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• W2107489977 startingPage "541" @default.
• W2107489977 abstract "Porphyrin(Por)–spiropyran(SP) hybrid compounds, including Por–SP dyad, Por–SP2 triad, and Por–SP4 pentad, were prepared and characterized by 1H NMR, MALDI-TOF MS and UV–Vis spectroscopies. Upon 350 nm UV irradiation of Por–SPn (n = 1, 2, 4) in dichloromethane, unusual red-shifted absorption spectra were observed with the colour change from pink into green. Probably due to the protonation of core nitrogens in porphyrin ring, their absorption maxima in dichloromethane were shifted from 418 (Soret band), 515, 550, 590, 645 (four Q bands) nm into 450 and 665 nm. Also, fluorescence maxima were also shifted from 650 and 715 nm to 692 nm. In the other hands, upon irradiation with 350 nm UV light in THF, the colour changed from pink into violet and absorption band at 590 nm increased and the fluorescence spectra showed the decrease of 650 and 715 nm bands and increase of 600–640 nm band, due to the normal ring-opening reaction of spiropyran moiety into merocyanine. In the dark, original absorption and fluorescence spectra were recovered very slowly in dichloromethane, but quickly in THF. The reversible photochromic reactions of Por–SPn (n = 1, 2, 4) in dichloromethane and THF were investigated by observing absorption and fluorescence spectral changes during UV irradiation or standing in the dark." @default.
• W2107489977 created "2016-06-24" @default.
• W2107489977 creator A5007262375 @default.
• W2107489977 creator A5062200215 @default.
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• W2107489977 date "2014-01-01" @default.
• W2107489977 modified "2023-10-16" @default.
• W2107489977 title "Synthesis and solvent-dependent photochromic reactions of porphyrin–spiropyran hybrid compounds" @default.
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• W2107489977 doi "https://doi.org/10.1016/j.saa.2013.08.005" @default.
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