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A quinoline based Schiff-base compound as pH sensor

机译：一种基于喹啉的席夫碱化合物作为pH传感器

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摘要

A new Schiff-base compound, 1,4-bis-(quinolin-6-ylimino methyl) benzene (BQB), has been synthesized by the reaction between terephthaldehyde and 6-aminoquinoline (1 : 2 ratio) and characterized by elemental analysis and different spectroscopic methods. The Schiff-base compound, designated as BQB, undergoes protonation in acidic medium and has been designated as PBQB. PBQB shows emission intensity at 550 nm at low pH and with the increase in pH, the intensity of the peak at 550 nm decreases with simultaneous shift of the emission band to 453 nm. The intensity of the peak at 453 nm increases as pH of the medium is raised and the phenomenon is found to be reversible. Reversibility of fluorescence intensity of BQB with pH shows that the system is stable in both basic and acidic media. Absorption spectrum of the compound shows band at 380 nm with a strong shoulder at 402 nm in low pH which changes to 344 nm at higher pH region. Naked eye detection of colour change at different pH regions is possible using the probe. Position of absorption band of BQB is changed in acidic medium due to protonation of the ring nitrogen atom present in it as reflected by theoretical studies. We have applied our probe to detect the pH region of river water.
机译：对苯二甲醛与6-氨基喹啉（1：2比例）反应合成了一种新的席夫碱化合物1,4-双-（喹啉-6-ylimino甲基）苯（BQB），并通过元素分析和不同的光谱方法。席夫碱化合物（称为BQB）在酸性介质中进行质子化，并称为PBQB。 PBQB在低pH下显示550 nm处的发射强度，并且随着pH的增加，在550 nm处的峰强度随着发射带同时移至453 nm而降低。随着介质pH的升高，在453 nm处的峰强度增加，并且发现该现象是可逆的。 BQB的荧光强度与pH值可逆，表明该系统在碱性和酸性介质中均稳定。化合物的吸收光谱显示，在低pH下380 nm处的谱带在402 nm处具有较强的肩峰，在高pH区域时变为344 nm。使用该探头可以裸眼检测不同pH区域的颜色变化。如理论研究所反映的那样，由于酸性介质中BQB吸收带的位置发生变化，这是因为其中存在的环氮原子的质子化。我们已将我们的探针应用于检测河水的pH值区域。

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