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Light-induced self-assemblies suitable for photodimerization and their light-induced [2+2] cycloaddition: Light as a control factor of crystal growth

Title
Light-induced self-assemblies suitable for photodimerization and their light-induced [2+2] cycloaddition: Light as a control factor of crystal growth
Authors
Poong J.I.Koo H.G.Park H.M.Jang S.P.Lee Y.J.Kim C.Kim S.-J.Kim Y.
Ewha Authors
김성진김영미
SCOPUS Author ID
김성진scopus; 김영미scopus
Issue Date
2011
Journal Title
Inorganica Chimica Acta
ISSN
0020-1693JCR Link
Citation
vol. 376, no. 1, pp. 605 - 611
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The reaction of Cd(NO3)2 and CF3COONH 4 with bpe (trans-1,2-(bis(4-pyridyl)ethene)) ligands was investigated for a light-induced solid-state [2+2] cycloaddition reaction. The three structures (1 [Cd(bpe)2(CF3COO)2] n, 2 [Cd(bpe)2(NO3)2]n, and 3 [Cd(NO3)(μ-NO3)(H2O)(bpe) 1.5]n) formed in light while only compound 1 (or 1-dark) was formed in the dark. All three compounds were completely transformed to the final [2+2] cycloaddition products containing rctt-tetrakis(4-pyridyl) cyclobutane (rctt-tpcb; rctt means regional cis, trans, and trans of the four pyridyl groups attached to the cyclobutane ring) in solution under a natural light after 4 weeks. Among the final products, only one 3-D structure (4 [{Cd(rctt-tpcb)2(NO3)2}{Cd(rctt-tpcb) 2(OH)2}]n) with a good crystallinity was determined by the X-ray diffraction technique. These observations were also in line with the spectroscopic results such as 1H NMR. Meanwhile, 3 was also prepared separately and exposed to natural light. X-ray and NMR studies showed that 3 was completely transformed to 4 containing rctt-tpcb by a light-induced cycloaddition reaction for the 4 weeks. The reaction progress was further monitored by fluorescent spectroscopy. 1-dark also underwent the solid-state [2+2] cycloaddition under the natural light over four weeks. © 2011 Elsevier B.V. All rights reserved.
DOI
10.1016/j.ica.2011.07.042
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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