Studies on the synthesis and fluorescent properties of long-chained 2-(5-alkyl-1,3,4-oxadiazol-2-yl)-3H-benzo[f]chromen-3-ones
Rajesha; Naik, HSB; Kumar, HNH; Hosamani, KM; Mahadevan, KM
| HERO ID | 4935954 |
|---|---|
| In Press | No |
| Year | 2009 |
| Title | Studies on the synthesis and fluorescent properties of long-chained 2-(5-alkyl-1,3,4-oxadiazol-2-yl)-3H-benzo[f]chromen-3-ones |
| Authors | Rajesha; Naik, HSB; Kumar, HNH; Hosamani, KM; Mahadevan, KM |
| Page Numbers | 11-19 |
| Abstract | The synthesis and fluorescent properties of some new benzocoumaryl heterocyclic molecules are presented. Condensation of 2-hydroxy-1-naphthaldehyde with diethyl malonate in the presence of catalytic amount of piperidine in ethanol affords benzocoumarin-3-ethyl carboxylate 2 in fairly good yield (90%). Further the compound 2 on treatment with hydrazine hydrate afforded compound 3 with excellent yield ( 95%). Thus compounds 4a-e have been obtained by direct cyclization of 3 with various fatty acids in the presence of POCl(3). The structures of all newly synthesized compounds were confirmed by IR, (1)H NMR, (13)C NMR and UPLC-Mass spectral data. Fluorescent experimental results revealed remarkable photoluminescence properties. Luminescent properties of all newly synthesized compounds were determined and observed that they exhibited strong blue-green fluorescent properties. The fluorescence spectral properties of compounds 4a-e are similar to each other and the Stoke's shift ranges from 54 to 59 nm. Both the absorption and fluorescence maxima of the benzocoumarin-oxadiazole compounds showed good bathochromic shift. |
| Doi | 10.3998/ark.5550190.0010.202 |
| Wosid | WOS:000266693600002 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Journal:ARKIVOC 1424-6376 |
| Is Public | Yes |
| Keyword | Fluorescence; benzocoumarins; benzocoumarin-3-ethylcarboxylate; benzocoumarin oxadiazolyls; phosphorous oxychloride; fatty acid oxadiazolyls |