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Master of Science Degree King Fahd University of Petroleum and Minerals Dhahran, Saudi Arabia
| Content Provider | Semantic Scholar |
|---|---|
| Author | Paver, Nello Simeoni, F. |
| Copyright Year | 1993 |
| Abstract | The proton-transfer reaction of 1,8-Diaminonaphthalene (1,8-DAN) in acidic medium and in zeolite sieves was studied by means of laser-induced picosecond spectroscopy. It has been found that there are three clear different forms of 1,8-DAN in the ground state, but only two different forms in the excited state. The absorption of the mono-cation form of 1,8-DAN is found to be a mixture of the neutral form and the di-cation form. However, the emission is found to be only from the neutral form, due to the fast dissociation of the mono-cation form once it is excited. The mono-cation form of 1,8-DAN behaves as dual fluorescence under different excitation wavelengths. The di-cation form only fluoresces if no free water cluster is available as a proton acceptor. The reaction in the excited state was shown to be a diabatic quenching reaction. With the help of quantum yields and fluorescence lifetime measurements these results are interpreted in terms of a new photochemical scheme. All dissociation and quenching rate constants, pKa and kq, have been determined. 1,8-DAN was investigated inside zeolite Y sieves and has been shown that it may be used as a probe molecule to assess zeolite acidity. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://faculty.kfupm.edu.sa/CHEM/abetar/Abstract.PDF |
| Alternate Webpage(s) | http://arxiv.org/pdf/hep-ph/9308328v1.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
