Squarylium cyanine chemical sensor used for Fe<3+> detection and preparation method thereof
A chemical sensor, squaraine technology, applied in chemical instruments and methods, carboxylate preparation, organic compound preparation, etc., to achieve the effects of easy control of reaction conditions, good promotion prospects, excellent optical properties and photostability
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Embodiment 1
[0026] (1) Preparation of intermediate 1,3,5-trihydroxy-2,4-di(p-carboxybenzyl)benzene
[0027] Weigh 0.4328g (0.0034mol) of phloroglucinol and 1.1598g (0.0070mol) of 4-(chloromethyl)benzoic acid, and add 20ml of absolute ethanol into a two-necked flask, and at the same time add 0.1083g of KI, Make the mass ratio of potassium iodide to phloroglucinol 0.25:1, heat, reflux, and stir with a constant temperature heating magnetic stirrer for 20 hours, and the obtained product is a yellow liquid. After the solution was cooled to room temperature, there was a small amount of insoluble solids in the flask. After filtration, the obtained filtrate was rotary evaporated in a rotary evaporator to finally obtain a yellow viscous liquid, which was used for the next reaction.
[0028] (2) Preparation of symmetrical 2,4,6-trihydroxy-3,5-di(p-carboxybenzyl)benzene) squaraine dye
[0029] Mix 1.4970 g (0.0038 mol) of the intermediate obtained in the previous step with 0.2138 g (0.0019 mol) of ...
Embodiment 2
[0031] (1) Preparation of intermediate 1,3,5-trihydroxy-2,4-di(p-carboxybenzyl)benzene
[0032] Weigh 0.6493g (0.0051mol) of phloroglucinol, 1.7392g (0.010mol) of 4-(chloromethyl)benzoic acid, 30ml of absolute ethanol, add them to a two-necked flask, and add 0.3247g of KI at the same time, Make the mass ratio of potassium iodide to phloroglucinol 0.5:1, heat, reflux, and stir with a constant temperature heating magnetic stirrer for 24 hours, and the obtained product is a yellow liquid. After the solution was cooled to room temperature, there was a small amount of insoluble solids in the flask. After filtration, the obtained filtrate was rotary evaporated in a rotary evaporator to finally obtain a yellow viscous liquid, which was used for the next reaction.
[0033] (2) Preparation of symmetrical 2,4,6-trihydroxy-3,5-di(p-carboxybenzyl)benzene) squaraine dye
[0034] Mix 2.3640g (0.006mol) of the intermediate obtained in the previous step with 0.3421g (0.003mol) of squaraine, ...
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