Effect of complexation with lanthanide metal ions on the photochromism of (1,3,3‐trimethyl‐5^′‐hydroxy‐6^′‐formyl‐ indoline‐spiro2,2′‐[2h]chromene) in different media

Abstract

Complexation of lanthanide ions {Ln(III) ions [Tb(III), Eu(III), or Sm(III)]} with the spiropyran-derived merocyanine obtained in dark and under steady irradiation of indoline spiropyran (1,3,3-trimethyl-5′-hydroxy-6′-formyl-indoline-spiro-2,2′-[2H]chromene) induces a noticeable hypsochromic shift of about 10–110 nm of its visible absorption band concomitant with hypochromic effect and influences its thermal bleaching in the dark. The effect of lanthanide ions and medium on photochromic, spectral-and-kinetic, and luminescence properties of the spiropyran and its complexes in solution and polymer matrix of polymethylmethacrylate (PMMA) is studied. Efficient energy transfer from the spiropyran moiety results in efficient typical luminescence from the Ln(III) ion that becomes more pronounced in polar nonalcoholic solvents and PMMA solid matrix. Moreover, luminescence mappings for pattern recognition analysis have been obtained from which the nature of the solvent and/or the ligand is clearly identified.

Useful Spectrokinetic Methods for the Investigation of Photochromic and Thermo-Photochromic Spiropyrans

“…Dozens of approaches have been proposed thus far for the various AB reaction cases [8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44]. These methods met with varying success.…”

Spectrofluorometric Determination of Alpha Fetoprotein in different serum samples of Liver Cancer by Tb-acetyl acetone complex embedded in Polymethylmethacrylate optical sensor

“…After the addition of ACAC to the Tb 3+ ion in the PMMA matrix, the characteristic peaks of the Tb 3+ ion ( 5 D 4 → 7 F 6 , 5 D 4 → 7 F 5 , and 5 D 4 →F 4 ) appeared (see curves 2 and 1 in Fig. 2) [27][28][29][30][31]. Comparing curve 4 with curves 2 and 3 in Fig.…”

Thermodynamic and kinetic analysis of metal ion complexation by photochromic spiropyrans

“…The influence of complexation with lanthanide ions on the photochromism of 6´ formyl 5´ hydroxy spiro[1,3,3 trimethylindoline 2,2´ [2H] chromene] in different media was studied. 22 It was found that the efficient energy transfer from the spiropyran fragment leads to a typical luminescence of the Ln 3+ ion, which becomes brighter in polar alcohol free solvents and solid matrices of poly(methyl methacrylate).…”