Malaysian Journal of Analytical Sciences
Vol 17 No 3 (2013): 422 429
PREPARATION
AND ACTIVATION OF SPIROPYRAN-MEROCYANINE SYSTEM
(Penyediaan dan
Pengaktifan bagi Sistem Spiropiran-Merosianin)
Rumaisa
Nordin, Azwani Mat Lazim, Atisya Rohadi, Siti
Aishah Hasbullah*
School
of Chemical Sciences and Food Technology,
Faculty
of Science and Technology
Universiti
Kebangsaan Malaysia, 43600 Bangi
*Corresponding author:
aishah80@ukm.my
Abstract
A
benzospiropyran derivative has been prepared by the condensation of the precursor,
methylene indoline derivative with 2,3-dihydroxylbenzaldehye in 1:1 mole ratio.
The product, spiro [2H-1-benzopyran-2, 2-(8-hydroxy-1, 3,
3-trimethylindoline)] was able to undergo molecular rearrangement when exposed
to UV light, producing an open form merocyanine. Both opened (MC) and closed
form (SP) of benzospiropyran were characterized and distinguished by NMR
spectroscopy, ATR Infrared and UV-vis absorption. In addition, complexation of
metal ions with benzospiropyran in ethanol solution gives rise to colour
changes that are visible to the naked eye. Hence, hypsochromic shift in the
absorption bands were observed due to the metal ion binding (MC-M).
Keywords:
benzospiropyran, photochromic, merocyanine and hypsochromic shift
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