e de seus derivados <FONT FACE=Symbol>a</font>,<FONT FACE=Symbol>a</font> -dimetilados Steady-state and laser flash photolysis of 1 - benzocyclanones and their <FONT FACE=Symbol>a</font>,<FONT FACE=Symbol>a</font> -dimethyl derivatives Química Nova laser flash photolysis 1-benzocyclanones phosphorescence hydrogen abstraction |
| title | Fotólise no estado estacionário e com pulso de laser de 1-benzociclanonas e de seus derivados <FONT FACE=Symbol>a</font>,<FONT FACE=Symbol>a</font> -dimetilados Steady-state and laser flash photolysis of 1 - benzocyclanones and their <FONT FACE=Symbol>a</font>,<FONT FACE=Symbol>a</font> -dimethyl derivatives |
| title_full | Fotólise no estado estacionário e com pulso de laser de 1-benzociclanonas e de seus derivados <FONT FACE=Symbol>a</font>,<FONT FACE=Symbol>a</font> -dimetilados Steady-state and laser flash photolysis of 1 - benzocyclanones and their <FONT FACE=Symbol>a</font>,<FONT FACE=Symbol>a</font> -dimethyl derivatives |
| title_fullStr | Fotólise no estado estacionário e com pulso de laser de 1-benzociclanonas e de seus derivados <FONT FACE=Symbol>a</font>,<FONT FACE=Symbol>a</font> -dimetilados Steady-state and laser flash photolysis of 1 - benzocyclanones and their <FONT FACE=Symbol>a</font>,<FONT FACE=Symbol>a</font> -dimethyl derivatives |
| title_full_unstemmed | Fotólise no estado estacionário e com pulso de laser de 1-benzociclanonas e de seus derivados <FONT FACE=Symbol>a</font>,<FONT FACE=Symbol>a</font> -dimetilados Steady-state and laser flash photolysis of 1 - benzocyclanones and their <FONT FACE=Symbol>a</font>,<FONT FACE=Symbol>a</font> -dimethyl derivatives |
| title_short | Fotólise no estado estacionário e com pulso de laser de 1-benzociclanonas e de seus derivados <FONT FACE=Symbol>a</font>,<FONT FACE=Symbol>a</font> -dimetilados Steady-state and laser flash photolysis of 1 - benzocyclanones and their <FONT FACE=Symbol>a</font>,<FONT FACE=Symbol>a</font> -dimethyl derivatives |
| title_sort | fotolise no estado estacionario e com pulso de laser de 1 benzociclanonas e de seus derivados font face symbol a font font face symbol a font dimetilados steady state and laser flash photolysis of 1 benzocyclanones and their font face symbol a font font face symbol a font dimethyl derivatives |
| topic | laser flash photolysis 1-benzocyclanones phosphorescence hydrogen abstraction |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421999000400010 |
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